v3.25.1
Shareholder Report
 12 Months Ended
Mar. 31, 2025
USD ($)
Holding
Shareholder Report [Line Items]  
Document Type N-CSR
Amendment Flag false
Registrant Name MULTI-SELECT SECURITIES FUND FOR PUERTO RICO RESIDENTS
Entity Central Index Key 0001852344
Entity Investment Company Type N-1A
Document Period End Date Mar. 31, 2025
International Portfolio I - Class A  
Shareholder Report [Line Items]  
Fund Name International Portfolio I
Class Name Class A
Trading Symbol PRANX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the International Portfolio I (the “Portfolio”) of the Multi-Select Securities Fund for Puerto Rico Residents (the “Fund”) for the period from April 1, 2024, to March 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
www.ubs.com/prfunds
or by contacting us at
787-250-3600.
Additional Information Phone Number 787-250-3600
Additional Information Website www.ubs.com/prfunds
Expenses [Text Block]
       
What were the Portfolio costs for the last year?
 
Annual Fund Operating Expenses
 
(based on a hypothetical $10,000 investment)
 
     
Class  
Name
   
 
Cost of a $10,000 

investment
 

 
   
 
Cost paid as a percentage of

a $10,000 investment
 

 
   Class A      $670        1.76%  
        
                          
Expenses Paid, Amount $ 670
Expense Ratio, Percent 1.76%
Factors Affecting Performance [Text Block]
How did the Portfolio perform last year and what affected its performance?
The equity portion of the Portfolio returned 10.2% gross of fees for the year ended March 31, 2025. The return was almost exclusively a
by-product
of positive stock selection. After a long period of underperformance versus the U.S. markets, international equities have outperformed thus far in 2025.
The performance of the Healthcare sector was a notable highlight in the portfolio, offset by an overweight to the Energy sector and a challenging performance for the Consumer Staples sector. A boost to the performance of the portfolio was the increase in the price of gold.
Two of the best performing stocks in the portfolio were pharmaceuticals UCB SA, and Roche Holding AG. Another top performer, Agnico Eagle Mines, was boosted by the increase in the price of gold. The two top underperforming stocks were Diageo PLC, a spirit producer, and Barry Callebut, a chocolate producer.
The Puerto Rico securities portion of the Portfolio continued to be invested in cash and futures. This portion of the Portfolio generated interest from the cash investment and there was a positive return from the investment in futures contracts. The return of the Puerto Rico securities portion of the Portfolio underperformed the equity portion of the Portfolio.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block] LOGO
Average Annual Return [Table Text Block]
   
  Average Annual Total Returns  
as of March 31, 2025
    
1-Year
   
5-Year
   
10-Year
International Portfolio I, Class A - No Load
  
6.61
%		    8.07%    0.55%
International Portfolio I, Class A - Load
   1.25%    6.97%    0.04%
MSCI EAFE Net Index
   4.88%    11.77%    5.40%
No Deduction of Taxes [Text Block] Performance calculations do not reflect any deduction of taxes that a shareholder may have to pay on Fund distributions.
Net Assets $ 2,537,131
Holdings Count | Holding 47
Advisory Fees Paid, Amount $ 24,952
Investment Company, Portfolio Turnover 37.63%
Additional Fund Statistics [Text Block]
Key Portfolio Statistics
   
 
 
 
PORTFOLIO STATISTICS
   
 
 
 
Total Net Assets
      $2,537,131    
# of Portfolio Holdings
      47    
Portfolio Turnover Rate
      37.63%    
Total Advisory Fees Paid
      $24,952     
Holdings [Text Block]
Top 5 Sectors (% of Net Assets)
LOGO
 
Portfolio Holdings Summaries
The equity portion of the Portfolio consists 100% of equity securities.
Top 5 Holdings (% of Net Assets)
   
 
 
 
ING Group N.V.
      3.16%  
Barclays PLC
      3.1%  
Sony Group Corp.
      3.1%  
KBC Group N.V.
      2.7%  
Roche Holding AG
      2.5%  
Largest Holdings [Text Block]
Top 5 Holdings (% of Net Assets)
   
 
 
 
ING Group N.V.
      3.16%  
Barclays PLC
      3.1%  
Sony Group Corp.
      3.1%  
KBC Group N.V.
      2.7%  
Roche Holding AG
      2.5%  
Large Cap Core Portfolio I - Class A  
Shareholder Report [Line Items]  
Fund Name Large Cap Core Portfolio I
Class Name Class A
Trading Symbol PRAOX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Large Cap Core Portfolio I (the “Portfolio”) of the Multi-Select Securities Fund for Puerto Rico Residents (the “Fund”) for the period from April 1, 2024, to March 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
www.ubs.com/prfunds
or by contacting us at
787-250-3600.
Additional Information Phone Number 787-250-3600
Additional Information Website www.ubs.com/prfunds
Expenses [Text Block]
       
What were the Portfolio costs for the last year?
 
Annual Fund Operating Expenses
 
(based on a hypothetical $10,000 investment)
 
     
Class  
Name
   
 
Cost of a $10,000 

investment
 

 
   
 
Cost paid as a percentage of

a $10,000 investment
 

 
   Class A      $669        1.75%  
        
                          
Expenses Paid, Amount $ 669
Expense Ratio, Percent 1.75%
Factors Affecting Performance [Text Block]
How did the Portfolio perform last year and what affected its performance?
The equity portion of the Portfolio returned 7.19% gross of fees for the year ended March 31, 2025. The underperformance was mostly the result of sector allocation although stock selection contributed.
The top three sectors detracting from relative performance were Consumer Discretionary, Financials and an underweight to Utilities. The top three contributing sectors to relative performance were Real Communication Services, Health Care and Consumer Staples.
With respect to stock selection, the worst performing stocks were Salesforce, Inc., Micron Technology, Inc., Visa, Inc., United Rental and ConocoPhillips. The top relative performing stocks were
T-Mobile
US, Inc., Boston Scientific Co., Walmart, Inc. and RTX Corporation.
The Puerto Rico securities portion of the Portfolio continued to be invested in cash and futures. This portion of the Portfolio generated interest from the cash investment and there was a positive return from the investment in futures contracts. The return of the Puerto Rico securities portion of the Portfolio underperformed the equity portion of the Portfolio.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block] LOGO
Average Annual Return [Table Text Block]
   
  Average Annual Total Returns  
as of March 31, 2025
    
1-Year
   
5-Year
   
10-Year
 Large Cap Core Portfolio I, Class A - No Load
   4.64%    14.89%    9.82%
 Large Cap Core Portfolio I, Class A - Load
   -0.60%    13.72%    9.26%
 S&P 500 Total Return Index
   8.25%    18.59%    12.50%
No Deduction of Taxes [Text Block] Performance calculations do not reflect any deduction of taxes that a shareholder may have to pay on Fund distributions.
Net Assets $ 4,327,508
Holdings Count | Holding 46
Advisory Fees Paid, Amount $ 75,337
Investment Company, Portfolio Turnover 50.27%
Additional Fund Statistics [Text Block]
 Key Portfolio Statistics
   
 
 
 
 PORTFOLIO STATISTICS
   
 
 
 
 Total Net Assets
    $ 4,327,508     
 # of Portfolio Holdings
      46     
 Portfolio Turnover Rate
      50.27%     
 Total Advisory Fees Paid
      $75,337     
Holdings [Text Block]
Top 5 Sectors (% of Net Assets)
LOGO
 
Portfolio Holdings Summaries
The equity portion of the Portfolio consists 100% of equity securities.
Top 5 Holdings (% of Net Assets)
   
 
 
 
Apple, Inc.
      7.00%  
Microsoft Corp.
      5.7%  
NVIDIA Corp.
      5.1%  
Amazon.com, Inc.
      4.3%  
Alphabet, Inc. Class A
      3.8%  
Largest Holdings [Text Block]
Top 5 Holdings (% of Net Assets)
   
 
 
 
Apple, Inc.
      7.00%  
Microsoft Corp.
      5.7%  
NVIDIA Corp.
      5.1%  
Amazon.com, Inc.
      4.3%  
Alphabet, Inc. Class A
      3.8%  
Large Cap Core Portfolio I - Class L  
Shareholder Report [Line Items]  
Fund Name Large Cap Core Portfolio I
Class Name Class L
Trading Symbol PRBKX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Large Cap Core Portfolio I (the “Portfolio”) of the Multi-Select Securities Fund for Puerto Rico Residents (the “Fund”) for the period from April 1, 2024, to March 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
www.ubs.com/prfunds
or by contacting us at
787-250-3600.
Additional Information Phone Number 787-250-3600
Additional Information Website www.ubs.com/prfunds
Expenses [Text Block]
       
What were the Portfolio costs for the last year?
 
Annual Fund Operating Expenses
 
(based on a hypothetical $10,000 investment)
 
     
Class  
Name
   
 
Cost of a $10,000 

investment
 

 
   
 
Cost paid as a percentage of

a $10,000 investment
 

 
   Class L      $178         1.75%  
        
                          
Expenses Paid, Amount $ 178
Expense Ratio, Percent 1.75%
Factors Affecting Performance [Text Block]
How did the Portfolio perform last year and what affected its performance?
The equity portion of the Portfolio returned 7.19% gross of fees for the year ended March 31, 2025. The underperformance was mostly the result of sector allocation although stock selection contributed.
The top three sectors detracting from relative performance were Consumer Discretionary, Financials and an underweight to Utilities. The top three contributing sectors to relative performance were Real Communication Services, Health Care and Consumer Staples.
With respect to stock selection, the worst performing stocks were Salesforce, Inc., Micron Technology, Inc., Visa, Inc., United Rental and ConocoPhillips. The top relative performing stocks were
T-Mobile
US, Inc., Boston Scientific Co., Walmart, Inc. and RTX Corporation.
The Puerto Rico securities portion of the Portfolio continued to be invested in cash and futures. This portion of the Portfolio generated interest from the cash investment and there was a positive return from the investment in futures contracts. The return of the Puerto Rico securities portion of the Portfolio underperformed the equity portion of the Portfolio.
Line Graph [Table Text Block] LOGO
Average Annual Return [Table Text Block]
   
  Average Annual Total Returns  
as of March 31, 2025
    
1-Year
   
5-Year
   
10-Year
 Large Cap Core Portfolio I, Class L - No Load
   4.62%    14.68%    9.51%
 S&P 500 Total Return Index
   8.25%    18.59%    12.50%
Net Assets $ 2,436,198
Holdings Count | Holding 46
Advisory Fees Paid, Amount $ 75,337
Investment Company, Portfolio Turnover 50.27%
Additional Fund Statistics [Text Block]
Key Portfolio Statistics
   
 
 
 
PORTFOLIO STATISTICS
 
   
 
 
 
Total Net Assets
    $ 2,436,198    
# of Portfolio Holdings
      46    
Portfolio Turnover Rate
      50.27%    
Total Advisory Fees Paid
      $75,337    
Holdings [Text Block]
Top 5 Sectors (% of Net Assets)
 
LOGO
 
Portfolio Holdings Summaries
The equity portion of the Portfolio consists 100% of equity securities
Top 5 Holdings (% of Net Assets)
   
 
 
 
Apple, Inc.
     
7.00 		%
Microsoft Corp.
      5.7 % 
NVIDIA Corp.
      5.1 % 
Amazon.com, Inc.
      4.3 % 
Alphabet, Inc. Class A
      3.8 % 
Largest Holdings [Text Block]
Top 5 Holdings (% of Net Assets)
   
 
 
 
Apple, Inc.
     
7.00 		%
Microsoft Corp.
      5.7 % 
NVIDIA Corp.
      5.1 % 
Amazon.com, Inc.
      4.3 % 
Alphabet, Inc. Class A
      3.8 % 
Large Cap Growth Portfolio I - Class A  
Shareholder Report [Line Items]  
Fund Name Large Cap Growth Portfolio I
Class Name Class A
Trading Symbol PRAQX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Large Cap Growth Portfolio I (the “Portfolio”) of the Multi-Select Securities Fund for Puerto Rico Residents (the “Fund”) for the period from April 1, 2024, to March 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
www.ubs.com/prfunds
or by contacting us at
787-250-3600.
Additional Information Phone Number 787-250-3600
Additional Information Website www.ubs.com/prfunds
Expenses [Text Block]
       
What were the Portfolio costs for the last year?
 
Annual Fund Operating Expenses
 
(based on a hypothetical $10,000 investment)
 
     
Class  
Name
   
 
Cost of a $10,000 

investment
 

 
   
 
Cost paid as a percentage of

a $10,000 investment
 

 
   Class A      $670        1.76%  
        
                          
Expenses Paid, Amount $ 670
Expense Ratio, Percent 1.76%
Factors Affecting Performance [Text Block]
How did the Portfolio perform last year and what affected its performance?
The equity portion of the Portfolio returned 6.08% gross of fees for the year ended March 31, 2025. Markets soared following the U.S. Presidential election results in the fourth quarter of 2024, yet volatility spiked as the calendar turned to 2025. There is a lot riding on Artificial Intelligence (“AI”) as the future growth and profitability engine of the U.S. stock market.
Overall, the portfolio generated strong returns, yet it trailed the benchmark. The spike in volatility due to concerns of slowing AI investment and a mix of economic concerns and policy developments weighed on investor sentiment. Additionally, investors were focused on pending tariff news. The largest contributing sectors to relative performance were Services, Healthcare and Financials. The largest detractors were Information Technology, Energy and Utilities sectors.
The Puerto Rico securities
portion
of the Portfolio continued to be invested in cash and futures. This portion of the Portfolio generated interest from the cash investment and there was a
positive
return from the investment in futures contracts. The return of the Puerto Rico securities portion of the Portfolio underperformed the equity portion of the Portfolio.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block] LOGO
Average Annual Return [Table Text Block]
   
  Average Annual Total Returns  
as of March 31, 2025
    
1-Year
   
5-Year
   
10-Year
 
Large Cap Growth Portfolio I, Class A - No Load
   3.69%    15.56%    12.30%
 Large Cap Growth Portfolio I, Class A - Load
   -1.50%    14.38%    11.73%
 Russell 1000 Growth Total Return Index
   7.72%    20.08%    15.12%
No Deduction of Taxes [Text Block] Performance calculations do not reflect any deduction of taxes that a shareholder may have to pay on Fund distributions.
Net Assets $ 5,780,956
Holdings Count | Holding 45
Advisory Fees Paid, Amount $ 89,143
Investment Company, Portfolio Turnover 72.43%
Additional Fund Statistics [Text Block]
Key Portfolio Statistics
   
 
 
 
PORTFOLIO STATISTICS
   
 
 
 
Total Net Assets
      $5,780,956    
# of Portfolio Holdings
      45    
Portfolio
Turnover
Rate
      72.43%    
Total Advisory Fees Paid
      $89,143     
Holdings [Text Block]
Top 5 Sectors (% of Net Assets)
LOGO
Portfolio Holdings Summaries
The equity portion of the Portfolio consists 100% of equity securities.
Top 5 Holdings (% of Net Assets)
   
 
 
 
Microsoft, Corp.
      7.98%  
Amazon.com, Inc.
      6.8%  
NVIDIA Corp.
      6.2%  
Apple, Inc.
      4.9%  
Meta Platforms, Inc.
      4.5%  
Largest Holdings [Text Block]
Top 5 Holdings (% of Net Assets)
   
 
 
 
Microsoft, Corp.
      7.98%  
Amazon.com, Inc.
      6.8%  
NVIDIA Corp.
      6.2%  
Apple, Inc.
      4.9%  
Meta Platforms, Inc.
      4.5%  
Large Cap Growth Portfolio I - Class L  
Shareholder Report [Line Items]  
Fund Name Large Cap Growth Portfolio I
Class Name Class L
Trading Symbol PRBNX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Large Cap Growth Portfolio I (the “Portfolio”) of the Multi-Select Securities Fund for Puerto Rico Residents (the “Fund”) for the period from April 1, 2024, to March 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
www.ubs.com/prfunds
or by contacting us at
787-250-3600.
Additional Information Phone Number 787-250-3600
Additional Information Website www.ubs.com/prfunds
Expenses [Text Block]
       
What were the Portfolio costs for the last year?
 
Annual Fund Operating Expenses
 
(based on a hypothetical $10,000 investment)
 
     
Class  
Name
   
 
Cost of a $10,000 

investment
 

 
   
 
Cost paid as a percentage of

a $10,000 investment
 

 
   Class L      $179        1.76%  
        
                          
Expenses Paid, Amount $ 179
Expense Ratio, Percent 1.76%
Factors Affecting Performance [Text Block]
How did the Portfolio perform last year and what affected its performance?
The equity portion of the Portfolio returned 6.08% gross of fees for the year ended March 31, 2025. Markets soared following the U.S. Presidential election results in the fourth quarter of 2024, yet volatility spiked as the calendar turned to 2025. There is a lot riding on Artificial Intelligence (“AI”) as the future growth and profitability engine of the U.S. stock market.
Overall, the portfolio generated strong returns, yet it trailed the benchmark. The spike in volatility due to concerns of slowing AI investment and a mix of economic concerns and policy developments weighed on investor sentiment. Additionally, investors were focused on pending tariff news. The largest contributing sectors to relative performance were Services, Healthcare and Financials. The largest detractors were Information Technology, Energy and Utilities sectors.
The Puerto Rico securities portion of the Portfolio continued to be invested in cash and futures. This portion of the Portfolio generated interest from the cash investment and there was a positive return from the
investment
in futures contracts. The return of the Puerto Rico securities portion of the Portfolio underperformed the equity portion of the Portfolio.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block] LOGO
Average Annual Return [Table Text Block]
   
  Average Annual Total Returns  
as of March 31, 2025
    
1-Year
   
5-Year
   
10-Year
 Large Cap Growth Portfolio I, Class L - No Load
   3.68%    15.36%    11.98%
 Russell 1000 Growth Total Return Index
   7.72%    20.08%    15.12%
No Deduction of Taxes [Text Block] Performance calculations do not reflect any deduction of taxes that a shareholder may have to pay on Fund distributions.
Net Assets $ 2,535,627
Holdings Count | Holding 45
Advisory Fees Paid, Amount $ 89,143
Investment Company, Portfolio Turnover 72.43%
Additional Fund Statistics [Text Block]
 Key Portfolio Statistics
   
 
 
 
 PORTFOLIO STATISTICS
   
 
 
 
 Total Net Assets
    $ 2,535,627    
 # of Portfolio Holdings
      45    
 Portfolio Turnover Rate
      72.43%    
 Total Advisory Fees Paid
      $89,143    
Holdings [Text Block]
Top 5 Sectors (% of Net Assets)
LOGO
Portfolio Holdings Summaries
The equity portion of the
Portfolio
consists 100% of equity securities.
 
Top 5 Holdings (% of Net Assets)
   
 
 
 
Microsoft, Corp.
      7.98%  
Amazon.com, Inc.
      6.8%  
NVIDIA Corp.
      6.2%  
Apple, Inc.
      4.9%  
Meta Platforms, Inc.
      4.5%  
Largest Holdings [Text Block]
 
Top 5 Holdings (% of Net Assets)
   
 
 
 
Microsoft, Corp.
      7.98%  
Amazon.com, Inc.
      6.8%  
NVIDIA Corp.
      6.2%  
Apple, Inc.
      4.9%  
Meta Platforms, Inc.
      4.5%  
Large Cap Value Portfolio - Class A  
Shareholder Report [Line Items]  
Fund Name Large Cap Value Portfolio I
Class Name Class A
Trading Symbol PRAUX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Large Cap Value Portfolio I (the “Portfolio”) of the Multi-Select Securities Fund for Puerto Rico Residents (the “Fund”) for the period from April 1, 2024, to March 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
www.ubs.com/prfunds
or by contacting us at
787-250-3600.
Additional Information Phone Number 787-250-3600
Additional Information Website www.ubs.com/prfunds
Expenses [Text Block]
What were the Portfolio costs for the last year?
 
Annual Fund Operating Expenses
  
 
   
 Class
 Name
   
Cost of a $10,000
investment
   
Cost paid as a percentage
of a $10,000 investment
    Class A    $
670
   
1.76
%
(based on a hypothetical $10,000 investment)
 
                   
Expenses Paid, Amount $ 670
Expense Ratio, Percent 1.76%
Factors Affecting Performance [Text Block]
How did the Portfolio perform last year and what affected its performance?
The equity portion of the Portfolio returned 10.9% gross of fees for the year ended March 31, 2025. While growth, volatility and momentum were a factor for much of 2024, the shift of quality and yield factors in the third quarter of 2024 and the first quarter of 2025 contributed to relative performance.
Overall sector allocation detracted from relative performance. An underweight in Health Care and overweight in Consumer Staples contributed to relative performance was offset by the negative impact of an overweight in Technology and an underweight in Utilities. Stock selection was a tailwind to relative performance. The best performing stocks based on relative performance versus the benchmark were Philip Morris International, Inc., The Progressive Corporation, and despite volatility, Apple, Inc. The worst performing positions based on relative performance were Merck, Diageo PLC, and Microsoft Corp.
The Puerto Rico securities portion of the Portfolio continued to be invested in cash and futures. This portion of the Portfolio generated interest from the cash investment and there was a positive return from the investment in
futures
contracts. The return of the Puerto Rico securities portion of the Portfolio underperformed the equity portion of the Portfolio.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block] LOGO
Average Annual Return [Table Text Block]
    
  Average Annual Total Returns  
as of March 31, 2025
     
1-Year
   
5-Year
   
10-Year
Large Cap Value Portfolio I, Class A - No Load    7.07%    11.44%    6.97%
Large Cap Value Portfolio I, Class A - Load    1.70%    10.31%    6.42%
Russell 1000 Value Total Return Index    7.18%    16.15%    8.79%
No Deduction of Taxes [Text Block] Performance calculations do not reflect any deduction of taxes that a shareholder may have to pay on Fund distributions.
Net Assets $ 4,374,436
Holdings Count | Holding 30
Advisory Fees Paid, Amount $ 62,904
Investment Company, Portfolio Turnover 8.26%
Additional Fund Statistics [Text Block]
 
 Key Portfolio Statistics
   
 
 
 
 PORTFOLIO STATISTICS
   
 
 
 
 Total Net Assets
    $ 4,374,436    
 # of Portfolio Holdings
     30    
 Portfolio Turnover Rate
      8.26%    
 Total Advisory Fees Paid
    $ 62,904    
Holdings [Text Block]
Top 5 Sectors (% of Net
Assets
)
LOGO
Portfolio
Holdings
Summaries
The equity portion of the Portfolio consists 100% of equity securities.
Top 5 Holdings (% of Net Assets)
   
 
 
 
Phillip Morris International, Inc.
      4.66%  
Berkshire Hathaway, Inc.
      4.5%  
Apple, Inc.
      4.2%  
The Progressive Corporation
      4.0%  
Air Products and Chemicals, Inc.
      3.8%  
Largest Holdings [Text Block]
Top 5 Holdings (% of Net Assets)
   
 
 
 
Phillip Morris International, Inc.
      4.66%  
Berkshire Hathaway, Inc.
      4.5%  
Apple, Inc.
      4.2%  
The Progressive Corporation
      4.0%  
Air Products and Chemicals, Inc.
      3.8%  
Large Cap Value Portfolio I - Class L  
Shareholder Report [Line Items]  
Fund Name Large Cap Value Portfolio I
Class Name Class L
Trading Symbol PRBOX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Large Cap Value Portfolio I (the “Portfolio”) of the Multi-Select Securities Fund for Puerto Rico Residents (the “Fund”) for the period from April 1, 2024, to March 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
www.ubs.com/prfunds
or by contacting us at
787-250-3600.
Additional Information Phone Number 787-250-3600
Additional Information Website www.ubs.com/prfunds
Expenses [Text Block]
       
What were the Portfolio costs for the last year?
     
Class  
Name
   
 
Cost of a $10,000 

investment
 

 
   
 
Cost paid as a percentage of

a $10,000 investment
 

 
   Class L      $179        1.76%  
Annual Fund Operating Expenses
         
(based on a hypothetical $10,000 investment)
 
                           
Expenses Paid, Amount $ 179
Expense Ratio, Percent 1.76%
Factors Affecting Performance [Text Block]
How did the Fund perform last year and what affected its performance?
The equity portion of the Portfolio returned 10.9% gross of fees for the year ended March 31, 2025. While growth, volatility and momentum were a factor for much of 2024, the shift of quality and yield factors in the third quarter of 2024 and the first quarter of 2025 contributed to relative performance.
Overall sector allocation detracted from relative performance. An underweight in Health Care and overweight in Consumer Staples contributed to relative performance was offset by the negative impact of an overweight in Technology and an underweight in Utilities. Stock selection was a tailwind to relative performance. The best performing stocks based on relative performance versus the benchmark were Philip Morris International, Inc., The Progressive Corporation, and despite volatility, Apple, Inc. The worst performing positions based on relative performance were Merck, Diageo PLC, and Microsoft Corp.
The Puerto Rico securities portion of the Portfolio continued to be invested in cash and futures. This portion of the Portfolio generated interest from the cash investment and there was a positive return from the investment in futures contracts. The return of the Puerto Rico securities portion of the Portfolio underperformed the equity portion of the Portfolio.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block]
LOGO
Average Annual Return [Table Text Block]
    
Average Annual Total Returns
    
as of March 31, 2025
    
 1-Year
       
  5-Year
        
 10-Year
 Large Cap Value Portfolio I, Class L - No Load
        7.07%                11.25%     
 
 
 
        6.67%
 Russell 1000 Value Total Return Index
        7.18%    
 
 
 
        16.15%     
 
 
 
        8.79%
No Deduction of Taxes [Text Block] Performance calculations do not reflect any deduction of taxes that a shareholder may have to pay on Fund distributions.
Net Assets $ 1,880,672
Holdings Count | Holding 30
Advisory Fees Paid, Amount $ 62,904
Investment Company, Portfolio Turnover 8.26%
Additional Fund Statistics [Text Block]
 
Key Portfolio Statistics
   
 
 
 
PORTFOLIO STATISTICS
 
   
 
 
 
Total Net Assets
      $1,880,672     
# of Portfolio Holdings
      30     
Portfolio Turnover Rate
      8.26%     
Total Advisory Fees Paid
      $62,904     
Holdings [Text Block]
Top 5 Sectors (% of
Net
Assets
)
LOGO
Portfolio
Holdings
Summaries
The equity portion of the Portfolio consists 100% of equity securities.
Top 5 Holdings (% of Net Assets)
   
 
 
 
Phillip Morris International, Inc.
      4.66 % 
Berkshire Hathaway, Inc.
      4.5 % 
Apple, Inc.
      4.2 % 
The Progressive Corporation
      4.0 % 
Air Products and Chemicals, Inc.
      3.8 % 
Largest Holdings [Text Block]
Top 5 Holdings (% of Net Assets)
   
 
 
 
Phillip Morris International, Inc.
      4.66 % 
Berkshire Hathaway, Inc.
      4.5 % 
Apple, Inc.
      4.2 % 
The Progressive Corporation
      4.0 % 
Air Products and Chemicals, Inc.
      3.8 % 
Mid Cap Core Portfolio I - Class A  
Shareholder Report [Line Items]  
Fund Name Mid Cap Core Portfolio I
Class Name Class A
Trading Symbol PRAVX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Mid Cap Core Portfolio I (the “Portfolio”) of the Multi-Select Securities Fund for Puerto Rico Residents (the “Fund”) for the period from April 1, 2024, to March 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
www.ubs.com/prfunds
or by contacting us at
787-250-3600.
Additional Information Phone Number 787-250-3600
Additional Information Website www.ubs.com/prfunds
Expenses [Text Block]
       
What were the Portfolio costs for the last year?
     
Class  
Name
   
 
Cost of a $10,000 

investment
 

 
   
 
Cost paid as a percentage of

a $10,000 investment
 

 
   Class A      $669        1.75%  
Annual Fund Operating Expenses
         
(based on a hypothetical $10,000 investment)
 
                           
Expenses Paid, Amount $ 669
Expense Ratio, Percent 1.75%
Factors Affecting Performance [Text Block]
How did the Portfolio perform last year and what affected its performance?
The equity portion of the Portfolio returned negative 5.9% gross of fees for the year ended March 31, 2025. Returns were weaker down the market cap spectrum and less exposure than the benchmark to growth and momentum factors was a headwind. The underperforming stocks remain in the portfolio reflecting our long-term conviction in the businesses.
Sector allocation detracted from relative performance. An overweight in Consumer Discretionary and an underweight in Health Care contributed to relative performance, offset by the negative impact of an overweight in Materials and underweight in Utilities.
Overall, stock selection detracted from relative performance. The worst performing stocks were Entegris, Inc. (semi-conductors), Bruker Corporation (life sciences) and Lamb Weston Holdings, Inc. (industrial). The best performing stocks based on relative performance were CBRE Group, Inc. (real estate services), M&T Bank Corp. (financial services) and AerCap Holdings N.V. (industrial).
The Puerto Rico securities portion of the Portfolio continued to be invested in cash and futures. This portion of the Portfolio
generated
interest from the cash investment and there was a positive return from the investment in futures contracts. The return of the Puerto Rico securities portion of the Portfolio underperformed the equity portion of the Portfolio.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block] LOGO
Average Annual Return [Table Text Block]
    
  Average Annual Total Returns  
as of March 31, 2025
     
1-Year
   
5-Year
   
10-Year
 Mid Cap Core Portfolio I, Class A - No Load
    -6.98%    13.80%    8.54%
 Mid Cap Core Portfolio I, Class A - Load
    -11.62%    12.65%    7.99%
 Russell Midcap Index
    2.59%    16.28%    8.82%
No Deduction of Taxes [Text Block] Performance calculations do not reflect any deduction of taxes that a shareholder may have to pay on Fund distributions.
Net Assets $ 2,842,395
Holdings Count | Holding 33
Advisory Fees Paid, Amount $ 48,132
Investment Company, Portfolio Turnover 10.39%
Additional Fund Statistics [Text Block]
 Key Portfolio Statistics
   
 
 
 
 PORTFOLIO STATISTICS
   
 
 
 
 Total Net Assets
    $ 2,842,395    
 # of Portfolio Holdings
      33    
 Portfolio Turnover Rate
      10.39%    
 Total Advisory Fees Paid
    $ 48,132    
Holdings [Text Block]
Top 5 Sectors (% of Net Assets)
LOGO
Portfolio Holdings Summaries
The equity portion of the Portfolio consists 100% of equity securities.
 Top 5 Holdings (% of Net Assets)
   
 
 
 
 Armstrong World Industries, Inc.
      3.84%  
 AerCap Holdings N.V.
      3.7%  
 Allison Transmission Holdings, Inc.
      3.3%  
 Entegris, Inc.
      3.3%  
 Fidelity National Information Services, Inc.
      3.0%  
Largest Holdings [Text Block]
 Top 5 Holdings (% of Net Assets)
   
 
 
 
 Armstrong World Industries, Inc.
      3.84%  
 AerCap Holdings N.V.
      3.7%  
 Allison Transmission Holdings, Inc.
      3.3%  
 Entegris, Inc.
      3.3%  
 Fidelity National Information Services, Inc.
      3.0%  
Mid Cap Core Portfolio I - Class L  
Shareholder Report [Line Items]  
Fund Name Mid Cap Core Portfolio I
Class Name Class L
Trading Symbol PRBPX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Mid Cap Core Portfolio I (the “Portfolio”) of the Multi-Select Securities Fund for Puerto Rico Residents (the “Fund”) for the period from April 1, 2024, to March 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
www.ubs.com/prfunds
or by contacting us at
787-250-3600.
Additional Information Phone Number 787-250-3600
Additional Information Website www.ubs.com/prfunds
Expenses [Text Block]
       
What were the Portfolio costs for the last year?
     
Class  
Name
   
 
Cost of a $10,000 

investment
 

 
   
 
Cost paid as a percentage of

a $10,000 investment
 

 
   Class L      $178        1.75%  
Annual Fund Operating Expenses
         
(based on a hypothetical $10,000 investment)
                           
Expenses Paid, Amount $ 178
Expense Ratio, Percent 1.75%
Factors Affecting Performance [Text Block]
How did the Fund perform last year and what affected its performance?
T The equity portion of the Portfolio returned negative 5.9% gross of fees for the year ended March 31, 2025. Returns were weaker down the market cap spectrum and less exposure than the benchmark to growth and momentum factors was a headwind. The underperforming stocks remain in the portfolio reflecting our long-term conviction in the businesses.
Sector allocation detracted from relative performance. An overweight in Consumer Discretionary and an underweight in Health Care contributed to relative performance, offset by the negative impact of an overweight in Materials and underweight in Utilities.
Overall, stock selection detracted from relative performance. The worst performing stocks were Entegris, Inc. (semi-conductors), Bruker Corporation (life sciences) and Lamb Weston Holdings, Inc. (industrial). The best performing stocks based on relative performance were CBRE Group, Inc. (real estate services), M&T Bank Corp. (financial services) and AerCap Holdings N.V. (industrial).
The Puerto Rico sec
ur
ities portion of the Portfolio continued to be invested in cash and futures. This portion of the Portfolio generated interest from the cash investment and there was a positive return from the investment in futures contracts. The return of the Puerto Rico securities portion of the Portfolio underperformed the equity portion of the Portfolio.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block] LOGO
Average Annual Return [Table Text Block]
    
  Average Annual Total Returns  
as of March 31, 2025
     
1-Year
   
5-Year
   
10-Year
Mid Cap Core Portfolio I, Class L - No Load
    -6.96%    13.60%    8.23%
Russell Midcap Index
    2.59%    16.28%    8.82%
No Deduction of Taxes [Text Block] Performance calculations do not reflect any deduction of taxes that a shareholder may have to pay on Fund distributions.
Net Assets $ 1,606,374
Holdings Count | Holding 33
Advisory Fees Paid, Amount $ 48,132
Investment Company, Portfolio Turnover 10.39%
Additional Fund Statistics [Text Block]
Key Portfolio Statistics
   
 
 
 
PORTFOLIO STATISTICS
   
 
 
 
Total Net Assets
    $ 1,606,374    
# of Portfolio Holdings
      33    
Portfolio Turnover Rate
      10.39%    
Total Advisory Fees Paid
    $ 48,132    
Holdings [Text Block]
Top 5 Sectors (% of
Net
Assets)
LOGO
Portfolio Holdings Summaries
The equity portion of the Portfolio
consists
100% of equity securities.
Top 5 Holdings (% of
N
et Assets)
   
 
 
 
Armstrong World Industries, Inc.
   
 
3.84%
 
AerCap Holdings N.V.
      3.7%  
Allison Transmission Holdings, Inc.
      3.3%  
Entegris, Inc.
      3.3%  
Fidelity National Information Services, Inc.
      3.0%  
Largest Holdings [Text Block]
Top 5 Holdings (% of
N
et Assets)
   
 
 
 
Armstrong World Industries, Inc.
   
 
3.84%
 
AerCap Holdings N.V.
      3.7%  
Allison Transmission Holdings, Inc.
      3.3%  
Entegris, Inc.
      3.3%  
Fidelity National Information Services, Inc.
      3.0%  
Small Cap Core Portfolio I - Class A  
Shareholder Report [Line Items]  
Fund Name Small Cap Core Portfolio I
Class Name Class A
Trading Symbol PRAWX
Annual or Semi-Annual Statement [Text Block] This annual shareholder report contains important information about the Small Cap Core Portfolio I (the “Portfolio”) of the Multi-Select Securities Fund for Puerto Rico Residents (the “Fund”) for the period from April 1, 2024, to March 31, 2025.
Shareholder Report Annual or Semi-Annual annual shareholder report
Additional Information [Text Block] You can find additional information about the Fund at
www.ubs.com/prfunds
or by contacting us at
787-250-3600.
Additional Information Phone Number 787-250-3600
Additional Information Website www.ubs.com/prfunds
Expenses [Text Block]
       
What were the Portfolio costs for the last year?
     
Class  
Name
   
 
Cost of a $10,000 

investment
 

 
   
 
Cost paid as a percentage of

a $10,000 investment
 

 
   Class A      $670        1.76%  
Annual Fund Operating Expenses
         
(based on a hypothetical $10,000 investment)
 
                           
Expenses Paid, Amount $ 670
Expense Ratio, Percent 1.76%
Factors Affecting Performance [Text Block]
How did the Portfolio perform last year and what affected its performance?
The equity portion of the Portfolio returned 0.8% gross of fees for the year ended March 31, 2025. The excess return was a function of both positive security selection as well as favorable sector allocations.
The two sectors providing the best performance were Consumer Discretionary and Healthcare. The top two detractors from performance were Real Estate and Technology.
Two of the best performing stocks in the portfolio were pharmaceutical companies, Exelixis, Inc. and Globus Medical, Inc. Sportradar Group AG, a sports technology company, and Frontdoor, Inc, the owner of the American Home Shield homeowner’s protection brand, also outperformed. Detractors from performance included Innovative Industrial Properties (Real Estate) and technology companies Diodes (semiconductors) and ASGN Incorporated (technology consulting).
The Puerto Rico s
ecur
ities portion of the Portfolio continued to be invested in cash and futures. This portion of the Portfolio generated interest from the cash investment and there was a positive return from the investment in futures contracts. The return of the Puerto Rico securities portion of the Portfolio underperformed the equity portion of the Portfolio.
Performance Past Does Not Indicate Future [Text] The Fund’s past performance is not a good predictor of the Fund’s future performance.
Line Graph [Table Text Block] LOGO
Average Annual Return [Table Text Block]
    
Average Annual Total Returns
    
as of March 31, 2025
    
1-Year
       
5-Year
        
10-Year
 Small Cap Core Portfolio I, Class A - No Load
        -3.00%                10.02%     
 
 
 
        5.62%
 Small Cap Core Portfolio I, Class A - Load
        -7.84%    
 
 
 
        8.90%     
 
 
 
        5.08%
 Russell 200 Index TR
        -4.01%    
 
 
 
        13.27%     
 
 
 
        6.30%
No Deduction of Taxes [Text Block] Performance calculations do not reflect any deduction of taxes that a shareholder may have to pay on Fund distributions.
Net Assets $ 4,448,769
Holdings Count | Holding 41
Advisory Fees Paid, Amount $ 28,330
Investment Company, Portfolio Turnover 6.33%
Additional Fund Statistics [Text Block]
 
Key Portfolio Statistics
   
 
 
 
PORTFOLIO STATISTICS
 
   
 
 
 
Total Net Assets
      $4,448,769     
# of Portfolio Holdings
      41     
Portfolio Turnover Rate
      6.33%     
Total Advisory Fees Paid
      $28,330     
Holdings [Text Block]
Top 5 Sectors (% of Net Assets)
 
LOGO
Portfolio Holdings Summaries
The equity portion of the Portfolio consists 100% of equity securities.
 
 
 
Top 5 Hold
in
gs (% of Net
As
sets)
   
 
 
 
AXIS Capital Holdings Ltd.
      3.65 % 
Sportradar Group AG
      3.2 % 
Globus Medical, Inc.
      2.7 % 
TXNM Energy, Inc.
      2.5 % 
Monarch Casino & Resort, Inc.
      2.4 % 
Largest Holdings [Text Block]
 
 
 
Top 5 Hold
in
gs (% of Net
As
sets)
   
 
 
 
AXIS Capital Holdings Ltd.
      3.65 % 
Sportradar Group AG
      3.2 % 
Globus Medical, Inc.
      2.7 % 
TXNM Energy, Inc.
      2.5 % 
Monarch Casino & Resort, Inc.
      2.4 %