Kiniksa Pharmaceuticals International, plc (KNSA) Institutional Ownership

Institutions by Trading Activity

Ownership Statistics

80,152,174Shares Outstanding

380,776Shares held by institutions

$17,279,615Value of institutional holdings

63.06%Institutional ownership %

27.11%Shares Changed QoQ

212No. of institutional investors

Shares Owned by Institutions

Shares Purchased/Sold by Institutions

Ownership Summary

A total of 212 institutions have reported a stake in Kiniksa Pharmaceuticals International, plc (NASDAQ:KNSA) as of December 2025, according to recent 13F filings with the SEC.

The percentage of Kiniksa Pharmaceuticals International owned by institutions changed from 51.6% in September 2025 to 63.1% in December 2025, marking a slight up trend.
On a quarter-over-quarter basis, institutional holdings shifted by 27.11%, with a year-over-year an increase of 34.18% in the count of filers.
Among the 212 institutional holders of Kiniksa Pharmaceuticals International, 112 added to their stakes while 70 trimmed their positions and 30 held steady.
This class of investors increased its holdings in Kiniksa Pharmaceuticals International to 50.54Mn shares for the 13F-cycle ending December 2025, up by 10.78Mn shares quarter on quarter, and up 11.62Mn shares year over year.
With 7.15Mn shares, Rockefeller Capital Management L.P. commands the largest institutional position in Kiniksa Pharmaceuticals International as of December 31, 2025, equating to 8.93% of the company.
Among the most significant buyers of Kiniksa Pharmaceuticals International during December 2025 were Rockefeller Capital Management L.P. (6.98Mn), Caption Management, LLC (897.90K), FMR LLC (843.11K), VICTORY CAPITAL MANAGEMENT INC (512.16K), Soleus Capital Management, L.P. (437.00K).
Leading sellers of Kiniksa Pharmaceuticals International stock in December 2025 included Rubric Capital Management LP (671.35K), Fairmount Funds Management LLC (453.15K), BRAIDWELL LP (329.36K), Walleye Capital LLC (269.79K), BANK OF AMERICA CORP /DE/ (266.12K).
The top 10 institutional holders of Kiniksa Pharmaceuticals International for the quarter ending December 2025 included Rockefeller Capital Management L.P. (7.15Mn), Rubric Capital Management LP (3.33Mn), VANGUARD GROUP INC (3.11Mn), BAKER BROS. ADVISORS LP (2.83Mn), TANG CAPITAL MANAGEMENT LLC (2.26Mn), ACADIAN ASSET MANAGEMENT LLC (1.71Mn), FMR LLC (1.64Mn), Caption Management, LLC (1.49Mn), MORGAN STANLEY (1.36Mn), Fairmount Funds Management LLC (1.32Mn).

212 Institutional Holders

380,776 Total Shares Held

Rows:

Download Data

Owner Name	Date	Shares Held	Change (QoQ)	Change (%)	Value (USD)
Rockefeller Capital Management L.P.	31 Dec, 2025	7,154,317	6,980,879	4,025.00%	$7,154,318.00
Rubric Capital Management LP	31 Dec, 2025	3,328,653	-671,347	-16.78%	$137,306,936.00
VANGUARD GROUP INC	31 Dec, 2025	3,112,937	49,802	1.63%	$128,408,651.00
BAKER BROS. ADVISORS LP	31 Dec, 2025	2,826,246	1,577	0.06%	$116,582,648.00
TANG CAPITAL MANAGEMENT LLC	31 Dec, 2025	2,259,889	-68,720	-2.95%	$93,220,421.00
ACADIAN ASSET MANAGEMENT LLC	31 Dec, 2025	1,713,043	94,522	5.84%	$70,633.00
FMR LLC	31 Dec, 2025	1,642,863	843,108	105.42%	$67,768,109.00
Caption Management, LLC	31 Dec, 2025	1,490,500	897,900	151.52%	$61,483,125.00
MORGAN STANLEY	31 Dec, 2025	1,360,044	-2,879	-0.21%	$56,101,817.00
Fairmount Funds Management LLC	31 Dec, 2025	1,319,688	-453,151	-25.56%	$54,437,130.00
D. E. Shaw & Co., Inc.	31 Dec, 2025	1,241,621	107,435	9.47%	$51,216,867.00
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP	31 Dec, 2025	1,068,216	-47	0.00%	$44,063,910.00
BNP PARIBAS FINANCIAL MARKETS	31 Dec, 2025	831,777	178,366	27.30%	$34,310,801.00
GOLDMAN SACHS GROUP INC	31 Dec, 2025	829,417	282,907	51.77%	$34,213,451.00
MILLENNIUM MANAGEMENT LLC	31 Dec, 2025	825,285	-188,840	-18.62%	$34,043,006.00
Point72 Asset Management, L.P.	31 Dec, 2025	797,137	230,210	40.61%	$32,881,901.00
Pictet Asset Management Holding SA	31 Dec, 2025	787,520	-144,576	-15.51%	$32,485,200.00
Qube Research & Technologies Ltd	31 Dec, 2025	766,291	76,403	11.07%	$31,609,504.00
CITADEL ADVISORS LLC	31 Dec, 2025	742,118	427,562	135.93%	$30,612,368.00
Connor, Clark & Lunn Investment Management Ltd.	31 Dec, 2025	739,326	13,971	1.93%	$30,497,198.00

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