| Filer | Ownership | Change % | Holdings Value | Net Change | Nb Shares | Change % | Reporting Name | Report Period |
|---|---|---|---|---|---|---|---|---|
| Rubric Capital Management LP | 7.4% | -21% | $139,836,713 | -$24,414,238 | 3,328,653 | -15% | Rubric Capital Management LP | 31 Dec 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 31 Dec 2025, 146 institutional investors reported holding 23,129,852 shares of Kiniksa Pharmaceuticals International, plc - Class A Ordinary Shares, nominal value $0.000273235 per share (KNSA). This represents 51% of the company’s total 45,164,898 outstanding shares.
The largest institutional shareholders of Kiniksa Pharmaceuticals International, plc - Class A Ordinary Shares, nominal value $0.000273235 per share (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 | 7.4% | 3,328,653 | -17% | 1.6% | $137,306,936 |
| VANGUARD GROUP INC | 6.9% | 3,112,937 | +1.6% | 0% | $128,408,651 |
| BAKER BROS. ADVISORS LP | 6.3% | 2,826,246 | +0.06% | 0.68% | $116,582,648 |
| TANG CAPITAL MANAGEMENT LLC | 5% | 2,259,889 | -3% | 4.6% | $93,220,421 |
| ACADIAN ASSET MANAGEMENT LLC | 3.8% | 1,713,043 | +5.8% | 0.12% | $70,633,000 |
| FMR LLC | 3.6% | 1,642,863 | +105% | 0% | $67,768,109 |
| MORGAN STANLEY | 3% | 1,360,044 | -0.21% | 0% | $56,101,817 |
| Fairmount Funds Management LLC | 2.9% | 1,319,688 | -26% | 4.1% | $54,437,130 |
| D. E. Shaw & Co., Inc. | 2.7% | 1,241,621 | +9.5% | 0.04% | $51,216,867 |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | 2.4% | 1,068,216 | -0% | 0.03% | $44,063,910 |
| BNP PARIBAS FINANCIAL MARKETS | 1.8% | 831,777 | 0% | 0.02% | $34,310,801 |
| GOLDMAN SACHS GROUP INC | 1.8% | 829,417 | +52% | 0% | $34,213,451 |
| MILLENNIUM MANAGEMENT LLC | 1.8% | 825,285 | -19% | 0.02% | $34,043,006 |
| Point72 Asset Management, L.P. | 1.8% | 797,137 | +41% | 0.05% | $32,881,901 |
| Pictet Asset Management Holding SA | 1.7% | 787,520 | -16% | 0.03% | $32,485,200 |
| Qube Research & Technologies Ltd | 1.7% | 766,291 | +11% | 0.05% | $31,609,504 |
| CITADEL ADVISORS LLC | 1.6% | 742,118 | +136% | 0.02% | $30,612,368 |
| Connor, Clark & Lunn Investment Management Ltd. | 1.6% | 739,326 | +1.9% | 0.08% | $30,497,198 |
| DIMENSIONAL FUND ADVISORS LP | 1.5% | 683,505 | +8.1% | 0.01% | $28,193,698 |
| Parkman Healthcare Partners LLC | 1.5% | 665,208 | -0.95% | 2.6% | $27,439,830 |
| Driehaus Capital Management LLC | 1.4% | 632,827 | -3.3% | 0.18% | $26,104,114 |
| DEUTSCHE BANK AG\ | 1.4% | 630,291 | +18% | 0.01% | $25,999,504 |
| RICE HALL JAMES & ASSOCIATES, LLC | 1.3% | 596,431 | +3.2% | 1.4% | $24,602,779 |
| Soleus Capital Management, L.P. | 1.3% | 587,000 | +291% | 1% | $24,213,750 |
| SG Americas Securities, LLC | 1.2% | 541,396 | +289% | 0.03% | $22,333,000 |
| Period | Reported Shares, Excl. Options | Value, Excl. Options | Value Change | Price (Median) | Investors |
|---|---|---|---|---|---|
| 2025 Q4 | 23,129,852 | $953,968,429 | +$31,741,192 | $41.25 | 146 |
| 2025 Q3 | 40,800,790 | $1,584,106,066 | +$42,759,189 | $38.83 | 200 |
| 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 |