Serge Saxonov (TXG) reports multiple 2026 sales and a 35,270-share RSU grant

Rhea-AI Filing Summary

Serge Saxonov reported proposed and recent sales of Common Stock via a Form 144 notice and an RSU grant. The filing lists a Restricted Stock Unit grant of 35,270 shares dated 05/21/2026 (services rendered) and multiple open-market sales in 2026, including transactions on 02/23/2026, 03/02/2026, 03/23/2026, 03/24/2026, and 04/14/2026. The document reflects routine insider sales activity and a compensation-related equity grant.

Insights

Securities Attorney

Form 144 notifies the market of proposed sales by an affiliate.

Form 144 is a regulatory notice required when affiliates propose to sell restricted or control securities in reliance on Rule 144. The filing lists proposed and recent sales by the reporting person and records the RSU grant dated 05/21/2026.

Timing and whether sales occurred under Rule 144 or other exemptions is not stated here; subsequent trade confirmations or Form 4/5 filings would show completed transactions.

Equity Compensation Analyst

RSU grant of 35,270 shares appears as compensation for services.

The entry shows a Restricted Stock Unit grant dated 05/21/2026 for 35,270 shares tied to services rendered. This increases potential share holdings subject to vesting and applicable transfer restrictions.

Whether these RSUs are vested or transferable is not disclosed; follow-up filings or the company’s equity plan disclosures would provide vesting and transferability details.

Key Figures

RSU grant: 35,270 shares Sale on 02/23/2026: 9,632 shares Sales on 03/02/2026: 14,292 shares and 1,860 shares +3 more

6 metrics

RSU grant 35,270 shares Restricted Stock Unit Grant dated 05/21/2026 (services rendered)

Sale on 02/23/2026 9,632 shares Open-market sale reported with proceeds $178,927.88

Sales on 03/02/2026 14,292 shares and 1,860 shares Two transactions on 03/02/2026 with proceeds $323,985.35 and $43,111.27

Sale on 03/23/2026 10,000 shares Open-market sale with proceeds $191,297.00

Sale on 03/24/2026 5,000 shares Open-market sale with proceeds $97,611.50

Sale on 04/14/2026 5,000 shares Open-market sale with proceeds $122,784.00

Key Terms

Form 144, Restricted Stock Unit (RSU), Rule 144

3 terms

Form 144 regulatory

"Form 144 notice of proposed sale of securities by an affiliate"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Restricted Stock Unit (RSU) financial

"Restricted Stock Unit Grant 35,270 dated 05/21/2026 Services Rendered"

A restricted stock unit (RSU) is a promise from a company to give an employee company shares (or cash equal to their value) at a future date if certain conditions are met, such as staying with the company or hitting performance targets. For investors, RSUs matter because when they convert into actual shares they increase the number of shares available and can create selling pressure as employees cash out—think of them as a future paycheck paid in company stock.

Rule 144 regulatory

"Securities To Be Sold and sales reporting context under Form 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.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

Relationship to Issuer

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	Morgan Stanley Smith Barney LLC, Executive Services 200 W Civic Center Drive 4th Floor Sandy UT 84070	17948	442956.64	116877317	05/22/2026	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 Stock	05/21/2026	Restricted Stock Unit Grant	Issuer			35270	05/21/2026	Services Rendered

* 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
Serge Saxonov 6230 Stoneridge Mall Road Pleasanton CA 94588	Common Stock	02/23/2026	9632	178927.88
Serge Saxonov 6230 Stoneridge Mall Road Pleasanton CA 94588	Common Stock	03/02/2026	14292	323985.35
Serge Saxonov 6230 Stoneridge Mall Road Pleasanton CA 94588	Common Stock	03/02/2026	1860	43111.27
Serge Saxonov 6230 Stoneridge Mall Road Pleasanton CA 94588	Common Stock	03/23/2026	10000	191297.00
Serge Saxonov 6230 Stoneridge Mall Road Pleasanton CA 94588	Common Stock	03/24/2026	5000	97611.50
Serge Saxonov 6230 Stoneridge Mall Road Pleasanton CA 94588	Common Stock	04/14/2026	5000	122784.00

144: Remarks and Signature

Remarks

Date of Notice

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What does the Form 144 for TXG (Serge Saxonov) report?

It reports proposed and recent sales of Common Stock and an RSU grant. The filing lists a 35,270-share RSU grant dated 05/21/2026 and multiple sales in early 2026.

How many shares were granted as RSUs in the filing?

The filing shows a Restricted Stock Unit grant of 35,270 shares dated 05/21/2026 tied to services rendered, as recorded in the securities-to-be-sold section.

Which recent sales by the reporting person are listed?

Recorded open-market sales include 9,632 shares on 02/23/2026, 14,292 and 1,860 shares on 03/02/2026, 10,000 on 03/23/2026, 5,000 on 03/24/2026, and 5,000 on 04/14/2026.

Does Form 144 confirm the sales were completed?

Form 144 notifies proposed or intended sales under Rule 144 but does not, by itself, confirm settlement. Completed trade details would appear in transaction confirmations or subsequent Forms 4/5.

What is the stated reason for the RSU grant?

The RSU grant of 35,270 shares is annotated as granted for services rendered and dated 05/21/2026 in the filing.