| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Rubric Capital Management LP | 9.2% | +15% | $108,181,595 | +$14,569,740 | 3,909,806 | +16% | RUBRIC CAPITAL MANAGEMENT LP | 30 Jun 2025 |
| VANGUARD GROUP INC | 7% | $118,941,532 | 3,063,135 | The Vanguard Group | 30 Sep 2025 | |||
| TANG CAPITAL MANAGEMENT LLC | 5.2% | $46,556,874 | 2,178,609 | TANG CAPITAL MANAGEMENT, LLC | 28 Mar 2025 | |||
| BlackRock, Inc. | 1% | -88% | $11,570,238 | -$51,021,128 | 418,151 | -82% | BlackRock, Inc. | 30 Jun 2025 |
As of 30 Sep 2025, 199 institutional investors reported holding 40,800,729 shares of Kiniksa Pharmaceuticals International, plc - Common Stock (KNSA). This represents 94% of the company’s total 43,510,440 outstanding shares.
The largest institutional shareholders of Kiniksa Pharmaceuticals International, plc - Common Stock (KNSA) together control 68% of the company’s outstanding shares — a level of ownership often associated with strong institutional conviction and long‑term capital commitment.
| Institution | Ownership % | Shares Held | Share Change % | Portfolio % | Holdings Value |
|---|---|---|---|---|---|
| Rubric Capital Management LP | 9.2% | 4,000,000 | +2.3% | 2.1% | $155,320,000 |
| VANGUARD GROUP INC | 7% | 3,063,135 | -2.2% | 0% | $118,941,532 |
| BAKER BROS. ADVISORS LP | 6.5% | 2,824,669 | 0% | 0.79% | $109,681,897 |
| TANG CAPITAL MANAGEMENT LLC | 5.4% | 2,328,609 | 0% | 3.5% | $90,419,887 |
| Fairmount Funds Management LLC | 4.1% | 1,772,839 | 0% | 6.2% | $68,839,338 |
| ACADIAN ASSET MANAGEMENT LLC | 3.7% | 1,618,521 | +28% | 0.11% | $62,824,000 |
| MORGAN STANLEY | 3.1% | 1,362,922 | +28% | 0% | $52,922,261 |
| D. E. Shaw & Co., Inc. | 2.6% | 1,134,186 | +43% | 0.04% | $44,040,443 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 2.5% | 1,068,263 | +45% | 0.03% | $41,480,652 |
| MILLENNIUM MANAGEMENT LLC | 2.3% | 1,014,125 | -0.57% | 0.03% | $39,378,474 |
| Pictet Asset Management Holding SA | 2.1% | 932,096 | -5.3% | 0.03% | $36,193,288 |
| FMR LLC | 1.8% | 799,755 | -0.89% | 0% | $31,054,496 |
| Connor, Clark & Lunn Investment Management Ltd. | 1.7% | 725,355 | +16% | 0.09% | $28,165,535 |
| Qube Research & Technologies Ltd | 1.6% | 689,888 | -22% | 0.04% | $26,788,351 |
| Parkman Healthcare Partners LLC | 1.5% | 671,592 | +37% | 2.9% | $26,077,917 |
| Driehaus Capital Management LLC | 1.5% | 654,585 | +1% | 0.18% | $25,417,536 |
| BNP PARIBAS FINANCIAL MARKETS | 1.5% | 653,411 | 0% | 0.02% | $25,371,949 |
| BRAIDWELL LP | 1.5% | 643,180 | -42% | 0.74% | $24,974,679 |
| DIMENSIONAL FUND ADVISORS LP | 1.5% | 632,123 | -2.5% | 0.01% | $24,545,132 |
| RICE HALL JAMES & ASSOCIATES, LLC | 1.3% | 577,822 | -9.5% | 1.2% | $22,436,828 |
| Point72 Asset Management, L.P. | 1.3% | 566,927 | -33% | 0.05% | $22,013,743 |
| GOLDMAN SACHS GROUP INC | 1.3% | 546,510 | +42% | 0% | $21,220,983 |
| DEUTSCHE BANK AG\ | 1.2% | 533,375 | +44% | 0.01% | $20,710,951 |
| BANK OF AMERICA CORP /DE/ | 1.1% | 495,483 | +82% | 0% | $19,239,604 |
| TWO SIGMA INVESTMENTS, LP | 1.1% | 461,770 | +182% | 0.03% | $17,930,529 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 1,757,788 | $72,506,096 | +$22,441,913 | $41.25 | 21 |
| 2025 Q3 | 40,800,729 | $1,584,103,697 | +$42,759,189 | $38.83 | 199 |
| 2025 Q2 | 39,765,765 | $1,100,293,484 | +$3,474,538 | $27.67 | 186 |
| 2025 Q1 | 39,936,950 | $887,052,494 | +$25,344,007 | $22.21 | 173 |
| 2024 Q4 | 38,910,834 | $769,756,202 | -$20,642,445 | $19.78 | 156 |
| 2024 Q3 | 39,503,444 | $987,347,556 | +$124,891,730 | $24.99 | 172 |
| 2024 Q2 | 35,248,812 | $658,014,093 | +$655,780,340 | $18.67 | 126 |