Who holds ticker verified against the SEC company list on 2026-09-10 — a reviewed name-and-class mapping row, never an inferred symbol. how tickers are mapped ↗

BOSTON SCIENTIFIC CORP · common stock (filed as COM) · Q1 2026 · 19 members disclosed BSX ↗
13F filers reporting this class for the quarter ended 2026-03-31; 1–500 of 1,354 holders are listed, largest first
1,354
sum of the reported values across every holder; undisclosed values are left out, never counted as zero
$74.5B
holders whose share count rose or who opened the position (new + add), by shares
692
holders absent this quarter after holding last quarter — inferred from absence, not a sale record
251
FILING WINDOW OPEN
Q3 2026 filings are due by 2026-11-16 — figures for that quarter will change; missing filers are not zeros.

Holders — quarter ended 2026-03-31

by reported value · Δ shares vs 2025-12-31Holders rank by reported value. The change kind — new, add, trim or exit — is read from the share count against the prior quarter, never from the reported value.
13F holders of BSX ranked by reported value, 1–25 of 1,354 holders
#FilerReported valueSharesΔ sharesChange
1BlackRock, Inc.$8.3B131,822,037−4,165,208TRIM
2VANGUARD CAPITAL MANAGEMENT LLC$6.0B96,411,568—NO PRIOR
3FMR LLC$4.7B74,226,395−23,160,546TRIM
4STATE STREET CORP$4.3B67,986,847+2,140,788ADD
5GEODE CAPITAL MANAGEMENT, LLC$2.1B33,285,757+901,992ADD
6PRIMECAP MANAGEMENT CO/CA/$2.0B32,529,774+1,433,590ADD
7VANGUARD PORTFOLIO MANAGEMENT LLC$1.9B29,796,211—NO PRIOR
8D. E. Shaw & Co., Inc.$1.5B24,312,352+13,063,148ADD
9BANK OF AMERICA CORP /DE/$1.4B22,756,646−2,358,539TRIM
10MORGAN STANLEY$1.4B22,266,664−693,892TRIM
11WELLINGTON MANAGEMENT GROUP LLP$1.2B18,833,406+9,124,317ADD
12Janus Henderson Group Ltd.$1.0B16,497,366+3,907,981ADD
13Capital World Investors$961M15,309,738−11,841,837TRIM
14UBS Group AG$930M14,824,662−47,464TRIM
15FRANKLIN RESOURCES INC$910M14,498,741+8,822,659ADD
16Amundi$886M14,122,913+1,707,754ADD
17ARROWSTREET CAPITAL, LIMITED PARTNERSHIP$872M13,891,668+2,856,040ADD
18UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC$848M13,513,771+2,576,814ADD
19NORTHERN TRUST CORP$839M13,373,881−561,542TRIM
20DZ BANK AG Deutsche Zentral Genossenschafts Bank, Frankfurt am Main$830M13,229,644−5,311,049TRIM
21Nuveen, LLC$736M11,734,314+2,362,020ADD
22MASSACHUSETTS FINANCIAL SERVICES CO /MA/$717M10,996,572+1,911,044ADD
23Legal & General Group Plc$665M10,600,766−275,851TRIM
24Assenagon Asset Management S.A.$631M10,057,936+5,751,760ADD
25Bank of New York Mellon Corp$599M9,543,875−1,680,922TRIM
Show the top 500 of 1,354 holders
Truncated by Public Filings. Top 500 of 1,354 holders shown; the rest are on EDGAR. Method ↗
Newest filing in this build: 2026-07-31. Per-row filing dates are on each receipt.

Congress ↔ notable managers · BSX

Congress · last 90 days

Buyers
1 Gilbert Ray Cisneros, Jr. D–CA-31 $1K–$15K
Sellers
1 Kevin Hern R–OK-1 $118K–$295K

filed 2026-07-31 → 2026-10-29 · statutory ranges

Use of congressional disclosure reports for commercial purposes, credit decisions or solicitation is restricted by 5 U.S.C. §13107(c).

Notable managers · quarter ended 2026-03-31

Adding
1 Gotham Asset Management $30.3M held

by shares · $ = value heldNEW + ADD vs TRIM + EXIT, by share count. $ = reported value now, not the change. · BOSTON SCIENTIFIC CORP

Merged timeline of congressional filings and notable-manager moves on BSX
DateWhoChangeSize
2026-09-25Kevin Hern CongressSELL$50K–$100K
2026-09-25Kevin Hern CongressSELL$50K–$100K
2026-09-25Kevin Hern CongressSELL$1K–$15K
2026-09-25Kevin Hern CongressSELL$1K–$15K
2026-09-25Kevin Hern CongressSELL$1K–$15K
2026-09-25Kevin Hern CongressSELL$15K–$50K
2026-09-10Gilbert Ray Cisneros, Jr. CongressBUY$1K–$15K
2026-05-15Gotham Asset Management 13FADD+323,810 sh
2026-05-15Tudor Investment Corp 13FTRIM−100,286 sh
2026-05-15Lone Pine Capital 13FTRIM−97,048 sh
2026-05-15Bridgewater Associates 13FTRIM−16,753 sh
2026-05-15Viking Global Investors 13FEXIT−2,509,808 sh
2026-05-14Caxton Associates 13FTRIM−11,307 sh

13 newest, by filing date · 13F rows are quarter-end snapshots, not trades

A 13F is a quarterly, long-only snapshot filed up to 45 days late — not current holdings. what a 13F covers ↗

13F reports cover LONG positions in Section 13(f) securities (US exchange-traded equities plus reportable options, warrants, certain convertibles) held by managers with at least $100M in such securities — so managers below that threshold are absent entirely. No short positions, no cash, no non-13(f) assets — not a full portfolio, and not a census of institutional ownership.

Positions are quarter-end snapshots filed up to 45 days late — not current holdings: a position may have changed or closed since the quarter ended.

Values are the manager's stated market value at quarter-end in era-dependent units (whole dollars for form versions effective 2023-01-03 onward, thousands before), normalized here to whole dollars; each record notes its original unit.

Affiliated managers may report the same position, so one position can appear under more than one filer.

Positions under confidential treatment may be omitted until a later amendment discloses them.

These are disclosures, not investment advice.