SEI Investments Company (SEIC)
Who owns SEI Investments Company (SEIC)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 82.9% of the shares are freely tradable; institutional investors hold 77.5%.
Ownership Structure
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Group Inc | 9.21 | 11,071,365 | -1.7 | 12/31/2025 |
| BlackRock Inc | 8.41 | 10,110,337 | +4.9 | 03/31/2026 |
| Loomis, Sayles & Company LP | 7.17 | 8,628,879 | -1.3 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 5.09 | 6,125,643 | +0.0 | 03/31/2026 |
| Morgan Stanley - Brokerage Accounts | 3.98 | 4,792,279 | -5.6 | 03/31/2026 |
| Vanguard Capital Management, LLC | 3.94 | 4,741,716 | +0.0 | 03/31/2026 |
| State Street Corp | 3.48 | 4,185,178 | -2.3 | 03/31/2026 |
| Bank of America Corp | 2.43 | 2,920,506 | -0.1 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard Total Stock Mkt Idx Inv | 2.92 | 3,514,424 | +0.2 | 04/30/2026 |
| iShares Core S&P Mid-Cap ETF | 2.62 | 3,151,513 | +0.0 | 05/29/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 28. Jul 2026 | Warner Mark Andrew | See Remarks* | Sell | 7,400 | 102.97 | 761,993 |
| 28. Jul 2026 | Warner Mark Andrew | See Remarks* | Sell | 5,300 | 102.01 | 540,658 |
| 28. Jul 2026 | Warner Mark Andrew | See Remarks* | Sell | 2,300 | 101.11 | 232,542 |
| 28. Jul 2026 | Warner Mark Andrew | See Remarks* | Other | 5,000 | 56.54 | 282,700 |
| 28. Jul 2026 | Warner Mark Andrew | See Remarks* | Other | 2,500 | 64.43 | 161,075 |
| 28. Jul 2026 | Peterson Michael | Executive Vice President | Sell | 25,000 | 102.05 | 2,551,250 |
| 28. Jul 2026 | Peterson Michael | Executive Vice President | Other | 25,000 | 55.73 | 1,393,250 |
| 28. Jul 2026 | Guarino Carl | Director | Sell | 10,000 | 103.20 | 1,031,950 |
| 28. Jul 2026 | Guarino Carl | Director | Other | 5,000 | 49.63 | 248,150 |
| 24. Jul 2026 | Sharma Sanjay | See Remarks* | Sell | 20,000 | 99.33 | 1,986,588 |
| 24. Jul 2026 | Sharma Sanjay | See Remarks* | Other | 10,000 | 71.12 | 711,200 |
| 24. Jul 2026 | Shah Sneha S. | See Remarks* | Other | 3,746 | 96.73 | 362,351 |
| 23. Apr 2026 | Philip Mccabe | Insider | Sell | 15,000 | 91.82 | 1,377,300 |
| 23. Apr 2026 | Sanjay Sharma | Insider | Sell | 25,000 | 90.12 | 2,253,000 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.
View all insider transactions →Data as of: July 31, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.