Summary Prospectus by Investment Company (Form 497K)

Summary Prospectus May 1, 2025

A NO-LOAD MUTUAL FUND (CSRIX)

Cohen & Steers Institutional Realty Shares, Inc.

Investment Objective

The investment objective of Cohen & Steers Institutional Realty Shares, Inc. (the "Fund") is total return through investment in real estate securities.

Fund Fees and Expenses

This table describes the fees and expenses that you could pay if you buy and hold 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. If you purchase shares through a financial intermediary acting as an agent on behalf of its customers, that financial intermediary may charge you a commission. Such commissions, if any, are not charged by the Fund and are not reflected in the fee table or expense example below. 

Shareholder Fees (fees paid directly from your investment):
Maximum Sales Charge (Load) Imposed On Purchases (as % of offering price)	None
Maximum Deferred Sales Charge (Load) (as % of the net asset value at the time of purchase or redemption, whichever is lower)	None

 

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):
Management Fee	0.75%
Other Expenses	0.01%
Total Annual Fund Operating Expenses(1)	0.76%
Fee Waiver/Expense Reimbursement(1)	(0.01)%
Total Annual Fund Operating Expenses (after fee waiver/expense reimbursement)(1)	0.75%

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 $1,000,000 (the Fund's minimum initial investment) 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 pursuant to its agreement with the Advisor. 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
$7,659	$23,969	$41,693	$93,032

1

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 annual fund operating expenses or in the example, affect the Fund's performance. During the Fund's most recent fiscal year, the Fund's portfolio turnover rate was 30% of the average value of its portfolio.

Principal Investment Strategies

The Advisor adheres to a bottom-up, relative value investment process when selecting publicly traded real estate securities. To guide the portfolio construction process, the Advisor utilizes a proprietary valuation model that quantifies relative valuation of real estate securities based on price-to-net asset value ("NAV"), cash flow multiple/growth ratios and a dividend discount model ("DDM"). Analysts incorporate both quantitative and qualitative analysis in their NAV, cash flow, growth and DDM estimates. The company research process includes an evaluation of the commercial real estate supply and demand dynamics, management, strategy, property quality, financial strength and corporate structure. Judgments with respect to risk control, geographic and property sector diversification, liquidity and other factors are considered along with the models' output and drive the portfolio managers' investment decisions. The Fund will not seek to achieve specific environmental, social and governance ("ESG") outcomes through its portfolio of investments, nor will it pursue an overall impact or sustainable investment strategy. However, the Advisor may incorporate consideration of relevant ESG factors into its investment decision-making.

Under normal market conditions, the Fund invests at least 80%, and normally substantially all, of its total assets in common stocks and other equity securities issued by real estate companies. Real estate equity securities include common stocks, preferred stocks and other equity securities issued by real estate companies, including real estate investment trusts ("REITs") and similar REIT-like entities. A real estate company is one that (i) derives at least 50% of its revenue from the ownership, construction, financing, management or sale of commercial, industrial or residential real estate and land; or (ii) has at least 50% of its assets invested in such real estate. REITs are companies that own interests in real estate or in real estate related loans or other interests, and their revenue primarily consists of rent derived from owned, income producing real estate properties and capital gains from the sale of such properties. The Fund may invest, without limit, in shares of REITs. A REIT in the U.S. is generally not taxed on income distributed to shareholders so long as it meets certain tax related requirements, including the requirement that it distribute substantially all of its taxable income to such shareholders (other than net capital gains for each taxable year). Foreign REITs and REIT-like entities are organized outside of the U.S. and have operations and receive tax treatment in their respective countries similar to that of U.S. REITs. The Fund retains the ability to invest in real estate companies of any market capitalization.

The Fund may invest up to 20% of its total assets in securities of foreign issuers (including emerging market issuers) which meet the same criteria for investment as domestic companies, including investments in such companies in the form of American Depositary Receipts ("ADRs"), Global Depositary Receipts ("GDRs") and European Depositary Receipts ("EDRs").

Principal Risks of Investing in the Fund

Before investing, be sure to read the additional descriptions of these risks in the full statutory prospectus.

Investment Risk

An investment in the Fund is subject to investment risk, including the possible loss of the entire principal amount that you invest.

Market Risk

Your investment in Fund shares represents an indirect investment in the REIT shares and other securities owned by the Fund. The value of these securities, like other investments, may move up or down, sometimes rapidly and unpredictably. Your Fund shares at any point in time may be worth less than what you invested, even after taking into account the reinvestment of Fund dividends and distributions.

Common Stock Risk

Common stocks are subject to special risks. Although common stocks have historically generated higher average returns than fixed-income securities over the long-term, common stocks also have experienced significantly more volatility in returns. Common stocks may be more susceptible to adverse changes in market value due to issuer specific events or general movements in the equities markets. A drop in the stock market may depress the price of common stocks held by the Fund. Common stock prices fluctuate for many reasons, including changes to investors' perceptions of the financial

condition of an issuer or the general condition of the relevant stock market, or the occurrence of political or economic events affecting issuers. For example, an adverse event, such as an unfavorable earnings report, may depress the value of common stock in which the Fund has invested; the price of common stock of an issuer may be particularly sensitive to general movements in the stock market; or a drop in the stock market may depress the price of most or all of the common stocks held by the Fund. Also, common stock of an issuer in the Fund's portfolio may decline in price if the issuer fails to make anticipated dividend payments because, among other reasons, the issuer of the security experiences a decline in its financial condition. The common stocks in which the Fund will invest are typically subordinated to preferred securities, bonds and other debt instruments in a company's capital structure in terms of priority to corporate income and assets, and, therefore, will be subject to greater risk than the preferred securities or debt instruments of such issuers. In addition, common stock prices may be sensitive to rising interest rates as the costs of capital rise and borrowing costs increase.

Real Estate Market Risk

Since the Fund concentrates its assets in companies engaged in the real estate industry, your investment in the Fund will be closely linked to the performance of the real estate markets. Property values may fall due to increasing vacancies or declining rents resulting from unanticipated economic, legal, cultural or technological developments. Real estate company prices also may drop because of the failure of borrowers to pay their loans and poor management, and residential developers, in particular, could be negatively impacted by falling home prices, slower mortgage origination and rising construction costs.

REIT Risk

In addition to the risks of securities linked to the real estate industry, REITs are subject to certain other risks related to their structure and focus. REITs generally are dependent upon management skills and may not be diversified. REITs are also subject to heavy cash flow dependency, defaults by borrowers and self-liquidation. In addition, REITs could possibly fail to (i) qualify for favorable tax treatment under applicable tax law, or (ii) maintain their exemptions from registration under the Investment Company Act of 1940 (the "1940 Act"). The above factors may also adversely affect a borrower's or a lessee's ability to meet its obligations to the REIT. In the event of a default by a borrower or lessee, the REIT may experience delays in enforcing its rights as a mortgagee or lessor and may incur substantial costs associated with protecting its investments.

Foreign (Non-U.S.) Securities Risk

Risks of investing in foreign securities, which can be expected to be greater for investments in emerging markets, include currency risks, future political and economic developments, including but not limited to, international wars or conflicts (including Russia's military invasion of Ukraine), instability in regions such as Asia, Eastern Europe and the Middle East, terrorism, natural disasters and public health emergencies (including epidemics and pandemics), and possible imposition of foreign withholding or other taxes on income or proceeds payable on the securities (including trading and tariff arrangements and restrictions, sanctions and cybersecurity attacks). In addition, there may be less publicly available information about a foreign issuer than about a domestic issuer, and foreign issuers may not be subject to the same accounting, auditing and financial recordkeeping standards and requirements as domestic issuers.

Small- and Medium-Sized Companies Risk

Companies in the real estate industry tend to be small- to medium-sized companies in relation to the equity markets as a whole. There may be less trading in a smaller company's stock, which means that buy and sell transactions in that stock could have a larger impact on the stock's price than is the case with larger company stocks. Smaller companies also may have fewer lines of business so that changes in any one line of business may have a greater impact on a smaller company's stock price than is the case for a larger company. Further, smaller company stocks may perform differently in different cycles than larger company stocks. Accordingly, real estate company shares can, and at times will, perform differently than large company stocks.

Preferred Securities Risk

There are various risks associated with investing in preferred securities. These risks include deferral and omission of distributions; credit risk; subordination to bonds and other debt securities in a company's capital structure; interest rate risk; prepayment and extension risk; call, reinvestment and income risk; liquidity risk; limited voting rights; and special redemption rights.

Active Management Risk

As an actively managed portfolio, the value of the Fund's investments could decline because the financial condition of an issuer may change (due to such factors as management performance, reduced demand or overall market changes), financial markets may fluctuate or overall prices may decline, or the Advisor's investment techniques could fail to achieve the Fund's investment objective or negatively affect the Fund's investment performance.

Non-Diversification Risk

As a "non-diversified" investment company, the Fund can invest in fewer individual companies than a diversified investment company. As a result, the Fund is more susceptible to any single political, regulatory or economic occurrence and to the financial condition of individual issuers in which it invests. The Fund's relative lack of diversity may subject investors to greater risk of loss than a fund that has a diversified portfolio.

Market Disruption and Geopolitical Risk

Geopolitical events, such as war (including ongoing conflicts in Ukraine and the Middle East), terrorist attacks, natural or environmental disasters (including hurricanes, wildfires and flooding), country instability, public health emergencies (including epidemics and pandemics), market instability, debt crises and downgrades, embargoes, tariffs, sanctions and other trade barriers and other governmental trade or market control programs, the potential exit of a country from its respective union and related geopolitical events, have led and may in the future lead to market volatility and may have long-lasting impacts on U.S. and global economies and financial markets. Supply chain disruptions or significant changes in the supply or prices of commodities or other economic inputs may have material and unexpected effects on both global securities markets and individual countries, regions, sectors, companies or industries. Events occurring in one region of the world may negatively impact industries and regions that are not otherwise directly impacted by the events. Additionally, those events, as well as other changes in foreign and domestic political and economic conditions, could adversely affect individual issuers or related groups of issuers, securities markets, interest rates, secondary trading, credit ratings, inflation, investor sentiment and other factors affecting the value of the Fund's investments.

Russia's military invasion of Ukraine significantly amplified already existing geopolitical tensions. The United States and many other countries have instituted various economic sanctions against Russia, Russian individuals and entities and Belarus. The extent and duration of the military action, sanctions imposed and other punitive actions taken (including any Russian retaliatory responses to such sanctions and actions), and resulting disruptions in Europe and globally cannot be predicted, but could be significant and have a severe adverse effect on the global economy, securities markets and commodities markets globally, including through global supply chain disruptions, increased inflationary pressures and reduced economic activity.

Ongoing conflicts in the Middle East could have similar negative impacts. The possibility of a prolonged conflict and the potential expansion of the conflict in the surrounding areas and the involvement of other nations in such conflict could further destabilize the Middle East region and introduce new uncertainties in global markets, including the oil and natural gas markets.

Systemic risk events in the financial sectors and/or resulting government actions can negatively impact investments held by the Fund. For example, issues with certain regional U.S. banks and other financial institutions in March 2023 raised economic concerns over disruption in the U.S. banking system. These risks also may adversely affect financial intermediaries, such as clearing agencies, clearing houses, banks, securities firms, and exchanges, with which the Fund interacts. There can be no certainty that any actions taken by the U.S. government to strengthen public confidence in the U.S. banking system or financial markets will be effective in mitigating the effects of financial institution failures on the economy and restoring or maintaining public confidence. In addition, raising the U.S. Government debt ceiling has become increasingly politicized. Any failure to increase the total amount that the U.S. Government is authorized to borrow could lead to a default on U.S. Government obligations. A default or a threat of default by the U.S. Government would be highly disruptive to the U.S. and global securities markets and could significantly reduce the value of the Fund's investments.

The strengthening or weakening of the U.S. dollar relative to other currencies may, among other things, adversely affect the Fund's investments denominated in non-U.S. dollar currencies. It is difficult to predict when similar events affecting the U.S. or global financial markets may occur, the effects that such events may have, and the duration of those effects.

The rapid development and increasingly widespread use and regulation of artificial intelligence including machine learning technology and generative artificial intelligence such as ChatGPT (collectively, "AI Technologies"), may pose risks to the Fund. For instance, the rapid advanced development of AI Technologies and efforts to regulate or control its use and advancement may have significant positive or negative impacts on a wide range of different industries and the global economy. It is not possible to predict which companies, sectors, or economies may benefit or be disadvantaged by such developments, or is it possible to determine the full extent of current or future risks related thereto.

Some political leaders around the world (including in the U.S. and certain European nations) have been and may be elected on protectionist platforms, raising questions about the future of global free trade. Global trade disruption, significant introductions of trade barriers and bilateral trade frictions, together with any future downturns in the global economy resulting therefrom, could adversely affect the financial performance of the Fund and its investments.

Regulatory Risk

Legal and regulatory developments may adversely affect the Fund. The regulatory environment for the Fund is evolving, and changes in the regulation of investment funds and other financial institutions or products (such as banking or insurance products), and their trading activities and capital markets, or a regulator's disagreement with the Fund's interpretation of the application of certain regulations, may adversely affect the ability of the Fund to pursue its investment strategy, its ability to obtain leverage and financing, and the value of investments held by the Fund. The U.S. government has proposed and adopted multiple regulations that could have a long-lasting impact on the Fund and on the fund industry in general. These regulations or any laws and regulations that may be adopted in the future may restrict the Fund's ability to engage in transactions or raise additional capital and/or increase overall expenses of the Fund.

Additional legislative or regulatory actions may alter or impair certain market participants' ability to utilize certain investment strategies and techniques.

The Fund and the instruments in which it invests may be subject to new or additional regulatory constraints in the future. While the full extent of all of these regulations is still unclear, these regulations and actions may adversely affect both the Fund and the instruments in which the Fund invests and its ability to execute its investment strategy. For example, climate change regulation (such as decarbonization legislation, other mandatory controls to reduce emissions of greenhouse gases, or related disclosure requirements) could significantly affect the Fund or its investments by, among other things, increasing compliance costs or underlying companies' operating costs and capital expenditures. Similarly, regulatory developments in other countries may have an unpredictable and adverse impact on the Fund.

Cyber Security Risk

With the increased use of technologies such as the Internet and the dependence on computer systems to perform necessary business functions, the Fund and its service providers (including the Advisor) may be susceptible to operational and information security risks resulting from cyber-attacks and/or other technological malfunctions. In general, cyber-attacks are deliberate, but unintentional events may have similar effects. Cyber-attacks include, among others, stealing or corrupting data maintained online or digitally, preventing legitimate users from accessing information or services on a website or company system, misappropriating or releasing confidential information without authorization, gaining unauthorized access to digital systems for purposes of misappropriating assets and causing operational disruption. Cyber-attacks may also be carried out in a manner that does not require gaining unauthorized access, such as causing denial-of-service. Successful cyber-attacks against, or security breakdowns of, the Fund, the Advisor, or a custodian, transfer agent, or other affiliated or third-party service provider may adversely affect the Fund or its shareholders. For instance, cyber-attacks may interfere with the processing of shareholder transactions, affect the Fund's ability to calculate its NAV, cause the release of private shareholder information or confidential Fund information, impede trading, cause reputational damage, and subject the Fund to regulatory fines, penalties or financial losses, reimbursement or other compensation costs, and additional compliance costs. Furthermore, as a result of breaches in cyber security or other operational and technology disruptions or failures, an exchange or market may close or issue trading halts on specific securities or an entire market, which may result in a Fund being, among other things, unable to buy or sell certain securities or financial instruments or unable to accurately price its investments. While the Fund has established business continuity plans and systems designed to detect and prevent cyber-attacks, there are inherent limitations in such plans and systems including the possibility that certain risks have not been identified. Similar types of cyber security risks also are present for issuers of securities in which the Fund invests, which could result in material adverse consequences for such issuers, and may cause the Fund's investment in such securities to lose value.

Each of the Fund and the Advisor may have limited ability to detect and prevent or mitigate cyber-attacks or security or technology breakdowns affecting the Fund's third-party service providers. While the Fund has established business continuity plans and systems designed to detect and prevent or reduce the impact of cyber-attacks, such plans and systems are subject to inherent limitations.

Shareholder Concentration Risk

The Fund may have one or more large shareholders or a group of shareholders investing in classes of Fund shares indirectly through an account, platform or program sponsored by a financial institution. In addition, a large number of shareholders collectively may purchase or redeem Fund shares in large amounts rapidly or unexpectedly (collectively, such transactions are referred to as "large shareholder transactions"). Investment and asset allocation decisions by such financial institutions regarding the account, platform or program through which multiple shareholders invest may result in

subscription and redemption decisions that have a significant impact on the assets, expenses and trading activities of the Fund. Such a decision may cause the Fund to sell assets (or invest cash) at disadvantageous times or prices, increase or accelerate taxable income and/or gains or transaction costs and may negatively affect the Fund's NAV, performance, or ability to satisfy redemptions in a timely manner. The effects of taxable income and/or gains resulting from large shareholder transactions would particularly impact non-redeeming shareholders who do not hold their Fund shares in an IRA, 401(k) plan or other tax-advantaged plan. The Fund may hold a relatively large proportion of its assets in cash in anticipation of large redemptions, diluting its investment returns. A number of circumstances may cause a Fund to experience large redemptions, such as changes in investors' circumstances; changes in the eligibility criteria for a Fund or share class of the Fund; liquidations, reorganizations, repositionings, or other announced Fund events; or changes in investment objectives, strategies, policies, risks, or investment personnel.

Other Investment Companies Risk

To the extent the Fund invests a portion of its assets in investment companies, including open-end funds, closed-end funds, exchange-traded funds ("ETFs") and other types of pooled investment funds, those assets will be subject to the risks of the purchased investment funds' portfolio securities, and a shareholder in the Fund will bear not only his or her proportionate share of the Fund's expenses, but also indirectly the expenses of the purchased investment funds. Shareholders would therefore be subject to duplicative expenses to the extent the Fund invests in other investment funds. Risks associated with investments in closed-end funds also generally include market risk, leverage risk, risk of market price discount from NAV, risk of anti-takeover provisions and non-diversification risk. In addition, restrictions under the 1940 Act may limit the Fund's ability to invest in other investment companies to the extent desired.

Rule 12d1-4 and other applicable rules under Section 12(d)(1) of the 1940 Act, permit an investment company to invest in other investment companies beyond the statutory limits, subject to certain conditions. This could affect the Fund's ability to redeem its investments in other investment companies, make such investments less attractive, cause the Fund to incur losses, realize taxable gains distributable to shareholders, incur greater or unexpected expenses or experience other adverse consequences.

Your investment in the Fund is not a deposit of any bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation ("FDIC") or any other government agency.

Fund Performance

The following bar chart and table provide some indication of the risks of investing in the Fund. The bar chart shows changes in the Fund's performance from year to year. The table shows how the Fund's average annual returns compare with the performance of a selected broad-based market index, the S&P 500 Index, over various time periods. The S&P 500 Index is an unmanaged index of common stocks that is frequently used as a general measure of U.S. stock market performance. In addition to the broad-based market index, the table shows performance of a linked benchmark (the "Linked Benchmark"). The Linked Benchmark is represented by the performance of the FTSE Nareit Equity REITs Index through March 31, 2019 and the FTSE Nareit All Equity REITs Index thereafter. The FTSE Nareit Equity REITs Index contains all tax-qualified real estate investment trusts (REITs) except timber and infrastructure REITs with more than 50% of total assets in qualifying real estate assets other than mortgages secured by real property that also meet minimum size and liquidity criteria. The FTSE Nareit All Equity REITs Index contains all tax-qualified REITs with more than 50% of total assets in qualifying real estate assets other than mortgages secured by real property that also meet minimum size and liquidity criteria. The Advisor believes that this index, as compared to the broad-based market index, is comprised of securities that are more representative of the Fund's investment strategy.Past performance (both before and after taxes) is not, however, an indication as to how the Fund may perform in the future. Updated performance information, including the Fund's NAV per share, is available at www.cohenandsteers.com or by calling (800) 330-7348.

Cohen & Steers Institutional Realty Shares, Inc.
Annual Total Returns

  

Highest quarterly return during this period:	17.15%	quarter ended	March 31, 2019
Lowest quarterly return during this period:	-22.80%	quarter ended	March 31, 2020

Average Annual Total Returns

(for the periods ended December 31, 2024) 

	1 Year	5 Years	10 Years
Return Before Taxes	6.24 %	4.58 %	6.70 %
Return After Taxes on Distributions	5.5 %	3.48 %	4.68 %
Return After Taxes on Distributions and Sale of Fund Shares	3.87 %	3.28 %	4.64 %
Linked Benchmark (reflects no deduction for fees, expenses or taxes)	4.92 %	3.29 %	5.37 %
S&P 500 Index (reflects no deduction for fees, expenses or taxes)	25.02 %	14.52 %	13.10 %

After-tax returns 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 the investor's tax situation and may differ from those shown, and the after-tax returns shown are not relevant to investors who hold their shares through tax-advantaged arrangements such as 401(k) plans or individual retirement accounts.

Investment Management

Advisor

Cohen & Steers Capital Management, Inc.

Portfolio Managers

The Fund's portfolio managers are:

Jason Yablon-Executive Vice President of the Advisor. Mr. Yablon has been a portfolio manager of the Fund since 2013.

Mathew Kirschner-Senior Vice President of the Advisor. Mr. Kirschner has been a portfolio manager of the Fund since 2020.

Jon Cheigh-President and Chief Investment Officer of the Advisor. Mr. Cheigh has been a portfolio manager of the Fund since 2012.

Ji Zhang-Senior Vice President of the Advisor. Ms. Zhang has been a portfolio manager of the Fund since 2024.

Purchase and Sale of Fund Shares

You may open an account with the Fund with a minimum investment of $1,000,000 (aggregate for registered advisors). Additional investments must be at least $10,000. The Fund reserves the right to waive or change its minimum investment requirements.

You may purchase, redeem or exchange shares of the Fund on any business day, which is any day the New York Stock Exchange ("NYSE") is open for business, by written request, wire transfer (call (800) 437-9912 for instructions) or telephone. You may purchase, redeem or exchange shares of the Fund either through a financial intermediary or directly through Cohen & Steers Securities, LLC, the Fund's distributor (the "Distributor"). For accounts opened directly through the Distributor, a completed and signed Subscription Agreement is required for the initial account opened with the Fund.

Please mail the signed Subscription Agreement to:

SS&C GIDS, Inc.
Cohen & Steers Funds
P.O. Box 219953
Kansas City, MO 64121-9953
Phone: (800) 437-9912

Tax Information

The Fund's distributions may be comprised of taxable ordinary income, taxable capital gains and/or a non-taxable return of capital, unless you are investing through a tax-advantaged arrangement, such as a 401(k) plan or an individual retirement account. Investments through such tax-advantaged arrangements may be taxed upon withdrawal of monies from the tax-advantaged arrangement.

Payments to Broker-Dealers and Other Financial Intermediaries

If you purchase shares of the Fund through a broker-dealer or other financial intermediary (such as a bank), the Fund and/or its Advisor or Distributor 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 individual financial representative to recommend the Fund over another investment. Ask your individual financial representative or visit your financial intermediary's website for more information.

(REMAINDER OF PAGE INTENTIONALLY LEFT BLANK)