N-2 - USD ($)

3 Months Ended

Jun. 04, 2026

Apr. 30, 2026

Mar. 31, 2026

Dec. 31, 2025

Sep. 30, 2025

Jun. 30, 2025

Mar. 31, 2025

Dec. 31, 2024

Sep. 30, 2024

Jun. 30, 2024

Mar. 31, 2024

Dec. 31, 2023

Sep. 30, 2023

Cover [Abstract]

Entity Central Index Key

0001160990

Amendment Flag

false

Document Type

424B5

Entity Registrant Name

PIMCO Corporate & Income Strategy Fund

Fee Table [Abstract]

Shareholder Transaction Expenses [Table Text Block]

Shareholder Transaction Expenses

Sales load (as a percentage of offering price)	1.00% (1)
Offering Expenses Borne by Common Shareholders (as a percentage of offering price)	0.06%
Dividend Reinvestment Plan Fees	None (2)

Represents the maximum commission with respect to the Common Shares being sold in this offering that the Fund may pay to JonesTrading in connection with sales of Common

Shares effected by JonesTrading in this offering. This is the only sales load to be paid in connection with this offering. There is no guarantee that there will be any sales of Common

Shares pursuant to this Prospectus Supplement and the accompanying Prospectus.

You will pay brokerage charges if you direct your broker or the plan agent to sell your Common Shares that you acquired pursuant to a dividend reinvestment plan. You may also pay a

pro rata share of brokerage commissions incurred in connection with open-market purchases pursuant to the Fund’s Dividend Reinvestment Plan. See “Dividend Reinvestment Plan” in

the accompanying Prospectus.

Sales Load [Percent]

^[1]

1.00%

Dividend Reinvestment and Cash Purchase Fees

^[2]

$ 0

Other Transaction Expenses [Abstract]

Other Transaction Expenses [Percent]

0.06%

Annual Expenses [Table Text Block]

Annual Expenses

	Percentage of Net Assets Attributable to Common Shares (reflecting leverage attributable to reverse repurchase agreements)
Management Fees (1)	0.81%
Interest Payments on Borrowed Funds (2)	0.46%
Other Expenses (3)	0.02%
Total Annual Expenses (4)	1.29%

Management Fees include fees payable to the Investment Manager for advisory services and for supervisory, administrative and other services. The Fund pays for the advisory,

supervisory and administrative services it requires under what is essentially an all-in fee structure (the “unified management fee”). Pursuant to an investment management agreement,

PIMCO is paid a Management Fee of 0.81% of the Fund’s average daily net assets (including daily net assets attributable to any preferred shares of the Fund that may be outstanding).

The Fund (and not PIMCO) will be responsible for certain fees and expenses, which are reflected in the table above, that are not covered by the management fee under the investment

management agreement. Please see “Management of the Fund– Investment Management Agreement” in the accompanying Prospectus for an explanation of the unified management

fee and definition of “daily net assets.”

Reflects the Fund’s use of leverage in the form of reverse repurchase agreements averaged over the period ended December 31, 2025, which represented 9.00% of the Fund’s average

total managed assets, including the assets attributable to leverage (or 9.89% of the Fund’s average net assets attributable to Common Shares), as of that date, at an annual interest

rate cost to the Fund of 4.45%, which is the weighted average interest rate cost during the period ended December 31, 2025. See “Use of Leverage—Effects of Leverage” in the

accompanying Prospectus. The actual amount of interest expense borne by the Fund will vary over time in accordance with the level of the Fund’s use of reverse repurchase agreements,

dollar rolls/buybacks and/or borrowings and variations in market interest rates. Borrowing expense is required to be treated as an expense of the Fund for accounting purposes. Any

associated income or gains (or losses) realized from leverage obtained through such instruments is not reflected in the Annual Expenses table above, but would be reflected in the

Fund’s performance results.

“Other Expenses” are estimated for the Fund’s current fiscal year ending June 30, 2026.

“Interest Payments on Borrowed Funds” are borne by the Fund separately from the management fees paid to PIMCO. Excluding these expenses, Total Annual Expenses are 0.83%.

Management Fees [Percent]

^[3]

0.81%

Interest Expenses on Borrowings [Percent]

^[4]

0.46%

Other Annual Expenses [Abstract]

Other Annual Expenses [Percent]

^[5]

0.02%

Total Annual Expenses [Percent]

^[6]

1.29%

Expense Example [Table Text Block]

Example

The following example illustrates the expenses that you would pay on a $1,000 investment in Common Shares of the Fund (including an assumed

total sales load or commission of 1.00% and the other estimated costs of this offering to be borne by the holders of the Common Shares of 0.06%),

assuming (1) that the Fund’s net assets do not increase or decrease, (2) that the Fund incurs total annual expenses of 1.29% of net assets

attributable to Common Shares in years 1 through 10 (assuming assets attributable to reverse repurchase agreements representing 9.00% of the

Fund’s total managed assets) and (3) a 5% annual return

(1)

	1 Year	3 Years	5 Years	10 Years
Total Expenses Incurred	$13	$41	$71	$155

The example above should not be considered a representation of future expenses. Actual expenses may be higher or lower than those shown. The example assumes that the estimated

Interest Payments on Borrowed Funds and Other Expenses set forth in the Annual Expenses table are accurate, that the rate listed under Total Annual Expenses remains the same each

year and that all dividends and distributions are reinvested at NAV. Actual expenses may be greater or less than those assumed. Moreover, the Fund’s actual rate of return may be

greater or less than the hypothetical 5% annual return shown in the example.

Expense Example, Year 01

^[7]

$ 13

Expense Example, Years 1 to 3

^[7]

Expense Example, Years 1 to 5

^[7]

Expense Example, Years 1 to 10

^[7]

$ 155

Purpose of Fee Table , Note [Text Block]

The following table is intended to assist investors in understanding the fees and expenses (annualized) that an investor in Common Shares of the

Fund would bear, directly or indirectly, as a result of an offering. The table reflects the use of leverage attributable to the Fund's reverse repurchase

agreements averaged over the period ended December 31, 2025 in an amount equal to 9.00% of the Fund’s average total managed assets, including

the assets attributable to such leverage (or 9.89% of the Fund’s average total net assets attributable to Common Shares) and shows Fund expenses

as a percentage of net assets attributable to Common Shares. The percentages above do not reflect the Fund’s use of other forms of economic

leverage, such as credit default swaps or other derivative instruments. The extent of the Fund’s assets attributable to leverage following an offering,

and the Fund’s associated expenses, are likely to vary (perhaps significantly) from these assumptions.

Basis of Transaction Fees, Note [Text Block]

as a percentage of offering price

Other Expenses, Note [Text Block]

“Other Expenses” are estimated for the Fund’s current fiscal year ending June 30, 2026.

Management Fee not based on Net Assets, Note [Text Block]

Management Fees include fees payable to the Investment Manager for advisory services and for supervisory, administrative and other services. The Fund pays for the advisory, supervisory and administrative services it requires under what is essentially an all-in fee structure (the “unified management fee”). Pursuant to an investment management agreement, PIMCO is paid a Management Fee of 0.81% of the Fund’s average daily net assets (including daily net assets attributable to any preferred shares of the Fund that may be outstanding). The Fund (and not PIMCO) will be responsible for certain fees and expenses, which are reflected in the table above, that are not covered by the management fee under the investment management agreement. Please see “Management of the Fund– Investment Management Agreement” in the accompanying Prospectus for an explanation of the unified management fee and definition of “daily net assets.”

General Description of Registrant [Abstract]

Investment Objectives and Practices [Text Block]

Investment Objectives

The Fund’s primary investment objective is to seek high current income. Capital preservation and appreciation are secondary objectives.

Investment Strategy

The Fund seeks to achieve its investment objectives by utilizing a dynamic asset allocation strategy that focuses on duration management, credit

quality analysis, risk management techniques and broad diversification among issuers, industries and sectors. The Fund normally invests in a portfolio

that consists primarily of corporate debt obligations of varying maturities, other corporate income-producing securities, and income-producing

securities of non-corporate issuers. In managing the Fund, Pacific Investment Management Company LLC, the Fund's investment manager (“PIMCO”

or the “Investment Manager”), employs an active approach to allocation among multiple fixed income sectors based on, among other things, market

conditions, valuation assessments and economic outlook, credit market trends and other economic factors. PIMCO manages the Fund with a focus on

seeking income generating investment ideas across multiple fixed income sectors, with an emphasis on seeking opportunities in developed and

emerging global credit markets. The types of securities and instruments in which the Fund may invest are summarized under “Portfolio Contents” in

the accompanying Prospectus. The Fund cannot assure you that it will achieve its investment objectives, and you could lose all of your investment in

the Fund.

Risk Factors [Table Text Block]

Risks

Investment in the Common Shares involves substantial risks arising from, among other strategies, the Fund’s ability to invest in debt instruments that

are, at the time of purchase, rated below investment grade (below Baa3 by Moody’s Investors Service, Inc. or below BBB- by either S&P Global Ratings

or Fitch Ratings, Inc.) or that are unrated but determined by PIMCO to be of comparable quality, the Fund’s exposure to foreign (including emerging

markets) securities and currencies and to mortgage-related and other asset-backed securities, and the Fund’s use of leverage. Debt instruments of

below investment grade quality are regarded as having predominantly speculative characteristics with respect to capacity to pay interest and to repay

principal, and are commonly referred to as “high yield” securities or “junk bonds.” The Fund’s exposure to foreign securities and currencies, and

particularly to emerging markets securities and currencies, involves special risks, including foreign currency risk and the risk that the securities may

decline in response to unfavorable political and legal developments, unreliable or untimely information or economic and financial instability.

Mortgage-related and other asset-backed securities are subject to extension and prepayment risk and often have complicated structures that make

them difficult to value. Because of the risks associated with investing in high yield securities, foreign (including emerging markets) securities (and

related exposure to foreign currencies) and mortgage-related and other asset-backed securities, and using leverage, an investment in the Fund should

be considered speculative. The sale of Common Shares by the Fund (or the perception that such sales may occur), particularly if sold at a discount to

the then-current market price of the Common Shares, may have an adverse effect on the market price of the Common Shares. Before investing in the

Common Shares, you should read the discussion of the principal risks of investing in the Fund in “Principal Risks of the Fund” in the accompanying

Prospectus. Certain of these risks are summarized in “Prospectus Summary—Principal Risks of the Fund” in the accompanying Prospectus. The Fund

cannot assure you that it will achieve its investment objectives, and you could lose all of your investment in the Fund.

Share Price [Table Text Block]

Market and Net Asset Value Information

The following table sets forth, for each of the periods indicated, the high and low closing market prices of the Fund’s Common Shares on the NYSE,

the high and low NAV per Common Share and the high and low premium/discount to NAV per Common Share. See “Net Asset Value” in the

accompanying Prospectus for information as to how the Fund’s NAV is determined.

	Common share market price (1)		Common share net asset value		Premium (discount) as a % of net asset value
Quarter	High	Low	High	Low	High	Low
Quarter ended March 31, 2026	$12.88	$11.43	$12.00	$11.41	8.47%	0.18%
Quarter ended December 31, 2025	$13.44	$12.34	$12.01	$11.81	12.58%	4.14%
Quarter ended September 30, 2025	$13.45	$12.52	$12.00	$11.68	12.84%	6.03%
Quarter ended June 30, 2025	$13.64	$11.76	$11.81	$11.37	15.79%	1.91%
Quarter ended March 31, 2025	$13.81	$13.34	$11.96	$11.75	16.47%	12.40%
Quarter ended December 31, 2024	$14.30	$13.32	$11.98	$11.81	19.57%	12.60%
Quarter ended September 30, 2024	$14.19	$13.08	$11.97	$11.38	20.02%	12.85%
Quarter ended June 30, 2024	$14.21	$12.46	$11.66	$11.35	22.08%	8.82%
Quarter ended March 31, 2024	$13.97	$12.37	$11.68	$11.41	19.81%	7.19%
Quarter ended December 31, 2023	$12.66	$10.75	$11.58	$10.58	14.93%	1.32%
Quarter ended September 30, 2023	$14.24	$12.17	$11.15	$10.83	29.00%	11.55%

Such prices reflect inter-dealer prices, without retail mark-up, mark-down or commission and may not represent actual transactions.

The Fund's NAV per Common Share at the close of business on April 30, 2026 was $11.56 and the last reported sale price of a Common Share on the

NYSE on that day was $12.02, representing a 3.98% premium to such NAV. As of April 30, 2026, the net assets of the Fund attributable to Common

Shares were $863,423,039 and the Fund had outstanding 74,721,061 Common Shares.

Capital Stock, Long-Term Debt, and Other Securities [Abstract]

Capital Stock [Table Text Block]

Capitalization

Pursuant to the Sales Agreement, the Fund may offer and sell Common Shares having an aggregate offering price of up to $350,000,000, from time

to time through JonesTrading as its agent for the offer and sale of the Common Shares under this Prospectus Supplement and the accompanying

Prospectus. There is no guarantee that there will be any sales of the Common Shares pursuant to this Prospectus Supplement and the accompanying

Prospectus. The table below assumes that the Fund will sell 29,118,136 Common Shares at an assumed price of $12.02 per share (the last reported

sale price per share of the Common Shares on the NYSE on April 30, 2026). Actual sales, if any, of the Common Shares, and the actual application of

the proceeds thereof, under this Prospectus Supplement and the accompanying Prospectus may be different than as set forth in the table below. In

addition, the price per share of any such sale may be greater or less than $12.02, depending on the market price of the Common Shares at the time

of any such sale. To the extent that the market price per share of the Common Shares on any given day is less than the NAV per share on such day,

the Fund will instruct JonesTrading not to make any sales on such day.

The following table sets forth the Fund’s capitalization at December 31, 2025:

■

on a historical basis, and

■

on a pro forma basis as adjusted to reflect (i) the assumed sale of 29,118,136 Common Shares at an assumed price of $12.02 per share (the

last reported sale price per share of the Common Shares on the NYSE on April 30, 2026), in an offering under this Prospectus Supplement and

the accompanying Prospectus; (ii) the investment of net proceeds assumed from such offering in accordance with the Fund’s investment

objectives and policies, after deducting the assumed commission representing an estimated commission of $3,500,000 paid to JonesTrading

of 1.00% of the gross proceeds in connection with sales of Common Shares effected by JonesTrading in this offering and estimated offering

expenses payable by the Fund of $468,988; and (iii) investment of net proceeds received from 2,056,401 Common Shares sold between

January 1, 2026 and April 30, 2026 in a prior “at the market” offering (the “Prior ATM”).

	As of December 31, 2025
	Actual	As Adjusted
Composition of Net Assets (dollar amounts in thousands):
Common Shares:
Common Shares, par value $0.00001 per share, unlimited shares authorized (72,389,056 shares outstanding as of December 31, 2025, and 103,852,993 (1) shares estimated issued and outstanding as adjusted)	$1	$1
Paid-in-capital in excess of par	$1,005,997	$1,381,079
Distributable earnings (accumulated loss)	$(141,706)	$(171,109)
Net Assets Applicable to Holders of Common Shares	$864,292	$1,209,971
Capitalization	$864,292	$1,209,971

(1)

This amount (i) includes 289,400 shares issued pursuant to the Fund’s dividend reinvestment plan between January 1, 2026 and April 30, 2026 (see “Dividend Reinvestment Plan” in

the accompanying Prospectus) and (ii) excludes Common Shares sold in the Prior ATM since April 30, 2026.

Common Shares [Member]

Other Annual Expenses [Abstract]

Basis of Transaction Fees, Note [Text Block]

as a percentage of offering price

General Description of Registrant [Abstract]

Lowest Price or Bid

^[8]

$ 11.43

$ 12.34

$ 12.52

$ 11.76

$ 13.34

$ 13.32

$ 13.08

$ 12.46

$ 12.37

$ 10.75

$ 12.17

Highest Price or Bid

^[8]

12.88

13.44

13.45

13.64

13.81

14.3

14.19

14.21

13.97

12.66

14.24

Lowest Price or Bid, NAV

11.41

11.81

11.68

11.37

11.75

11.81

11.38

11.35

11.41

10.58

10.83

Highest Price or Bid, NAV

$ 12

$ 12.01

$ 12

$ 11.81

$ 11.96

$ 11.98

$ 11.97

$ 11.66

$ 11.68

$ 11.58

$ 11.15

Highest Price or Bid, Premium (Discount) to NAV [Percent]

8.47%

12.58%

12.84%

15.79%

16.47%

19.57%

20.02%

22.08%

19.81%

14.93%

29.00%

Lowest Price or Bid, Premium (Discount) to NAV [Percent]

0.18%

4.14%

6.03%

1.91%

12.40%

12.60%

12.85%

8.82%

7.19%

1.32%

11.55%

Share Prices Not Actual Transactions [Text Block]

Such prices reflect inter-dealer prices, without retail mark-up, mark-down or commission and may not represent actual transactions.

Share Price

$ 12.02

NAV Per Share

$ 11.56

Latest Premium (Discount) to NAV [Percent]

3.98%

Capital Stock, Long-Term Debt, and Other Securities [Abstract]

Outstanding Security, Not Held [Shares]

74,721,061

Common Stocks [Member]

Capital Stock, Long-Term Debt, and Other Securities [Abstract]

Outstanding Securities [Table Text Block]

Common Shares:

Outstanding Security, Not Held [Shares]

^[9]

103,852,993

[1]	Represents the maximum commission with respect to the Common Shares being sold in this offering that the Fund may pay to JonesTrading in connection with sales of Common Shares effected by JonesTrading in this offering. This is the only sales load to be paid in connection with this offering. There is no guarantee that there will be any sales of Common Shares pursuant to this Prospectus Supplement and the accompanying Prospectus.
[2]	You will pay brokerage charges if you direct your broker or the plan agent to sell your Common Shares that you acquired pursuant to a dividend reinvestment plan. You may also pay a pro rata share of brokerage commissions incurred in connection with open-market purchases pursuant to the Fund’s Dividend Reinvestment Plan. See “Dividend Reinvestment Plan” in the accompanying Prospectus.
[3]	Management Fees include fees payable to the Investment Manager for advisory services and for supervisory, administrative and other services. The Fund pays for the advisory, supervisory and administrative services it requires under what is essentially an all-in fee structure (the “unified management fee”). Pursuant to an investment management agreement, PIMCO is paid a Management Fee of 0.81% of the Fund’s average daily net assets (including daily net assets attributable to any preferred shares of the Fund that may be outstanding). The Fund (and not PIMCO) will be responsible for certain fees and expenses, which are reflected in the table above, that are not covered by the management fee under the investment management agreement. Please see “Management of the Fund– Investment Management Agreement” in the accompanying Prospectus for an explanation of the unified management fee and definition of “daily net assets.”
[4]	Reflects the Fund’s use of leverage in the form of reverse repurchase agreements averaged over the period ended December 31, 2025, which represented 9.00% of the Fund’s average total managed assets, including the assets attributable to leverage (or 9.89% of the Fund’s average net assets attributable to Common Shares), as of that date, at an annual interest rate cost to the Fund of 4.45%, which is the weighted average interest rate cost during the period ended December 31, 2025. See “Use of Leverage—Effects of Leverage” in the accompanying Prospectus. The actual amount of interest expense borne by the Fund will vary over time in accordance with the level of the Fund’s use of reverse repurchase agreements, dollar rolls/buybacks and/or borrowings and variations in market interest rates. Borrowing expense is required to be treated as an expense of the Fund for accounting purposes. Any associated income or gains (or losses) realized from leverage obtained through such instruments is not reflected in the Annual Expenses table above, but would be reflected in the Fund’s performance results.
[5]	“Other Expenses” are estimated for the Fund’s current fiscal year ending June 30, 2026.
[6]	“Interest Payments on Borrowed Funds” are borne by the Fund separately from the management fees paid to PIMCO. Excluding these expenses, Total Annual Expenses are 0.83%.
[7]	The example above should not be considered a representation of future expenses. Actual expenses may be higher or lower than those shown. The example assumes that the estimated Interest Payments on Borrowed Funds and Other Expenses set forth in the Annual Expenses table are accurate, that the rate listed under Total Annual Expenses remains the same each year and that all dividends and distributions are reinvested at NAV. Actual expenses may be greater or less than those assumed. Moreover, the Fund’s actual rate of return may be greater or less than the hypothetical 5% annual return shown in the example.
[8]	Such prices reflect inter-dealer prices, without retail mark-up, mark-down or commission and may not represent actual transactions.
[9]	This amount (i) includes 289,400 shares issued pursuant to the Fund’s dividend reinvestment plan between January 1, 2026 and April 30, 2026 (see “Dividend Reinvestment Plan” in the accompanying Prospectus) and (ii) excludes Common Shares sold in the Prior ATM since April 30, 2026.