Adaptive Biotechnologies Corp
Ownership
Ownership Structure
Who owns Adaptive Biotechnologies Corp (ADPT)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 78.6% of the shares are freely tradable; institutional investors hold 96.3%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Viking Global Investors LP | 4.70 | 29,993,708 | +0.0 | 03/31/2026 |
| BlackRock Inc | 2.08 | 13,303,025 | -0.2 | 03/31/2026 |
| Vanguard Capital Management, LLC | 0.95 | 6,094,144 | +0.0 | 03/31/2026 |
| Wellington Management Company LLP | 0.93 | 5,911,366 | +53.2 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.04 | 4,853,021 | +0.4 | 07/31/2026 |
| iShares Russell 2000 ETF | 2.46 | 3,919,440 | -0.6 | 08/31/2026 |
| ARK Genomic Revolution ETF | 1.18 | 1,880,308 | -0.3 | 08/31/2026 |
| Vanguard Small Cap Index | 1.10 | 1,749,558 | +0.2 | 07/31/2026 |
| iShares Russell 2000 Growth ETF | 0.90 | 1,440,196 | +0.0 | 08/31/2026 |
| Vanguard Institutional Extnd Mkt Idx Tr | 0.89 | 1,422,453 | +0.5 | 07/31/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Insider holdings
| Person | Role | Shares | Value | As of | Type |
|---|---|---|---|---|---|
| Robins Chad M | CEO and Chairman | 2,180,518 | 62,362,815 $ | Aug 18, 2026 | direct |
| Robins Harlan S | Chief Scientific Officer | 812,058 | 23,224,859 $ | Jul 21, 2026 | direct |
| Bobulsky Susan | Chief Commercial Officer, MRD | 396,989 | 11,353,885 $ | Aug 10, 2026 | direct |
| Lo Francis | Chief People Officer | 230,713 | 6,598,392 $ | Jul 15, 2026 | direct |
| Neupert Peter M | Director | 130,625 | 3,735,875 $ | Aug 17, 2026 | direct |
| Owen Katey Einterz | Director | 66,100 | 1,890,460 $ | Aug 31, 2026 | direct |
| Hershberg Robert | Director | 46,683 | 1,335,134 $ | Aug 18, 2026 | direct |
Holdings as of each person's most recent SEC Form 4 filing — excluding options and RSUs, which are not shares yet. Holdings may have changed between two filings.
Insiders
Insider Transactions
| Date | Person | Role | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| Aug 31, 2026 | Owen Katey Einterz | Director | Other | 12,539 | – | – |
| Aug 26, 2026 | Owen Katey Einterz | Director | Sell | 9,615 | 26.00 | 249,990 |
| Aug 18, 2026 | Hershberg Robert | Director | Sell | 15,664 | 24.41 | 382,358 |
| Aug 18, 2026 | Hershberg Robert | Director | Sell | 15,000 | 24.39 | 365,850 |
| Aug 18, 2026 | Hershberg Robert | Director | Other | 15,000 | 6.32 | 94,800 |
| Aug 18, 2026 | Robins Chad M | CEO and Chairman | Sell | 204 | 25.14 | 5,129 |
| Aug 18, 2026 | Robins Chad M | CEO and Chairman | Sell | 278,472 | 24.48 | 6,816,995 |
| Aug 18, 2026 | Robins Chad M | CEO and Chairman | Other | 278,676 | 6.55 | 1,825,328 |
| Aug 17, 2026 | Robins Chad M | CEO and Chairman | Sell | 2,525 | 25.57 | 64,564 |
| Aug 17, 2026 | Robins Chad M | CEO and Chairman | Sell | 318,799 | 25.08 | 7,995,479 |
| Aug 17, 2026 | Robins Chad M | CEO and Chairman | Other | 321,324 | 6.55 | 2,104,672 |
| Aug 17, 2026 | Neupert Peter M | Director | Sell | 69,690 | 25.16 | 1,753,400 |
| Aug 17, 2026 | Neupert Peter M | Director | Sell | 40,000 | 25.10 | 1,004,000 |
| Aug 17, 2026 | Neupert Peter M | Director | Sell | 15,000 | 25.23 | 378,450 |
| Aug 17, 2026 | Neupert Peter M | Director | Other | 15,000 | 6.32 | 94,800 |
| Aug 10, 2026 | Bobulsky Susan | Chief Commercial Officer, MRD | Sell | 3,000 | 25.00 | 75,000 |
| Jul 30, 2026 | Bobulsky Susan | Chief Commercial Officer, MRD | Sell | 1,299 | 24.00 | 31,176 |
| Jul 21, 2026 | Robins Harlan S | Chief Scientific Officer | Sell | 213,702 | 22.12 | 4,727,088 |
| Jul 21, 2026 | Robins Harlan S | Chief Scientific Officer | Sell | 278,698 | 21.72 | 6,053,321 |
| Jul 21, 2026 | Robins Harlan S | Chief Scientific Officer | Other | 284,800 | 6.55 | 1,865,440 |
| Jul 16, 2026 | Bobulsky Susan | Chief Commercial Officer, MRD | Sell | 5,000 | 23.00 | 115,000 |
| Jul 15, 2026 | Lo Francis | Chief People Officer | Sell | 105,762 | 22.59 | 2,389,164 |
| Jul 15, 2026 | Lo Francis | Chief People Officer | Other | 22,711 | 8.46 | 192,135 |
| Jul 15, 2026 | Lo Francis | Chief People Officer | Other | 23,677 | 12.14 | 287,439 |
| Jul 15, 2026 | Lo Francis | Chief People Officer | Other | 59,374 | 7.80 | 463,117 |
| Apr 24, 2026 | Julie Rubinstein | COO | Sell | 19,060 | 14.02 | 267,221 |
| Apr 22, 2026 | Julie Rubinstein | COO | Sell | 19,060 | 14.13 | 269,318 |
| Apr 21, 2026 | Julie Rubinstein | COO | Sell | 30,941 | 14.66 | 453,595 |
| Apr 20, 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: September 17, 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.