Francis Lo - 22 Dec 2025 Form 4/A - Amendment Insider Report for Adaptive Biotechnologies Corp (ADPT)

Role
Chief People Officer
Signature
/s/ Francis Lo by Kyle Piskel, Attorney-in-Fact
Issuer symbol
ADPT
Transactions as of
22 Dec 2025
Net transactions value
-$50,255
Form type
4/A - Amendment
Filing time
07 Jan 2026, 20:52:30 UTC
Date Of Original Report
29 Dec 2025
Previous filing
17 Dec 2025
Next filing
06 Jan 2026
SEC
View on sec.gov

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
LO FRANCIS Chief People Officer C/O ADAPTIVE BIOTECHNOLOGIES CORPORATION, 1165 EASTLAKE AVE E, SEATTLE /s/ Francis Lo by Kyle Piskel, Attorney-in-Fact 07 Jan 2026 0001780660

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction ADPT Common Stock Options Exercise $8,580 +1,100 +0.35% $7.80 317,078 22 Dec 2025 Direct F1
transaction ADPT Common Stock Options Exercise $9,306 +1,100 +0.35% $8.46 318,178 22 Dec 2025 Direct F1
transaction ADPT Common Stock Options Exercise $8,754 +2,194 +0.69% $3.99 320,372 22 Dec 2025 Direct F1
transaction ADPT Common Stock Sale $76,895 -4,394 -1.4% $17.50 315,978 22 Dec 2025 Direct F1, F2
holding ADPT Common Stock 2,500 22 Dec 2025 By You Jin Lee (spouse)

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 $0 -1,100 -0.97% $0.000000 112,150 22 Dec 2025 Common Stock 1,100 $7.80 Direct F1, F3
transaction ADPT Stock Option (right to buy) Options Exercise $0 -1,100 -1% $0.000000 108,076 22 Dec 2025 Common Stock 1,100 $8.46 Direct F1, F4
transaction ADPT Stock Option (right to buy) Options Exercise $0 -2,194 -2% $0.000000 107,981 22 Dec 2025 Common Stock 2,194 $3.99 Direct F1, F5
* 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 The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on September 15, 2025.
F2 The price reported for this transaction is a weighted -average price. The shares were sold in multiple transactions ranging from $17.49 to $17.50, 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.
F3 The option is fully vested and exercisable.
F4 The options vested with respect to 1/4 of such shares on March 4, 2024, with 1/48 of such shares vesting thereafter at the end of each full month of continuous service until fully vested.
F5 The options vested with respect to 1/4 of such shares on March 4, 2025, with 1/48 of such shares vesting thereafter at the end of each full month of continuous service until fully vested.