Robert Harrison files Form 144 to sell 716 SERA shares

Robert Harrison reports proposed resale of 716 shares of Class A Common associated with Restricted Stock Unit vesting on 03/11/2026.

Rhea-AI Filing Summary

Robert Harrison reports proposed resale of 716 shares of Class A Common associated with Restricted Stock Unit vesting on 03/11/2026.

The filing also lists completed open‑market sales by Robert Harrison: 616 shares on 12/10/2025, 2,000 shares on 12/30/2025, 2,000 shares on 01/27/2026, 2,000 shares on 02/24/2026, and 3,360 shares on 03/09/2026.

Insights

Securities Attorney

Notice of resale for vested RSUs and a series of recent sales by an affiliate.

The filing records a proposed resale of 716 shares tied to Restricted Stock Unit vesting on 03/11/2026. It also lists five prior sales totaling 9,976 shares across 12/10/2025–03/09/2026, indicating recent liquidity activity.

These entries serve as a securities law disclosure of intended and recent resale activity by an affiliate; cash‑flow treatment and any sale plan terms are not stated in the excerpt. Subsequent filings may disclose additional details such as brokers or Rule 10b5‑1 plan language.

FAQ

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

What did Robert Harrison disclose in the Form 144 for SERA?

He disclosed a proposed resale of 716 shares of Class A Common tied to Restricted Stock Unit vesting on 03/11/2026. The filing also lists five prior sales totaling 9,976 shares between 12/10/2025 and 03/09/2026.

Does the filing show completed sales by Robert Harrison before the proposed sale?

Yes. The filing lists completed sales of 616, 2,000, 2,000, 2,000, and 3,360 shares on 12/10/2025, 12/30/2025, 01/27/2026, 02/24/2026, and 03/09/2026, respectively.

Is the 716 shares amount tied to an RSU vesting event?

Yes. The filing lists the 716 shares under "Securities To Be Sold" with the description "Restricted Stock Unit Vesting" and the date 03/11/2026, indicating the resale is associated with vested RSUs.

Does the Form 144 state who will receive proceeds from the proposed sale?

The excerpt does not state proceeds recipients. The item lists the sale as tied to the issuer vesting event, but the filing does not specify the cash‑flow treatment or who will receive proceeds in the provided text.

Are sale method or broker details provided in this excerpt?

No. The provided excerpt lists dates and share amounts but does not include broker names, methods of sale, or mention of a prearranged trading plan in the visible content.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google

Add on Google Not now

Accepted by SEC EDGAR 03/12/2026 - 08:08 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	0001421563
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	Harrison Robert Gardner
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	716	1462	38594793	03/11/2026	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	03/11/2026	Restricted Stock Unit Vesting	Issuer			716	03/11/2026	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
Robert Harrison 2749 E. Parleys Way Suite 200 Salt Lake City UT 84109	Class A Common	12/10/2025	616	2039
Robert Harrison 2749 E. Parleys Way Suite 200 Salt Lake City UT 84109	Class A Common	12/30/2025	2000	6003
Robert Harrison 2749 E. Parleys Way Suite 200 Salt Lake City UT 84109	Class A Common	01/27/2026	2000	5942
Robert Harrison 2749 E. Parleys Way Suite 200 Salt Lake City UT 84109	Class A Common	02/24/2026	2000	4900
Robert Harrison 2749 E. Parleys Way Suite 200 Salt Lake City UT 84109	Class A Common	03/09/2026	3360	6596

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	03/12/2026
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/ Robert Harrison
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)