ADPT affiliate files Form 144 to sell common shares

ADPT affiliate filed a Form 144 to sell common stock.

Rhea-AI Filing Summary

ADPT affiliate filed a Form 144 to sell common stock. The notice lists planned sales tied to an exercise of stock options on 06/04/2026 for 21,865 shares and restricted stock units dated 03/04/2025 for 20,220 shares. Recent Rule 10b5-1 sales in the past three months total 91,231 shares across dates in 03/2026 and 04/08/2026, with aggregate proceeds reported in the filing.

Insights

Securities Compliance Counsel

Notice documents affiliate resale activity and option-related sales.

The filing lists proposed sales tied to an exercise of stock options on 06/04/2026 and previously executed 10b5-1 sales totaling 91,231 shares in March–April 2026. The filing names a broker and reports cash proceeds amounts.

Timing and exact execution mechanics follow Rule 144 and any trading-plan limits; subsequent filings will show completed trades and net holdings.

Key Figures

Option exercise shares to be sold: 21,865 shares RSU shares referenced: 20,220 shares 10b5-1 sales (03/05/2026): 38,074 shares +2 more

5 metrics

Option exercise shares to be sold 21,865 shares <date>06/04/2026</date>

RSU shares referenced 20,220 shares <date>03/04/2025</date>

10b5-1 sales (03/05/2026) 38,074 shares <date>03/05/2026</date> proceeds <money>$574,536.66</money>

10b5-1 sales (03/11/2026) 30,593 shares <date>03/11/2026</date> proceeds <money>$430,622.58</money>

10b5-1 sales (04/08/2026) 22,564 shares <date>04/08/2026</date> proceeds <money>$339,941.67</money>

Key Terms

10b5-1, Restricted Stock Units, Exercise of Stock Options

3 terms

10b5-1 regulatory

"10b5-1 Sales for FRANCIS LO 1165 Eastlake Avenue East"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Restricted Stock Units financial

"Restricted Stock Units | Issuer | 20220 | 03/04/2025"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

Exercise of Stock Options financial

"Exercise of Stock Options | Issuer | 21865 | 06/04/2026"

FAQ

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

What does ADPT's Form 144 report?

It reports a proposed sale of common stock by an affiliate tied to option exercise and RSUs. The filing lists 21,865 shares from an option exercise on 06/04/2026 and 20,220 RSU shares dated 03/04/2025, plus recent 10b5-1 sales.

How many shares were sold recently according to the filing?

The filing lists three recent 10b5-1 sales totaling 91,231 shares across 03/05/2026, 03/11/2026, and 04/08/2026. Reported gross proceeds for those transactions are included in the notice.

Are the reported transactions part of a 10b5-1 plan for ADPT?

Yes. The filing identifies executed 10b5-1 sales in March and April 2026. Those entries indicate prearranged plan sales; the notice also shows a separate option exercise scheduled for 06/04/2026 tied to planned dispositions.

Who is the broker handling the proposed sales?

The filing names Morgan Stanley Smith Barney LLC at 1 New York Plaza as the broker. The broker entry appears on the Form 144 cover and is associated with the proposed sales and reported 10b5-1 transactions.

Will this Form 144 affect ADPT's outstanding share count?

This notice itself does not change outstanding shares. It lists proposed and completed sales by an affiliate; the filing does not state overall company outstanding shares or quantify dilution effects in this excerpt.

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

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Accepted by SEC EDGAR 06/04/2026 - 04:27 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	0001780660
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	2066590067
Name of Person for Whose Account the Securities are To Be Sold	FRANCIS LO
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	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	42085	672939.15	160044392	06/04/2026	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	06/04/2026	Exercise of Stock Options	Issuer			21865	06/04/2026	Cash
Common	03/04/2025	Restricted Stock Units	Issuer			20220	03/04/2025	N/A

* 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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for FRANCIS LO 1165 Eastlake Avenue East Seattle WA 98109	Common	04/08/2026	22564	339941.67
10b5-1 Sales for FRANCIS LO 1165 Eastlake Avenue East Seattle WA 98109	Common	03/11/2026	30593	430622.58
FRANCIS LO 1165 Eastlake Avenue East Seattle WA 98109	Common	03/05/2026	38074	574536.66

144: Remarks and Signature

Remarks	The securities to be sold were and will be received upon the exercise of stock options over the next three months. The dates of acquisition and payment were and will be the dates of exercise/sale. The securities to be sold were acquired upon the vesting of restricted stock units during the period of 03/04/2025 through 03/04/2026.
Date of Notice	06/04/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	09/15/2025
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/ Francis Lo
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)