Proposed sale of 2,179 Class A shares via RSU vesting

SERA notice: a Form 144 lists 2,179 Class A Common shares tied to restricted stock unit vesting scheduled 06/11/2026 for sale through Morgan Stanley Smith Barney LLC on NASDAQ.

Rhea-AI Filing Summary

SERA notice: a Form 144 lists 2,179 Class A Common shares tied to restricted stock unit vesting scheduled 06/11/2026 for sale through Morgan Stanley Smith Barney LLC on NASDAQ. The filing also shows a prior disposition of 1,027 shares on 03/11/2026 (listed with 2,096 in the same row).

Key Figures

Shares listed to be sold: 2,179 shares Shares sold in past 3 months (single line): 1,027 shares Numeric listing on cover row: 38,594,793 +2 more

5 metrics

Shares listed to be sold 2,179 shares Restricted Stock Unit Vesting scheduled 06/11/2026

Shares sold in past 3 months (single line) 1,027 shares Disposition dated 03/11/2026 (Benjamin Jackson)

Numeric listing on cover row 38,594,793 Figure shown adjacent to 06/11/2026 on NASDAQ line

Alternate selling-history figure 2,096 Included in the 'Securities Sold During The Past 3 Months' row

Broker address reference 1 New York Plaza, 38th Floor Morgan Stanley Smith Barney LLC listing

Key Terms

Restricted Stock Unit Vesting, Form 144, Class A Common

3 terms

Restricted Stock Unit Vesting financial

"Securities To Be Sold | Class A Common | 06/11/2026 | Restricted Stock Unit Vesting"

Form 144 regulatory

"CONTENT METADATA: "form_type": "144""

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.

Class A Common financial

"Securities Information | Class A Common | ... | NASDAQ"

FAQ

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

What does the Form 144 for SERA disclose about the 06/11/2026 sale?

It discloses 2,179 Class A Common shares tied to Restricted Stock Unit vesting scheduled 06/11/2026. The sale is listed to occur through Morgan Stanley Smith Barney LLC on NASDAQ.

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

The filing lists a prior disposition of 1,027 Class A Common shares on 03/11/2026. The same row also shows the figure 2,096, as included in the filing's selling-history line.

Is there an outstanding share count shown in the Form 144 for SERA?

The form includes the number 38,594,793 adjacent to the 06/11/2026 line. This numeric value appears on the cover rows of the excerpt as a listed figure.

Who is the broker/placement agent listed on the SERA Form 144?

The broker listed is Morgan Stanley Smith Barney LLC at 1 New York Plaza, 38th Floor, New York, NY. That broker is identified on the securities-to-be-sold line for the 06/11/2026 transaction.

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

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Accepted by SEC EDGAR 06/15/2026 - 04:05 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	0001779964
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	Jackson Benjamin
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	2179	4369	38594793	06/11/2026	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	06/11/2026	Restricted Stock Unit Vesting	Issuer			2179	06/11/2026	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
Benjamin Jackson 2749 E. Parleys Way Suite 200 Salt Lake City UT 84109	Class A Common	03/11/2026	1027	2096

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	06/15/2026
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/ Benjamin G. Jackson
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)