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KNSA · Kiniksa Pharmaceuticals International, plc · Holdings

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$83.17 +3.69 (+4.64%) At close · Oct 20
Market Cap
$12.98B
Shares
156.05M
Volume · Oct 20 1.24M Avg daily vol (3M) 597.53K

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Institutional holdings are being reconciled with SEC filings. Holder totals and changes may be incomplete until reconciliation finishes.
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 277
Total Value: $3,033,990,129
Total Shares: 47,364,348
Showing 1–100 of 283 holdings by value · page 1 of 3

Institutional Ownership Trend

10 quarters

Holder Concentration

Across 269 13F filers
Top Holder
14.7%
Jun 2024 → Jun 2026 · range 7.5% – 14.7%
of institutional value
Top 5
39.7%
Jun 2024 → Jun 2026 · range 29.7% – 45.7%
of institutional value
Top 10
52.7%
Jun 2024 → Jun 2026 · range 45.5% – 67.2%
of institutional value
HHI
459
Jun 2024 → Jun 2026 · range 296 – 576
Broadly held

Who Holds KNSA

Last 8 quarters through Sep 30, 2026 (filing window open)

Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.

Jun 30, 2026, the newest closed quarter: 266 filers, like-for-like change +3.4%; actively managed books -6.5%; index-like books +99.6%.

Holder type Share Filers Change
Registered adviser 50.0% 136 +0.7%
Exempt adviser 0.7% 2 -70.5%
Adviser 2.7% 7 +149.5%
Bank 4.1% 13 +69.3%
Insurer 0.0% 2 new
Broker-dealer 0.1% 1 +54.9%
Benefit plan 0.3% 5 +17.5%
Non-US 2.2% 8 -26.0%
Holding company 24.3% 7 +28.2%
Unknown 15.8% 85 -17.8%

The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.

How the mix is measured

Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.

Excluded 2 holders with no observed 2026-03-31 13F and 4 holders with no observed 2026-06-30 13F. Compared across CIK changes: JANUS HENDERSON GROUP PLC continues as Jupiter Topco LLC.

Conviction and Crowding

266 13F filers, quarter ended Jun 30, 2026

Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.

Conviction holders
5
1.88% of filers hold it in their top 10
Mar 31, 2026: 3
Holders above 5%
2
median weight 0.004%
Mar 31, 2026: 2
Crowding
—
the issuer has more than one class of common stock, so its count is the total across classes
Private-fund advisers
—
of shares outstanding
Institutional ownership
—
the issuer has more than one class of common stock, so its count is the total across classes
Top 10 holders
53.2%
of 13F shares, Herfindahl 0.047
Active holders
-6.5%
like-for-like share change of active filers
5% stakes on record
5
1 13D, 4 13G (3 institutional, 1 passive, 0 exempt)
How long holders have held it value-weighted 7.2 quarters
Under 1 year 18.7% 1 to 3 years 81.3% 3 years or more 0.000% Since coverage start 0.000%

Managers in the top fifth by current three-year FundScore alpha were net buyers of $7,937,114 (1 buying, 1 selling).

Estimated Holder Cost Basis

Quarter ended Jun 30, 2026, on that quarter's share basis

Estimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.

Estimated avg cost
$33.57
estimated per share
Mar 31, 2026: $29.79
Quarter-end price
$63.95
implied by 13F values
Estimated gain or loss
+90.5%
price against the estimated cost
Estimated at a loss
0.000%
of costed 13F value

Estimated cost covers 90.7% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.

Shared Holders

Companies KNSA's active holders also own, quarter ended Jun 30, 2026
# Company Shared holders
1 MIRM Mirum Pharmaceuticals, Inc. 13
2 DNTH Dianthus Therapeutics, Inc. /DE/ 10
3 ARQT Arcutis Biotherapeutics, Inc. 7
4 XENE Xenon Pharmaceuticals Inc. 9
5 SION Sionna Therapeutics, Inc. 6
6 IMVT Immunovant, Inc. 6
7 EWTX Edgewise Therapeutics, Inc. 7
8 AUPH Aurinia Pharmaceuticals Inc. 5
9 ALKS Alkermes plc. 9
10 VCYT Veracyte, Inc. 7

Shareholder Targets

13F filers that own its peers but not KNSA, quarter ended Jun 30, 2026

Found through its holder-overlap peers: MIRM, DNTH, ARQT, XENE, SION, IMVT, EWTX, AUPH, ALKS, VCYT, NPCE, SYRE, KRYS, ANIP, PRLD, ELVN, HNGE, AXGN, TRVI, RAPP. 841 filers in all.

# Filer In peers
1 Frazier Life Sciences Management, L.P. Registered adviser, Concentrated $1,558,942,243 5 held
2 Avoro Capital Advisors LLC Registered adviser, Concentrated $1,422,459,621 2 held
3 WELLINGTON MANAGEMENT GROUP LLP Holding company, Diversified active $1,276,472,702 18 held
4 Polar Capital Holdings Plc Registered adviser, Diversified active $1,250,230,595 9 held
5 RA CAPITAL MANAGEMENT, L.P. Registered adviser, Concentrated $848,529,115 4 held
6 Paradigm Biocapital Advisors LP Registered adviser, Concentrated $756,038,206 2 held
7 PERCEPTIVE ADVISORS LLC Registered adviser, Diversified active $710,467,659 7 held
8 Capital World Investors Adviser, Diversified active $704,778,251 5 held
9 RTW INVESTMENTS, LP Registered adviser, Diversified active $699,972,055 6 held
10 T. Rowe Price Investment Management, Inc. Adviser, Diversified active $684,380,274 6 held

Fund Ownership of KNSA by Fund Type

Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026

Index funds and index ETFs hold 1.97% of shares outstanding.

Fund type Of shares outstanding Shares
Index funds 0.05% 78,029
Index ETFs 1.92% 3,001,852
Active ETFs 0.18% 277,744
Active funds 0.84% 1,307,663
Unclassified 0.03% 44,207
All registered funds 3.02% 4,709,495
How fund types are measured

Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.

Showing 100 of 283
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Holder Value (USD) % of 13F Shares Open

Showing the top 100 of 283 holders. Create a free account to see every holder, past quarters, search, filters and CSV export.

Key facts CIK 1730430 CUSIP G52694109 13F (30d) 30 filings 30 filers Visit website Investor relations