Sera Prognostics officer plans 486-share sale

Officer Tiffany Inglis filed a Form 144 for a small, issuer-mandated tax-withholding sale of SERA Class A common shares.

Rhea-AI Filing Summary

Sera Prognostics, Inc. (SERA) is the issuer for which officer Tiffany Inglis has filed a Form 144 notice to sell 486 shares of Class A Common Stock through Morgan Stanley Smith Barney LLC on or about September 10, 2026. The filing states the sale is to cover tax withholding obligations from restricted stock unit vesting and is mandated by the issuer’s election, rather than being a discretionary transaction by the reporting person. During the prior three months, Inglis previously sold 362 shares of Class A Common Stock.

Key Figures

Shares to be sold: 486 shares Aggregate market value of planned sale: 972 aggregate value units Shares outstanding: 39,449,466 shares +2 more

5 metrics

Shares to be sold 486 shares Class A Common Stock proposed for sale on or about September 10, 2026

Aggregate market value of planned sale 972 aggregate value units Aggregate market value for the 486 shares listed in the Form 144

Shares outstanding 39,449,466 shares Class A Common Stock outstanding for Sera Prognostics, Inc. at the time of notice

Shares sold in past 3 months 362 shares Class A Common Stock sold by Tiffany Inglis on June 11, 2026

Date of notice September 11, 2026 Date the Form 144 notice was signed and filed by Tiffany Inglis

Key Terms

Rule 144, Restricted Stock Unit Vesting, sell to cover transactions

3 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 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.

Restricted Stock Unit Vesting financial

"Class A Common | 09/10/2026 | Restricted Stock Unit Vesting | Issuer"

sell to cover transactions financial

"to be funded by sell to cover transactions and does not represent"

FAQ

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

What does the Form 144 filing disclose for SERA Prognostics, Inc. (SERA)?

It discloses that officer Tiffany Inglis intends to sell 486 shares of SERA Class A Common Stock around September 10, 2026, under Rule 144, through Morgan Stanley Smith Barney LLC.

Why is Tiffany Inglis selling SERA (SERA) shares under this Form 144?

The notice states the sale represents shares sold to cover tax withholding obligations related to the vesting of restricted stock units, and that it is mandated by the issuer’s election to use sell to cover transactions, not a discretionary trade.

How many SERA (SERA) shares does the Form 144 say will be sold?

The Form 144 reports that 486 shares of Class A Common Stock are proposed to be sold, with an aggregate market value of 972 in the filing’s stated units.

What does the Form 144 show about SERA’s shares outstanding?

For Sera Prognostics, Inc., the Form 144 lists 39,449,466 shares of Class A Common Stock as outstanding at the time of the notice, providing context for the relative size of the planned sale.

What prior SERA (SERA) share sales by Tiffany Inglis are reported in this Form 144?

The filing’s three‑month history table lists a prior sale by Tiffany Inglis of 362 shares of Class A Common Stock on June 11, 2026. The filing does not further characterize that earlier transaction.

Which broker is listed for the planned SERA (SERA) share sale?

The Form 144 identifies Morgan Stanley Smith Barney LLC, located at 1 New York Plaza, New York, as the broker handling the proposed sale of 486 shares of SERA Class A Common Stock on or about September 10, 2026.

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

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Available on EDGAR 09/11/2026 - 04:06 PM Accepted by SEC EDGAR 09/11/2026 - 04:05 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	0002091798
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	Inglis Tiffany Eul Davis
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	486	972	39449466	09/10/2026	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	09/10/2026	Restricted Stock Unit Vesting	Issuer			486	09/10/2026	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
Tiffany Inglis 2749 E. Parleys Way Suite 200 Salt Lake City UT 84109	Class A Common	06/11/2026	362	726

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	09/11/2026
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/ Tiffany Inglis
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)