Adaptive Biotechnologies plans $8M stock sale

ADPT reported a planned sale of restricted securities under Rule 144.

Rhea-AI Filing Summary

ADPT reported a planned sale of restricted securities under Rule 144. The planned transaction covers 321,324 shares of common stock to be sold through Goldman Sachs & Co. LLC. The shares have an aggregate market value of $7,959,195.48, based on the filer’s stated valuation.

The shares relate to stock options originally acquired as compensation on February 7, 2018, with the disposition described as a compensation – cashless exercise / same-day sale. At the time of this notice, 159,595,842 shares of the issuer’s common stock were outstanding, providing context for the size of the proposed sale. The proposed sale date is August 17, 2026 on the NASD market.

Key Figures

Shares to be sold: 321,324 shares Aggregate market value: $7,959,195.48 Shares outstanding: 159,595,842 shares +2 more

5 metrics

Shares to be sold 321,324 shares Common stock covered by the Form 144 notice

Aggregate market value $7,959,195.48 Stated aggregate market value of shares to be sold

Shares outstanding 159,595,842 shares Issuer common shares outstanding as referenced in the notice

Proposed sale date 08/17/2026 Proposed date for the sale of the covered shares

Option grant date 02/07/2018 Date stock options were acquired as compensation

Key Terms

Rule 144, cashless exercise, same-day sale, aggregate market value

4 terms

Rule 144 regulatory

"reported a planned sale of restricted securities 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.

cashless exercise financial

"described as a compensation -- cashless exercise / same-day sale"

A cashless exercise is a way for an option holder to convert stock options into actual shares without paying the purchase price in cash; instead they immediately give up a portion of the newly issued shares to cover the cost and any withholding taxes. Investors care because this process increases the number of shares available and can slightly dilute existing holdings, while also signaling how insiders or employees are realizing compensation without needing cash — similar to paying for a purchase by handing over part of what you just bought.

same-day sale financial

"compensation -- cashless exercise / same-day sale"

aggregate market value financial

"shares have an aggregate market value of $7,959,195.48"

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 ADPT's Form 144 filing disclose about common stock to be sold?

The Form 144 notice discloses a proposed sale of 321,324 shares of ADPT common stock through Goldman Sachs & Co. LLC, with an indicated aggregate market value of $7,959,195.48 and a proposed sale date of August 17, 2026.

How large is the proposed Form 144 sale relative to ADPT shares outstanding?

The proposed Form 144 sale covers 321,324 shares, while the filer reports 159,595,842 ADPT common shares outstanding. This provides a reference point for investors assessing the relative size of the planned disposition.

What is the origin of the ADPT shares covered by the Form 144 notice?

The shares relate to stock options acquired as compensation on February 7, 2018. The Form 144 describes the planned disposition as a compensation – cashless exercise / same-day sale, indicating that the options and resulting shares are tied to prior compensation.

Who is the broker for the ADPT shares in this Form 144 filing?

The filing lists Goldman Sachs & Co. LLC, located at 200 West Street, New York, NY 10282, as the broker through which the 321,324 ADPT common shares are expected to be sold on the NASD market.

What valuation does the Form 144 filer provide for the ADPT shares to be sold?

The filer states an aggregate market value of $7,959,195.48 for the 321,324 ADPT common shares covered by the Form 144 notice, providing a dollar value reference for the proposed sale amount.

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

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Available on EDGAR 08/17/2026 - 05:21 PM Accepted by SEC EDGAR 08/17/2026 - 05:20 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	0001780649
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	1-206-659-0067
Name of Person for Whose Account the Securities are To Be Sold	Chad Robins
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	Officer

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 Stock	Goldman Sachs & Co. LLC 200 West Street New York NY 10282	321324	7959195.48	159595842	08/17/2026	NASD

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 Stock	02/07/2018	Acquired as compensation -- Stock Options	The Issuer			321324	02/07/2018	Compensation -- Cashless exercise / same-day sale

* 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	08/17/2026
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	Goldman Sachs & Co. LLC on behalf of Chad Robins
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)