Charles River Laboratories: which funds bought and sold

Institutions that bought and sold Charles River Laboratories 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, 266 institutions that filed 13F reports for both quarters added to or opened positions in Charles River Laboratories, and 262 cut or closed them. Together they sold a net 1.1M shares, −1.9% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 5,240 shares (+0.0%); index fund managers were net sellers of 216K shares (−1.6%). 71 opened a new position and 60 sold out entirely.

Bought, Q2 2026 266 institutions, 71 of them new holders Sold, Q2 2026 262 institutions, 60 of them sold out

Net change, all compared −1.1M shares (−1.9%)

Net change, active managers +5,240 shares (+0.0%), 29 bought, 39 sold

Buyers versus sellers

institutions compared, 620

266 bought 92 262 sold

Active managers and hedge funds 29 bought · 39 sold · +5,240

Index fund managers 4 bought · 8 sold · −216K

Other institutions 233 bought · 215 sold · −895K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
FMR LLC Active manager	+784K +22.7%	4.2M	$962M
Invesco Ltd.	+588K +24.5%	3.0M	$677M
Price T Rowe Associates Inc Active manager	+380K +33.8%	1.5M	$341M
Citigroup Inc	+235K +288.9%	316K	$71.7M
Goldman Sachs Group Inc	+225K +54.3%	640K	$145M
Marshall Wace, LLP Hedge fund	+193K +129.2%	343K	$77.8M
SRS Investment Management, LLC Hedge fund	+187K New position	187K	$42.5M
Clearbridge Investments, LLC Active manager	+149K +23.5%	781K	$177M
Earnest Partners LLC Active manager	+149K +15.3%	1.1M	$254M
Perceptive Advisors LLC Hedge fund	+140K New position	140K	$31.8M
BNP Paribas Asset Management Holding S.A.	+136K +1390.9%	146K	$33.2M
Assenagon Asset Management S.A.	+101K +456.7%	124K	$28M
Harris Associates L P Active manager	+88K +4.1%	2.2M	$508M
Nomura Holdings Inc	+82K +1806.5%	87K	$19.7M
Gotham Asset Management, LLC Hedge fund	+75K +20.8%	433K	$98.2M
Alliancebernstein L.P. Active manager	+73K +24.0%	375K	$64.6M
Fil Ltd Active manager	+67K +150.1%	111K	$25.2M
Lakewood Capital Management, LP Hedge fund	+65K +94.2%	134K	$30.4M
Raymond James Financial Inc	+63K +32.7%	257K	$58.2M
Ariel Investments, LLC Active manager	+62K +4.3%	1.5M	$342M

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
FMR LLC Active manager	+784K +22.7%	4.2M	$962M
Price T Rowe Associates Inc Active manager	+380K +33.8%	1.5M	$341M
Marshall Wace, LLP Hedge fund	+193K +129.2%	343K	$77.8M
SRS Investment Management, LLC Hedge fund	+187K New position	187K	$42.5M
Clearbridge Investments, LLC Active manager	+149K +23.5%	781K	$177M
Earnest Partners LLC Active manager	+149K +15.3%	1.1M	$254M
Perceptive Advisors LLC Hedge fund	+140K New position	140K	$31.8M
Harris Associates L P Active manager	+88K +4.1%	2.2M	$508M
Gotham Asset Management, LLC Hedge fund	+75K +20.8%	433K	$98.2M
Alliancebernstein L.P. Active manager	+73K +24.0%	375K	$64.6M

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Mackenzie Financial Corp	−593K −99.7%	1,546	$350,617
Van Berkom & Associates Inc.	−553K −55.2%	449K	$102M
Arrowstreet Capital, Limited Partnership Hedge fund	−458K −62.2%	279K	$63.2M
Millennium Management LLC Hedge fund	−448K −47.9%	486K	$110M
Amundi	−361K −46.7%	412K	$93.5M
Wellington Management Group LLP Active manager	−341K −20.9%	1.3M	$292M
Alyeska Investment Group, L.P. Hedge fund	−324K −57.9%	235K	$53.3M
Ameriprise Financial Inc	−228K −20.6%	881K	$200M
Massachusetts Financial Services Co Active manager	−227K −24.9%	682K	$158M
Macquarie Group Ltd	−199K −98.9%	2,168	$491,681
Barclays PLC	−181K −77.1%	54K	$12.2M
SG Americas Securities, LLC	−169K −90.6%	17K	$4M
D. E. Shaw & Co., Inc. Hedge fund	−162K −83.7%	32K	$7.2M
Ilex Capital Partners (UK) LLP	−115K −58.7%	81K	$18.4M
Meridiem Capital Partners LP	−115K −31.8%	247K	$56M
Cooke & Bieler LP Active manager	−112K −12.9%	756K	$171M
Allspring Global Investments Holdings, LLC	−88K −4.4%	1.9M	$436M
UBS Group AG	−85K −11.6%	647K	$147M
Vanguard Portfolio Management LLC Index funds	−84K −3.6%	2.2M	$501M
Victory Capital Management Inc Active manager	−79K −10.6%	665K	$151M

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Arrowstreet Capital, Limited Partnership Hedge fund	−458K −62.2%	279K	$63.2M
Millennium Management LLC Hedge fund	−448K −47.9%	486K	$110M
Wellington Management Group LLP Active manager	−341K −20.9%	1.3M	$292M
Alyeska Investment Group, L.P. Hedge fund	−324K −57.9%	235K	$53.3M
Massachusetts Financial Services Co Active manager	−227K −24.9%	682K	$158M
D. E. Shaw & Co., Inc. Hedge fund	−162K −83.7%	32K	$7.2M
Cooke & Bieler LP Active manager	−112K −12.9%	756K	$171M
Victory Capital Management Inc Active manager	−79K −10.6%	665K	$151M
Engineers Gate Manager LP Hedge fund	−65K −68.8%	29K	$6.6M
Adage Capital Partners Gp, L.L.C. Hedge fund	−43K −16.6%	213K	$48.4M

New positions

largest by value

Institution	Shares	Value June 30, 2026
SRS Investment Management, LLCHedge fund	187K	$42.5M
Perceptive Advisors LLCHedge fund	140K	$31.8M
Atika Capital Management LLC	38K	$8.6M
Pine Ridge Advisers LLC	34K	$7.7M
Capricorn Fund Managers Ltd	31K	$7.1M
Lrt Capital Management, LLC	24K	$5.3M
Pinnbrook Capital Management LP	21K	$4.8M
Simplex Trading, LLC	19K	$4.4M
Pfm Health Sciences, LPHedge fund	19K	$4.3M
Jefferies Financial Group Inc.	18K	$4.1M

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Connor, Clark & Lunn Investment Management Ltd.	55K	$9.4M
Omers Administration Corp	54K	$9.4M
Caisse De Depot Et Placement Du Quebec	40K	$7M
Longaeva Partners L.P.	37K	$6.3M
Two Sigma Investments, LPHedge fund	21K	$3.6M
PDT Partners, LLCHedge fund	19K	$3.3M
Verition Fund Management LLCHedge fund	18K	$3.1M
Cm Management, LLC	18K	$3M
Exoduspoint Capital Management, LPHedge fund	14K	$2.5M
Broyhill Asset Management, LLC	13K	$2.2M

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 567
Ten largest holders: 45.0%
Index fund managers: 24.0%
Active managers and hedge funds: 38.4%

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	29	39	8	7	+5,240	+0.0%
Index fund managers	4	8	0	0	−216K	−1.6%
Other institutions	233	215	63	53	−895K	−4.1%

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 Charles River Laboratories.

Only managers that filed a holdings report for both quarters are compared (620 here). 16 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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