Boston Scientific BSX Insider Ownership

NYSE BSX

$45.06 +0.67 (+1.50%)

At close: Oct 19, 2026 · 4:00 PM EDT

The most recent Boston Scientific (BSX) insider transaction: Padraig Andrew O'Connor (Evp, Global Operations) acquired 1,171 shares by exercising or converting derivatives on Sep 2, 2026, reported on Form 4 on Sep 3, 2026. So far in the quarter ending Dec 31, 2026, insider holdings showed no net buying or selling.

Updated Oct 11, 2026 Boston Scientific (BSX) stock price and overview

Insider Holdings by Owner

2.77Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

0.178%

▲+0.020% pp QoQ

Shares Held by Insiders

2.62Mn

filed for Sep 2026

▲+12.84% QoQ

Shares Outstanding

1.47Bn

1,470,200,000 shares

Direct Holdings

2.49Mn

Indirect: 126.35K

Net Shares Traded (QoQ)

+297.93K

net buying in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 11, 2026

Over the past year, BSX insiders bought $10.04 million of stock (206.36K shares) and sold $24.35 million (254K shares) on the open market.

Behind Boston Scientific's open-market trades in the past 12 months were 5 insiders buying and 4 insiders selling.
Among Boston Scientific's insiders, Michael F. Mahoney (Chairman, President & CEO) was the largest open-market buyer over the past 12 months, purchasing $9 million of stock (186.24K shares), most recently on August 3, 2026.
Meanwhile, the largest open-market sales of BSX in the past 12 months were by Michael F. Mahoney (Chairman, President & CEO), totaling $15.04 million (160.9K shares), most recently on February 2, 2026.
The newest open-market trade among Boston Scientific insiders came on August 25, 2026, when Susan E. Morano (Director) made a purchase of 2.04K shares for $100,408.
Away from the open market, BSX insiders received 423.44K shares in stock awards, acquired 272.36K shares through option exercises and conversions, gave up 247.59K shares to cover taxes or exercise prices and gave away 547.31K shares as gifts over the last 12 months.
Per Business Quant, BSX insiders together hold 2.62Mn shares based on their latest Form 4 filings, up 12.84% from 2.32Mn shares at the end of Q2 2026 and up 5.02% from 2.49Mn shares at the end of Q3 2025.
Of the 2.62Mn shares held by Boston Scientific insiders, 2.49Mn shares (95.17%) are held directly and 126.35K shares (4.83%) indirectly, through trusts, partnerships, family members and other entities.
Holdings in Boston Scientific stock are reported by 22 insiders, the officers, directors and 10% owners who have filed a Form 4 in the past two years.
Boston Scientific's three biggest insider holders are Michael F. Mahoney (Chairman, President & CEO, 1.61Mn shares), Joseph Michael Fitzgerald (EVP & Group President, Cardiology, 283.34K shares) and Daniel J. Brennan (EVP and CFO, 225.81K shares), based on their latest Form 4 filings.
The largest insider, Michael F. Mahoney, holds 61.59% of BSX's insider total.
Institutions owned 90.53% of BSX shares as of Q2 2026; insiders' latest Form 4 filings account for about 0.18%, leaving roughly 9.29% with other investors, including the public.
In the last 12 months, 56 Form 4 filings with transactions in BSX stock came from 17 insiders.
This summary of Boston Scientific insider activity covers Form 4 filings through September 3, 2026.

Form 4 Holdings

Insiders Holding BSX

Insiders 32

Shares held 2.77Mn

Of outstanding 0.189%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	Michael F Mahoney	Chairman, President Ceo	1,590,024	22,119	1,612,143	58.2%	05 Aug, 2026
2	Daniel J. Brennan	Evp And Cfo	225,808	0	225,808	8.1%	19 Feb, 2025
3	Maulik Nanavaty	Svp Pres, Neuromodulation	177,258	0	177,258	6.4%	02 Mar, 2022
4	David J Roux	Director	73,591	0	73,591	2.7%	05 May, 2023
5	Joseph Michael Fitzgerald	Evp Group Pres, Cardiology	0	64,198	64,198	2.3%	03 Aug, 2026
6	Arthur C Butcher	Evp Grp Pres, Medsurg Apac	56,887	0	56,887	2.1%	04 May, 2026
7	John E Sununu	Director	54,723	0	54,723	2.0%	09 May, 2025
8	Vance R Brown	Evp, Gc And Corp. Secretary	54,244	0	54,244	2.0%	18 Feb, 2026
9	Edward F Mackey	Evp, Operations	52,944	0	52,944	1.9%	02 Mar, 2022
10	David S Wichmann	Director	45,382	0	45,382	1.6%	11 May, 2026
11	Eric Francis Yves Thepaut	Evp Pres, Eur, Mid East, Afr	31,422	0	31,422	1.1%	13 May, 2024
12	Edward J Ludwig	Director	30,359	0	30,359	1.1%	03 Aug, 2026
13	Wendy Carruthers	Evp, Human Resources	29,308	0	29,308	1.1%	03 Dec, 2024
14	Ian T Meredith	Evp Global Chief Med Officer	28,082	0	28,082	1.0%	29 Mar, 2022
15	Ellen M Zane	Director	27,934	0	27,934	1.0%	11 May, 2026
16	Jeffrey B. Mirviss	Evppres, Periph Intervent	25,766	0	25,766	0.9%	25 Feb, 2025
17	Meghan Scanlon	Svp,Pres,Urology Pelvic Health	24,461	0	24,461	0.9%	02 May, 2022
18	Jodi Euerle Eddy	Svp, Chief Info Digital Off.	23,263	0	23,263	0.8%	04 Apr, 2022
19	John Bradley Sorenson	Evp, Global Operations	18,705	0	18,705	0.7%	05 May, 2025
20	Miriam O'Sullivan	Svp, Chief Hr Officer	17,302	0	17,302	0.6%	18 Feb, 2026
21	David C Habiger	Director	17,160	0	17,160	0.6%	07 Aug, 2026
22	Scott Olson	Svp Pres, Crm, Diagnostics	14,518	0	14,518	0.5%	01 Apr, 2022
23	Susan E Morano	Director	13,784	0	13,784	0.5%	26 Aug, 2026
24	Jessica L Mega	Director	12,035	0	12,035	0.4%	11 May, 2026
25	Jonathan Monson	Evp And Cfo	0	9,908	9,908	0.4%	11 Aug, 2026
26	Nelda J Connors	Director	8,823	0	8,823	0.3%	05 May, 2023
27	Padraig Andrew O'Connor	Evp, Global Operations	7,892	0	7,892	0.3%	03 Sep, 2026
28	Christophe Pierre Weber	Director	3,786	0	3,786	0.1%	11 May, 2026
29	Emily Woodworth	Svp, Global Controller And Cao	0	2,930	2,930	0.1%	12 Aug, 2026
30	Charles J Dockendorff	Director	2,901	0	2,901	0.1%	10 May, 2024
31	Yoshiaki Fujimori	Director	2,081	0	2,081	0.1%	30 Jul, 2025
32	Cheryl Pegus	Director	1,770	0	1,770	0.1%	21 May, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

8,711 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
02 Sep, 2026	Padraig Andrew O'Connor	Evp, Global Operations	Acquired M	1,171	$0.00	$0	8,459	Direct
02 Sep, 2026	Padraig Andrew O'Connor	Evp, Global Operations	Disposed F	567	$48.37	$27.43K	7,892	Direct
02 Sep, 2026	Padraig Andrew O'Connor	Evp, Global Operations	Disposed M	1,171	$0.00	$0	3,516	Direct
25 Aug, 2026	Susan E Morano	Director	Acquired P	2,040	$49.22	$100.41K	13,784	Direct
11 Aug, 2026	Emily Woodworth	Svp, Global Controller And Cao	Acquired I	2,930	$51.19	$149.99K	2,930	Indirect
10 Aug, 2026	Jonathan Monson	Evp And Cfo	Acquired I	9,908	$50.46	$499.96K	9,908	Indirect
05 Aug, 2026	David C Habiger	Director	Acquired P	2,100	$47.59	$99.94K	17,160	Direct
03 Aug, 2026	Michael F Mahoney	Chairman, President Ceo	Acquired P	186,240	$48.33	$9.00Mn	1,590,024	Direct
03 Aug, 2026	David C Habiger	Director	Acquired P	1,042	$48.07	$50.08K	14,920	Direct
03 Aug, 2026	Michael F Mahoney	Chairman, President Ceo	Acquired I	22,119	$48.43	$1.07Mn	22,119	Indirect
04 Aug, 2026	David C Habiger	Director	Acquired P	140	$48.59	$6.80K	15,060	Direct
31 Jul, 2026	Edward J Ludwig	Director	Acquired P	5,000	$45.48	$227.40K	30,359	Direct
31 Jul, 2026	Joseph Michael Fitzgerald	Evp Group Pres, Cardiology	Acquired I	64,198	$46.73	$3.00Mn	64,198	Indirect
01 Jul, 2026	Jonathan Monson	Evp And Cfo	Acquired M	2,087	$0.00	$0	40,073	Direct
01 Jul, 2026	Jonathan Monson	Evp And Cfo	Disposed F	1,010	$43.06	$43.49K	39,063	Direct
01 Jul, 2026	Jonathan Monson	Evp And Cfo	Disposed M	2,087	$0.00	$0	6,263	Direct
28 May, 2026	Michael F Mahoney	Chairman, President Ceo	Disposed G	386,755	$0.00	$0	0	Indirect
20 May, 2026	Edward J Ludwig	Director	Acquired P	3,580	$56.68	$202.91K	25,359	Direct
20 May, 2026	Cheryl Pegus	Director	Acquired P	1,770	$56.49	$99.99K	1,770	Direct
19 May, 2026	David C Habiger	Director	Acquired P	2,200	$56.95	$125.28K	11,628	Direct

Showing 1 to 20 of 8,711 transactions