Which funds own BSX
Boston Scientific Corp in the Q2 2026 filings. 25 of the 94 managers on file reported a position, worth $11.2bn between them. A fifth of the managers on file hold it, which is a crowd without being the whole market. The quarter went one way: 19 managers opened or added against 9 cutting.
- Managers holding
- 25
- of 94 on file
- Combined value
- $11.2bn
- as reported
- Opened
- 2
- new this quarter
- Added to
- 17
- already held
- Trimmed or sold out
- 9
- 3 sold out entirely
Every manager on file with a position
Largest first. Weight is the share of that manager’s whole reported book, which is the number worth quoting: $400m is a rounding error in one book and a defining bet in another.
| Manager | Value | Weight | Shares | Change on the quarter | Action |
|---|---|---|---|---|---|
| Fidelity (FMR LLC) Long-only · $2304bn book | $2.0bn | 0.1% | 45,702,845 | -$2.7bn-28,523,550 | Trimmed |
| MFS Investment Management Long-only · $315bn book | $1.5bn | 0.5% | 24,859,191 | +$781m+13,862,619 | Added |
| D. E. Shaw & Co. Quantitative · $210bn book | $1.1bn | 0.5% | 25,457,409 | -$439m+1,145,057 | Added |
| Janus Henderson Group Ltd Long-only · $209bn book · Q1 2026 filing | $1.0bn | 0.5% | 16,497,366 | -$165m+3,907,981 | Added |
| Arrowstreet Capital LP Quantitative · $225bn book | $994m | 0.4% | 23,293,913 | +$123m+9,402,245 | Added |
| Two Sigma Investments LP Quantitative · $138bn book | $826m | 0.6% | 19,359,023 | +$236m+9,947,792 | Added |
| Capital World Investors Long-only · $846bn book | $718m | 0.1% | 16,812,257 | -$243m+1,502,519 | Added |
| Wellington Management Group LLP Long-only · $580bn book | $653m | 0.1% | 15,301,828 | -$529m-3,531,578 | Trimmed |
| Capital Research Global Investors Long-only · $717bn book | $605m | 0.1% | 14,180,571 | +$161m+7,099,684 | Added |
| Farallon Capital Management LLC Long/short equity · $21.7bn book | $449m | 2.1% | 10,521,184 | -$20m+3,050,500 | Added |
| AQR Capital Management LLC Quantitative · $287bn book | $413m | 0.1% | 9,681,750 | +$86m+4,441,914 | Added |
| Maverick Capital Ltd Long/short equity · $11.3bn book | $253m | 2.2% | 5,937,553 | -$9.8m+1,742,464 | Added |
| Voloridge Investment Management LLC Quantitative · $23.5bn book | $140m | 0.6% | 3,275,326 | +$72m+2,197,217 | Added |
| Man Group PLC Quantitative · $62.7bn book | $138m | 0.2% | 3,225,164 | -$96m-493,567 | Trimmed |
| Marshall Wace LLP Quantitative · $127bn book | $103m | 0.1% | 2,414,223 | -$124m-1,196,797 | Trimmed |
| Renaissance Technologies LLC Quantitative · $72.6bn book | $103m | 0.1% | 2,412,005 | -$95m-740,000 | Trimmed |
| Walleye Capital LLC Multi-strategy · $28.0bn book | $67m | 0.2% | 1,578,172 | +$15m+742,220 | Added |
| Tudor Investment Corp Macro · $71.9bn book | $63m | 0.1% | 1,477,637 | +$23m+845,085 | Added |
| Schonfeld Strategic Advisors LLC Multi-strategy · $27.9bn book | $57m | 0.2% | 1,326,951 | -$13m+221,436 | Added |
| Hudson Bay Capital Management LP Multi-strategy · $36.8bn book | $32m | 0.1% | 742,896 | +$1.3m+258,896 | Added |
| ExodusPoint Capital Management LP Multi-strategy · $15.5bn book | $22m | 0.1% | 504,948 | +$2.0m+193,585 | Added |
| Quantbot Technologies LP Quantitative · $2.5bn book | $10m | 0.4% | 235,949 | +$5.4m+162,240 | Added |
| Moore Capital Management LP Macro · $6.7bn book | $8.1m | 0.1% | 189,256 | opened189,256 | New |
| Glenview Capital Management LLC Long/short equity · $5.5bn book | $4.8m | 0.1% | 113,096 | opened113,096 | New |
| Dodge & Cox Activist · $191bn book | $3.7m | 0.0% | 87,485 | -$1.8m-1,400 | Trimmed |
Sold out of this quarter
Valued at what the position was worth in the previous filing, because by this one it is gone.
- Lone Pine Capital LLC · Long/short equity$6.6m held before
- Winton Group Ltd · Quantitative$5.2m held before
- Davidson Kempner Capital Management LP · Long/short equity$4.0m held before
Reported as options rather than shares
A put or a call on a name is not a position in it, and the filing states the notional rather than what the option cost. These lines are listed apart for that reason and are not counted in anything above.
- Holocene Advisors LP · calls$180m notional
- Rokos Capital Management LLP · calls$20m notional
What BSX is worth
Knowing who owns it is half the question. The other half is what it is worth against the companies it trades beside, which is the one an interviewer will follow up with.
Build the comp set around BSX →How much of the picture this is
A Form 13F reports US-listed long equity and nothing else: no shorts, no bonds, no cash and no non-US listings. It arrives forty-five days after the quarter ends, so a manager who sold in July still shows the position in a filing published in August. This page reads the managers on file here rather than every filer in the market, and each manager’s largest positions rather than the whole table, so a small position in a very large book may not appear. Say “their last filing showed” rather than “they own”, and the distinction will do you credit.
What to do with a name the funds are buying
Knowing who owns something is the start of a pitch, not the pitch. The next questions are what it is worth and why they were buying.
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The holdings, every quarter, and the week between
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