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BSX in the 13F filings

Boston Scientific Corp · CUSIP 101137107

Sector · Medical devices and instrumentsTheme · Healthcare: biopharma and medtech· L3VLUP-definedTheme · Surgical, medical and electromedical devices
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023
Quarter end
31 Mar 2025
the date the book describes
Filed
5 Nov 2026
latest of these filings; the earliest 2 May 2025
Managers listing it
44
at least, of 95 tracked, among listed positions
Comparable managers
95
filed both Q4 2024 and Q1 2025; 40 listed it in both
Shares listed
328,980,437
combined, among listed positions
Reported value
$33.1bn
combined, at the quarter end

1 line marked †. Value as filed implies a price far from other filers'. Each counts in holders and value as filed, and is left out of the net change in shares.

Among the 95 comparable managers: 22 buyers (opened or added shares) and 21 sellers (trimmed or exited), at least, among listed positions. Their net change in shares is not known from listed positions, because at least one of them lists it in only one of the two quarters.

Managers listing BSX in Q1 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2024, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

44 of 44 holders

ActionFiling
Fidelity (FMR LLC)128,597,214$13.0bn0.83%Trimmed-3,845,6695 Nov 2026 (the filing on sec.gov)
Wellington Management Group LLP33,197,842$3.3bn0.64%Trimmed-2,967,55713 May 2025 (the filing on sec.gov)
Capital World Investors28,558,721$2.9bn0.47%Added+658,81812 May 2025 (the filing on sec.gov)
Invesco Ltd16,624,940$1.7bn0.32%Added+834,27412 May 2025 (the filing on sec.gov)
MFS Investment Management16,521,619$1.7bn0.55%Trimmed-3,138,3362 May 2025 (the filing on sec.gov)
Janus Henderson Group Ltd13,989,921$1.4bn0.76%Trimmed-987,89515 May 2025 (the filing on sec.gov)
T. Rowe Price Associates Inc10,610,487$1.1bn0.13%Added+1,664,10814 May 2025 (the filing on sec.gov)
Artisan Partners LP9,659,288$974m1.57%Trimmed-1,572,97414 May 2025 (the filing on sec.gov)
Marshall Wace LLP7,948,162$802m1.02%Trimmed-917,68115 May 2025 (the filing on sec.gov)
Millennium Management LLC† Value as filed implies a price far from other filers'.8,344,156$791m0.42%Trimmed-784,57215 May 2025 (the filing on sec.gov)
Arrowstreet Capital LP6,754,655$681m0.55%Added+1,162,69714 May 2025 (the filing on sec.gov)
Capital Research Global Investors5,943,966$600m0.13%Added+1,648,60712 May 2025 (the filing on sec.gov)
Citadel Advisors LLC5,433,555$548m0.10%Added+502,10315 May 2025 (the filing on sec.gov)
Two Sigma Advisers LP4,205,960$424m0.96%Added+3,450,70015 May 2025 (the filing on sec.gov)
Neuberger Berman Group LLC3,916,941$395m0.33%Trimmed-104,50427 Oct 2026 (the filing on sec.gov)
D. E. Shaw & Co.3,839,144$387m0.34%Added+3,075,64115 May 2025 (the filing on sec.gov)
Farallon Capital Management LLC3,762,757$380m1.82%Trimmed-1,260,20015 May 2025 (the filing on sec.gov)
AllianceBernstein LP3,036,935$306m0.11%Added+1,189,01615 May 2025 (the filing on sec.gov)
Two Sigma Investments LP2,440,747$246m0.53%Added+1,698,90015 May 2025 (the filing on sec.gov)
Viking Global Investors LP2,376,764$240m0.76%Added+204,55615 May 2025 (the filing on sec.gov)
Holocene Advisors LP1,885,752$190m0.55%Trimmed-1,171,94815 May 2025 (the filing on sec.gov)
Point72 Asset Management LP1,880,535$190m0.43%Trimmed-365,26421 Jul 2025 (the filing on sec.gov)
Balyasny Asset Management LLC1,838,179$185m0.31%Added+71,57115 May 2025 (the filing on sec.gov)
Steadfast Capital Management LP1,561,646$158m4.19%Trimmed-816,41815 May 2025 (the filing on sec.gov)
AQR Capital Management LLC1,155,829$114m0.12%Added+243,89315 May 2025 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2024 to Q1 2025, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (2)

Exited (0)

No exit shown by a manager’s own filing.

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
40 in Q3 2024 to 40 in Q2 2026

Tracked managers listing it, at least.

02040602014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
BSX by quarter
QuarterHoldersReported valueBuyersSellers
Q2 201313$3.9bnn.a.n.a.
Q3 201317$5.3bnn.a.n.a.
Q4 201315$4.8bnn.a.n.a.
Q1 201412$5.6bnn.a.n.a.
Q2 201415$5.1bnn.a.n.a.
Q3 201421$5.1bnn.a.n.a.
Q4 201416$5.3bnn.a.n.a.
Q1 201518$6.7bnn.a.n.a.
Q2 201519$6.9bnn.a.n.a.
Q3 201519$6.8bnn.a.n.a.
Q4 201520$7.4bnn.a.n.a.
Q1 201617$8.3bnn.a.n.a.
Q2 201624$10.6bnn.a.n.a.
Q3 201626$10.4bnn.a.n.a.
Q4 201625$9.2bnn.a.n.a.
Q1 201723$11.1bnn.a.n.a.
Q2 201726$12.7bnn.a.n.a.
Q3 201724$13.4bnn.a.n.a.
Q4 201730$11.5bnn.a.n.a.
Q1 201832$12.4bnn.a.n.a.
Q2 201825$15.3bnn.a.n.a.
Q3 201828$17.9bnn.a.n.a.
Q4 201828$16.2bnn.a.n.a.
Q1 201931$16.9bnn.a.n.a.
Q2 201923$19.2bnn.a.n.a.
Q3 201923$18.2bnn.a.n.a.
Q4 201926$19.7bnn.a.n.a.
Q1 202031$13.5bnn.a.n.a.
Q2 202029$14.1bnn.a.n.a.
Q3 202031$15.0bnn.a.n.a.
Q4 202035$13.6bnn.a.n.a.
Q1 202129$15.7bnn.a.n.a.
Q2 202127$18.2bnn.a.n.a.
Q3 202127$18.2bnn.a.n.a.
Q4 202126$17.4bnn.a.n.a.
Q1 202232$17.4bnn.a.n.a.
Q2 202230$14.0bnn.a.n.a.
Q3 202229$14.5bnn.a.n.a.
Q4 202226$16.6bnn.a.n.a.
Q1 202332$18.5bnn.a.n.a.
Q2 202337$19.6bnn.a.n.a.
Q3 202333$19.7bnn.a.n.a.
Q4 202330$20.6bn1419
Q1 202433$24.0bn1319
Q2 202435$26.8bn2115
Q3 202440$28.3bn2515
Q4 202440$29.4bn1821
Q1 202544$33.1bn2221
Q2 202544$33.6bn2421
Q3 202548$29.5bn2919
Q4 202549$28.5bn2822
Q1 202645$17.2bn2327
Q2 202640$13.0bn3021

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

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How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

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