Institutional Shareholder Services (ISS), a major provider of proxy advisory services, is facing an enforcement action from the US Securities and Exchange Commission (SEC) after allegedly refusing to produce documents requested by the regulator. The SEC filed its action on September 4, 2026, in the US District Court for the Eastern District of Pennsylvania, seeking to compel ISS to comply with a subpoena issued in July 2026.
SEC takes aim at ISS over subpoena dispute
The SEC stated that its examination staff first made routine information requests to ISS, but the firm reportedly declined to provide full compliance. In response, the SEC issued an administrative subpoena on July 21, 2026, demanding records related to ISS’s compliance with federal securities laws.
According to the agency, ISS has continued to withhold certain requested documents, which the SEC claims has delayed its examination and oversight activities. The Commission described itself as the primary regulator for ISS, which is registered as an investment adviser with the SEC.
In its filing, the SEC argued that the requested records are critical to its statutory responsibilities, including investor protection and regulatory oversight. The case does not address the substance of ISS’s proxy recommendations but focuses strictly on gathering information for evaluation of the firm’s adherence to securities regulations.
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The SEC is seeking a court order to enforce its demand for outstanding records from ISS, citing the company’s continued refusal to fully comply with an administrative subpoena issued as part of a securities law investigation.
Mini dictionary: Proxy advisory service, an industry that provides recommendations to institutional investors on how to vote their shares in corporate elections. ISS and Glass Lewis are leading firms in this sector, offering research and advice on shareholder voting for publicly traded companies.
Regulatory spotlight on ISS’s market influence
The enforcement move has renewed focus on the influence wielded by ISS in shareholder voting at public companies. According to Bloomberg ETF analyst Eric Balchunas, ISS currently controls around half of the proxy voting outsourcing market. He cited the firm’s significant impact on corporations, including its promotion of environmental, social, and governance (ESG) standards.
Eric Balchunas noted that ISS, which controls a substantial portion of the proxy voting market, has been known to push ESG initiatives on corporations, highlighting the broader regulatory attention now being paid to proxy advisory firms.
Further discussion from Matthew Sigel, Head of Digital Assets Research at VanEck, expanded the topic to concentration among leading proxy advisers and referenced Glass Lewis, another major industry player. Sigel remarked that VanEck portfolio managers must justify any decision to override Glass Lewis recommendations, placing both ISS and Glass Lewis at the center of debates over influence on corporate governance.
Both ISS and Glass Lewis offer advice to institutional investors ahead of shareholder votes, and their recommendations can shape outcomes in corporate elections. The case involving ISS centers on document compliance, but it points to broader questions regarding the role and oversight of firms with significant proxy influence.
| Firm | Market Share | Key Focus Areas |
|---|---|---|
| ISS | About 50% | Proxy voting, ESG guidance |
| Glass Lewis | About 30% | Proxy voting, board diversity |
Tesla CEO Elon Musk has previously criticized the outsized influence of proxy advisers and the role of passive fund structures in shaping corporate policy. The current legal dispute, however, remains centered on the procedural matter of ISS’s response to federal information requests.
Court proceedings are expected to determine whether ISS must provide the remaining documents as required by the July subpoena. The SEC continues to cite its mandate to protect investors and maintain fair markets in urging the release of the requested information.
