Definitive Healthcare Corp.: which funds bought and sold

Institutions that bought and sold Definitive Healthcare 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, 53 institutions that filed 13F reports for both quarters added to or opened positions in Definitive Healthcare, and 69 cut or closed them. Together they sold a net 2.1M shares, −2.4% on what they held at the start of the quarter. Active managers and hedge funds on our list were net buyers of 1.8M shares (+27.7%); index fund managers were net sellers of 3.5M shares (−43.0%). 19 opened a new position and 34 sold out entirely.

Bought, Q2 2026 53 institutions, 19 of them new holders Sold, Q2 2026 69 institutions, 34 of them sold out

Net change, all compared −2.1M shares (−2.4%)

Net change, active managers +1.8M shares (+27.7%), 13 bought, 13 sold

Buyers versus sellers

institutions compared, 132

53 bought 10 69 sold

Active managers and hedge funds 13 bought · 13 sold · +1.8M

Index fund managers 0 bought · 10 sold · −3.5M

Other institutions 40 bought · 46 sold · −395K

Biggest buyers

by change in shares held

Biggest buyers
Institution	Change in shares	Shares June 30, 2026	Value
Kennedy Capital Management LLC Active manager	+1.7M New position	1.7M	$1.4M
Corient Private Wealth LP	+454K New position	454K	$377,633
Two Sigma Investments, LP Hedge fund	+276K +118.1%	509K	$423,201
Acadian Asset Management LLC Active manager	+245K +120.6%	449K	$368,000
AQR Capital Management LLC Hedge fund	+197K +28.1%	899K	$747,087
Gsa Capital Partners LLP	+190K +56.7%	526K	$437,000
Sei Investments Co	+182K New position	182K	$150,837
Jacobs Levy Equity Management, Inc Active manager	+173K +57.8%	473K	$392,775
Xtx Topco Ltd	+112K +475.9%	135K	$112,479
Squarepoint Ops LLC Hedge fund	+112K +46.5%	352K	$292,124
Marshall Wace, LLP Hedge fund	+90K +123.0%	164K	$136,103
Citigroup Inc	+75K +3926.4%	77K	$64,201
Bridgeway Capital Management, LLC Active manager	+50K +113.1%	94K	$78,271
Jain Global LLC Hedge fund	+49K New position	49K	$40,525
Williams & Novak, LLC	+48K +155.8%	79K	$65,317
Ieq Capital, LLC	+46K +83.9%	101K	$84,121
Blair William & Co	+40K New position	40K	$33,419
Balyasny Asset Management L.P. Hedge fund	+38K New position	38K	$31,983
Jane Street Group, LLC	+28K +68.2%	69K	$57,618
Mariner, LLC	+25K +162.0%	40K	$33,171

Biggest buyers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Kennedy Capital Management LLC Active manager	+1.7M New position	1.7M	$1.4M
Two Sigma Investments, LP Hedge fund	+276K +118.1%	509K	$423,201
Acadian Asset Management LLC Active manager	+245K +120.6%	449K	$368,000
AQR Capital Management LLC Hedge fund	+197K +28.1%	899K	$747,087
Jacobs Levy Equity Management, Inc Active manager	+173K +57.8%	473K	$392,775
Squarepoint Ops LLC Hedge fund	+112K +46.5%	352K	$292,124
Marshall Wace, LLP Hedge fund	+90K +123.0%	164K	$136,103
Bridgeway Capital Management, LLC Active manager	+50K +113.1%	94K	$78,271
Jain Global LLC Hedge fund	+49K New position	49K	$40,525
Balyasny Asset Management L.P. Hedge fund	+38K New position	38K	$31,983

Biggest sellers

by change in shares held

Biggest sellers
Institution	Change in shares	Shares June 30, 2026	Value
Blackrock, Inc. Index funds	−1.6M −52.8%	1.4M	$1.2M
Geode Capital Management, LLC Index funds	−629K −53.3%	551K	$457,944
State Street Corp Index funds	−615K −71.8%	242K	$200,804
Northern Trust Corp Index funds	−332K −76.1%	104K	$86,685
Millennium Management LLC Hedge fund	−314K −53.3%	276K	$229,242
Citadel Advisors LLC Hedge fund	−267K −61.6%	166K	$138,171
Clark Estates Inc	−240K Sold out	0	—
Vanguard Portfolio Management LLC Index funds	−232K −80.9%	55K	$45,382
Dimensional Fund Advisors LP	−213K −12.8%	1.5M	$1.2M
Morgan Stanley	−170K −40.1%	254K	$211,172
Stifel Financial Corp	−138K −84.0%	26K	$21,854
D. E. Shaw & Co., Inc. Hedge fund	−126K −6.0%	2.0M	$1.6M
Alliancebernstein L.P. Active manager	−123K Sold out	0	—
Cambria Investment Management, L.P.	−117K Sold out	0	—
Panagora Asset Management Inc Active manager	−115K Sold out	0	—
Bank Of New York Mellon Corp	−113K −58.2%	81K	$67,708
Deutsche Bank Ag\	−90K Sold out	0	—
Goldman Sachs Group Inc	−85K −1.4%	6.0M	$5M
Vanguard Global Advisers, LLC	−77K −82.5%	16K	$13,545
Hillsdale Investment Management Inc.	−75K Sold out	0	—

Biggest sellers, active managers and hedge funds
Institution	Change in shares	Shares June 30, 2026	Value
Millennium Management LLC Hedge fund	−314K −53.3%	276K	$229,242
Citadel Advisors LLC Hedge fund	−267K −61.6%	166K	$138,171
D. E. Shaw & Co., Inc. Hedge fund	−126K −6.0%	2.0M	$1.6M
Alliancebernstein L.P. Active manager	−123K Sold out	0	—
Panagora Asset Management Inc Active manager	−115K Sold out	0	—
Algert Global LLC Hedge fund	−62K Sold out	0	—
Irenic Capital Management LP Hedge fund	−58K Sold out	0	—
American Century Companies Inc Active manager	−27K Sold out	0	—
Centiva Capital, LP Hedge fund	−25K Sold out	0	—
Arrowstreet Capital, Limited Partnership Hedge fund	−25K −5.8%	404K	$335,787

New positions

largest by value

Institution	Shares	Value June 30, 2026
Kennedy Capital Management LLCActive manager	1.7M	$1.4M
Corient Private Wealth LP	454K	$377,633
Sei Investments Co	182K	$150,837
Jain Global LLCHedge fund	49K	$40,525
Blair William & Co	40K	$33,419
Balyasny Asset Management L.P.Hedge fund	38K	$31,983
Cerity Partners LLC	19K	$16,140
Captrust Financial Advisors	16K	$13,131
Oversea-Chinese Banking Corp Ltd	15K	$12,845
Schonfeld Strategic Advisors LLCHedge fund	15K	$12,402

Sold out

largest by value

Institution	Shares	Value March 31, 2026
Alliancebernstein L.P.Active manager	123K	$354,129
Clark Estates Inc	240K	$294,745
Cambria Investment Management, L.P.	117K	$144,151
Panagora Asset Management IncActive manager	115K	$140,933
Deutsche Bank Ag\	90K	$111,026
Hillsdale Investment Management Inc.	75K	$92,619
Nuveen, LLC	68K	$83,157
Algert Global LLCHedge fund	62K	$75,962
Irenic Capital Management LPHedge fund	58K	$71,448
Jefferies Financial Group Inc.	50K	$61,500

Who holds the shares

13F holdings at June 30, 2026

Institutions reporting: 99
Ten largest holders: 90.9%
Index fund managers: 5.4%
Active managers and hedge funds: 9.6%

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	13	13	4	8	+1.8M	+27.7%
Index fund managers	0	10	0	0	−3.5M	−43.0%
Other institutions	40	46	15	26	−395K	−0.5%

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 Definitive Healthcare.

Only managers that filed a holdings report for both quarters are compared (132 here). 4 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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