Aktis Oncology, Inc. AKTS
CIK 0002035832 · CUSIP 01021M104
Quarter-end disclosures, not live holdings.
Top 20 institutions
Weight means this stock's share of the manager's own portfolio.
| # | Manager | Value | Manager weight | Change vs prior | Source | |
|---|---|---|---|---|---|---|
| 01 | MPM BIOIMPACT LLC CIK 1687078 · View history | $86.51M 4,835,872 shares | 6.68% | +4.84MNew | SEC filing ↗ May 15, 2026 | ▾ |
| 02 | EcoR1 Capital, LLC CIK 1587114 · View history | $86.31M 4,824,469 shares | 3.69% | +4.82MNew | SEC filing ↗ May 15, 2026 | ▾ |
| 03 | Blue Owl Capital Holdings LP CIK 1858703 · View history | $56.56M 3,161,348 shares | 15.20% | +3.16MNew | SEC filing ↗ May 14, 2026 | ▾ |
| 04 | WELLINGTON MANAGEMENT GROUP LLP CIK 902219 · View history | $41.45M 2,317,044 shares | 0.01% | +2.32MNew | SEC filing ↗ May 15, 2026 | ▾ |
| 05 | T. Rowe Price Investment Management, Inc. CIK 1897612 · View history | $37.99M 2,123,812 shares | 0.03% | +2.12MNew | SEC filing ↗ May 15, 2026 | ▾ |
| 06 | BlackRock, Inc. CIK 2012383 · View history | $37.79M 2,112,127 shares | 0.00% | +2.11MNew | SEC filing ↗ May 13, 2026 | ▾ |
| 07 | RTW INVESTMENTS, LP CIK 1493215 · View history | $28.48M 1,592,043 shares | 0.28% | +1.59MNew | SEC filing ↗ May 15, 2026 | ▾ |
| 08 | PRICE T ROWE ASSOCIATES INC /MD/ CIK 80255 · View history | $27.98M 1,564,196 shares | 0.00% | +1.56MNew | SEC filing ↗ May 15, 2026 | ▾ |
| 09 | RA CAPITAL MANAGEMENT, L.P. CIK 1346824 · View history | $26.89M 1,503,084 shares | 0.28% | +1.50MNew | SEC filing ↗ May 15, 2026 | ▾ |
| 10 | JANUS HENDERSON GROUP PLC CIK 1274173 · Amended · View history | $26.02M 1,454,267 shares | 0.01% | +1.45MNew | SEC filing ↗ May 18, 2026 | ▾ |
| 11 | BAKER BROS. ADVISORS LP CIK 1263508 · View history | $17.82M 996,351 shares | 0.10% | +996.35KNew | SEC filing ↗ May 15, 2026 | ▾ |
| 12 | Octagon Capital Advisors LP CIK 1839435 · View history | $17.19M 960,847 shares | 1.90% | +960.85KNew | SEC filing ↗ May 15, 2026 | ▾ |
| 13 | Merck & Co., Inc. CIK 310158 · View history | $17.05M 952,844 shares | 4.88% | +952.84KNew | SEC filing ↗ May 13, 2026 | ▾ |
| 14 | VANGUARD CAPITAL MANAGEMENT LLC CIK 2100119 · Amended · View history | $14.92M 833,913 shares | 0.00% | — | SEC filing ↗ May 15, 2026 | ▾ |
| 15 | EVENTIDE ASSET MANAGEMENT, LLC CIK 1442891 · View history | $9.07M 507,000 shares | 0.15% | +507.00KNew | SEC filing ↗ May 15, 2026 | ▾ |
| 16 | GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history | $8.80M 491,936 shares | 0.00% | +491.94KNew | SEC filing ↗ May 15, 2026 | ▾ |
| 17 | Avidity Partners Management LP CIK 1791827 · Amended · View history | $8.38M 468,566 shares | 1.70% | +468.57KNew | SEC filing ↗ May 28, 2026 | ▾ |
| 18 | STATE STREET CORP CIK 93751 · View history | $7.66M 428,253 shares | 0.00% | +428.25KNew | SEC filing ↗ May 15, 2026 | ▾ |
| 19 | a16z Capital Management, L.L.C. CIK 1540358 · View history | $7.42M 415,000 shares | 0.58% | +415.00KNew | SEC filing ↗ May 15, 2026 | ▾ |
| 20 | FMR LLC CIK 315066 · View history | $6.91M 386,379 shares | 0.00% | +386.38KNew | SEC filing ↗ May 15, 2026 | ▾ |
Showing 20 / 69 institutions. The complete set is available through the API.
Coverage & totals by quarter
Reporting institutions by quarter
Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.
Explore all 69 reporting institutions.
This page includes 20 of 69 reporting institutions. Sign in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.
- Download CSV
- Earlier quarters
- Advanced screening & filtering
- API & AI access
+ New accounts get free API credits to explore data beyond ownership filings.
For AI agents & developers
The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. This page lists 20 of 69 reporting institutions; totals use the complete disclosed data.
Without an account: the last 3 years, with the row caps stated on the page. A free account opens all history on file on these pages and the CSV of what a page shows. Rows beyond the caps and bulk retrieval go through the authenticated API / MCP.
MCP https://api.akkrudata.ai/mcp
get_institutional_security_holders
{"cusip":"01021M104","quarter":"2026Q1","type":"positions","page_size":100}Connect to MCP with OAuth and follow the returned pagination. Credits and usage limits depend on the account.
- MCP endpoint
- https://api.akkrudata.ai/mcp
- API / MCP documentation
- /documents
- llms.txt
- /llms.txt
Sources, coverage & how to read this data
Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.