Sera Prognostics (SERA) files Form 144 to sell 227 vested RSU shares

Rhea-AI Filing Summary

Sera Prognostics (SERA) filed a Form 144 reporting a proposed sale of 227 Class A common shares that vested as restricted stock units on 10/06/2025. The filing lists Morgan Stanley Smith Barney LLC as the broker and shows an aggregate market value of $718 for the proposed sale and 38,061,868 shares outstanding. The notice also discloses three prior sales by Mansoor Raza Mirza in the past three months: 234 shares on 07/07/2025 for $552, 225 shares on 08/05/2025 for $563, and 222 shares on 09/05/2025 for $744.

The filer states the 227 shares arose from RSU vesting on 10/06/2025 and lists the approximate date of sale as 10/06/2025. The signer certifies no undisclosed material adverse information and warns that intentional misstatements are federal crimes.

Positive

• 227 shares stem from RSU vesting, indicating compensation realization rather than new dilution
• Brokered sale via Morgan Stanley Smith Barney LLC suggests standard execution through an established intermediary

Negative

• Proposed sale of 227 shares on 10/06/2025 increases available float in the near term
• Three prior sales totaling 681 shares in the past three months indicate ongoing insider disposals

Insights

Insider Transactions Analyst

TL;DR: An insider plans to sell 227 vested RSU shares on 10/06/2025; recent small sales occurred in prior months.

The filing shows a planned sale of 227 Class A shares that originated from a restricted stock unit vesting on 10/06/2025, with Morgan Stanley Smith Barney LLC named as broker and an indicated aggregate market value of $718. Three prior disposals by Mansoor Raza Mirza in July–September 2025 total 681 shares and list gross proceeds in the filing.

This is a routine Rule 144 notice tied to compensation vesting rather than an extraordinary corporate event. Watch for actual transaction reports that confirm execution and price; if sales occur at materially different prices or sizes, timing and magnitude could be more consequential for short-term float changes.

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

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	227	718	38061868	10/06/2025	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	10/06/2025	Restricted Stock Unit Vesting	Issuer			227	10/06/2025	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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Mansoor Raza Mirza 2749 E. Parleys Way Suite 200 Salt Lake City UT 84109	Class A Common	07/07/2025	234	552
Mansoor Raza Mirza 2749 E. Parleys Way Suite 200 Salt Lake City UT 84109	Class A Common	08/05/2025	225	563
Mansoor Raza Mirza 2749 E. Parleys Way Suite 200 Salt Lake City UT 84109	Class A Common	09/05/2025	222	744

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 SERA's Form 144 filing report?

It reports a proposed sale of 227 Class A common shares (aggregate market value $718) arising from RSU vesting on 10/06/2025.

Who is the seller named in the filing for SERA?

The filing lists Mansoor Raza Mirza as the seller for prior transactions and the notice indicates the 227 shares relate to the account for which the notice is filed.

Which broker will handle the proposed sale for SERA?

The broker named is Morgan Stanley Smith Barney LLC (1 New York Plaza, 38th Floor, New York, NY).

Has this insider sold SERA shares recently?

Yes. The filing discloses prior sales by Mansoor Raza Mirza: 234 shares on 07/07/2025, 225 shares on 08/05/2025, and 222 shares on 09/05/2025.

When is the approximate date of the proposed sale?

The filing lists the approximate date of sale as 10/06/2025.