Adaptive Biotechnologies Corp (ADPT)
Who owns Adaptive Biotechnologies Corp (ADPT)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 78.5% of the shares are freely tradable; institutional investors hold 96.3%.
Ownership Structure
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Viking Global Investors LP | 4.71 | 29,993,708 | +0.0 | 03/31/2026 |
| BlackRock Inc | 2.09 | 13,303,025 | -0.2 | 03/31/2026 |
| Vanguard Capital Management, LLC | 0.96 | 6,094,144 | +0.0 | 03/31/2026 |
| Westfield Capital Management Company, L.P. | 0.85 | 5,436,718 | +33.9 | 03/31/2026 |
| Vanguard Portfolio Management, LLC | 0.71 | 4,491,474 | +0.0 | 03/31/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| iShares Russell 2000 ETF | 2.49 | 3,968,453 | +1.1 | 07/28/2026 |
| ARK Genomic Revolution ETF | 1.11 | 1,772,557 | +0.1 | 07/29/2026 |
| iShares Russell 2000 Growth ETF | 0.89 | 1,409,171 | +0.0 | 07/28/2026 |
| Vanguard Morn Total Stk Mkt Idx Investor | 0.76 | 4,835,465 | +4.2 | 06/30/2026 |
| iShares Biotechnology ETF | 0.71 | 1,133,639 | -0.1 | 07/28/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 21. Jul 2026 | Robins Harlan S | Chief Scientific Officer | Sell | 213,702 | 22.12 | 4,727,088 |
| 21. Jul 2026 | Robins Harlan S | Chief Scientific Officer | Sell | 278,698 | 21.72 | 6,053,321 |
| 21. Jul 2026 | Robins Harlan S | Chief Scientific Officer | Other | 284,800 | 6.55 | 1,865,440 |
| 16. Jul 2026 | Bobulsky Susan | Chief Commercial Officer, MRD | Sell | 5,000 | 23.00 | 115,000 |
| 15. Jul 2026 | Lo Francis | Chief People Officer | Sell | 105,762 | 22.59 | 2,389,164 |
| 15. Jul 2026 | Lo Francis | Chief People Officer | Other | 22,711 | 8.46 | 192,135 |
| 15. Jul 2026 | Lo Francis | Chief People Officer | Other | 23,677 | 12.14 | 287,439 |
| 15. Jul 2026 | Lo Francis | Chief People Officer | Other | 59,374 | 7.80 | 463,117 |
| 24. Apr 2026 | Julie Rubinstein | COO | Sell | 19,060 | 14.02 | 267,221 |
| 22. Apr 2026 | Julie Rubinstein | COO | Sell | 19,060 | 14.13 | 269,318 |
| 21. Apr 2026 | Julie Rubinstein | COO | Sell | 30,941 | 14.66 | 453,595 |
| 20. Apr 2026 | Julie Rubinstein | COO | Sell | 19,060 | 14.55 | 277,323 |
Reportable transactions by officers and major shareholders from SEC Form 4 filings. "Other" includes things like stock grants and option exercises without a buy/sell character.
View all insider transactions →Data as of: August 3, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.