DOL’s April 2026 designation of ISS and Glass Lewis as potential ERISA fiduciaries has fractured the governance model that Fortune 500 boards have relied on for two decades. As the 2026 proxy season closes with ISS influence on S&P 500 Say on Pay votes at a five-year low (22.6 percentage points, compared to 29.9 in 2021), boards that managed institutional investor relationships through proxy advisor recommendations now operate with no reliable filter between their governance decisions and direct institutional judgment. The board that builds direct engagement architecture before the next proxy cycle captures the governance premium; the board that defers inherits an unmanaged gap.
PRIORITY 9 | SILO: Institutional
DOL Technical Release 2026-01 (April 15, 2026) designated proxy advisory firms as potential ERISA fiduciaries, requiring pension funds to vote exclusively to maximize risk-adjusted return, not for policy preferences.
The Signal
On April 15, 2026, the U.S. Department of Labor issued Technical Release 2026-01, implementing the December 2025 Executive Order directing federal agencies to review ISS and Glass Lewis, which together control over 90% of the proxy advisory market. The Technical Release established that proxy advisory firms providing individualized voting advice to ERISA plans on a regular basis will generally qualify as investment advice fiduciaries under the five-part test. DOL stated that proxy vote management must be undertaken for the exclusive purpose of maximizing risk-adjusted return on investment, not for any legislative, regulatory, or public policy objective.
The 2026 proxy season confirmed the structural effect immediately. Semler Brossy’s analysis, published in the Harvard Law School Forum on Corporate Governance on June 13, 2026, documented that ISS’s influence differential for S&P 500 Say on Pay votes fell from 29.9 percentage points in 2021 to 22.6 percentage points in 2026. Multiple major institutional investor groups publicly announced independent stewardship frameworks, decoupling their voting behavior from proxy advisor recommendations for the first time at scale.
The Evidence
U.S. Department of Labor, Technical Release 2026-01, April 15, 2026: Proxy advisory firms may qualify as ERISA investment advice fiduciaries when they provide individualized voting recommendations to plans on a regular basis. Voting decisions must serve the exclusive purpose of maximizing risk-adjusted return on investment. The standard applies regardless of whether the advice incorporates policy preferences or ESG criteria unrelated to risk-adjusted return.
Executive Order, December 2025 (Trump Administration), “Protecting American Investors From Foreign-Owned and Politically Motivated Proxy Advisors”: Directed multiple federal agencies to review ISS and Glass Lewis, who together control over 90% of the proxy advisory market and whose voting guidelines have directly shaped governance practices at S&P 500 companies for two decades.
Harvard Law School Forum on Corporate Governance, Semler Brossy, June 13, 2026: ISS influence differential (vote-for vs. vote-against gap) for S&P 500 Say on Pay: 29.9 percentage points (2021) to 22.6 percentage points (2026). Russell 3000: 27.7 percentage points (2021) to 19.8 percentage points (2026). The multi-year sustained decline is not a single-season anomaly. Multiple institutional investor groups publicly announced independent voting frameworks during the 2026 proxy season.
The Strategic Implication
Defensive Risk. Compensation committee chairs and lead independent directors at S&P 500 companies without direct institutional investor engagement capabilities face structural exposure in the 2026 to 2027 proxy cycle. The two-decade model of managing the ISS relationship to secure institutional votes is no longer operative: pension fiduciaries now subject to ERISA’s exclusive-purpose standard must document independent voting rationale and cannot defer to proxy advisor recommendations without co-fiduciary risk exposure. Boards whose investor relations function remains proxy-advisor-proxied face genuinely unpredictable vote outcomes on executive compensation, board composition, and shareholder proposals. The responsible defense move is a direct institutional engagement strategy in place before Q4 2026 investor roadshow season. The Governance Boundary Principle applies: the DOL Technical Release did not create the board’s obligation to engage institutional holders directly. It revealed which boards had been outsourcing a governance standard they never owned.
Offensive Advantage. The governance gap created by proxy advisor fragmentation is an opening for boards that move first. The board that builds a direct engagement cadence with its top 20 institutional holders, develops governance narratives independent of ISS voting templates, and documents clear board rationale for compensation decisions earns durable positioning in the post-proxy-advisor era. As Glass Lewis transitions to AI-enabled customized voting perspectives effective 2027, the board that has already built direct institutional relationships owns the architecture to navigate the next wave of stewardship fragmentation. This is the Declarative Board Failure Pattern in reverse: the board that actively constructs its governance architecture before the model fractures completely earns the governance premium that separates board quality in a fragmented stewardship market.
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