Kiniksa Pharmaceuticals Ownership | Who Owns Kiniksa Pharmaceuticals?

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Kiniksa Pharmaceuticals Ownership Summary

Kiniksa Pharmaceuticals is owned by 9.91% institutional investors, 3.53% insiders, and 86.56% retail investors. Rubric capital management lp is the largest institutional shareholder, holding 4.52% of KNSA shares. Vanguard US Total Market Shares ETF is the top mutual fund, with 1.72% of its assets in Kiniksa Pharmaceuticals shares.

KNSA Ownership Benchmark

Type	Name	% Inst	% Insiders	% Retail
Stock	Kiniksa Pharmaceuticals	9.91%	3.53%	86.56%
Sector	Healthcare Stocks	232.64%	10.66%	-143.30%
Industry	Biotech Stocks	382.13%	10.41%	-292.54%

Institutional Shareholders

Top Institutional Shareholders by Total Shares

Holder	Shares	% Holding	Value
Rubric capital management lp	3.33M	4.52%	$137.31M
Vanguard group	3.11M	4.23%	$128.41M
Baker bros. advisors lp	2.82M	3.85%	$109.68M
Tang capital management	2.33M	3.17%	$90.42M
Fairmount funds management	1.77M	2.41%	$68.84M
Acadian asset management	1.71M	2.33%	$70.63M
Morgan stanley	1.36M	1.85%	$56.10M
Arrowstreet capital, limited partnership	1.07M	1.45%	$44.06M
Bnp paribas arbitrage, snc	831.78K	1.13%	$34.31M
Goldman sachs group	829.42K	1.13%	$34.21M

Top Institutional Shareholders by % of Total Assets

Holder	Shares	% Assets	Value
Fairmount funds management	1.77M	6.19%	$68.84M
Lion point capital, lp	23.40K	5.16%	$908.62K
Tang capital management	2.33M	3.48%	$90.42M
Parkman healthcare partners	671.59K	2.72%	$26.08M
Rubric capital management lp	3.33M	1.64%	$137.31M
Essex investment management	247.30K	1.47%	$9.60M
Rice hall james & associates	577.82K	1.22%	$22.44M
Soleus capital management	587.00K	0.89%	$24.21M
Baker bros. advisors lp	2.82M	0.79%	$109.68M
Braidwell lp	643.18K	0.74%	$24.97M

Top Buyers

Holder	Shares	% Assets	Change
Soleus capital management	587.00K	0.89%	437.00K
Sg americas securities	541.40K	0.03%	402.08K
Two sigma investments, lp	461.77K	0.03%	298.03K
Walleye capital	413.09K	0.06%	293.20K
Goldman sachs group	829.42K	0.00%	282.91K

Top Sellers

Holder	Shares	% Assets	Change
Blackrock	-	-	-4.19M
Hhlr advisors	-	-	-1.58M
Nuveen asset management	-	-	-831.10K
Rubric capital management lp	3.33M	1.64%	-671.35K
Braidwell lp	643.18K	0.74%	-459.40K

New Positions

Holder	Shares	% Assets	Change	Value
Rockefeller capital management	173.44K	0.01%	173.44K	$6.73M
Castleark management	158.63K	0.17%	158.63K	$6.16M
Silvercrest asset management group	126.26K	0.03%	126.26K	$4.90M
Voleon capital management lp	89.17K	0.08%	89.17K	$3.46M
Adage capital partners gp	59.00K	0.00%	59.00K	$2.29M

Sold Out

Holder	Change
Twin peaks wealth advisors	-1.00
Riggs asset managment	-30.00
Nelson, van denburg & campbell wealth management group	-34.00
Avion wealth	-43.00
Sterling capital management	-44.00

Institutional Ownership Trends

Date	Holdings	Change %	Shares	Change %	Ownership	Change %	Increased Position	Change %	Decreased Position	Change %
Dec 31, 2025	61	-70.67%	7,296,166	-82.12%	9	0.32%	27	-74.53%	19	-72.86%
Sep 30, 2025	71	-62.83%	6,310,956	-84.11%	8	0.29%	41	-63.06%	20	-67.74%
Jun 30, 2025	190	6.74%	39,714,331	2.46%	54	1.90%	110	15.79%	62	12.73%
Mar 31, 2025	178	9.20%	39,838,056	2.13%	54	1.84%	95	21.79%	55	-5.17%
Dec 31, 2024	1	-50.00%	98,093	-23.09%	-	432.56%	1	-	-	-

Top Mutual Funds Shareholders

Holder	Shares	% Holding	Change
Vanguard US Total Market Shares ETF	1.25M	1.72%	-
Vanguard Total Stock Mkt Idx Inv	1.23M	1.60%	-
Pictet Biotech	965.39K	1.36%	965.39K
iShares Russell 2000 ETF	971.72K	1.33%	-
Vanguard Small Cap Index	920.57K	1.20%	483.00
Vanguard Institutional Extnd Mkt Idx Tr	567.21K	0.80%	795.00
Vanguard Small Cap Growth Index Inv	511.98K	0.67%	-7.60K
Pictet-Biotech P USD	501.59K	0.66%	-1.46K
Fidelity Small Cap Growth	488.85K	0.64%	-
Fidelity Small Cap Index	390.01K	0.53%	-893.00

Recent Insider Transactions

Date	Name	Role	Activity	Value
Mar 09, 2026	Ragosa Mark	CHIEF FINANCIAL OFFICER	Sell	$866.58K
Mar 09, 2026	Ragosa Mark	CHIEF FINANCIAL OFFICER	Sell	$819.57K
Mar 02, 2026	Paolini John F.	CHIEF MEDICAL OFFICER	Sell	$533.18K
Mar 02, 2026	Paolini John F.	CHIEF MEDICAL OFFICER	Sell	$997.37K
Mar 02, 2026	Paolini John F.	CHIEF MEDICAL OFFICER	Sell	$262.39K

Insider Transactions Trends

Date	Buy	Sell
2026 Q1	-	12
2025 Q4	-	17
2025 Q3	-	19
2025 Q2	-	29
2025 Q1	-	8

KNSA Ownership FAQ

Who Owns Kiniksa Pharmaceuticals?

Kiniksa Pharmaceuticals shareholders are primarily institutional investors at 9.91%, followed by 3.53% insiders and 86.56% retail investors. The average institutional ownership in Kiniksa Pharmaceuticals's industry, Biotech Stocks , is 382.13%, which Kiniksa Pharmaceuticals falls below.

Who owns the most shares of Kiniksa Pharmaceuticals?

Kiniksa Pharmaceuticals’s largest shareholders are Rubric capital management lp (3.33M shares, 4.52%), Vanguard group (3.11M shares, 4.23%), and Baker bros. advisors lp (2.82M shares, 3.85%). Together, they hold 12.60% of Kiniksa Pharmaceuticals’s total shares outstanding.

Does Blackrock own Kiniksa Pharmaceuticals?

BlackRock is not among the top 10 institutional shareholders of Kiniksa Pharmaceuticals.

Who is Kiniksa Pharmaceuticals’s biggest shareholder by percentage of total assets invested?

Fairmount funds management is Kiniksa Pharmaceuticals’s biggest shareholder by percentage of total assets invested, with 6.19% of its assets in 1.77M Kiniksa Pharmaceuticals shares, valued at 68.84M$.

Who is the top mutual fund holder of Kiniksa Pharmaceuticals shares?

Vanguard US Total Market Shares ETF is the top mutual fund holder of Kiniksa Pharmaceuticals shares, with 1.72% of its total shares outstanding invested in 1.25M Kiniksa Pharmaceuticals shares.

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