$BSX

$45.58 -$0.11 (0.24%) Close

$BSX Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 1.45B shares outstanding

Who owns BSX?

By type of holder

Institutions 91.7% Insiders 0.2% Everyone else 8.2%

Concentration Top 10 holders own 36.6%

BlackRock, Inc. 9.0% · Vanguard Capital Management LLC 6.7%

Institutional ownership

91.7%

-0.9 pts vs last qtr

Institutional holders

1,482

-204 vs last qtr

Net shares bought

−13.5M

by institutions in Q2 2026

New / sold out

148 / 352

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Norges Bank NEW +21.2M
Jupiter Topco LLC NEW +18.8M

Biggest sellers in Q2 2026

FMR LLC −28.5M
Janus Henderson Group PLC SOLD OUT −16.5M

Who is planning to sell?

Notices of proposed sale, last 12 months

$22.1M

4 notices from 4 people

Shares covered

231.1K

0.02% of the company

Arranged in advance

100%

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Michael F Mahoney Officer 10b5-1 $15M
Joseph M Fitzgerald Officer 10b5-1 $4.97M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

+8.5%

+0.91% a year

Each share's claim on the business

−7.8%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$535M vs $1.92B

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years82% 3–5 years3% 1–3 years7% Under 1 year7%

Quarterly turnover

15.8%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting BSX on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
B BlackRock, Inc.	129.7M	8.95%	−2.1M (−1.6%)	≤2021	0.1%
Shares held by quarter Peak holding146.7M (Q2'25) Change over 8 quarters+980.2K Share of the company8.950% BlackRock, Inc.'s full portfolio →
VC Vanguard Capital Management LLC	97.1M	6.70%	+676.0K (+0.7%)	≤2021	0.1%
Shares held by quarter Peak holding97.1M (Q2'26) Change over 8 quarters+97.1M Share of the company6.700% Vanguard Capital Management LLC's full portfolio →

BlackRock, Inc.

129.7M

% of company

8.95%

Change vs last qtr

−2.1M (−1.6%)

Held since

≤2021

Vanguard Capital Management LLC

97.1M

% of company

6.70%

Change vs last qtr

+676.0K (+0.7%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Boston Scientific Corp, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting BSX on Form N-PORT; together they hold 35.6% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$2.01B	47.2M	3.26%	0.09%	June 30, 2026
V5 Vanguard 500 Index Fund Vanguard Index Funds	$1.64B	38.5M	2.66%	0.10%	June 30, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$2.01B

% of company

3.26%

% of the fund

0.09%

As of

June 30, 2026

Vanguard 500 Index Fund

Vanguard Index Funds

Position value

$1.64B

% of company

2.66%

% of the fund

0.10%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Boston Scientific Corp and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
MM Mahoney Michael F Insider	1.6M	0.11%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.110% Mahoney Michael F's insider activity →
FJ Fitzgerald Joseph Michael Insider	290.8K	0.02%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.020% Fitzgerald Joseph Michael's insider activity →

Mahoney Michael F

Insider

1.6M

% of company

0.11%

Change vs last qtr

—

Held since

—

Fitzgerald Joseph Michael

Insider

290.8K

% of company

0.02%

Change vs last qtr

—

Held since

—

21 more holders behind a free account

See every insider and 5%+ holder of Boston Scientific Corp.

Comments