KNSA · Kiniksa Pharmaceuticals International, plc · Holdings
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 Ownership Trend
Superinvestors Holding KNSA
All superinvestors →Holder Concentration
Across 269 13F filersWho 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% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 18.1% | 31 | +99.6% |
| Systematic-like | 6.1% | 22 | -45.5% |
| Concentrated | 13.1% | 36 | +3.8% |
| Diversified active | 62.6% | 177 | -1.7% |
| Not measured | 0.0% | 0 | — |
| Unknown | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 48.9% | 146 | +25.7% |
| Medium turnover | 32.9% | 69 | -4.7% |
| High turnover | 7.6% | 34 | -44.1% |
| Unknown | 10.5% | 17 | +10.4% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 11.7% | 31 | +14.8% |
| Medium horizon | 9.4% | 44 | +64.6% |
| Long horizon | 56.2% | 172 | -1.2% |
| Unknown | 22.7% | 19 | -4.9% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 3.9% | 45 | +11.3% |
| $1B to $10B | 12.6% | 70 | -5.9% |
| $10B to $100B | 27.0% | 88 | -9.0% |
| $100B or more | 56.4% | 63 | +12.8% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 1.5% | 59 | -3.5% |
| Pooled investment vehicles | 24.9% | 27 | -5.7% |
| Registered funds and BDCs | 13.6% | 18 | +17.3% |
| Pension and profit sharing plans | 0.0% | 2 | +10.0% |
| Insurance companies | 0.1% | 3 | new |
| Governments and sovereign funds | 1.7% | 7 | +6.5% |
| Other investment advisers | 0.0% | 3 | +204.6% |
| Diversified | 8.2% | 17 | -3.2% |
| Other | 0.0% | 0 | — |
| Unknown | 50.0% | 130 | +6.3% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 29.2% | 40 | -11.4% |
| Private equity funds | 1.2% | 5 | +2.4% |
| Venture capital funds | 0.0% | 1 | -9.8% |
| Real estate funds | 0.0% | 3 | +281.8% |
| Securitized asset funds | 0.0% | 1 | -93.7% |
| Other private funds | 4.7% | 14 | +34.5% |
| Mixed private funds | 1.2% | 1 | -7.1% |
| Private funds, type not stated | 0.9% | 1 | -11.8% |
| No private funds | 13.4% | 72 | +13.6% |
| Unknown | 49.4% | 128 | +10.1% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 92.9% | 222 | +6.4% |
| Outside the US | 7.1% | 43 | -24.8% |
| Unknown | 0.1% | 1 | new |
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, 2026Measured 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.
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 basisEstimated, 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 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, 2026Found 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 | Largest peers |
|---|---|---|---|
| 1 | Frazier Life Sciences Management, L.P. Registered adviser, Concentrated | $1,558,942,243 5 held | MIRM, ARQT, TRVI |
| 2 | Avoro Capital Advisors LLC Registered adviser, Concentrated | $1,422,459,621 2 held | KRYS, XENE |
| 3 | WELLINGTON MANAGEMENT GROUP LLP Holding company, Diversified active | $1,276,472,702 18 held | DNTH, MIRM, ALKS |
| 4 | Polar Capital Holdings Plc Registered adviser, Diversified active | $1,250,230,595 9 held | ELVN, XENE, ARQT |
| 5 | RA CAPITAL MANAGEMENT, L.P. Registered adviser, Concentrated | $848,529,115 4 held | SION, EWTX, MIRM |
| 6 | Paradigm Biocapital Advisors LP Registered adviser, Concentrated | $756,038,206 2 held | EWTX, SYRE |
| 7 | PERCEPTIVE ADVISORS LLC Registered adviser, Diversified active | $710,467,659 7 held | SYRE, EWTX, IMVT |
| 8 | Capital World Investors Adviser, Diversified active | $704,778,251 5 held | KRYS, SYRE, MIRM |
| 9 | RTW INVESTMENTS, LP Registered adviser, Diversified active | $699,972,055 6 held | SYRE, IMVT, ALKS |
| 10 | T. Rowe Price Investment Management, Inc. Adviser, Diversified active | $684,380,274 6 held | DNTH, XENE, IMVT |
Fund Ownership of KNSA by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index 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.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega FMR LLC Holding company | $445,818,534 | 14.69% | 6,971,361 | Shares | 2026-08-13 | |
| Large Rubric Capital Management LP Registered adviser | $255,787,210 | 8.43% | 3,999,800 | Shares | 2026-08-14 | |
| Large BAKER BROS. ADVISORS LP Registered adviser | $181,275,419 | 5.97% | 2,834,643 | Shares | 2026-08-14 | |
| Mega BlackRock, Inc. Holding company | $175,198,373 | 5.77% | 2,739,615 | Shares | 2026-08-07 | |
| Mid TANG CAPITAL MANAGEMENT LLC | $144,519,901 | 4.76% | 2,259,889 | Shares | 2026-08-14 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $122,229,873 | 4.03% | 1,911,335 | Shares | 2026-08-13 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $87,025,718 | 2.87% | 1,360,840 | Shares | 2026-08-13 | |
| Mega MORGAN STANLEY Holding company | $64,662,591 | 2.13% | 1,011,143 | Shares | 2026-08-13 | |
| Mega ARROWSTREET CAPITAL, LIMITED PARTNERSHIP Registered adviser | $61,233,020 | 2.02% | 957,514 | Shares | 2026-08-13 | |
| Small Spruce Street Capital LP Registered adviser | $58,710,576 | 1.94% | 918,070 | Shares | 2026-08-13 | |
| Mega DIMENSIONAL FUND ADVISORS LP Registered adviser | $55,942,563 | 1.84% | 874,786 | Shares | 2026-08-11 | |
| Mega Invesco Ltd. Adviser | $49,420,939 | 1.63% | 772,806 | Shares | 2026-08-14 | |
| Large Driehaus Capital Management LLC Registered adviser | $45,928,826 | 1.51% | 718,199 | Shares | 2026-08-14 | |
| Mega STATE STREET CORP Bank | $45,033,206 | 1.48% | 704,194 | Shares | 2026-09-22 | |
| Large ACADIAN ASSET MANAGEMENT LLC | $43,427,357 | 1.43% | 679,083 | Shares | 2026-08-13 | |
| Large Point72 Asset Management, L.P. Registered adviser | $42,174,577 | 1.39% | 659,493 | Shares | 2026-08-14 | |
| Mid RICE HALL JAMES & ASSOCIATES, LLC Registered adviser | $39,964,145 | 1.32% | 624,928 | Shares | 2026-08-07 | |
| Mega Pictet Asset Management Holding SA | $38,923,167 | 1.28% | 608,650 | Shares | 2026-07-30 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $38,637,310 | 1.27% | 604,180 | Shares | 2026-08-12 | |
| Mega Jupiter Topco LLC | $37,486,019 | 1.24% | 586,177 | Shares | 2026-08-14 | |
| Large Connor, Clark & Lunn Investment Management Ltd. Registered adviser | $36,617,642 | 1.21% | 572,598 | Shares | 2026-08-13 | |
| Mega D. E. Shaw & Co., Inc. | $36,435,896 | 1.20% | 569,756 | Shares | 2026-08-14 | |
| Mega TWO SIGMA INVESTMENTS, LP Registered adviser | $35,906,646 | 1.18% | 561,480 | Shares | 2026-08-14 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $35,565,856 | 1.17% | 556,151 | Shares | 2026-08-14 | |
| Mega VICTORY CAPITAL MANAGEMENT INC Registered adviser | $32,285,348 | 1.06% | 504,853 | Shares | 2026-08-07 | |
| Mega SG Americas Securities, LLC | $32,230,863 | 1.06% | 504,001 | Shares | 2026-08-07 | |
| Mega BNP PARIBAS ARBITRAGE, SA Non-US | $27,958,428 | 0.92% | 437,192 | Shares | 2026-08-13 | |
| Mega MASSACHUSETTS FINANCIAL SERVICES CO /MA/ Registered adviser | $27,583,169 | 0.91% | 431,324 | Shares | 2026-08-03 | |
| Mid ORBIMED ADVISORS LLC Registered adviser | $26,897,370 | 0.89% | 420,600 | Shares | 2026-08-14 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $26,437,630 | 0.87% | 413,411 | Shares | 2026-08-14 | |
| Mid OBERWEIS ASSET MANAGEMENT INC/ Registered adviser | $26,413,524 | 0.87% | 413,034 | Shares | 2026-08-14 | |
| Large Aberdeen Group plc Holding company | $25,802,865 | 0.85% | 403,485 | Shares | 2026-07-31 | |
| Mega Fisher Asset Management, LLC Adviser | $25,469,110 | 0.84% | 398,266 | Shares | 2026-08-04 | |
| Mega DEUTSCHE BANK AG\ Non-US | $24,787,402 | 0.82% | 387,606 | Shares | 2026-08-07 | |
| Mega AQR CAPITAL MANAGEMENT LLC Registered adviser | $23,983,741 | 0.79% | 375,039 | Shares | 2026-08-14 | |
| Mid Penn Capital Management Company, LLC Registered adviser | $23,540,890 | 0.78% | 368,114 | Shares | 2026-07-30 | |
| Mega NORTHERN TRUST CORP Bank | $20,159,980 | 0.66% | 315,246 | Shares | 2026-08-13 | |
| Large Balyasny Asset Management L.P. Registered adviser | $19,804,163 | 0.65% | 309,682 | Shares | 2026-08-14 | |
| Mega Qube Research & Technologies Ltd Exempt adviser | $19,445,916 | 0.64% | 304,080 | Shares | 2026-08-14 | |
| Large Caption Management, LLC Registered adviser | $19,172,210 | 0.63% | 299,800 | Put | 2026-08-14 | |
| Large NEW YORK STATE COMMON RETIREMENT FUND | $17,431,427 | 0.57% | 272,579 | Shares | 2026-07-29 | |
| Large NOMURA HOLDINGS INC | $17,312,799 | 0.57% | 270,724 | Shares | 2026-08-14 | |
| Mid Soleus Capital Management, L.P. | $15,754,274 | 0.52% | 246,353 | Shares | 2026-08-11 | |
| Small ESSEX INVESTMENT MANAGEMENT CO LLC Registered adviser | $15,072,786 | 0.50% | 202,021 | Shares | 2026-10-19 | |
| Mega Bank of New York Mellon Corp Bank | $14,870,353 | 0.49% | 232,531 | Shares | 2026-08-06 | |
| Mid ArrowMark Colorado Holdings LLC Registered adviser | $13,784,166 | 0.45% | 215,546 | Shares | 2026-08-13 | |
| Small STEMPOINT CAPITAL LP Registered adviser | $13,380,514 | 0.44% | 209,234 | Shares | 2026-08-14 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $12,237,727 | 0.40% | 191,364 | Shares | 2026-08-14 | |
| Mega SEI INVESTMENTS CO | $12,058,731 | 0.40% | 188,565 | Shares | 2026-08-14 | |
| Mid BRAIDWELL LP Registered adviser | $11,755,416 | 0.39% | 183,822 | Shares | 2026-08-14 | |
| Mid CASTLEARK MANAGEMENT LLC Registered adviser | $11,129,346 | 0.37% | 174,032 | Shares | 2026-08-14 | |
| Large Rockefeller Capital Management L.P. Registered adviser | $11,091,360 | 0.37% | 173,438 | Shares | 2026-08-13 | |
| Mid PEREGRINE CAPITAL MANAGEMENT LLC Registered adviser | $10,325,622 | 0.34% | 161,464 | Shares | 2026-07-17 | |
| Mid Granahan Investment Management, LLC Registered adviser | $9,702,813 | 0.32% | 151,725 | Shares | 2026-08-14 | |
| Large Squarepoint Ops LLC Registered adviser | $8,956,773 | 0.30% | 140,059 | Shares | 2026-08-14 | |
| Mega Nuveen, LLC | $8,137,955 | 0.27% | 127,255 | Shares | 2026-08-11 | |
| Large SILVERCREST ASSET MANAGEMENT GROUP LLC Registered adviser | $6,993,508 | 0.23% | 109,359 | Shares | 2026-08-14 | |
| Mega NORDEA INVESTMENT MANAGEMENT AB Non-US | $6,852,689 | 0.23% | 107,157 | Shares | 2026-08-05 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC Registered adviser | $6,495,721 | 0.21% | 101,575 | Shares | 2026-08-14 | |
| Large Universal- Beteiligungs- und Servicegesellschaft mbH | $6,385,535 | 0.21% | 99,852 | Shares | 2026-08-06 | |
| Small GLOBEFLEX CAPITAL L P Registered adviser | $5,972,674 | 0.20% | 93,396 | Shares | 2026-08-12 | |
| Mega MILLENNIUM MANAGEMENT LLC Registered adviser | $5,970,627 | 0.20% | 93,364 | Shares | 2026-08-14 | |
| Small Lisanti Capital Growth, LLC | $5,583,154 | 0.18% | 87,305 | Shares | 2026-08-10 | |
| Mid Legato Capital Management LLC Registered adviser | $5,582,643 | 0.18% | 87,297 | Shares | 2026-08-06 | |
| Mega Swiss National Bank | $4,713,115 | 0.16% | 73,700 | Shares | 2026-08-11 | |
| Mega VANGUARD FIDUCIARY TRUST CO | $4,626,846 | 0.15% | 72,351 | Shares | 2026-08-13 | |
| Mid SEGALL BRYANT & HAMILL, LLC Registered adviser | $4,598,068 | 0.15% | 71,901 | Shares | 2026-08-12 | |
| Large RENAISSANCE TECHNOLOGIES LLC Registered adviser | $4,353,524 | 0.14% | 68,077 | Shares | 2026-08-13 | |
| Mega MANUFACTURERS LIFE INSURANCE COMPANY, THE | $4,330,374 | 0.14% | 67,715 | Shares | 2026-09-09 | |
| Large LAZARD ASSET MANAGEMENT LLC Adviser | $4,303,259 | 0.14% | 67,291 | Shares | 2026-08-14 | |
| Large Allspring Global Investments Holdings, LLC Holding company | $4,162,953 | 0.14% | 65,097 | Shares | 2026-08-13 | |
| Mid Linden Thomas Advisory Services, LLC Registered adviser | $4,058,858 | 0.13% | 54,401 | Shares | 2026-10-19 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $3,742,929 | 0.12% | 58,529 | Shares | 2026-08-12 | |
| Mega AMERICAN CENTURY COMPANIES INC | $3,607,291 | 0.12% | 56,408 | Shares | 2026-08-12 | |
| Mid Informed Momentum Co LLC Registered adviser | $3,566,171 | 0.12% | 55,765 | Shares | 2026-08-13 | |
| Large Trexquant Investment LP Registered adviser | $3,421,772 | 0.11% | 53,507 | Shares | 2026-08-14 | |
| Large HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND Non-US | $3,370,165 | 0.11% | 52,700 | Shares | 2026-08-13 | |
| Large TRUIST FINANCIAL CORP Bank | $3,304,360 | 0.11% | 51,671 | Shares | 2026-07-28 | |
| Large LOS ANGELES CAPITAL MANAGEMENT LLC Registered adviser | $3,247,764 | 0.11% | 50,786 | Shares | 2026-08-13 | |
| Mega JANE STREET GROUP, LLC | $3,127,155 | 0.10% | 48,900 | Call | 2026-08-14 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $3,112,892 | 0.10% | 48,677 | Shares | 2026-08-14 | |
| Mid Sowell Financial Services LLC Registered adviser | $3,039,238 | 0.10% | 40,735 | Shares | 2026-10-20 | |
| Mega UBS Group AG Bank | $2,888,876 | 0.10% | 45,174 | Shares | 2026-08-13 | |
| Mega CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Benefit plan | $2,721,648 | 0.09% | 42,559 | Shares | 2026-08-24 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $2,664,476 | 0.09% | 41,665 | Shares | 2026-09-02 | |
| Mid Aquatic Capital Management LLC Registered adviser | $2,655,715 | 0.09% | 41,528 | Shares | 2026-08-14 | |
| Large MUTUAL OF AMERICA CAPITAL MANAGEMENT LLC Registered adviser | $2,654,180 | 0.09% | 41,504 | Shares | 2026-08-11 | |
| Mid PDT Partners, LLC Registered adviser | $2,594,259 | 0.09% | 40,567 | Shares | 2026-08-14 | |
| Large Man Group plc | $2,591,509 | 0.09% | 40,524 | Shares | 2026-08-14 | |
| Mega CITIGROUP INC Bank | $2,590,805 | 0.09% | 40,513 | Shares | 2026-08-03 | |
| Large Cerity Partners LLC Registered adviser | $2,589,207 | 0.09% | 40,488 | Shares | 2026-08-14 | |
| Small Timothy G. Youngquist 2020 Irrevocable Trust | $2,562,182 | 0.08% | 34,341 | Shares | 2026-10-13 | |
| Mega RAYMOND JAMES FINANCIAL INC | $2,439,563 | 0.08% | 38,148 | Shares | 2026-08-14 | |
| Mega Legal & General Group Plc | $2,273,357 | 0.07% | 35,549 | Shares | 2026-08-14 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $2,227,378 | 0.07% | 34,830 | Shares | 2026-08-14 | |
| Large ExodusPoint Capital Management, LP Registered adviser | $2,111,437 | 0.07% | 33,017 | Shares | 2026-08-14 | |
| Mid Voleon Capital Management LP Registered adviser | $2,097,943 | 0.07% | 32,806 | Shares | 2026-08-14 | |
| Mega AMERIPRISE FINANCIAL INC Adviser | $2,082,915 | 0.07% | 32,571 | Shares | 2026-08-14 | |
| Mega LPL Financial LLC Broker-dealer | $2,073,259 | 0.07% | 32,420 | Shares | 2026-08-07 | |
| Mega JPMORGAN CHASE & CO Bank | $2,017,811 | 0.07% | 31,553 | Shares | 2026-08-12 |
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