Sei Investments SEIC Insider Ownership

Updated Oct 5, 2026

In the last 12 months, insiders at Sei Investments made open-market sales of $53.59 million (572.83K shares) and bought no shares on the open market.

• Behind Sei Investments' open-market sales in the past 12 months were 11 insiders, and no insider bought.
• Alfred P. West Jr. (Executive Chairman) led open-market sales of Sei Investments stock over the past 12 months with $15.51 million (178.43K shares), most recently on September 30, 2026.
• Outside the open market, Sei Investments insiders received 77.98K shares in stock awards, acquired 413K shares through option exercises and conversions, gave up 22.91K shares to cover taxes or exercise prices and gave away 15.5K shares as gifts over the past 12 months.
• Business Quant data puts insider holdings in SEIC at 9.5Mn shares across insiders' latest Form 4 filings, down 0.23% from 9.52Mn shares at the end of Q2 2026 and down 1.62% from 9.66Mn shares at the end of Q3 2025.
• By type of ownership, SEIC insiders hold all of their 9.5Mn shares directly.
• SEIC's insider total is spread across 17 insiders who have filed a Form 4 in the past two years.
• SEIC's three largest insider shareholders, per their latest Form 4 filings, are Alfred P. West Jr. (6.78Mn shares), Carmen Romeo (Director, 1.56Mn shares) and William Doran (Director, 618.8K shares).
• Alfred P. West Jr. alone accounts for 71.43% of the shares held by Sei Investments insiders.
• Institutional holders reported 75.77% of Sei Investments' outstanding shares for Q2 2026; insiders' latest Form 4 filings put their stake at about 7.89%, and other investors, including the public, hold the remaining 16.34%.
• Over the past 12 months, 16 insiders reported transactions in Sei Investments stock in 51 Form 4 filings.
• The insider holdings and trades above for Sei Investments reflect Form 4 filings through October 1, 2026.