Julie Rubinstein - 11 Mar 2026 Form 4 Insider Report for Adaptive Biotechnologies Corp (ADPT)

Role
President and COO
Signature
/s/ Julie Rubinstein by Kyle Piskel, Attorney-in-Fact
Issuer symbol
ADPT
Transactions as of
11 Mar 2026
Net transactions value
-$2,374,058
Form type
4
Filing time
13 Mar 2026, 21:36:44 UTC
Previous filing
10 Mar 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
RUBINSTEIN JULIE President and COO C/O ADAPTIVE BIOTECHNOLOGIES CORPORATION, 1165 EASTLAKE AVENUE EAST, SEATTLE /s/ Julie Rubinstein by Kyle Piskel, Attorney-in-Fact 13 Mar 2026 0001780664

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ADPT Common Stock Sale $1,613,628 -122,523 -19% $13.17 520,948 11 Mar 2026 Direct F1
transaction ADPT Common Stock Options Exercise +14,722 +2.8% $6.55* 535,670 11 Mar 2026 Direct F2
transaction ADPT Common Stock Sale $268,365 -19,060 -3.6% $14.08 516,610 11 Mar 2026 Direct F2, F3
transaction ADPT Common Stock Options Exercise +14,722 +2.8% $6.55* 531,332 12 Mar 2026 Direct F2
transaction ADPT Common Stock Sale $172,526 -13,660 -2.6% $12.63 517,672 12 Mar 2026 Direct F2, F4
transaction ADPT Common Stock Sale $72,522 -5,400 -1% $13.43 512,272 12 Mar 2026 Direct F2, F5
transaction ADPT Common Stock Options Exercise +14,722 +2.9% $6.55* 526,994 13 Mar 2026 Direct F2
transaction ADPT Common Stock Sale $247,018 -19,060 -3.6% $12.96 507,934 13 Mar 2026 Direct F2, F6

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction ADPT Stock Option (right to buy) Options Exercise -14,722 -14% $0.000000* 92,271 11 Mar 2026 Common Stock 14,722 $6.55 Direct F2, F7
transaction ADPT Stock Option (right to buy) Options Exercise -14,722 -16% $0.000000* 77,549 12 Mar 2026 Common Stock 14,722 $6.55 Direct F2, F7
transaction ADPT Stock Option (right to buy) Options Exercise -14,722 -19% $0.000000* 62,827 13 Mar 2026 Common Stock 14,722 $6.55 Direct F2, F7
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id Content
F1 This transaction represents the number of shares required to be sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of RSUs. This sale is mandated by Issuer's election under the equity incentive plans to require the satisfaction of tax withholding obligations to be funded by a "sell to cover" transaction and does not represent a discretionary trade by the Reporting Person.
F2 The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 18, 2025.
F3 The price reported for this transaction is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.83 to $14.38, inclusive. The reporting person undertakes to provide to Adaptive Biotechnologies Corporation, any security holder of Adaptive Biotechnologies Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in any footnotes to this Form 4.
F4 The price reported for this transaction is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.11 to $13.02, inclusive. The reporting person undertakes to provide to Adaptive Biotechnologies Corporation, any security holder of Adaptive Biotechnologies Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in any footnotes to this Form 4.
F5 The price reported for this transaction is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.12 to $13.76, inclusive. The reporting person undertakes to provide to Adaptive Biotechnologies Corporation, any security holder of Adaptive Biotechnologies Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in any footnotes to this Form 4.
F6 The price reported for this transaction is a weighted average price. These shares were sold in multiple transactions at prices ranging from $12.76 to $13.19, inclusive. The reporting person undertakes to provide to Adaptive Biotechnologies Corporation, any security holder of Adaptive Biotechnologies Corporation, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in any footnotes to this Form 4.
F7 The option is fully vested and exercisable.