Boston Scientific Corp (BSX) 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 Sep 3, 2026.
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- Filings shown
- 9
- Open-market buys
- 6
- Open-market sells
- 0
- Buys, 10b5-1 box not checked
- 6 of 6
Counts cover the 9 most recent Form 4 filings Tradune holds for BSX (filed Aug 3 – Sep 3, 2026). No completed check of BSX's Form 4 list on SEC EDGAR is on record yet; the latest BSX filing Tradune holds was filed Sep 3, 2026. This is not guaranteed to be the complete record — see BSX'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 9 filings Tradune holds for BSX filed Aug 3 – Sep 3, 2026. Grants, exercises, tax withholding and the other Form 4 transaction codes are left out.
| Insider | Buys | Sells | Shares bought | Shares sold | Value |
|---|---|---|---|---|---|
| David C. HabigerDirector | 3 | 0 | 3,282 | — | +$156,823 |
| Michael F. MahoneyChairman, President & CEO | 1 | 0 | 186,240 | — | +$9,001,408 |
| Edward J. LudwigDirector | 1 | 0 | 5,000 | — | +$227,400 |
| Susan E. MoranoDirector | 1 | 0 | 2,040 | — | +$100,408 |
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 →
Weekly signal history
BSX appeared in 5 archived weekly editions as a multi-insider cluster, a top net buyer, or both. These are frozen weekly snapshots, not a complete filing history.
- Week of Oct 7, 2026 4 insiders buying · $9,486,038 net
- Week of Sep 30, 2026 4 insiders buying · $9,486,038 net
- Week of Sep 23, 2026 4 insiders buying · $9,486,038 net 6 open-market buys · $9,486,038 net
- Week of Sep 16, 2026 4 insiders buying · $9,486,038 net 6 open-market buys · $9,486,038 net
- Week of Sep 9, 2026 4 insiders buying · $9,486,038 net 6 open-market buys · $9,486,038 net
An entry means this company met that edition’s displayed cluster or top-buyer threshold. Missing weeks do not mean no insider transaction occurred. All figures are derived from SEC Form 4 filings; open-market buys minus sales are shown as net only when every transaction value was disclosed.
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 BSX
Insiders reported 6 open-market purchases of BSX in the trailing 90 days, across 4 distinct buyers. The most recent purchase was reported by Susan E. Morano (Director) on Aug 25, 2026. Grants, option exercises, and tax-withholding transactions are excluded from these counts.
Recent Form 4 filings
Source: SEC EDGAR Form 4 · transaction codes explained
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Option exercise | 1,171 | — | 8,459 | +16% | Sep 2, 2026 |
| Tax withholding | 567 | $48.37 | 7,892 | −6.7% | Sep 2, 2026 |
| Option exercise Restricted Stock Units | 1,171 | — | — | — | Sep 2, 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.
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market purchase 10b5-1 box not checked | 2,040 | $49.22 | 13,784 | +17% | Aug 25, 2026 |
“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 |
|---|---|---|---|---|---|
| Discretionary transaction | 2,930 | $51.19 | 2,930 (indirect) | — | Aug 11, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Discretionary transaction | 9,908 | $50.46 | 9,908 (indirect) | — | Aug 10, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market purchase 10b5-1 box not checked | 2,100 | $47.59 | 17,160 | +14% | Aug 5, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market purchase 10b5-1 box not checked | 140 | $48.59 | 15,060 | +0.9% | Aug 4, 2026 |
| Open-market purchase 10b5-1 box not checked | 1,042 | $48.07 | 14,920 | +7.5% | Aug 3, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market purchase 10b5-1 box not checked | 186,240 | $48.33 | 1,590,024 | +13% | Aug 3, 2026 |
| Discretionary transaction | 22,119 | $48.43 | 22,119 (indirect) | — | Aug 3, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Open-market purchase 10b5-1 box not checked | 5,000 | $45.48 | 30,359 | +20% | Jul 31, 2026 |
| Transaction | Shares | Price | Held after | Change† | Date |
|---|---|---|---|---|---|
| Discretionary transaction | 64,198 | $46.73 | 64,198 (indirect) | — | Jul 31, 2026 |
Insider filings reported around the same time
Other companies whose most recent Form 4 was filed closest to BSX's (Sep 3, 2026).
Frequently asked about BSX insider activity
How many insiders bought BSX stock in the last 90 days?
4 distinct insiders at Boston Scientific Corp reported 6 open-market purchases (Form 4 code P) of BSX shares in the trailing 90 days, the most recent filed by Susan E. Morano (Director) on Aug 25, 2026. Grants, option exercises, and tax-withholding transactions are excluded from these counts.
Who filed the most recent Form 4 for BSX?
The most recent Form 4 on this page was filed by Padraig Andrew O'Connor (EVP, Global Operations) on Sep 3, 2026, reporting 3 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 BSX insider purchase shown?
The largest open-market purchase among the filings shown was 186,240 BSX shares at $48.33 (about $9,001,408) by Michael F. Mahoney (Chairman, President & CEO) on Aug 3, 2026. Value is shares × the price reported on the Form 4; its Rule 10b5-1 box is not checked.
Do the recent BSX insider purchases have the Form 4 10b5-1 box checked?
No. All 6 BSX open-market purchases shown were reported with the Rule 10b5-1 box not checked. A blank box records what the filer disclosed; it does not prove that no plan exists. Latest: Susan E. Morano (Director) on Aug 25, 2026, 2,040 shares.
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 BSX 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.