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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 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 12 May 2026
Managers listing it
48
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q4 2025 and Q1 2026; 44 listed it in both
Shares listed
275,168,061
combined, among listed positions
Reported value
$17.3bn
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.

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 23 buyers (opened or added shares) and 27 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was -11,822,079.

Managers listing BSX in Q1 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q4 2025, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

48 of 48 holders

ActionFiling
Fidelity (FMR LLC)74,226,395$4.7bn0.25%Trimmed-23,160,54615 May 2026 (the filing on sec.gov)
D. E. Shaw & Co.24,312,352$1.5bn0.92%Added+13,063,14815 May 2026 (the filing on sec.gov)
Wellington Management Group LLP18,833,406$1.2bn0.22%Added+9,124,31715 May 2026 (the filing on sec.gov)
Janus Henderson Group Ltd16,497,366$1.0bn0.49%Added+3,907,98118 May 2026 (the filing on sec.gov)
Capital World Investors15,309,738$961m0.13%Trimmed-11,841,83713 May 2026 (the filing on sec.gov)
Arrowstreet Capital LP13,891,668$872m0.47%Added+2,856,04014 May 2026 (the filing on sec.gov)
MFS Investment Management10,996,572$717m0.24%Added+1,911,04414 May 2026 (the filing on sec.gov)
Two Sigma Investments LP9,411,231$591m0.48%Added+6,939,88715 May 2026 (the filing on sec.gov)
Invesco Ltd9,051,941$568m0.06%Trimmed-4,266,23612 May 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc7,873,368$494m0.06%Added+416,08215 May 2026 (the filing on sec.gov)
Farallon Capital Management LLC7,470,684$469m2.46%Added+31,12015 May 2026 (the filing on sec.gov)
Capital Research Global Investors7,080,887$444m0.07%Trimmed-3,16813 May 2026 (the filing on sec.gov)
Neuberger Berman Group LLC7,072,894$444m0.34%Added+3,062,63327 Oct 2026 (the filing on sec.gov)
AQR Capital Management LLC5,239,836$327m0.15%Added+4,142,09115 May 2026 (the filing on sec.gov)
Citadel Advisors LLC4,217,314$265munder 0.1%Trimmed-558,30415 May 2026 (the filing on sec.gov)
Maverick Capital Ltd4,195,089$263m3.04%Added+1,250,83515 May 2026 (the filing on sec.gov)
Jane Street Group LLC4,032,117$253munder 0.1%Added+238,88112 May 2026 (the filing on sec.gov)
Millennium Management LLC† Value as filed implies a price far from other filers'.4,337,804$241m0.10%Trimmed-6,926,98615 May 2026 (the filing on sec.gov)
Man Group PLC3,718,731$233m0.42%Trimmed-673,99415 May 2026 (the filing on sec.gov)
Point72 Asset Management LP3,687,315$231m0.30%Added+1,252,75215 May 2026 (the filing on sec.gov)
Marshall Wace LLP3,611,020$227m0.23%Added+653,78315 May 2026 (the filing on sec.gov)
Holocene Advisors LP3,428,736$215m0.52%Trimmed-1,042,35315 May 2026 (the filing on sec.gov)
Renaissance Technologies LLC3,152,005$198m0.31%Added+769,30014 May 2026 (the filing on sec.gov)
AllianceBernstein LP1,625,785$155m0.05%Trimmed-1,174,94415 May 2026 (the filing on sec.gov)
Squarepoint Ops LLC1,589,914$100m0.12%Trimmed-1,445,37415 May 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q4 2025 to Q1 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 (2)

Exited (4)

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

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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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