Rydex Series Funds

Real Estate Fund

INVESTMENT OBJECTIVE

The Real Estate Fund (the “Fund”) seeks to provide capital appreciation by investing in companies that are involved in the real estate industry, including real estate investment trusts (“REITs”) (collectively, “Real Estate Companies”).

FEES AND EXPENSES OF THE FUND

This table describes the fees and expenses that you may pay if you buy, hold and sell Class H shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.

SHAREHOLDER FEES (fees paid directly from your investment)

N/A

ANNUAL FUND OPERATING EXPENSES

(expenses that you pay each year as a percentage of the value of your investment)

	Class H
Management Fees	0.85 %
Distribution and/or Service (12b-1) Fees	0.25 %
Other Expenses	0.58 %
Total Annual Fund Operating Expenses	1.68 %
Fee Waiver (and/or expense reimbursement)1	-0.05 %
Total Annual Fund Operating Expenses After Fee Waiver (and/or expense reimbursement)	1.63 %

The Advisor has contractually agreed, through August 1, 2027, to waive and/or reimburse the Fund’s expenses in an amount equal to an annual percentage rate of 0.05% of the Fund’s average daily net assets. The agreement shall automatically renew for one-year terms unless the Advisor provides written notice to the Fund of the termination of the agreement. The agreement may be terminated at any time by the Fund’s Board of Trustees and when the Advisor ceases to serve as such.

EXAMPLE

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses remain the same. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

1 Year	3 Years	5 Years	10 Years
$166	$525	$908	$1,983

PORTFOLIO TURNOVER

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the Total Annual Fund Operating Expenses or the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 1408% of the average value of its portfolio. The Fund’s portfolio turnover rate is calculated without regard to cash instruments and most derivatives. If such instruments were included, the Fund’s portfolio turnover rate might be significantly higher.

PRINCIPAL INVESTMENT STRATEGIES

Under normal circumstances, the Fund invests substantially all (at least 80%) of its net assets in equity securities of Real Estate Companies that are traded in the United States and in derivatives, which primarily consist of futures contracts and options on securities, futures contracts, and stock indices. The Advisor employs a proprietary quantitative and qualitative methodology to identify Real Estate Companies in which to invest. The methodology utilizes screens based on price, liquidity, and tradability. The securities are then weighted using a proprietary modified capitalization weighting methodology. The portfolio may be further adjusted to comply with regulatory investment limitations or as determined appropriate by the Advisor.

1 | SUMMARY PROSPECTUS

The Fund may invest to a significant extent in the securities of Real Estate Companies that have small to mid-sized capitalizations. Real Estate Companies, which also include master limited partnerships, are primarily engaged in the ownership, construction, management, financing or sale of residential, commercial or industrial real estate. Real Estate Companies also may include companies whose products and services are related to the real estate industry, such as building supply manufacturers, mortgage lenders, or mortgage servicing companies, as well as companies that are significantly involved in multiple industries, including the real estate industry. The Fund also may purchase American Depositary Receipts (“ADRs”) to gain exposure to foreign Real Estate Companies and U.S. government securities.

Investments in derivative instruments, such as futures and options, have the economic effect of creating financial leverage in the Fund’s portfolio because such investments may give rise to losses that exceed the amount the Fund has invested in those instruments. Financial leverage will magnify, sometimes significantly, the Fund’s exposure to any increase or decrease in prices associated with a particular reference asset resulting in increased volatility in the value of the Fund’s portfolio. The value of the Fund’s portfolio is likely to experience greater volatility over short-term periods. While such financial leverage has the potential to produce greater gains, it also may result in greater losses, which in some cases may cause the Fund to liquidate other portfolio investments at a loss to comply with limits on leverage imposed by the Investment Company Act of 1940, satisfy margin or collateral requirements, or meet redemption requests.

In an effort to ensure that the Fund is fully invested on a day-to-day basis, the Fund may conduct any necessary trading activity at or just prior to the close of the U.S. financial markets. As of June 30, 2026, the Fund has significant exposure to the Real Estate Sector, as that sector is defined by the Global Industry Classification Standard, a widely recognized industry classification methodology developed by MSCI, Inc. and Standard & Poor’s Financial Services LLC. Also, as of June 30, 2026, the Fund’s investments are concentrated (i.e., more than 25% of its assets) in securities issued by companies in the Specialized REITs Industry, a separate industry within the Real Estate Sector.

PRINCIPAL RISKS

The value of an investment in the Fund will fluctuate and is subject to investment risks, which means investors could lose money, including all or part of their investment in the Fund. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the FDIC or any governmental agency. There is no assurance that the Fund will achieve its investment objective. An investment in the Fund does not constitute a complete investment program. The Fund is subject to certain risks and the principal risks of investing in the Fund are summarized below in alphabetical order, and not in the order of importance or potential exposure. The relative significance of each principal risk summarized below may change over time and you should review each risk carefully because any one or more of these risks may result in losses to the Fund. Please see “More Information About the Trust and the Funds – Principal Risks” in the Fund’s Prospectus for a more detailed description of the risks of investing in the Fund.

Depositary Receipt Risk—The Fund may hold the securities of non-U.S. companies in the form of depositary receipts. The underlying securities of the depositary receipts in the Fund’s portfolio are subject to fluctuations in foreign currency exchange rates that may affect the value of the Fund’s portfolio. In addition, the value of the securities underlying the depositary receipts may change materially when the U.S. markets are not open for trading. Investments in the underlying foreign securities also involve political and economic risks distinct from those associated with investing in the securities of U.S. issuers.

Derivatives Risk—Derivatives and other instruments (collectively referred to in this paragraph as “derivatives”) pose risks in addition to and greater than those associated with investing directly in securities, currencies or other investments, including risks relating to leverage, market conditions and market risk, imperfect correlations with underlying investments or the Fund’s other portfolio holdings, high price volatility, lack of availability, counterparty credit, liquidity, valuation, operational and legal restrictions and risk. The use of derivatives is a highly specialized activity that involves investment techniques and risks different from those associated with ordinary portfolio securities transactions. In addition, the use of derivatives may result in leverage, which may cause the Fund to be more volatile and riskier than if it had not been leveraged. Changes in the value of a derivative also may create sudden margin delivery or settlement payment obligations for the Fund, which can materially affect the performance of the Fund, its liquidity, and other aspects of the Fund’s risk profile. If the Advisor is incorrect about its expectations of market conditions, the use of derivatives also could result in a loss, which in some cases may be unlimited. Certain risks are specific to the particular type of derivative instrument in which the Fund may invest. For example, some of the derivatives in which the Fund invests may be traded (and privately negotiated) in the over-the-counter (“OTC”) market. OTC derivatives are subject to heightened counterparty credit, legal, liquidity and valuation risks.

SUMMARY PROSPECTUS | 2

Futures Contracts Risk—Futures contracts are exchange-traded contracts that call for the future delivery of an asset at a certain price and date, or cash settlement of the terms of the contract. Risks of futures contracts include imperfect correlation between the movements in the price of the instruments and the price of the underlying assets. In addition, there is a risk that the Fund may not be able to enter into a closing transaction because of an illiquid market. Exchanges can limit the number of futures positions that can be held or controlled by the Fund or the Advisor, thus limiting the ability to implement the Fund’s strategies. Futures markets are highly volatile and the use of futures may increase the volatility of the Fund’s net asset value (“NAV”) per share. Futures also are subject to leverage and liquidity risks. The Fund may invest in standard futures contracts, e-mini futures contracts, and micro e-mini futures contracts depending on the investment exposure needs of the Fund. E-mini futures contracts and micro e-mini futures contracts are similar to standard futures contracts, except that they are electronically traded and e-mini futures contracts generally are one-fifth the size of standard futures contracts and micro e-mini futures contracts generally are one-tenth the size of e-mini futures contracts.

Options Risk—Options and options on futures contracts give the holder of the option the right, but not the obligation, to buy (or to sell) a position in a security or in a contract to the writer of the option, at a certain price. Options are subject to correlation risk because there may be an imperfect correlation between the options and the markets for underlying instruments that could cause a given transaction to fail to achieve its objectives. The successful use of options depends on the Advisor’s ability to predict correctly future price fluctuations and the degree of correlation between the markets for options and the underlying instruments. Exchanges can limit the number of options positions that can be held or controlled by the Fund or the Advisor, thus limiting the ability to implement the Fund’s strategies. Options also are particularly subject to leverage risk and can be subject to liquidity risk.

Early Closing Risk—The Fund is subject to the risk that unanticipated early closings of securities exchanges and other financial markets may result in the Fund’s inability to buy or sell securities or other financial instruments on that day and may cause the Fund to incur substantial trading losses.

Equity Securities Risk—Equity securities include common stocks and other equity and equity-related securities (and securities convertible into stocks). The prices of equity securities generally fluctuate more than those of fixed-income investments, may rise or fall rapidly or unpredictably, and may reflect real or perceived changes in the issuing company’s financial condition and changes in the overall market or economy. A decline in the value of equity securities held by the Fund will adversely affect the value of your investment in the Fund. Common stocks generally represent the riskiest investment in a company and dividend payments (if declared) to preferred stockholders generally rank junior to payments due to a company’s debtholders. The Fund may lose a substantial part, or even all, of its investment in a company’s stock.

Foreign Issuer Exposure Risk—The Fund may invest in securities of foreign companies directly or in financial instruments that are indirectly linked to the performance of foreign issuers, such as ADRs. The Fund’s exposure to foreign issuers and investments in foreign securities, if any, carry unique, additional and heightened risks when compared to U.S. securities, including, but not limited to: currency fluctuations; adverse political (including geopolitical), social and economic developments; trade restrictions (including tariffs) or other government restrictions by the U.S. or other governments; unreliable, untimely or less publicly available information; less government supervision; reporting, accounting, and auditing standards that are not comparable to those in the United States; less liquidity and more volatility; limited legal recourse; and higher transactional costs.

Industry Concentration Risk—The Fund expects to concentrate its investments in a limited number of issuers conducting business in the same industry or group of related industries. To the extent the Fund does so, the Fund is more vulnerable to adverse market, economic, regulatory, political or other developments affecting that industry or group of related industries than a fund that invests its assets more broadly. As of June 30, 2026, the Fund’s investments are concentrated in securities issued by companies in the Specialized REITs Industry. As a result of the Fund's concentration in the Specialized REITs Industry, the Fund is subject to the risks associated with that Industry. The Specialized REITs Industry is a separate industry within the Real Estate Sector that includes companies or trusts engaged in the acquisition, development, ownership, leasing, management and operation of various sub-industries, including self-storage properties, telecom towers and related structures that support wireless telecommunications, timberland and timber-related properties, data center properties, and other REITs that manage and own properties such as natural gas and crude oil pipeline, gas stations, fiber optic cables, prisons, automobile parking, and automobile dealerships. For additional information regarding the Fund’s investments in REITs, see “Sector Risk” and “Real Estate Investment Trusts (“REITs”) Risk” below.

3 | SUMMARY PROSPECTUS

Market Risk—The value of, or income generated by, the investments held by the Fund may fluctuate rapidly and unpredictably. These fluctuations may be frequent and significant. In addition, the Fund may incur losses as a result of various market and economic factors, such as those affecting (or perceived to affect) individual companies or issuers or particular industries, or from broader influences, such as general market conditions. In addition, responses to government actions or interventions (including, but not limited, to the threat or imposition of tariffs, trade restrictions, currency restrictions or similar actions) as well as developments related to economic, political (including geopolitical), social, public health, market, extreme weather, natural or man-made disasters or other conditions or events may cause volatility in financial markets and reduced liquidity in equity, credit and/or debt markets, which could adversely impact the Fund and its investments and their value and performance. Under such conditions, the Fund (or an underlying fund) may experience significant redemption activity by shareholders and could be forced to sell portfolio securities or other assets at unfavorable prices in an effort to generate sufficient cash to pay redeeming shareholders. Certain securities may be difficult to value under such conditions. The Fund’s investments may perform poorly or underperform the general securities markets or other types of securities.

Mid-Capitalization Securities Risk—The Fund is subject to the risk that mid-capitalization securities may underperform other segments of the equity market or the equity market as a whole. Securities of mid-capitalization companies may be more speculative, volatile and less liquid than securities of large companies. In addition, mid-capitalization companies may have inexperienced management as well as limited product and market diversification and financial resources and may be more vulnerable to adverse developments than large capitalization companies. Mid-capitalization companies may also underperform the securities of small-capitalization companies because mid-capitalization companies are more mature and are subject to slower growth during economic expansion.

Portfolio Turnover Risk—The Fund’s strategy may frequently involve buying and selling portfolio securities, which may lead to increased costs to the Fund. Portfolio turnover risk may cause the Fund’s performance to be less than you expect.

Real Estate Investment Trusts (“REITs”) Risk—REITs are classified as equity REITs, mortgage REITs or hybrid REITs. Equity REITs own real estate directly and the value of, and income earned by, the REITs depends upon the income of the underlying properties and the rental income they earn. Mortgage REITs make construction, development or long-term mortgage loans and are sensitive to the credit quality of the borrower. Mortgage REITs derive their income from interest earned on such mortgage loans. Hybrid REITs generally hold both ownership interests and mortgage interests in real estate. In addition to the risks pertaining to real estate investments more generally, REITs may be subject to additional risks, including risks associated with the direct ownership of real property, including declines in the value of real estate, risks related to general and local economic conditions, overbuilding and increased competition, increases in property taxes and operating expenses and variations in rental income. REITs (especially mortgage REITs) also are subject to interest rate and prepayment risks. The value of a REIT can depend on the structure of, and cash flow generated by, the REIT. REITs whose investments are concentrated in a limited number or type of properties, investments or narrow geographic area are subject to the risks affecting those properties or areas to a greater extent than a REIT with less concentrated investments. U.S. REITs also are subject to certain provisions under federal tax law. In addition, REITs may have expenses, including advisory and administration expenses, and the Fund and its shareholders will incur its pro rata share of the underlying expenses.

Regulatory and Legal Risk—U.S. and non-U.S. governmental agencies and other regulators regularly implement additional regulations (or amend regulations) and legislators pass new laws that affect the investments held by the Fund, the strategies used by the Fund and/or the level of regulation or taxation applicable to the Fund, its investments or service providers. These developments impact the investment strategies, performance, costs and operations of the Fund or taxation of shareholders.

Sector Risk—To the extent the Fund’s holdings have significant exposure to one or more market sectors, the Fund may be especially sensitive to the developments affecting and risks of such market sectors. As of June 30, 2026, the Fund is subject to the Sector Risk described below.

Real Estate Sector Risk. The Fund's investments are exposed to issuers conducting business in the Real Estate Sector. The Real Estate Sector includes companies operating in real estate development and operations. It also includes companies offering real estate-related services and REITs. The Fund is subject to the risk that the securities of such issuers will underperform the market as a whole due to legislative or regulatory changes, adverse market conditions and/or increased competition affecting the Real Estate Sector. The performance of companies operating in the Real Estate Sector has historically been cyclical and

SUMMARY PROSPECTUS | 4

particularly sensitive to the overall economy and market changes, including declines in the value of real estate or, conversely, saturation of the real estate market, economic downturns and defaults by borrowers or tenants during such periods, increases in competition, limited availability of mortgage funds or other limits to accessing the credit or capital markets, and changes in interest rates.

Shareholder Trading Risk—The Fund may be used as a tool for certain investors that employ trading strategies involving frequent trading. Such trading strategies may lead to increased portfolio turnover in the Fund, higher transaction costs, and the possibility of increased short-term capital gains (which will be taxable to shareholders as ordinary income when distributed to them) and/or long-term capital gains. Large movements of assets into and out of the Fund due to active or frequent trading also may adversely affect the Fund's ability to achieve its investment objective.

Small-Capitalization Securities Risk—The Fund is subject to the risk that small-capitalization securities may underperform other segments of the equity market or the equity market as a whole. Securities of small-capitalization companies may be more speculative, volatile and less liquid than securities of larger companies. Small-capitalization companies tend to have inexperienced management as well as limited product and market diversification and financial resources and may be more vulnerable to adverse developments than mid- or large-capitalization companies.

Temporary Defensive Investment Risk—The Advisor generally does not attempt to take defensive positions in the Fund in declining markets. Therefore, the Fund may be subject to greater losses in a declining market than a fund that does take defensive positions in declining markets.

Trading Halt Risk—The Fund typically will hold futures contracts and short-term options. The major exchanges on which these contracts are traded, such as the Chicago Mercantile Exchange, have established limits on how much the trading price of a futures contract or option may decline over various time periods within a day, and may halt trading in a contract that exceeds such limits. If a trading halt occurs, the Fund may temporarily be unable to purchase or sell certain securities, futures contracts or options. Such a trading halt near the time the Fund prices its shares may limit the Fund’s ability to fully invest its assets, which could adversely affect performance, and may prevent the Fund from achieving its investment objective.

PERFORMANCE INFORMATION

The bar chart below shows the performance of the Class H shares of the Fund from year to year. The variability of performance over time provides an indication of the risks of investing in the Fund. The table below shows the performance of the Class H shares of the Fund as an average over different periods of time in comparison to the performance of a broad-based securities market index intended to represent the overall market (S&P 500® Index) and an additional index (MSCI U.S. REIT Index). The MSCI U.S. REIT Index serves as an additional comparative index to provide shareholders a means to compare the Fund’s performance with that of an index the Advisor believes is representative of the Fund’s investment universe. The figures in the bar chart and table assume the reinvestment of dividends and capital gains distributions. The performance information below reflects applicable fee waivers and/or expense limitations in effect during the periods shown. Of course, this past performance (before and after taxes) does not necessarily indicate how the Fund will perform in the future.

Updated performance information is available on the Fund’s website at www.guggenheiminvestments.com or by calling 1-800-820-0888.

5 | SUMMARY PROSPECTUS

The performance information shown below for Class H shares is based on a calendar year.

During the periods shown in the chart above:	Quarter Ended	Return
Year-to-Date (not reflected in chart above)	June 30, 2026	10.38%
Highest Quarter	December 31, 2023	17.22%
Lowest Quarter	March 31, 2020	-29.47%

AVERAGE ANNUAL TOTAL RETURNS (for periods ended December 31, 2025)

After-tax returns shown in the table below are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.

	1 Year	5 Years	10 Years
Class H
Return Before Taxes	2.99%	3.14%	4.02%
Return After Taxes on Distributions	1.54%	2.28%	2.81%
Return After Taxes on Distributions and Sale of Fund Shares	1.77%	2.04%	2.57%
Indexes
S&P 500® Index1 (reflects no deduction for fees, expenses or taxes)	17.88%	14.42%	14.82%
MSCI U.S. REIT Index2 (reflects no deduction for fees, expenses or taxes)	2.91%	6.56%	5.70%

The S&P 500® Index is a broad-based index that includes 500 leading companies and covers approximately 80% of available market capitalization. The Index is widely regarded as the best single gauge of large-cap U.S. equities.

The MSCI U.S. REIT Index is a free float-adjusted market capitalization weighted index that is comprised of equity Real Estate Investment Trusts (REITs). The Index is based on the MSCI USA Investable Market Index (IMI), its parent index, which captures the large-, mid- and small-cap segments of the U.S. market. With 106 constituents, it represents about 99% of the U.S. REIT universe and securities are classified under the Equity REITs Industry (under the Real Estate Sector) according to the Global Industry Classification Standard (GICS®), have core real estate exposure (i.e., only selected Specialized REITs are eligible) and carry REIT tax status.

INVESTMENT ADVISOR

Security Investors, LLC, which operates under the name Guggenheim Investments, serves as the investment adviser of the Fund.

PORTFOLIO MANAGERS

•

Michael P. Byrum, CFA, Senior Managing Director and Portfolio Manager. Mr. Byrum has been associated with the Advisor since 1993.

SUMMARY PROSPECTUS | 6

•

Adrian Bachman, CFA, Director and Portfolio Manager. Mr. Bachman has most recently been associated with the Advisor since 2014. Mr. Bachman also was associated with the Advisor for an eleven-year period prior to 2008.

•

Brendan Cain, CFA, Vice President and Portfolio Manager. Mr. Cain has been associated with the Advisor since 2006.

•

Spencer Crane, CFA, Vice President and Portfolio Manager. Mr. Crane has been associated with the Advisor since 2012.

•

Scott Miller, Vice President and Portfolio Manager. Mr. Miller has been associated with the Advisor since 2008.

PURCHASE AND SALE OF FUND SHARES

The minimum initial investment amounts and minimum account balance requirements for Class H accounts held through a third party (e.g., a brokerage account) are typically:

•

$1,000 for retirement accounts

•

$2,500 for all other accounts

Accounts opened through a financial intermediary (non-direct) will be subject to your financial intermediary’s minimum initial investment amount and account balance requirements, which may be different than the amounts above.

Class H accounts held directly at Guggenheim Investments (other than those that are managed by financial professionals) are subject to a minimum initial investment and account balance of $5,000 (including retirement accounts).

Direct accounts managed by financial professionals are not subject to minimum initial investment and minimum account balance requirements.

There are no minimum amounts for subsequent investments in the Fund except for subsequent investments made via Automated Clearing House (“ACH”).

The Fund reserves the right to modify its minimum account balance requirements at any time, with or without prior notice to you.

The Fund redeems its shares continuously and investors may sell their shares back to the Fund on any day that the New York Stock Exchange (the “NYSE”) is open for business (a “Business Day”). You will ordinarily submit your transaction order through your financial intermediary or other securities dealers through which you opened your shareholder account or through Guggenheim Investments directly. The Fund also offers you the option to send redemption orders to Guggenheim Investments by mail, fax or telephone.

TAX INFORMATION

Fund distributions are generally taxable as ordinary income, qualified dividend income, or capital gains (or a combination thereof), unless your investment is in an individual retirement account or other tax-advantaged retirement account. Investments through a tax-advantaged retirement account may be subject to taxation upon withdrawal.

PAYMENTS TO BROKER-DEALERS AND OTHER FINANCIAL INTERMEDIARIES

If you purchase the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund and its related companies may pay the intermediary for the sale of Fund shares and related services. These payments may create a conflict of interest by influencing the broker-dealer or other intermediary and your sales person to recommend the Fund over another investment. Ask your sales person or visit your financial intermediary’s website for more information.

7 | SUMMARY PROSPECTUS

Ticker Symbol	Fund Name
RYHRX	Real Estate Fund


Mutual Funds	\|	Sector	\|	8.1.2026