SERA Form 144: RSU vesting notice

SERA filed a Form 144 reporting Restricted Stock Unit vesting for Class A Common stock on 03/09/2026.

Rhea-AI Filing Summary

SERA filed a Form 144 reporting Restricted Stock Unit vesting for Class A Common stock on 03/09/2026. The filing also records a prior resale of 1,332 shares on 12/10/2025. The notice lists numbers tied to the securities and intermediary details.

FAQ

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

What does the SERA Form 144 disclose about RSU vesting?

The Form 144 discloses a Restricted Stock Unit vesting event for Class A Common stock dated 03/09/2026. It lists the vesting-related securities and intermediary details but does not specify sale proceeds or exact disposition instructions in the provided excerpt.

How many shares were sold by SERA insiders in the past three months?

The excerpt shows a reported resale of 1,332 shares on 12/10/2025. This line appears under "Securities Sold During The Past 3 Months" and is presented as a historic resale amount tied to the reporting individual.

Does the filing state who is the broker or intermediary handling the transaction?

Yes, the excerpt names an intermediary: Morgan Stanley Smith Barney LLC, 1 New York Plaza. The filing lists this broker address and related registration details adjacent to the Class A Common security lines in the excerpt.

What other numeric details appear in the Form 144 excerpt for SERA?

The filing excerpt includes several numeric entries such as 3038, 5964, and 38,594,793, alongside the RSU vesting date 03/09/2026. The excerpt does not attach explicit labels to all these numbers within the provided text.

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

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Accepted by SEC EDGAR 03/10/2026 - 05:50 PM EDT 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	0001870674
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	Sera Prognostics, Inc.
SEC File Number	001-40606
Address of Issuer	2749 East Parleys Way Suite 200 Salt Lake City UTAH 84109
Phone	(801)-990-0520
Name of Person for Whose Account the Securities are To Be Sold	Boniface John J.
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
Class A Common	Morgan Stanley Smith Barney LLC 1 New York Plaza 38th Floor New York NY 10004	3038	5964	38594793	03/09/2026	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 *
Class A Common	03/09/2026	Restricted Stock Unit Vesting	Issuer			3038	03/09/2026	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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
John J. Boniface 2749 E. Parleys Way Suite 200 Salt Lake City UT 84109	Class A Common	12/10/2025	1332	4405

144: Remarks and Signature

Remarks	The sale on this form represents the number of shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock units. The sale is mandated by the Issuer's election to require the satisfaction of tax withholding obligations to be funded by sell to cover transactions and does not represent a discretionary transaction by the Reporting Person.
Date of Notice	03/10/2026
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/ John Boniface
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)