Standard Biotools Inc.: which funds bought and sold

Institutions that bought and sold Standard Biotools shares in Q2 2026, from the holdings they reported to the SEC on Form 13F for March 31, 2026 and June 30, 2026.

Between March 31, 2026 and June 30, 2026, 88 institutions that filed 13F reports for both quarters added to or opened positions in Standard Biotools, and 87 cut or closed them. Together they sold a net 948K shares, −0.3% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 24.0M shares (+13.4%); index fund managers were net sellers of 29.9M shares (−48.9%). 42 opened a new position and 51 sold out entirely.

Bought, Q2 2026 88 institutions, 42 of them new holders Sold, Q2 2026 87 institutions, 51 of them sold out

Net change, all compared −948K shares (−0.3%)

Net change, active managers +24.0M shares (+13.4%), 24 bought, 8 sold

Buyers versus sellers

institutions compared, 193

88 bought 18 87 sold

Active managers and hedge funds 24 bought · 8 sold · +24.0M

Index fund managers 0 bought · 11 sold · −29.9M

Other institutions 64 bought · 68 sold · +4.9M

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Long Focus Capital Management, LLC Hedge fund	+7.5M +46.7%	23.5M	$19.3M
Qube Research & Technologies Ltd Hedge fund	+4.1M +584.3%	4.8M	$4M
Mak Capital One LLC	+2.6M +10.1%	28.8M	$23.7M
D. E. Shaw & Co., Inc. Hedge fund	+2.6M +1315.5%	2.8M	$2.3M
Jane Street Group, LLC	+2.5M New position	2.5M	$2.1M
Mink Brook Asset Management LLC	+2.2M New position	2.2M	$1.8M
Arrowstreet Capital, Limited Partnership Hedge fund	+2.0M New position	2.0M	$1.6M
Jacobs Levy Equity Management, Inc Active manager	+1.6M New position	1.6M	$1.3M
Royce & Associates LP Active manager	+1.5M +50.6%	4.5M	$3.7M
Millennium Management LLC Hedge fund	+1.4M +67.1%	3.5M	$2.9M
Loews Corp	+1.3M New position	1.3M	$1M
Citadel Advisors LLC Hedge fund	+1.1M +91.7%	2.3M	$1.9M
Renaissance Technologies LLC Hedge fund	+992K New position	992K	$816,166
Gsa Capital Partners LLP	+834K +236.0%	1.2M	$977,000
Man Group PLC Hedge fund	+743K New position	743K	$611,096
Point72 Asset Management, L.P. Hedge fund	+663K +1483.1%	708K	$582,464
Aster Capital Management (Difc) Ltd	+541K New position	541K	$445,188
Jain Global LLC Hedge fund	+467K New position	467K	$384,462
AQR Capital Management LLC Hedge fund	+426K +45.6%	1.4M	$1.1M
Peapod Lane Capital LLC	+383K +18.9%	2.4M	$2M

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Long Focus Capital Management, LLC Hedge fund	+7.5M +46.7%	23.5M	$19.3M
Qube Research & Technologies Ltd Hedge fund	+4.1M +584.3%	4.8M	$4M
D. E. Shaw & Co., Inc. Hedge fund	+2.6M +1315.5%	2.8M	$2.3M
Arrowstreet Capital, Limited Partnership Hedge fund	+2.0M New position	2.0M	$1.6M
Jacobs Levy Equity Management, Inc Active manager	+1.6M New position	1.6M	$1.3M
Royce & Associates LP Active manager	+1.5M +50.6%	4.5M	$3.7M
Millennium Management LLC Hedge fund	+1.4M +67.1%	3.5M	$2.9M
Citadel Advisors LLC Hedge fund	+1.1M +91.7%	2.3M	$1.9M
Renaissance Technologies LLC Hedge fund	+992K New position	992K	$816,166
Man Group PLC Hedge fund	+743K New position	743K	$611,096

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Blackrock, Inc. Index funds	−16.5M −66.7%	8.3M	$6.8M
State Street Corp Index funds	−5.0M −76.5%	1.5M	$1.3M
Geode Capital Management, LLC Index funds	−3.4M −46.5%	3.9M	$3.2M
Barclays PLC	−2.6M −98.3%	44K	$36,133
Vanguard Portfolio Management LLC Index funds	−1.7M −71.8%	675K	$555,305
Northern Trust Corp Index funds	−1.7M −67.7%	792K	$651,188
Slate Path Capital LP Hedge fund	−1.6M Sold out	0	—
Goldman Sachs Group Inc	−727K −77.1%	216K	$178,051
Bank Of New York Mellon Corp	−677K −88.2%	90K	$74,274
Nuveen, LLC	−661K Sold out	0	—
Charles Schwab Investment Management Inc Index funds	−656K −27.2%	1.8M	$1.4M
Vanguard Capital Management LLC Index funds	−563K −4.4%	12.3M	$10.1M
UBS Am, A Distinct Business Unit Of UBS Asset Management Americas LLC	−520K Sold out	0	—
Swiss National Bank	−490K Sold out	0	—
Alliancebernstein L.P. Active manager	−316K Sold out	0	—
Deutsche Bank Ag\	−286K Sold out	0	—
Rhumbline Advisers Index funds	−267K −73.0%	98K	$80,965
California State Teachers Retirement System	−236K Sold out	0	—
Price T Rowe Associates Inc Active manager	−202K Sold out	0	—
Bank Of America Corp	−176K −42.0%	244K	$200,637

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Slate Path Capital LP Hedge fund	−1.6M Sold out	0	—
Alliancebernstein L.P. Active manager	−316K Sold out	0	—
Price T Rowe Associates Inc Active manager	−202K Sold out	0	—
Quadrature Capital Ltd Hedge fund	−115K Sold out	0	—
Intech Investment Management LLC Active manager	−63K Sold out	0	—
Corvex Management LP Hedge fund	−44K Sold out	0	—
FMR LLC Active manager	−13K −80.9%	3,153	$2,594
Boothbay Fund Management, LLC Hedge fund	−1,848 −2.5%	71K	$58,214

New positions

largest by value

Institution	Shares	Value June 30, 2026
Jane Street Group, LLC	2.5M	$2.1M
Mink Brook Asset Management LLC	2.2M	$1.8M
Arrowstreet Capital, Limited PartnershipHedge fund	2.0M	$1.6M
Jacobs Levy Equity Management, IncActive manager	1.6M	$1.3M
Loews Corp	1.3M	$1M
Renaissance Technologies LLCHedge fund	992K	$816,166
Man Group PLCHedge fund	743K	$611,096
Aster Capital Management (Difc) Ltd	541K	$445,188
Jain Global LLCHedge fund	467K	$384,462
Marquette Asset Management, LLC	325K	$267,662

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Slate Path Capital LPHedge fund	1.6M	$1.5M
Nuveen, LLC	661K	$607,845
UBS Am, A Distinct Business Unit Of UBS Asset Management Americas LLC	520K	$477,680
Swiss National Bank	490K	$450,144
Alliancebernstein L.P.Active manager	316K	$404,083
Deutsche Bank Ag\	286K	$262,913
California State Teachers Retirement System	236K	$216,884
Price T Rowe Associates IncActive manager	202K	$187,000
Legal & General Group PLC	160K	$146,665
State Of Wisconsin Investment Board	145K	$132,955

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 143
Ten largest holders: 81.1%
Index fund managers: 10.5%
Active managers and hedge funds: 68.6%

Buying and selling by type of institution, March 31, 2026 to June 30, 2026
Type	Bought	Sold	New	Sold out	Net change in shares	Net %
Active managers and hedge funds	24	8	14	6	+24.0M	+13.4%
Index fund managers	0	11	0	2	−29.9M	−48.9%
Other institutions	64	68	28	43	+4.9M	+8.5%

Active managers and hedge funds: a list we maintain of about 400 well-known stock-picking firms and hedge funds, matched by SEC registration number (CIK) and checked against the filer names each quarter. Index fund managers: the large index houses, such as BlackRock, Vanguard, State Street, Geode and Northern Trust. Every other filer (banks, brokers, wealth managers, pension funds, insurers and firms not on the list) counts as another institution. A firm that files under several SEC registrations appears once for each.

What these filings can and cannot tell you

Form 13F lists the long positions in US-listed shares held by investment managers with more than $100 million in such holdings. Managers file it up to 45 days after each quarter ends, so this page shows what funds held at the end of each quarter, not what they are doing now: a position may have changed since. Short positions, most derivatives and smaller managers are not included, and a cut can mean a fund lost clients or rebalanced rather than a view on Standard Biotools.

Only managers that filed a holdings report for both quarters are compared (193 here). 5 other holders are left out: first-time or late filers, firms that changed their SEC registration, and filings that withheld positions under confidential treatment, any of which would otherwise look like a new position or a sale. Figures are as reported by each manager in the SEC's quarterly 13F data sets; option positions are excluded.

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