Beta0% was sold under disclosed trading plans, 100% with no plan disclosed. The largest seller, Alfred West Jr. (Executive Chairman, Director), sold $15.5M.Share-of-stake figures for this company are being verified and will be added when that check is finished. Why
Price note. One filing reports a price of $1,775.00, about 100 times the median price of Sei Investments Co insider sales that month; it appears to be a decimal error for about $17.75, so we've excluded it from totals. Filing
A share of stake is shown for 0 of the 11 officers and directors who sold. 16 are left out Disclosed company stock is not an insider's whole wealth.i
Left out: Alfred West Jr., Carmen Romeo, William Doran, Ryan Hicke, Kathryn McCarthy, Sean Denham, Philip McCabe, Michael Lane, Sanjay Sharma, Sneha Shah, Carl Guarino, Michael Peterson, Jonathan Brassington, Karin Risi, Thomas Naratil and Mark Warner (share of stake is being verified).
Officers and directors, past 12 months. Their share of stake is being verified and is not shown yet; amounts and trading plans are below.
Officers and directors, Oct 2025 to Oct 2026. Each sale is counted once: under a disclosed plan, else to cover taxes, else no plan disclosed.
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Alfred West Jr. Executive Chairman, Director | 5,483 | $103.16 | n/a | n/a | Sep 30, 2026 | Oct 1, 2026 |
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Alfred West Jr. Executive Chairman, Director | 28,394 | $103.40 | n/a | n/a | Sep 29, 2026 | Oct 1, 2026 |
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Michael Lane Executive Vice President | 2,400 | $102.78 | n/a | n/a | Sep 22, 2026 | Sep 24, 2026 |
"% of total stake" is the shares in an event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings are not confirmed, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.
William Doran reported no open-market sales in the past 12 months. Large shareholders and the funds or companies that board members represent are not part of management, so they are left out of the figures above.
Yes. Ryan Hicke sold 118K shares ($11.1M) in the past 12 months, none of it under a trading plan disclosed in the filings.
Filings rarely give a reason, and we don't guess at one. What they show is how the sales were made: 0% of sales by value ran under 10b5-1 trading plans disclosed in the filings and 100% had no disclosed plan. A trading plan schedules sales in advance.
No. Officers and directors reported no purchases in the past 12 months.
| Who sold | Amount | % of holdings | Trading plan |
|---|---|---|---|
| Alfred West Jr. Executive Chairman, Director | $15.5M 178K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Ryan Hicke Chief Executive Officer | $11.1M 118K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Michael Peterson Executive Vice President | $9.7M 98K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Philip McCabe Executive Vice President, Head of SEI's Investment Managers business | $5.5M 57K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Sanjay Sharma Executive Vice President, CEO of SEI International, and Global Head of SEI's Private Banking business | $4.2M 45K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Mark Warner Chief Accounting Officer and Controller | $2.2M 23K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Kathryn McCarthy Director | $1.9M 20K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| William Doran Director | $1.0M 12K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Carl Guarino Director | $1.0M 10K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Carmen Romeo Director | $969K 10K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Michael Lane Executive Vice President | $247K 2.4K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
Sold by a charitable foundation the insider reports: DORAN FAMILY FOUNDATION, reported by William Doran. A foundation's shares are not the insider's own stake, so they are left out of the figures above.
Vested shares across all share classes, held directly and through trusts, LLCs and family members, as reported on SEC Forms 3, 4 and 5. Unvested awards and options are never counted as owned shares.
| Insider | Held Oct 16, 2025 | Sold | Held Oct 16, 2026 | Still held |
|---|---|---|---|---|
Alfred West Jr.!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Alfred West Jr. are complete. Executive Chairman, Director | n/a | −178K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Alfred West Jr.Holdings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Alfred West Jr. are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −4.6Kwithheld by the company for taxes | ||||
Carmen Romeo!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Carmen Romeo are complete. Director | n/a | −10K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Carmen RomeoHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Carmen Romeo are complete; balances and unit counts will be added when the check is finished. −16Kgifted (net of own trusts) | ||||
William Doran!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for William Doran are complete. Director | n/a | −12K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for William DoranHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for William Doran are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Ryan Hicke!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Ryan Hicke are complete. Chief Executive Officer | n/a | −118K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Ryan HickeHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Ryan Hicke are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −4.3Kwithheld by the company for taxes | ||||
Kathryn McCarthy!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Kathryn McCarthy are complete. Director | n/a | −20K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Kathryn McCarthyHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Kathryn McCarthy are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −24withheld by the company for taxes | ||||
Sean Denham!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Sean Denham are complete. Executive VP, CFO, COO | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Sean DenhamHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Sean Denham are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −7.7Kwithheld by the company for taxes | ||||
Philip McCabe!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. See the filing Sales and other transactions for Philip McCabe are complete. Executive Vice President, Head of SEI's Investment Managers business | n/a | −57K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Philip McCabeHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Philip McCabe are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −1.1Kwithheld by the company for taxes | ||||
Michael Lane!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Michael Lane are complete. Executive Vice President | n/a | −2.4K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Michael LaneHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Michael Lane are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Sanjay Sharma!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Sanjay Sharma are complete. Executive Vice President, CEO of SEI International, and Global Head of SEI's Private Banking business | n/a | −45K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Sanjay SharmaHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Sanjay Sharma are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Sneha Shah!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Sneha Shah are complete. EVP &Chief AI Strategist & Head of SEI Next | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Sneha ShahHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Sneha Shah are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −3.7Kwithheld by the company for taxes | ||||
Carl Guarino!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Carl Guarino are complete. Director | n/a | −10K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Carl GuarinoHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Carl Guarino are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Michael Peterson!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. See the filing Sales and other transactions for Michael Peterson are complete. Executive Vice President | n/a | −98K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Michael PetersonHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Michael Peterson are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −1.1Kwithheld by the company for taxes | ||||
Jonathan Brassington!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Jonathan Brassington are complete. Director | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Jonathan BrassingtonHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Jonathan Brassington are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Karin Risi!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Karin Risi are complete. Director | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Karin RisiHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Karin Risi are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Thomas Naratil!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Thomas Naratil are complete. Director | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Thomas NaratilHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Thomas Naratil are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Mark Warner!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Mark Warner are complete. Chief Accounting Officer and Controller | n/a | −23K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Mark WarnerHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Mark Warner are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −379withheld by the company for taxes | ||||
Holdings and share of stake for Sei Investments Co are being verified, so no balances, unit counts or percentages are shown. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings.
Officer and director open-market sales: $53.6M across 572,826 shares. Plan status and stated purpose are separate questions, and a sale can have both.
Sales with no 10b5-1 plan and no tax reference in the filing. $15.5M of it is Alfred West Jr.. No plan disclosed is a statement about the filing, not about why the sale happened. Largest such sale: Ryan Hicke, Jan 29, 2026
22,910 shares ($1.9M) were withheld by the company for taxes, which isn't a market sale.
| Seller | Shares sold | Proceeds | Under a disclosed plan | Share of total | Sales dates |
|---|---|---|---|---|---|
| Alfred West Jr. Executive Chairman, Director | 178K | $15.5M | 0% | 29% | Dec 3, 2025 to Sep 30, 2026 |
| Ryan Hicke Chief Executive Officer | 118K | $11.1M | 0% | 21% | Jan 29, 2026 to Sep 3, 2026 |
| Michael Peterson Executive Vice President | 98K | $9.7M | 0% | 18% | Nov 12, 2025 to Aug 28, 2026 |
| Philip McCabe Executive Vice President, Head of SEI's Investment Managers business | 57K | $5.5M | 0% | 10% | Dec 4, 2025 to Aug 5, 2026 |
| Sanjay Sharma Executive Vice President, CEO of SEI International, and Global Head of SEI's Private Banking business | 45K | $4.2M | 0% | 8% | Apr 23, 2026 to Jul 24, 2026 |
| Mark Warner Chief Accounting Officer and Controller | 23K | $2.2M | 0% | 4% | Feb 25, 2026 to Jul 28, 2026 |
| Kathryn McCarthy Director | 20K | $1.9M | 0% | 4% | May 4, 2026 to Aug 3, 2026 |
| William Doran Director | 12K | $1.0M | 0% | 2% | Dec 22, 2025 to Jun 9, 2026 |
| Carl Guarino Director | 10K | $1.0M | 0% | 2% | Jul 28, 2026 to Jul 28, 2026 |
| Carmen Romeo Director | 10K | $969K | 0% | 2% | Nov 11, 2025 to Sep 1, 2026 |
| Michael Lane Executive Vice President | 2.4K | $247K | 0% | 0.5% | Sep 22, 2026 to Sep 22, 2026 |
| Month | Sale proceeds | Disclosed plan | To cover taxes | No plan disclosed |
|---|---|---|---|---|
| Oct 2025 | $0 | $0 | $0 | $0 |
| Nov 2025 | $2.5M | $0 | $0 | $2.5M |
| Dec 2025 | $3.6M | $0 | $0 | $3.6M |
| Jan 2026 | $7.0M | $0 | $0 | $7.0M |
| Feb 2026 | $327K | $0 | $0 | $327K |
| Mar 2026 | $5.0M | $0 | $0 | $5.0M |
| Apr 2026 | $4.9M | $0 | $0 | $4.9M |
| May 2026 | $911K | $0 | $0 | $911K |
| Jun 2026 | $5.5M | $0 | $0 | $5.5M |
| Jul 2026 | $7.1M | $0 | $0 | $7.1M |
| Aug 2026 | $8.4M | $0 | $0 | $8.4M |
| Sep 2026 | $8.4M | $0 | $0 | $8.4M |
| Oct 2026 | $0 | $0 | $0 | $0 |
In line with the past 5 years. 11 insiders sold; the average is 8 a year.
| 12 months ending | Shares sold | Insiders who sold | Proceeds |
|---|---|---|---|
| Oct 16, 2026 Latest 12 months | 573K | 11 | $53.6M |
| Oct 16, 2025 1 year earlier | 845K | 10 | $69.6M |
| Oct 16, 2024 2 years earlier | 851K | 7 | $55.8M |
| Oct 17, 2023 3 years earlier | 880K | 10 | $53.0M |
| Oct 17, 2022 4 years earlier | 617K | 4 | $35.3M |
| Oct 17, 2021 5 years earlier | 440K | 9 | $25.0M |
Open-market sales (Form 4 code S) by people who were officers or directors, in split-adjusted shares. Earlier years include people who have since left. A sale that an outside holder also reports (a family trust, a fund) is counted with outside holders in every year. Shares, not dollars, are compared, so a change in the stock price doesn't look like a change in selling. Years the filings don't fully cover are shown but left out of the average.
Holdings and share of stake are being verified. Balances, unit counts and every share-of-stake figure for Sei Investments Co are held back until that check is finished. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings and are complete.
External context: we only cite outside events when a documented connection exists. None is shown for this period.
All 1,318 Forms 3, 4 and 5 on record for Sei Investments Co (SEC CIK 350894), filed from Jun 2, 2003 to Oct 1, 2026; 53 of them were filed in the 12 months this page covers, retrieved from SEC EDGAR on Oct 16, 2026. Prices are the ones reported in each filing, often weighted averages. 2 filings were left out because Sei Investments Co filed them as an owner of another company's stock.
Probable 2-for-1 stock split on or before Jun 21, 2007 (split date stated in a footnote). Splits aren't reported as transactions; 23 holding lines changed by exactly this ratio, so earlier share counts are restated.
Holdings. Each holding line (a share class plus an owner, such as a trust or LLC) carries its last reported balance forward. Entities first reported during the period start at zero, so transfers between an insider's own trusts don't count as selling. Lines not reported for three years or more are listed separately and left out of totals.
Sales. A sale counts as under a 10b5-1 plan if its footnote cites one or the filing's Rule 10b5-1 box is checked, and as tax-related if its footnote cites tax obligations or sell-to-cover. Shares withheld by the company for taxes are listed separately. Sales with neither attribute are labeled "no plan disclosed".
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