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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
30 Jun 2025
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 7 Aug 2025
Managers listing it
44
at least, of 95 tracked, among listed positions
Comparable managers
95
filed both Q1 2025 and Q2 2025; 41 listed it in both
Shares listed
313,284,513
combined, among listed positions
Reported value
$33.6bn
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: 24 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 Q2 2025

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q1 2025, 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)108,310,577$11.6bn0.66%Trimmed-20,286,63714 Aug 2025 (the filing on sec.gov)
Wellington Management Group LLP32,649,465$3.5bn0.64%Trimmed-548,37714 Aug 2025 (the filing on sec.gov)
Capital World Investors28,524,768$3.1bn0.45%Trimmed-33,95313 Aug 2025 (the filing on sec.gov)
Invesco Ltd16,851,518$1.8bn0.31%Added+226,57813 Aug 2025 (the filing on sec.gov)
MFS Investment Management12,859,158$1.4bn0.44%Trimmed-3,662,4618 Aug 2025 (the filing on sec.gov)
Janus Henderson Group Ltd12,157,715$1.3bn0.64%Trimmed-1,832,20614 Aug 2025 (the filing on sec.gov)
T. Rowe Price Associates Inc11,021,280$1.2bn0.13%Added+410,79314 Aug 2025 (the filing on sec.gov)
Artisan Partners LP8,518,201$915m1.34%Trimmed-1,141,08712 Aug 2025 (the filing on sec.gov)
Marshall Wace LLP7,497,657$805m0.91%Trimmed-450,50513 Aug 2025 (the filing on sec.gov)
D. E. Shaw & Co.6,755,151$726m0.51%Added+2,916,00714 Aug 2025 (the filing on sec.gov)
Capital Research Global Investors6,609,793$710m0.14%Added+665,82713 Aug 2025 (the filing on sec.gov)
Arrowstreet Capital LP6,529,918$701m0.50%Trimmed-224,73713 Aug 2025 (the filing on sec.gov)
Citadel Advisors LLC5,404,305$580m0.10%Trimmed-29,25014 Aug 2025 (the filing on sec.gov)
Two Sigma Advisers LP5,169,960$555m1.14%Added+964,00014 Aug 2025 (the filing on sec.gov)
Holocene Advisors LP4,181,034$449m1.10%Added+2,295,28214 Aug 2025 (the filing on sec.gov)
Millennium Management LLC† Value as filed implies a price far from other filers'.4,636,019$444m0.21%Trimmed-3,708,13714 Aug 2025 (the filing on sec.gov)
Farallon Capital Management LLC3,981,057$428m1.80%Added+218,30014 Aug 2025 (the filing on sec.gov)
Neuberger Berman Group LLC3,961,215$425m0.33%Added+44,27427 Oct 2026 (the filing on sec.gov)
AllianceBernstein LP3,288,536$353m0.12%Added+251,60114 Aug 2025 (the filing on sec.gov)
Viking Global Investors LP3,045,764$327m0.95%Added+669,00014 Aug 2025 (the filing on sec.gov)
Two Sigma Investments LP2,466,376$265m0.47%Added+25,62914 Aug 2025 (the filing on sec.gov)
Point72 Asset Management LP2,460,663$264m0.52%Added+580,12814 Aug 2025 (the filing on sec.gov)
Man Group PLC2,137,443$230m0.44%Added+1,308,71114 Aug 2025 (the filing on sec.gov)
Voloridge Investment Management LLC2,018,678$217m0.80%Newnew14 Aug 2025 (the filing on sec.gov)
AQR Capital Management LLC1,843,193$197m0.16%Added+687,36414 Aug 2025 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q1 2025 to Q2 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 (3)

Exited (1)

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…

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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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