Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
222 institutional managers reported holding KNSA for the quarter ended Mar 31, 2026. Together they hold about 55% of shares outstanding; the top 10 hold 29%. 37 opened new positions; 37 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| FMR (Fidelity) | 6.82M | 8.28% | $329.5M | added +315.4% | 2020 Q1 |
| Rubric Capital Management LP | 3.75M | 4.55% | $181.1M | added +12.7% | 2022 Q3 |
| Vanguard Group | 3.16M | 3.84% | $152.8M | added +1.6% | 2018 Q2 |
| Baker Bros. Advisors LP | 2.83M | 3.43% | $136.5M | unchanged | 2018 Q2 |
| Tang Capital Management LLC | 2.26M | 2.74% | $109.1M | unchanged | 2022 Q1 |
| Acadian Asset Management | 1.34M | 1.62% | $64.5M | trimmed -22% | 2022 Q4 |
| Morgan Stanley | 997.8k | 1.21% | $48.2M | trimmed -26.6% | 2018 Q2 |
| D. E. Shaw | 959.3k | 1.16% | $46.3M | trimmed -22.7% | 2021 Q4 |
| Arrowstreet Capital | 892.7k | 1.08% | $43.1M | trimmed -16.4% | 2023 Q3 |
| Dimensional Fund Advisors | 811.9k | 0.98% | $39.2M | added +18.8% | 2019 Q4 |
| Spruce Street Capital LP (focused) | 761.1k | 0.92% | $36.8M | added +75% | 2025 Q4 |
| Bank OF America CORP /DE/ | 735.9k | 0.89% | $35.5M | added +220.9% | 2018 Q3 |
| Qube Research & Technologies LTD | 686.9k | 0.83% | $33.2M | trimmed -10.4% | 2023 Q1 |
| Connor, Clark & Lunn Investment Management LTD. | 649.6k | 0.79% | $31.4M | trimmed -12.1% | 2022 Q4 |
| BNP Paribas Financial Markets | 647.7k | 0.79% | $31.3M | trimmed -22.1% | 2018 Q3 |
| Point72 | 641.0k | 0.78% | $31.0M | trimmed -19.6% | 2025 Q1 |
| SG Americas Securities, LLC | 640.2k | 0.78% | $30.9M | added +18.2% | 2023 Q4 |
| Pictet Asset Management Holding SA | 623.3k | 0.76% | $30.1M | trimmed -20.9% | 2020 Q4 |
| Driehaus Capital Management LLC | 611.4k | 0.74% | $29.5M | trimmed -3.4% | 2023 Q3 |
| Rice Hall James & Associates, LLC | 608.4k | 0.74% | $29.4M | added +2% | 2020 Q4 |
| AllianceBernstein | 598.9k | 0.73% | $28.9M | added +82.4% | 2025 Q4 |
| Millennium Management | 564.4k | 0.69% | $27.3M | trimmed -31.6% | 2019 Q4 |
| Deutsche Bank AG\ | 523.7k | 0.64% | $25.3M | trimmed -16.9% | 2018 Q3 |
| Soleus Capital Management, L.p. | 521.4k | 0.63% | $25.2M | trimmed -11.2% | 2024 Q2 |
| Victory Capital Management INC | 506.5k | 0.61% | $24.5M | trimmed -1.1% | 2023 Q3 |
| Balyasny Asset Management | 499.8k | 0.61% | $24.1M | opened | 2026 Q1 |
| BlackRock | 486.7k | 0.59% | $23.5M | added +9% | 2018 Q2 |
| Janus Henderson | 481.0k | 0.58% | $23.2M | added +213.5% | 2023 Q1 |
| Citadel Advisors | 474.8k | 0.58% | $22.9M | trimmed -36% | 2018 Q2 |
| MFS Investment Management | 438.0k | 0.53% | $21.2M | added +3% | 2023 Q1 |
| Fisher Investments | 429.0k | 0.52% | $20.7M | added +60.5% | 2024 Q2 |
| Two Sigma | 420.9k | 0.51% | $20.3M | trimmed -20.7% | 2025 Q2 |
| Susquehanna International Group | 383.8k | 0.47% | $18.5M | added +272.6% | 2022 Q4 |
| AQR Capital | 378.7k | 0.46% | $18.3M | added +7.3% | 2022 Q4 |
| Aberdeen Group plc | 373.6k | 0.45% | $18.0M | trimmed -6.7% | 2025 Q3 |
| Nomura Asset Management International INC. | 342.9k | 0.42% | $16.6M | trimmed -16.9% | 2025 Q3 |
| Oberweis Asset Management INC/ | 318.6k | 0.39% | $15.4M | added +1.9% | 2024 Q3 |
| ArrowMark Colorado Holdings LLC | 317.0k | 0.39% | $15.3M | trimmed -5% | 2018 Q2 |
| Marshall Wace | 305.4k | 0.37% | $14.7M | added +5165% | 2024 Q3 |
| Penn Capital Management Company, LLC | 302.0k | 0.37% | $14.6M | opened | 2026 Q1 |
| SEI Investments CO | 284.0k | 0.34% | $13.7M | added +30.6% | 2023 Q3 |
| Braidwell LP | 272.5k | 0.33% | $13.2M | trimmed -13.2% | 2024 Q1 |
| Parkman Healthcare Partners LLC | 259.2k | 0.32% | $12.5M | trimmed -61% | 2021 Q4 |
| Essex Investment Management CO LLC | 249.3k | 0.30% | $12.0M | trimmed -0.7% | 2023 Q1 |
| NEW York State Common Retirement Fund | 209.6k | 0.25% | $10.1M | opened | 2026 Q1 |
| Granahan Investment Management, LLC | 209.3k | 0.25% | $10.1M | trimmed -33.8% | 2021 Q3 |
| Castleark Management LLC | 181.5k | 0.22% | $8.8M | trimmed -5.6% | 2025 Q3 |
| Peregrine Capital Management LLC | 181.4k | 0.22% | $8.8M | trimmed -14% | 2024 Q1 |
| Orbimed Advisors LLC | 180.6k | 0.22% | $8.7M | trimmed -3.5% | 2025 Q4 |
| Goldman Sachs | 174.9k | 0.21% | $8.4M | trimmed -78.9% | 2019 Q1 |
Largest 50 of 222 shown; the full ranked, searchable register is at boothcheck.com/holders/KNSA. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.