SEI Investments Company (SEIC) insider trading
Recent insider transactions reported to the SEC on Form 4 — directors and officers buying or selling their own company’s stock. Sourced directly from public SEC filings, latest filed Oct 1, 2026.
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- Filings shown
- 12
- Open-market buys
- 0
- Open-market sells
- 15
Counts cover the 12 most recent Form 4 filings Tradune holds for SEIC (filed Jul 28 – Oct 1, 2026). No completed check of SEIC's Form 4 list on SEC EDGAR is on record yet; the latest SEIC filing Tradune holds was filed Oct 1, 2026. This is not guaranteed to be the complete record — see SEIC's full Form 4 filing history on SEC EDGAR.
Open-market activity, last 90 days
Purchases (Form 4 code P) and sales (code S) on the 12 filings Tradune holds for SEIC filed Jul 28 – Oct 1, 2026. Grants, exercises, tax withholding and the other Form 4 transaction codes are left out.
15 open-market sales by Rule 10b5-1 checkbox
- On filings with the 10b5-1 box checked
- 0 sales· 0 sh
- checkbox disclosed
- On filings with the box not checked
- 15 sales· 226,277 sh
- not proof that no plan exists
- Not comparable
- 0 sales· 0 sh
- filed before Apr 1, 2023, or no checkbox value in the filing data
Counts are Form 4 lines as filed. The checkbox is one per filing, so every sale on a filing with the box checked is counted there even if only some of its transactions were under a plan; it records what the filer disclosed, and the three categories are not a judgement about why a sale was made.
| Insider | Buys | Sells | Shares bought | Shares sold | Value |
|---|---|---|---|---|---|
| Mark Andrew WarnerSee Remarks* | 0 | 3 | — | 15,000 | −$1,535,193 |
| Michael PetersonExecutive Vice President | 0 | 2 | — | 62,500 | −$6,732,875 |
| Alfred P. West Jr.Insider | 0 | 2 | — | 33,877 | −$3,501,662 |
| Philip McCabeOfficer (see filing) | 0 | 2 | — | 30,000 | −$3,153,470 |
| Ryan HickeChief Executive Officer | 0 | 1 | — | 37,500 | −$4,151,663 |
| Sanjay SharmaSee Remarks* | 0 | 1 | — | 20,000 | −$1,986,588 |
| Carl GuarinoDirector | 0 | 1 | — | 10,000 | −$1,031,950 |
| Kathryn McCarthyDirector | 0 | 1 | — | 10,000 | −$1,035,350 |
| Carmen RomeoDirector | 0 | 1 | — | 5,000 | −$548,500 |
| Michael LaneExecutive Vice President | 0 | 1 | — | 2,400 | −$246,672 |
Value = shares × the price reported on each Form 4 (+ purchases, − sales); every open-market line in this window disclosed a price.
Summarises ~90 days of public SEC Form 4 activity — more distinct buyers, officer involvement and net buying score higher. A description of filing activity, not a rating or buy signal. How this score is computed →
How to read this: an open-market purchase (Form 4 code P) is a buy at the market price with the insider’s own money, as opposed to a grant, award or option exercise; an open-market sale is code S. When two or more distinct insiders report open-market purchases in the same 90-day window, this site labels that a cluster — a definition, not a forecast; see insider cluster buying. “Held after” is Form 4 Table I column 5; “Change” = shares ÷ holdings before the trade (held after − shares for an acquisition, held after + shares for a disposition).
Insider Buying at SEIC
No open-market insider purchases (Form 4 code P) were reported for SEIC in the trailing 90 days. The filings below may include other transaction types — sales, grants, option exercises, and tax withholding — shown for completeness; they are not open-market purchases.
Recent Form 4 filings
Source: SEC EDGAR Form 4 · transaction codes explained
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box not checked | 5,483 | $103.16 | 6,784,574 | −0.1% | Sep 30, 2026 |
| Open-market sale 10b5-1 box not checked | 28,394 | $103.40 | 6,790,057 | −0.4% | Sep 29, 2026 |
† change in this filer’s own reported holding line (Form 4 Table I, col. 5), not of total company ownership; small prior holdings produce large percentages, so under 100 shares the prior holding is shown instead.
“10b5-1 box checked” = the filer checked the Form 4 box stating that a transaction on the filing was made under a plan intended to satisfy Rule 10b5-1(c); “10b5-1 box not checked” = the box was left blank, which does not prove that no plan exists. The box applies to Form 4s filed from April 1, 2023; older filings, and boxes we could not read, carry no tag. What the 10b5-1 box means.
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box not checked | 2,400 | $102.78 | 39,581 | −5.7% | Sep 22, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Option exercise | 20,000 | $64.43 | 230,315 | +9.5% | Sep 3, 2026 |
| Option exercise Option to Purchase Common Stock | 17,500 | — | — | — | Sep 3, 2026 |
| Option exercise Option to Purchase Common Stock | 20,000 | — | — | — | Sep 3, 2026 |
| Option exercise | 17,500 | $48.47 | 210,315 | +9.1% | Sep 3, 2026 |
| Open-market sale 10b5-1 box not checked | 37,500 | $110.71 | 192,815 | −16% | Sep 3, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Option exercise Option to Purchase Common Stock | 5,000 | — | — | — | Sep 1, 2026 |
| Option exercise | 5,000 | $49.63 | 1,565,293 | +0.3% | Sep 1, 2026 |
| Open-market sale 10b5-1 box not checked | 5,000 | $109.70 | 1,560,293 | −0.3% | Sep 1, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Option exercise Option to Purchase Common Stock | 37,500 | — | — | — | Aug 28, 2026 |
| Option exercise | 37,500 | $56.54 | 57,648 | +186% | Aug 28, 2026 |
| Open-market sale 10b5-1 box not checked | 37,500 | $111.51 | 20,148 | −65% | Aug 28, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box not checked | 5,043 | $105.50 | 54,884 | −8.4% | Aug 5, 2026 |
| Option exercise Option to Purchase Common Stock | 5,043 | — | — | — | Aug 5, 2026 |
| Option exercise | 5,043 | $49.63 | 59,927 | +9.2% | Aug 5, 2026 |
| Option exercise | 9,957 | $49.63 | 64,841 | +18% | Aug 4, 2026 |
| Option exercise | 15,000 | $49.63 | 79,841 | +23% | Aug 4, 2026 |
| Option exercise Option to Purchase Common Stock | 9,957 | — | — | — | Aug 4, 2026 |
| Option exercise Option to Purchase Common Stock | 15,000 | — | — | — | Aug 4, 2026 |
| Open-market sale 10b5-1 box not checked | 24,957 | $105.04 | 54,884 | −31% | Aug 4, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market sale 10b5-1 box not checked | 10,000 | $103.54 | 77,883 | −11% | Aug 3, 2026 |
| Option exercise Option to Purchase Common Stock | 5,000 | — | — | — | Aug 3, 2026 |
| Option exercise Option to Purchase Common Stock | 5,000 | — | — | — | Aug 3, 2026 |
| Option exercise | 5,000 | $71.12 | 82,883 | +6.4% | Aug 3, 2026 |
| Option exercise | 5,000 | $71.12 | 87,883 | +6.0% | Aug 3, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Option exercise | 2,500 | $64.43 | 3,421 | +271% | Jul 28, 2026 |
| Option exercise | 2,500 | $64.43 | 5,921 | +73% | Jul 28, 2026 |
| Option exercise | 5,000 | $56.54 | 10,921 | +84% | Jul 28, 2026 |
| Option exercise | 5,000 | $56.54 | 15,921 | +46% | Jul 28, 2026 |
| Open-market sale 10b5-1 box not checked | 2,300 | $101.11 | 13,621 | −14% | Jul 28, 2026 |
| Open-market sale 10b5-1 box not checked | 5,300 | $102.01 | 8,321 | −39% | Jul 28, 2026 |
| Open-market sale 10b5-1 box not checked | 7,400 | $102.97 | 921 | −89% | Jul 28, 2026 |
| Option exercise Option to Purchase Common Stock | 2,500 | — | — | — | Jul 28, 2026 |
| Option exercise Option to Purchase Common Stock | 2,500 | — | — | — | Jul 28, 2026 |
| Option exercise Option to Purchase Common Stock | 5,000 | — | — | — | Jul 28, 2026 |
| Option exercise Option to Purchase Common Stock | 5,000 | — | — | — | Jul 28, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Option exercise | 25,000 | $55.73 | 45,148 | +124% | Jul 28, 2026 |
| Open-market sale 10b5-1 box not checked | 25,000 | $102.05 | 20,148 | −55% | Jul 28, 2026 |
| Option exercise Option to Purchase Common Stock | 25,000 | — | — | — | Jul 28, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Option exercise Option to Purchase Common Stock | 5,000 | — | — | — | Jul 28, 2026 |
| Option exercise | 5,000 | $49.63 | 23,308 | +27% | Jul 28, 2026 |
| Option exercise | 5,000 | $49.63 | 28,308 | +21% | Jul 28, 2026 |
| Open-market sale 10b5-1 box not checked | 10,000 | $103.20 | 18,308 | −35% | Jul 28, 2026 |
| Option exercise Option to Purchase Common Stock | 5,000 | — | — | — | Jul 28, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Option exercise | 10,000 | $71.12 | 49,829 | +25% | Jul 24, 2026 |
| Option exercise | 10,000 | $71.12 | 59,829 | +20% | Jul 24, 2026 |
| Open-market sale 10b5-1 box not checked | 20,000 | $99.33 | 39,829 | −33% | Jul 24, 2026 |
| Option exercise Option to Purchase Common Stock | 10,000 | — | — | — | Jul 24, 2026 |
| Option exercise Option to Purchase Common Stock | 10,000 | — | — | — | Jul 24, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Tax withholding | 3,746 | $96.73 | 14,092 | −21% | Jul 24, 2026 |
Insider filings reported around the same time
Other companies whose most recent Form 4 was filed closest to SEIC's (Oct 1, 2026).
Frequently asked about SEIC insider activity
How many insiders bought SEIC stock in the last 90 days?
No open-market purchases (Form 4 code P) of SEIC shares were reported by SEI Investments Company insiders in the trailing 90 days. The 12 filings shown on this page cover other transaction types — sales, grants, option exercises, and tax withholding.
Who filed the most recent Form 4 for SEIC?
The most recent Form 4 on this page was filed by Alfred P. West Jr. (Insider) on Oct 1, 2026, reporting 2 transactions. The original document is linked from the filing list above on SEC EDGAR. Amended filings (Form 4/A) may later revise reported figures.
What was the largest open-market SEIC insider sale shown?
The largest open-market sale among the filings shown was 37,500 SEIC shares at $111.51 (about $4,181,625) by Michael Peterson (Executive Vice President) on Aug 28, 2026. Value is shares × the price reported on the Form 4; its Rule 10b5-1 box is not checked.
New to Form 4s? The transaction codes, the 90-day window and the 0–100 score are defined on the insider-activity score methodology page.
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Track SEIC insider filings free →This score summarizes SEC Form 4 filing activity over the trailing 90 days. It is descriptive, not predictive — not a rating, recommendation, or investment advice. Data: SEC EDGAR (public domain), as filed; amendments may revise figures. Tradune is not a registered investment adviser.
Data as filed; amended filings (Form 4/A) may revise figures. Sales may occur under prearranged Rule 10b5-1 trading plans.