Sei Investments Co (SEIC) Institutional Ownership

Ownership Summary

Sei Investments Co (NASDAQ:SEIC) is held by 546 institutional investors per 13F filings through December 2025.

• These investors collectively held 70.0% of Sei Investments's outstanding shares in December 2025, down from 73.1% in September 2025.
• Their total shares held in SEIC decreased -2.02% quarter over quarter, and separately, investors owning Sei Investments increased 2.44% from a year ago.
• During the quarter, 271 of these 546 funds increased positions in SEIC, 191 reduced exposure, and 84 held steady.
• In total, institutional investors held 88.38Mn shares in Sei Investments as of December 2025, down by 1.83Mn shares quarter on quarter, and down 10.04Mn shares year over year.
• As of December 31, 2025, BlackRock, Inc. held the largest stake in Sei Investments with 10.11Mn shares, accounting for 8.0% of total shares outstanding.
• The biggest buyers of Sei Investments for the quarter ending December 2025 included VANGUARD PORTFOLIO MANAGEMENT LLC (6.13Mn), VANGUARD CAPITAL MANAGEMENT LLC (4.74Mn), Boston Partners (1.77Mn), FMR LLC (749.32K), VANGUARD FIDUCIARY TRUST CO (590.06K).
• The largest sellers of Sei Investments for the quarter ending December 2025 were Invesco Ltd. (586.98K), Qube Research & Technologies Ltd (438.22K), UBS Group AG (319.59K), Goldman Sachs Group Inc (314.29K), Morgan Stanley (282.9K).
• Business Quant data shows the 10 biggest positions in Sei Investments as of December 2025 are held by BlackRock, Inc. (10.11Mn), LOOMIS SAYLES & CO L P (8.63Mn), VANGUARD PORTFOLIO MANAGEMENT LLC (6.13Mn), Morgan Stanley (4.79Mn), VANGUARD CAPITAL MANAGEMENT LLC (4.74Mn), State Street Corp (4.19Mn), Bank Of America Corp /De/ (2.92Mn), GEODE CAPITAL MANAGEMENT, LLC (2.83Mn), LORD, ABBETT & CO. LLC (2.2Mn), FMR LLC (2.09Mn).