ADPT
Adaptive Biotechnologies Corp
26.60$
-5.4%
vs. previous close
Closing price · As of: Oct 30, 2026
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%.
Institutional ownership
?Share of the stock held by institutional investors (funds, banks, insurers) according to regulatory filings.
96.3%
Insiders
?Share of the stock held by the executives, founders and major shareholders of the company itself.
1.8%
Float
?Share of stock freely tradable on the market — not locked up in the hands of founders, insiders, or major shareholders.
78.6%
Short % of float
?Shares sold short as a percentage of the freely tradable float — high values signal many bets on falling prices.
9.5%
Shares Outstanding
?Total number of shares issued. Price times share count gives market cap.
160Mio.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Viking Global Investors LP | 18.79 | 29,993,708 | +0.0 | 06/30/2026 |
| BlackRock Inc | 9.49 | 15,139,159 | +13.8 | 06/30/2026 |
| Vanguard Capital Management, LLC | 4.01 | 6,403,587 | +5.1 | 06/30/2026 |
| Wellington Management Company LLP | 3.70 | 5,911,366 | +53.2 | 06/30/2026 |
| Vanguard Portfolio Management, LLC | 3.43 | 5,476,231 | +21.9 | 06/30/2026 |
| D. E. Shaw & Co LP | 2.90 | 4,625,859 | +135.3 | 06/30/2026 |
| Westfield Capital Management Company, L.P. | 2.67 | 4,267,645 | -21.5 | 06/30/2026 |
| Geode Capital Management, LLC | 2.28 | 3,641,837 | +0.2 | 06/30/2026 |
Funds
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Vanguard MStar Total Stk Mkt Idx Invest | 3.05 | 4,862,285 | +0.3 | 09/30/2026 |
| iShares Russell 2000 ETF | 2.58 | 4,122,023 | -1.1 | 09/30/2026 |
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 | 58,001,779 $ | Aug 18, 2026 | direct |
| Robins Harlan S | Chief Scientific Officer | 812,058 | 21,600,743 $ | Jul 21, 2026 | direct |
| Bobulsky Susan | Chief Commercial Officer, MRD | 389,350 | 10,356,710 $ | Oct 6, 2026 | direct |
| Rubinstein Julie | President and COO | 377,802 | 10,049,533 $ | Oct 29, 2026 | direct |
| Lo Francis | Chief People Officer | 220,867 | 5,875,062 $ | Oct 1, 2026 | direct |
| Neupert Peter M | Director | 130,625 | 3,474,625 $ | Aug 17, 2026 | direct |
| Owen Katey Einterz | Director | 66,100 | 1,758,260 $ | Aug 31, 2026 | direct |
| Hershberg Robert | Director | 46,683 | 1,241,768 $ | 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 |
|---|---|---|---|---|---|---|
| Oct 29, 2026 | Rubinstein Julie | President and COO | Sell | 11,881 | 28.27 | 335,876 |
| Oct 29, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 28, 2026 | Rubinstein Julie | President and COO | Sell | 200 | 28.90 | 5,780 |
| Oct 28, 2026 | Rubinstein Julie | President and COO | Sell | 11,681 | 28.44 | 332,208 |
| Oct 28, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 27, 2026 | Rubinstein Julie | President and COO | Sell | 8,881 | 27.53 | 244,494 |
| Oct 27, 2026 | Rubinstein Julie | President and COO | Sell | 3,000 | 26.58 | 79,740 |
| Oct 27, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 26, 2026 | Rubinstein Julie | President and COO | Sell | 3,378 | 26.30 | 88,841 |
| Oct 26, 2026 | Rubinstein Julie | President and COO | Sell | 8,503 | 25.94 | 220,568 |
| Oct 26, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 23, 2026 | Rubinstein Julie | President and COO | Sell | 7,381 | 25.28 | 186,592 |
| Oct 23, 2026 | Rubinstein Julie | President and COO | Sell | 4,500 | 24.50 | 110,250 |
| Oct 23, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 22, 2026 | Rubinstein Julie | President and COO | Sell | 1,700 | 25.29 | 42,993 |
| Oct 22, 2026 | Rubinstein Julie | President and COO | Sell | 10,181 | 24.38 | 248,213 |
| Oct 22, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 21, 2026 | Rubinstein Julie | President and COO | Sell | 5,882 | 25.57 | 150,403 |
| Oct 21, 2026 | Rubinstein Julie | President and COO | Sell | 5,999 | 25.25 | 151,475 |
| Oct 21, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 20, 2026 | Rubinstein Julie | President and COO | Sell | 100 | 24.85 | 2,485 |
| Oct 20, 2026 | Rubinstein Julie | President and COO | Sell | 11,781 | 24.53 | 288,988 |
| Oct 20, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 19, 2026 | Rubinstein Julie | President and COO | Sell | 11,881 | 24.05 | 285,738 |
| Oct 19, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 16, 2026 | Rubinstein Julie | President and COO | Sell | 300 | 25.45 | 7,635 |
| Oct 16, 2026 | Rubinstein Julie | President and COO | Sell | 11,581 | 24.21 | 280,376 |
| Oct 16, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 15, 2026 | Rubinstein Julie | President and COO | Sell | 11,881 | 25.61 | 304,272 |
| Oct 15, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 14, 2026 | Rubinstein Julie | President and COO | Sell | 5,100 | 25.82 | 131,682 |
| Oct 14, 2026 | Rubinstein Julie | President and COO | Sell | 6,781 | 25.57 | 173,390 |
| Oct 14, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 13, 2026 | Rubinstein Julie | President and COO | Sell | 11,881 | 25.50 | 302,966 |
| Oct 13, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 12, 2026 | Rubinstein Julie | President and COO | Sell | 2,700 | 26.07 | 70,389 |
| Oct 12, 2026 | Rubinstein Julie | President and COO | Sell | 9,181 | 25.35 | 232,738 |
| Oct 12, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 9, 2026 | Rubinstein Julie | President and COO | Sell | 11,881 | 26.41 | 313,777 |
| Oct 9, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 8, 2026 | Rubinstein Julie | President and COO | Sell | 11,881 | 25.66 | 304,866 |
| Oct 8, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 7, 2026 | Rubinstein Julie | President and COO | Sell | 11,881 | 26.40 | 313,658 |
| Oct 7, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
| Oct 6, 2026 | Bobulsky Susan | Chief Commercial Officer, MRD | Sell | 6,444 | 30.00 | 193,320 |
| Oct 6, 2026 | Rubinstein Julie | President and COO | Sell | 499 | 30.53 | 15,234 |
| Oct 6, 2026 | Rubinstein Julie | President and COO | Sell | 901 | 29.71 | 26,769 |
| Oct 6, 2026 | Rubinstein Julie | President and COO | Sell | 1,100 | 28.21 | 31,031 |
| Oct 6, 2026 | Rubinstein Julie | President and COO | Sell | 9,381 | 27.36 | 256,664 |
| Oct 6, 2026 | Rubinstein Julie | President and COO | Other | 11,881 | 12.14 | 144,235 |
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: October 30, 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.