L3VLUP
ProSign in

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

Q3 2026: 5 of 95 managers have filed so far; the filing deadline is 16 November 2026. Its figures cover those filers only, so it is not yet a picture of the tracked managers.

Quarter end
30 Sep 2026
the date the book describes
Filed
9 Nov 2026
latest of these filings; the earliest 9 Nov 2026
Managers listing it
2
at least, of 95 tracked, among listed positions
Comparable managers
5
filed both Q2 2026 and Q3 2026; 2 listed it in both
Shares listed
1,643,979
combined, among listed positions
Reported value
$72m
combined, at the quarter end

Among the 5 comparable managers: 1 buyer (opened or added shares) and 1 seller (trimmed or exited), at least, among listed positions. Their net change in shares was -967,714.

Managers listing BSX in Q3 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q2 2026, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

2 of 2 holders

ActionFiling
Acadian Asset Management LLC1,293,175$56m0.07%Added+306,4119 Nov 2026 (the filing on sec.gov)
Squarepoint Ops LLC350,804$15munder 0.1%Trimmed-1,274,1259 Nov 2026 (the filing on sec.gov)

Largest increases and reductions, by shares

Q2 2026 to Q3 2026, 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 (0)

No new position among listed positions.

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 Q4 2024 to 1 in Q3 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
Q3 20261$56m11

Compare with…

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

BSX and LLY →BSX and JNJ →BSX and VRTX →Choose a stock to compare with BSX →

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.

Which funds own BSX, latest filings →Back to the 13F Explorer →