BOSTON SCIENTIFIC CORP (BSX) Institutional Shareholders
BOSTON SCIENTIFIC CORP (BSX) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended March 31, 2026. The institutional investors covered on this page collectively reported approximately $77.77B in BSX holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of BSX tracked by InsiderSet, reporting ownership valued at approximately $8.27B in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $6.00B, representing an estimated loss of -27.47% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 43% of the total disclosed BSX value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Vanguard Capital Management Llc, Fmr Llc, and several other long-term asset managers with concentrated positions in BOSTON SCIENTIFIC CORP (BSX).
This page ranks the largest institutional BSX shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
1,555
Total Reported Value
$77.77B
Largest Holder
Blackrock, Inc.
Largest Position
$8.27B
Insider Transactions (90d)
7
Latest Filing Quarter
Q2 2026
New Institutional Positions
25
Funds Exiting Positions
1
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.15% | 131,822,037 | $8,271,832,842 | $5,999,220,904 | -$2,272,611,938 | -27.47% | |
| Vanguard Capital Management Llc | 0.15% | 96,411,568 | $6,049,825,893 | $4,387,690,460 | -$1,662,135,433 | -27.47% | |
| Fmr Llc | 0.25% | 74,226,395 | $4,657,706,307 | $3,378,043,236 | -$1,279,663,071 | -27.47% | |
| State Street Corp | 0.15% | 67,986,847 | $4,266,174,649 | $3,094,081,407 | -$1,172,093,242 | -27.47% | |
| Geode Capital Management, Llc | 0.13% | 33,285,757 | $2,079,209,964 | $1,514,834,801 | -$564,375,163 | -27.14% | |
| Primecap Management Co/Ca/ | 1.61% | 32,529,774 | $2,041,243,323 | $1,480,430,015 | -$560,813,308 | -27.47% | |
| Vanguard Portfolio Management Llc | 0.10% | 29,796,211 | $1,869,712,240 | $1,356,025,563 | -$513,686,677 | -27.47% | |
| D. E. Shaw & Co., Inc. | 1.20% | 24,312,352 | $1,525,600,089 | $1,106,455,140 | -$419,144,949 | -27.47% | |
| Bank Of America Corp | 0.10% | 22,756,646 | $1,427,979,507 | $1,035,654,959 | -$392,324,548 | -27.47% | |
| Morgan Stanley | 0.08% | 22,266,664 | $1,397,233,394 | $1,013,355,879 | -$383,877,515 | -27.47% | |
| Goldman Sachs Group Inc | 0.16% | 18,891,624 | $1,185,449,314 | $859,757,808 | -$325,691,506 | -27.47% | |
| Wellington Management Group Llp | 0.22% | 18,833,406 | $1,181,796,227 | $857,108,307 | -$324,687,920 | -27.47% | |
| Janus Henderson Group Plc | 0.51% | 16,497,366 | $1,035,201,522 | $750,795,127 | -$284,406,395 | -27.47% | |
| Capital World Investors | 0.13% | 15,309,738 | $960,698,017 | $696,746,176 | -$263,951,841 | -27.48% | |
| Ubs Group Ag | 0.17% | 14,824,662 | $930,247,542 | $674,670,368 | -$255,577,174 | -27.47% | |
| Franklin Resources Inc | 0.22% | 14,498,741 | $909,795,997 | $659,837,703 | -$249,958,294 | -27.47% | |
| Amundi | 0.24% | 14,122,913 | $886,212,794 | $642,733,771 | -$243,479,023 | -27.47% | |
| Arrowstreet Capital, Limited Partnership | 0.47% | 13,891,668 | $871,702,167 | $632,209,811 | -$239,492,356 | -27.47% | |
| Ubs Am, A Distinct Business Unit Of Ubs Asset Management Americas Llc | 0.18% | 13,513,771 | $847,989,132 | $615,011,718 | -$232,977,414 | -27.47% | |
| Northern Trust Corp | 0.11% | 13,373,881 | $839,211,032 | $608,645,324 | -$230,565,708 | -27.47% | |
| Dz Bank Ag Deutsche Zentral Genossenschafts Bank, Frankfurt Am Main | 0.76% | 13,229,644 | $830,160,128 | $602,081,098 | -$228,079,030 | -27.47% | |
| Nuveen, Llc | 0.20% | 11,734,314 | $736,328,204 | $534,028,630 | -$202,299,574 | -27.47% | |
| Massachusetts Financial Services Co | 0.24% | 10,996,572 | $716,915,674 | $500,453,992 | -$216,461,682 | -30.19% | |
| Legal & General Group Plc | 0.15% | 10,600,766 | $665,198,075 | $482,440,861 | -$182,757,214 | -27.47% | |
| Storebrand Asset Management As | 0.21% | 13,757,932 | $612,705,074 | $626,123,485 | +$13,418,411 | +2.19% | |
| Bank Of New York Mellon Corp | 0.11% | 9,543,875 | $598,878,115 | $434,341,751 | -$164,536,364 | -27.47% | |
| Two Sigma Investments, Lp | 0.49% | 9,411,231 | $590,554,745 | $428,305,123 | -$162,249,622 | -27.47% | |
| Charles Schwab Investment Management Inc | 0.09% | 9,170,180 | $575,428,795 | $417,334,892 | -$158,093,903 | -27.47% | |
| Invesco Ltd. | 0.09% | 9,051,941 | $568,009,309 | $411,953,835 | -$156,055,474 | -27.47% | |
| Vanguard Fiduciary Trust Co | 0.13% | 8,382,185 | $525,982,109 | $381,473,239 | -$144,508,870 | -27.47% | |
| Canada Pension Plan Investment Board | 0.33% | 8,035,947 | $504,255,674 | $365,715,948 | -$138,539,726 | -27.47% | |
| Parnassus Endeavor Fund | Parnassus Investments | 1.47% | 8,003,820 | $502,239,705 | $364,253,848 | -$137,985,857 | -27.47% |
| Vontobel Holding Ltd. | 1.72% | 7,978,214 | $500,632,930 | $363,088,519 | -$137,544,411 | -27.47% | |
| Edgewood Management Llc | 3.09% | 7,629,399 | $478,744,787 | $347,213,948 | -$131,530,839 | -27.47% | |
| Farallon Capital Management Llc | 3.06% | 7,470,684 | $468,785,421 | $339,990,829 | -$128,794,592 | -27.47% | |
| 1832 Asset Management L.P. | 0.60% | 7,252,746 | $455,109,812 | $330,072,470 | -$125,037,342 | -27.47% | |
| Schroder Investment Management Group | 0.37% | 7,252,007 | $455,063,439 | $330,038,839 | -$125,024,600 | -27.47% | |
| Capital Research Global Investors | 0.07% | 7,080,887 | $444,327,432 | $322,251,167 | -$122,076,265 | -27.47% | |
| Neuberger Berman Group Llc | 0.34% | 7,072,894 | $443,824,104 | $321,887,406 | -$121,936,698 | -27.47% | |
| Bnp Paribas Asset Management Holding S.A. | 0.51% | 6,966,229 | $437,307,513 | $317,033,082 | -$120,274,431 | -27.50% | |
| Deutsche Bank Ag\ | 0.14% | 6,653,275 | $417,493,008 | $302,790,545 | -$114,702,463 | -27.47% | |
| Royal Bank Of Canada | 0.07% | 6,273,263 | $393,647,000 | $285,496,199 | -$108,150,801 | -27.47% | |
| Dimensional Fund Advisors Lp | 0.08% | 6,097,777 | $382,667,986 | $277,509,831 | -$105,158,155 | -27.48% | |
| Qube Research & Technologies Ltd | 0.50% | 5,569,880 | $349,509,970 | $253,485,239 | -$96,024,731 | -27.47% | |
| Ameriprise Financial Inc | 0.08% | 5,573,439 | $349,446,539 | $253,647,209 | -$95,799,330 | -27.41% | |
| Aqr Capital Management Llc | 0.15% | 5,239,836 | $327,280,182 | $238,464,936 | -$88,815,246 | -27.14% | |
| Pictet Asset Management Holding Sa | 0.34% | 5,120,057 | $321,300,991 | $233,013,794 | -$88,287,197 | -27.48% | |
| Bnp Paribas Financial Markets | 0.21% | 5,101,806 | $320,138,326 | $232,183,191 | -$87,955,135 | -27.47% | |
| Barclays Plc | 0.11% | 5,024,157 | $315,265,859 | $228,649,385 | -$86,616,474 | -27.47% | |
| First Manhattan Co. Llc. | 0.85% | 4,911,217 | $308,178,867 | $223,509,486 | -$84,669,381 | -27.47% |
Frequently asked questions about BSX
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Who owns the most BSX stock?
The largest holders of BSX are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for BOSTON SCIENTIFIC CORP (BSX).
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Is BSX widely held by superinvestors?
Many widely followed stocks like BSX appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly BSX is represented among the institutional managers we track.
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What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.