Private company

Institutional Shareholder Services

Logo: ISS governance, Public domain, via Wikimedia Commons3

Proxy advisory firm

Institutional Shareholder Services Inc. (ISS) is an American proxy advisory firm. Hedge funds, mutual funds and similar organizations that own shares of multiple companies pay ISS to advise (and often vote their shares) regarding share holder votes. As the leading firm in the industry, ISS commands a 48 percent market share as of 2021, with its nearest rival, Glass Lewis, holding a 42 percent market share.2 Wikipedia text CC BY-SA 4.0

Last updated Oct 21, 2026.

Overview

Institutional Shareholder Services Inc. (ISS) is an American proxy advisory firm. Hedge funds, mutual funds and similar organizations that own shares of multiple companies pay ISS to advise (and often vote their shares) regarding share holder votes. As the leading firm in the industry, ISS commands a 48 percent market share as of 2021, with its nearest rival, Glass Lewis, holding a 42 percent market share.2

Corporate structure

Institutional Shareholder Services is part of a group headed by Deutsche Börse. 109 entities, 28 countries on record. Switch between the flow chart and the network, and select any entity to see its details.

  • Deutsche Börse Eschborn, Germany
    • 360 Treasury Systems Frankfurt am Main, Germany
    • Clearstream Banking SA Luxembourg, Luxembourg
    • CLEARSTREAM FUND CENTRE S.A. Luxembourg, Luxembourg
    • Crypto Finance AG Zürich, Switzerland
    • EURO STOXX 50 Zug, Switzerland
    • European Energy Exchange Leipzig, Germany
      • European Commodity Clearing AG Leipzig, Germany
      • EEX ASIA PTE. LTD. Subsidiary · Singapore, Singapore
      • EEX Link GmbH Subsidiary · Leipzig, Germany
      • European Commodity Clearing Luxembourg S.ar.l. (European Commodity Clearing Luxembourg S.àr.l.) Subsidiary · Luxembourg, Luxembourg
      • European Energy Exchange - Non-MTF Market Subsidiary · Germany
      • European Energy Exchange - OTF Gas Market Subsidiary · Germany
      • European Energy Exchange - Regulated Gas Market Subsidiary · Leipzig, Germany
      • European Energy Exchange - Regulated Market Subsidiary · Leipzig, Germany
      • NODAL EXCHANGE, LLC Subsidiary · Vienna, Virginia, United States
        • NODAL CLEAR, LLC Subsidiary · Tysons Corner, Virginia, United States
    • SimCorp København S, Denmark
      • Axioma Inc. Subsidiary · New York, New York, United States
      • SCIM SDN. BHD. Subsidiary · Kuala Lumpur W.P., Malaysia
      • SimCorp Asia PTY Ltd. Subsidiary · Sydney, Australia
      • SimCorp Austria GmbH Subsidiary · Wien, Austria
      • SimCorp Benelux SA/NV Subsidiary · Brussel, Belgium
        • SimCorp Netherlands Branch · Brussel, Belgium
      • SimCorp Canada Inc. Subsidiary · Vancouver, Quebec, Canada
      • SIMCORP CORIC LIMITED Subsidiary · London, United Kingdom
      • SimCorp France S.A.S. Subsidiary · Paris, France
      • SIMCORP GmbH Subsidiary · Bad Homburg vor der Höhe, Germany
      • SimCorp Hong Kong Ltd. Subsidiary · Wanchai, Hong Kong
      • SIMCORP IBERIA S.L. Subsidiary · Barcelona, Spain
      • SimCorp India LLP Subsidiary · Gautam Buddha Nagar, Noida, India
      • SIMCORP LIMITED Subsidiary · London, United Kingdom
        • "SIMCORP LIMITED" SIRKTININ AZRBAYCAN RESPUBLIKASINDAKl FILIALI Branch · London, United Kingdom
        • symkwrb lymtd - abwzby (سيمكورب ليمتد - ابوظبي) Branch · London, United Kingdom
      • SimCorp Luxembourg S.a r.l. (SimCorp Luxembourg S.à r.l.) Subsidiary · Luxembourg, Luxembourg
      • SIMCORP NORGE AS Subsidiary · Oslo, Norway
      • SimCorp Schweiz AG Subsidiary · Zürich, Switzerland
      • SimCorp Singapore Pte. Ltd. Subsidiary · Singapore, Singapore
        • simkopeusing-gapoleupitiieltidi(yeong-eobso) (심코프싱가포르피티이엘티디(영업소)) Branch · Singapore, Singapore
      • SIMCORP SPOLKA Z OGRANICZONA ODPOWIEDZIALNOSCIA (SIMCORP SPÓŁKA Z OGRANICZONĄ ODPOWIEDZIALNOŚCIĄ) Subsidiary · Warszawa, Poland
      • SimCorp Sverige AB Subsidiary · Stockholm, Sweden
        • SimCorp Sverige AB filial i Finland Branch · Stockholm, Sweden
      • SimCorp TalentCo ApS Subsidiary · Copenhagen S, Denmark
      • SimCorp USA Inc. Subsidiary · New York, New York, United States
      • SimCorp Japan株式会社 Subsidiary · 東京都, Japan
      • sym kwrb dh.m.m (سيم كورب ذ.م.م) Branch · København S, Denmark
      • symkwrb lymtd - fr dby (سيمكورب ليمتد - فرع دبي) Branch · København S, Denmark
    • Clearstream Subsidiary · Luxembourg
    • DAX Subsidiary · Frankfurt
    • Deutsche Börse Cloud Exchange AG Subsidiary · Eschborn
    • EuroCTP Subsidiary · Amsterdam
    • Power Exchange Central Europe Subsidiary · Praha 1, Czechia
    • Stoxx Limited Subsidiary · Zurich
      • Stoxx Limited - Customized Indices Subsidiary · Switzerland
      • Stoxx Limited - Indices Subsidiary · Switzerland
      • Stoxx Limited - Volatility Indices Subsidiary · Switzerland
    • Iss Stoxx Gmbh
      • Iss Holdco Inc.
        • Institutional Shareholder Services
    • INSTITUTIONAL SHAREHOLDER SERVICES EUROPE Subsidiary · 80.31% · Watermael-Boitsfort, Belgium
    • 360 Trading Networks Inc. Subsidiary · New York City, New York, United States
    • 360 TRADING NETWORKS UK LIMITED Subsidiary · London, United Kingdom
    • 360T Subsidiary · Germany
    • 360T ASIA PACIFIC PTE. LTD. Subsidiary · Singapore, Singapore
    • 360TGTX Inc. Subsidiary · New York, New York, United States
    • Axioma (HK) Ltd Subsidiary · Wanchai, Hong Kong
    • Axioma Argentina S.A.U Subsidiary · Buenos Aires, Argentina
    • Boerse Frankfurt - Freiverkehr Subsidiary · Germany
    • Boerse Frankfurt - Scale Subsidiary · Germany
    • Boerse Frankfurt – Freiverkehr– Off-Book Subsidiary · Germany
    • and 36 more

Built from parent and subsidiary links from GLEIF, the Global Legal Entity Identifier Foundation (CC0); subsidiaries, stakes and holdings from Wikidata (CC0); owners and owned firms from Form ADV, the registration investment advisers file with the SEC. Each entity in the chart links to its source.

Investment adviser

Institutional Shareholder Services is registered with the SEC as an investment adviser. This is what it reports on Form ADV, the registration every adviser files and keeps current.

  • Employees3,350 1,762 in investment advice or research
  • ClientsBanking or thrift institutions: 186; Investment companies: 45; Pooled investment vehicles (other than investment companies and: 307; Pension and profit sharing plans (but not the plan participants or: 174; Charitable organizations: 45; State or municipal government entities (including government pension: 19; Other investment advisers: 1,047; Insurance companies: 80; Sovereign wealth funds and foreign official institutions: 12; Corporations or other businesses not listed above: 78; Other: ACADEMIC,VENDOR, OTHER COMPANIES NOT ABLE TO: 253
  • How it is paidSubscription fees (for a newsletter or periodical); Fixed fees (other than subscription fees); Other: PER PROXY ANALYSIS AND PROXY VOTE; ASSET-BASED ON ESG PRODS.
  • What it doesPension consulting services; Publication of periodicals or newsletters; Security ratings or pricing services; Other: PROXY ANALYSIS, PROXY VOTING RECOMMENDATIONS, PROXY RESEARCH AND PORTFOLIO SCREENING PRODUCTS, ESG
  • Holds client assetsNo
  • RegistrationSEC 801-55092, CRD 111940 IAPD record

Who owns it

Owners of 5% or more as the firm lists them (Schedule A), and the owners of those owners up the chain (Schedule B).

  • ISS HOLDCO INC.owns 75% or more, since 02/2021
  • DEUTSCHE BÖRSE AGowns 75% or more of ISS STOXX GMBH, since 02/2021
  • ISS STOXX GMBHowns 75% or more of ISS HOLDCO INC., since 11/2023

Disciplinary record

Each event as the firm describes it on its Disclosure Reporting Pages:

Civil Judicial Action · Nov 20, 2025 · pending

Allegations: THE COMPLAINT ALLEGES THAT ISS AND ANOTHER PROXY ADVISER/CO-DEFENDANT HAVE ENGAGED IN DECEPTIVE TRADE PRACTICES AND UNFAIR CONDUCT ARISING IN CONNECTION WITH THE PROVISION OF PROXY ADVICE TO FLORIDA RESIDENTS THAT INCLUDES ESG AND DEI-RELATED CONTENT.

Sanction: Injunction

Civil Judicial Action · May 20, 2026 · pending

Allegations: THE COMPLAINT ALLEGES THAT ISS HAS ENGAGED IN DECEPTIVE AND UNFAIR TRADE PRACTICES IN CONNECTION WITH THE PROVISION OF PROXY ADVICE THAT INCLUDES ESG RELATED CONTENT.

Sanction: Injunction

Civil Judicial Action · May 20, 2026 · pending

Allegations: THE COMPLAINT ALLEGES THAT ISS HAS ENGAGED IN DECEPTIVE TRADE PRACTICES AND UNFAIR PRACTICES IN CONNECTION WITH THE PROVISION OF PROXY ADVICE TO IOWA'S RESIDENTS THAT INCLUDES ESG AND DEI-RELATED CONTENT

Sanction: Injunction

Civil Judicial Action · May 20, 2026 · pending

Allegations: THE COMPLAINT ALLEGES THAT ISS HAS ENGAGED IN DECEPTIVE TRADE PRACTICES AND UNFAIR PRACTICES IN CONNECTION WITH THE PROVISION OF PROXY ADVICE TO WEST VIRGINIA'S RESIDENTS THAT INCLUDES ESG-RELATED CONTENT.

Sanction: Injunction

The story

ISS was founded in 1985.

With Disney announcing the combination of the CEO and chairman positions on October 6, 2011, past the date of shareholder proposal deadline, and increase CEO/chair pay, ISS called for a no vote against the four Nominating and Governance Committee board members at the 2012 annual meeting. ISS recommended to clients two candidates nominated by billionaire investor Carl Icahn to the drugmaker Forest Laboratories’ board of directors in a 2012 proxy contest.

In 2013, ISS agreed to pay the SEC a fine of $300,000 and retain an independent compliance consultant to settle charges that it failed to safeguard the confidential proxy voting information of clients. ISS was highlighted in a 2014 opinion piece in the New York Times by Cornell University law professor Lynn Stout as having an outsized power in the selection of CEOs of major corporations in the United States with ramifications for the U.S. economy. It was owned by MSCI until April 30, 2014 when it was purchased by Vestar Capital Partners.

Ethix SRI Advisors was purchased by ISS to help ISS expand into Europe. Ethix was renamed with the acquisition to ISS-Ethix and would lead ISS's sustainable and responsible investment activities.

In 2017, ownership of ISS switched to Genstar Capital. In March 2018, ISS also acquired the German ESG rating agency oekom research AG. In November 2020, Deutsche Börse announced the acquisition of a majority in ISS-shares for about 1.5 billion Euro.

Acquisitions

In September 2015, ISS acquired Ethix SRI Advisors, a provider of sustainable and responsible investment (SRI) research and solutions such as corporate engagement, screening, monitoring and assessing companies’ performance.

In January 2017, ISS acquired IW Financial, a U.S.-based firm offering environmental, social, and governance (ESG) research, consulting, and portfolio management solutions.

In June 2017, ISS acquired Climate Neutral Investments (CNI), the Investment Climate Data division of the South Pole Group.

Read the full text

In February 2018, ISS acquired EVA Dimensions, a provider of cash-flow-based analysis of corporate performance.

In March 2018, ISS acquired oekom AG, a provider of environmental, social, and governance (ESG) ratings and data.

In February 2019, ISS acquired CAER, a Canberra-based research company that has worked with institutional investors seeking to monitor portfolio companies’ ESG policies, practices, and disclosures since 2000.

In October 2020, ISS acquired FICO Cyber Risk Score Business, which helps organizations in their efforts to measure, manage and reduce cyber risk.

In February 2021, ISS acquired ACRe Data, a provider of ESG Scoring for the U.S. Municipal marketplace.

From Wikipedia’s article on Institutional Shareholder Services, shared under CC BY-SA 4.0.4