Sei Investments Co
SEICFigures shown here come from public SEC filings. Dates beside each section show the available history.
How Sei Investments Co Makes Money
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From revenue to net income
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Financial Summary
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SEC filings supply these figures; updates after the dates shown are not included. This page includes 18 annual periods. The latest annual period ends Dec 31, 2025. The latest insider filing shown is dated Jun 29, 2026. The latest institutional report shown is dated Mar 31, 2026; other ownership filings may exist.
Ownership
Who holds the shares, as reported in SEC ownership filings.
Reported 13F positions
Each row shows what a filer reported for one date, not a current position. The link opens that filing.
| Filer | Report date | Shares | Value | Filing |
|---|---|---|---|---|
| DiNuzzo Private Wealth, Inc. | 2026-03-31 | 28 | $2.2K | SEC filing |
| NBC SECURITIES, INC. | 2026-03-31 | 9,149 | $718K | SEC filing |
| NORTHERN TRUST CORP | 2026-03-31 | 905,607 | $71.1M | SEC filing |
| AlTi Global, Inc. | 2026-03-31 | 2,648 | $208K | SEC filing |
| LORD, ABBETT & CO. LLC | 2026-03-31 | 2,204,379 | Not shown | SEC filing |
| Steward Partners Investment Advisory, LLC | 2026-03-31 | 4,057 | $318K | SEC filing |
| PUBLIC EMPLOYEES RETIREMENT ASSOCIATION OF COLORADO | 2026-03-31 | 219,635 | Not shown | SEC filing |
| Boston Partners | 2026-03-31 | 1,770,039 | $139M | SEC filing |
| AQR CAPITAL MANAGEMENT LLC | 2026-03-31 | 420,042 | $33M | SEC filing |
| Vise Technologies, Inc. | 2026-03-31 | 2,590 | $212K | SEC filing |
| Polymer Capital Management (US) LLC | 2026-03-31 | 5,049 | $396K | SEC filing |
| RBF Capital, LLC | 2026-03-31 | 10,000 | $785K | SEC filing |
| Moran Wealth Management, LLC | 2026-03-31 | 42,956 | $3.37M | SEC filing |
| Seneschal Advisors, LLC | 2026-03-31 | 4 | $314 | SEC filing |
| Access Investment Management LLC | 2026-03-31 | 138 | $10.8K | SEC filing |
| OAKWORTH CAPITAL, INC. | 2026-03-31 | 145 | $11.4K | SEC filing |
| BESSEMER GROUP INC | 2026-03-31 | 2,655 | Not shown | SEC filing |
| Maryland State Retirement & Pension System | 2026-03-31 | 5,131 | $403K | SEC filing |
| Anchor Investment Management, LLC | 2026-03-31 | 200 | $15.7K | SEC filing |
| Morningstar Investment Management LLC | 2026-03-31 | 46,245 | $3.63M | SEC filing |
- Each value is checked against Sei Investments Co's share prices from within about three months of its report date (insiders' Form 4 trades and the latest close).
- Value not shown for 3 rows: the filed value is about 1,000 times too small for the share count at Sei Investments Co's share price.
120 filers have only one report here.
Unusually large insider trades
Each trade is compared with the other insider trades of the same kind in the same security among Sei Investments Co's recent filings on file. Size alone is context, not a prediction or evidence of improper trading.
- 2025-05-29 · WEST ALFRED P JR: Larger than 75 of the 81 other insider sales of Common Stock on file. SEC filing
- 2025-05-28 · WEST ALFRED P JR: Larger than 78 of the 81 other insider sales of Common Stock on file. SEC filing
- 2025-05-15 · Peterson Michael: Larger than 73 of the 81 other insider sales of Common Stock on file. SEC filing
- 2024-12-13 · WEST ALFRED P JR: Larger than 79 of the 81 other insider sales of Common Stock on file. SEC filing
- 2024-11-08 · WEST ALFRED P JR: Larger than 80 of the 81 other insider sales of Common Stock on file. SEC filing
- 2024-08-28 · WEST ALFRED P JR: Larger than 74 of the 81 other insider sales of Common Stock on file. SEC filing
- 2024-05-10 · WEST ALFRED P JR: Larger than 76 of the 81 other insider sales of Common Stock on file. SEC filing
- 2024-05-09 · WEST ALFRED P JR: Larger than 76 of the 81 other insider sales of Common Stock on file. SEC filing
- 2024-03-26 · WEST ALFRED P JR: Larger than all 81 other insider sales of Common Stock on file. SEC filing
Purchases & sales (open market or private)
| Security | Code | Price | Filing | |||
|---|---|---|---|---|---|---|
| 2026-06-29 | WEST ALFRED P JR · Other | Common Stock | S — Open market or private sale | −5,652 | 87.18 | SEC filing |
| 2026-06-29 | WEST ALFRED P JR · Other | Common Stock | S — Open market or private sale | −1,680 | 88.09 | SEC filing |
| 2026-06-26 | WEST ALFRED P JR · Other | Common Stock | S — Open market or private sale | −46,162 | 87.21 | SEC filing |
| 2026-06-26 | WEST ALFRED P JR · Other | Common Stock | S — Open market or private sale | −3,838 | 87.67 | SEC filing |
| 2026-06-09 | DORAN WILLIAM · Director | Common Stock | S — Open market or private sale | −5,000 | 90.50 | SEC filing |
| 2026-05-04 | MCCARTHY KATHRYN · Director | Common Stock | S — Open market or private sale | −10,000 | 91.07 | SEC filing |
| 2026-04-28 | Warner Mark Andrew · In Remarks | Common Stock | S — Open market or private sale | −4,000 | 91.16 | SEC filing |
| 2026-04-23 | McCabe Philip · See Remarks | Common Stock | S — Open market or private sale | −15,000 | 91.82 | SEC filing |
Showing 8 of 10 rows
Grants, exercises, tax & gifts
| Security | Code | Filing | |||
|---|---|---|---|---|---|
| 2026-05-04 | MCCARTHY KATHRYN · Director | Common Stock | M — Exercise or conversion of derivative security | +5,000 | SEC filing |
| 2026-05-04 | MCCARTHY KATHRYN · Director | STOCK OPTION (RIGHT TO PURCHASE) | M — Exercise or conversion of derivative security | −5,000 | SEC filing |
| 2026-04-28 | Warner Mark Andrew · In Remarks | STOCK OPTION RIGHT TO PURCHASE | M — Exercise or conversion of derivative security | −2,000 | SEC filing |
| 2026-04-28 | Warner Mark Andrew · In Remarks | Common Stock | M — Exercise or conversion of derivative security | +4,000 | SEC filing |
| 2026-04-23 | Peterson Michael · EXECUTIVE VICE PRESIDENT | Option to Purchase Common Stock | M — Exercise or conversion of derivative security | −10,000 | SEC filing |
| 2026-04-23 | Sharma Sanjay · See Remarks* | Option to Purchase Common Stock | M — Exercise or conversion of derivative security | −12,500 | SEC filing |
| 2026-04-23 | Sharma Sanjay · See Remarks* | Common Stock | M — Exercise or conversion of derivative security | +12,500 | SEC filing |
| 2026-04-23 | Peterson Michael · EXECUTIVE VICE PRESIDENT | Common Stock | M — Exercise or conversion of derivative security | +10,000 | SEC filing |
Showing 8 of 36 rows
These tables describe filed transactions, not current holdings. Prices are shown as filed; a currency is added only when the filing's data names one. Amended and possible duplicate rows are left out of size comparisons and transaction groups.