Adaptive Biotech director plans $748K stock resale

Adaptive Biotechnologies Corporation (ADPT) director Robert M. Hershberg filed a notice of proposed resale under Rule 144.

Rhea-AI Filing Summary

Adaptive Biotechnologies Corporation (ADPT) director Robert M. Hershberg filed a notice of proposed resale under Rule 144. The filing covers up to 30,664 shares of common stock to be sold through Morgan Stanley Smith Barney, with an aggregate market value of $748,303.36. The calculation references 159,595,842 shares outstanding as of August 18, 2026, and includes shares from stock option exercises and restricted stock.

Key Figures

Shares proposed for resale: 30,664 shares Aggregate market value: $748,303.36 Shares outstanding: 159,595,842 shares +2 more

5 metrics

Shares proposed for resale 30,664 shares Common stock covered by the Rule 144 notice

Aggregate market value $748,303.36 Value of 30,664 shares proposed for resale

Shares outstanding 159,595,842 shares ADPT common shares outstanding as of August 18, 2026

Stock option shares 15,000 shares Shares underlying stock option exercise dated August 18, 2026

Restricted stock shares 15,664 shares Restricted stock dated March 4, 2025 included in resale amount

Key Terms

Rule 144, Restricted Stock, Stock Option Exercise, aggregate market value

4 terms

Rule 144 regulatory

"filed a notice of proposed resale under Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock financial

"Common | 03/04/2025 | Restricted Stock | Issuer"

Shares granted to an individual that carry limits on transfer or sale until certain conditions are met, such as staying with the company for a set time or hitting performance targets. Think of them as a locked gift that gradually opens; for investors they matter because they affect how many shares may enter the market later, signal management incentives and potential dilution, and reveal confidence in future company performance.

Stock Option Exercise financial

"Common | 08/18/2026 | Stock Option Exercise | Issuer"

A stock option exercise is the act of using a previously granted right to buy shares of a company's stock at a specific, predetermined price by paying that price and receiving the shares. It matters to investors because exercising changes who owns the shares (which can dilute existing ownership), can trigger taxable events and shift potential gains or losses, and affects voting power and the company’s outstanding share count—like turning a voucher into an actual product that becomes part of circulating supply.

aggregate market value financial

"30664 | 748303.36 | 159595842 | 08/18/2026"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing mean for Adaptive Biotechnologies (ADPT)?

The filing indicates director Robert M. Hershberg plans a potential resale of up to 30,664 shares of ADPT common stock under Rule 144. It is a notice of proposed sales and does not itself execute transactions.

How many Adaptive Biotechnologies (ADPT) shares are covered by this Form 144?

The Form 144 covers up to 30,664 shares of ADPT common stock. These shares come from a 15,000-share stock option exercise and 15,664 restricted shares, together forming the maximum amount proposed for resale.

What is the aggregate market value of the ADPT shares in this Form 144?

The proposed resale covers an aggregate market value of $748,303.36 of ADPT common stock. This value is based on the 30,664 shares covered by the notice and reflects pricing used solely for this Rule 144 filing.

How many Adaptive Biotechnologies (ADPT) shares were outstanding for this Form 144?

The filing references 159,595,842 shares of ADPT common stock outstanding as of August 18, 2026. This figure is used in the Form 144 disclosure as context for the proposed resale amount.

What types of ADPT equity are involved in Robert Hershberg’s Form 144?

The notice includes shares from a stock option exercise of 15,000 shares dated August 18, 2026, and 15,664 restricted stock shares dated March 4, 2025. Together they comprise the 30,664 shares proposed for resale.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 08/18/2026 - 06:18 PM Accepted by SEC EDGAR 08/18/2026 - 06:17 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001274139
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	ADAPTIVE BIOTECHNOLOGIES CORPORATION
SEC File Number	001-38957
Address of Issuer	1165 Eastlake Avenue East Seattle WASHINGTON 98109
Phone	(206) 659-0067
Name of Person for Whose Account the Securities are To Be Sold	ROBERT M HERSHBERG
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Director

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	30664	748303.36	159595842	08/18/2026	NASDAQ

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	08/18/2026	Stock Option Exercise	Issuer			15000	08/18/2026	Cash
Common	03/04/2025	Restricted Stock	Issuer			15664	03/04/2025	Not Applicable

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	08/18/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ Robert Hershberg
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)