Adaptive Biotechnologies (ADPT) CCO sells 5,000 shares under 10b5-1 plan

Rhea-AI Filing Summary

Adaptive Biotechnologies Corp Chief Commercial Officer for MRD, Susan Bobulsky, reported an open-market sale of 5,000 shares of Common Stock at $20.50 per share. After this transaction, she directly holds 406,775 shares. The sale was carried out under a pre-arranged Rule 10b5-1 trading plan adopted on December 16, 2025, indicating it was scheduled in advance.

Insider Trade Summary 10b5-1

Net Seller: 5,000 shares ($102,500)

Net Sell 1 txn

Insider BOBULSKY SUSAN

Role Chief Commercial Officer, MRD

Sold 5,000 shs ($103K)

Type	Security	Shares	Price	Value
Sale	Common Stock	5,000	$20.50	$103K

Holdings After Transaction: Common Stock — 406,775 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Shares sold: 5,000 shares Sale price: $20.50 per share Shares held after transaction: 406,775 shares +2 more

5 metrics

Shares sold 5,000 shares Open-market sale on June 25, 2026

Sale price $20.50 per share Common Stock transaction

Shares held after transaction 406,775 shares Direct ownership following sale

Transaction type Open-market sale (Code S) Non-derivative Common Stock

Trading plan adoption date December 16, 2025 Rule 10b5-1 trading plan

Key Terms

Rule 10b5-1 trading plan, open-market sale, Common Stock, Form 4

4 terms

Rule 10b5-1 trading plan regulatory

"The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan..."

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

open-market sale financial

"transaction_action: open-market sale"

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Common Stock financial

"security_title: Common Stock"

Common stock represents ownership shares in a company, giving investors a stake in its success and a say in important decisions through voting rights. It is the most common type of stock traded on markets and can provide income through dividends, as well as potential for value growth. For investors, holding common stock means sharing in the company’s profits and risks.

Form 4 regulatory

"The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan..."

Form 4 is a official document that company insiders, such as executives or major shareholders, file with regulators whenever they buy or sell company shares. It provides transparency about how those with inside knowledge are trading, helping investors see if insiders are confident in the company's prospects or may be selling for personal reasons. This information can influence investor decisions by revealing insiders' perspectives on the company's value.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 06/29/2026 - 07:53 PM Accepted by SEC EDGAR 06/29/2026 - 07:52 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a 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). See Instruction 10.

1. Name and Address of Reporting Person^*

BOBULSKY SUSAN

(Last) (First) (Middle)

C/O ADAPTIVE BIOTECHNOLOGIES CORPORATION

1165 EASTLAKE AVENUE EAST

(Street)

SEATTLE WASHINGTON 98109

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Adaptive Biotechnologies Corp [ ADPT ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Commercial Officer, MRD

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/25/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	06/25/2026		S(1)		5,000	D	$20.5	406,775	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The transactions reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 16, 2025.

	Susan Bobulsky by Kyle Piskel, Attorney-in-Fact	06/29/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did Adaptive Biotechnologies (ADPT) report?

Adaptive Biotechnologies reported that Chief Commercial Officer Susan Bobulsky sold 5,000 shares of Common Stock. The shares were sold in an open-market transaction at $20.50 per share under a pre-arranged Rule 10b5-1 trading plan.

How many Adaptive Biotechnologies (ADPT) shares did the executive sell and at what price?

Susan Bobulsky sold 5,000 shares of Adaptive Biotechnologies Common Stock at $20.50 per share. This was an open-market transaction and was executed pursuant to a previously adopted Rule 10b5-1 trading plan.

How many Adaptive Biotechnologies (ADPT) shares does Susan Bobulsky hold after the sale?

Following the reported sale, Susan Bobulsky directly holds 406,775 shares of Adaptive Biotechnologies Common Stock. This figure reflects her position after disposing of 5,000 shares in the open market at $20.50 per share.

Was the Adaptive Biotechnologies (ADPT) insider sale made under a Rule 10b5-1 plan?

Yes. The filing states the transactions were effected under a Rule 10b5-1 trading plan adopted on December 16, 2025. Such plans schedule trades in advance, helping separate routine portfolio management from discretionary market-timing decisions.

Who is the insider involved in the latest Adaptive Biotechnologies (ADPT) Form 4?

The insider is Susan Bobulsky, Chief Commercial Officer, MRD, at Adaptive Biotechnologies. She reported selling 5,000 shares of Common Stock at $20.50 per share and now directly owns 406,775 shares after the transaction.