Form 144: Robert Harrison lists 2,000 RSUs for sale

Robert Harrison filed a Form 144 notice relating to proposed sales of Common stock for SERA.

Rhea-AI Filing Summary

Robert Harrison filed a Form 144 notice relating to proposed sales of Common stock for SERA. The filing lists 2,000 Restricted Stock Units dated 08/06/2024 and records multiple 10b5-1 sales earlier in 2026 with specific dates and share counts.

Key Figures

Restricted Stock Units listed: 2,000 10b5-1 sale on 03/24/2026: 2,000 shares 10b5-1 sale on 03/11/2026: 716 shares +2 more

5 metrics

Restricted Stock Units listed 2,000 dated 08/06/2024 (listed as securities to be sold)

10b5-1 sale on 03/24/2026 2,000 shares 10b5-1 Sales for Robert Harrison

10b5-1 sale on 03/11/2026 716 shares 10b5-1 Sales for Robert Harrison

10b5-1 sale on 03/09/2026 3,360 shares 10b5-1 Sales for Robert Harrison

Numeric figures shown with sales 3766.20; 1460.64; 6585.60 Dollar figures adjacent to specific sale rows in the excerpt

Key Terms

Form 144, 10b5-1, Restricted Stock Units

3 terms

Form 144 regulatory

"144: Filer Information ... 144: Securities To Be Sold"

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.

10b5-1 regulatory

"10b5-1 Sales for ROBERT HARRISON ..."

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Restricted Stock Units financial

"Restricted Stock Units | Issuer | 2000 | 08/06/2024"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

FAQ

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

What does SERA's Form 144 filed by Robert Harrison disclose?

It discloses proposed sales of Common stock by Robert Harrison. The notice lists 2,000 Restricted Stock Units dated 08/06/2024 and documents multiple 10b5-1 sales in 2026 with specific dates and share counts.

How many shares or units are listed for sale in the SERA Form 144?

The filing lists 2,000 Restricted Stock Units identified as securities to be sold and multiple executed 10b5-1 sales showing share counts of 716, 2,000, 3,360 and others on specific 2026 dates.

Which 10b5-1 sale dates and share counts appear in the SERA filing?

Reported 10b5-1 sales include 03/24/2026 (2,000 shares), 03/11/2026 (716 shares), 03/09/2026 (3,360 shares), 02/24/2026 (2,000 shares), and 01/27/2026 (2,000 shares), as listed in the notice.

Does the Form 144 show transaction proceeds or prices for SERA sales?

The excerpt shows numeric dollar figures adjacent to some entries. Examples include 3766.20, 1460.64, and 6585.60 shown with corresponding sale rows in the filing excerpt.

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

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Accepted by SEC EDGAR 04/21/2026 - 04:26 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	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	8019900520
Name of Person for Whose Account the Securities are To Be Sold	ROBERT HARRISON
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
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	2000	4580.00	38176089	04/21/2026	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 *
Common	08/06/2024	Restricted Stock Units	Issuer			2000	08/06/2024	N/A

* 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
10b5-1 Sales for ROBERT HARRISON 2749 East Parleys Way, Suite 200 Salt Lake City UT 84109	Common	03/24/2026	2000	3766.20
ROBERT HARRISON 2749 East Parleys Way, Suite 200 Salt Lake City UT 84109	Common	03/11/2026	716	1460.64
ROBERT HARRISON 2749 East Parleys Way, Suite 200 Salt Lake City UT 84109	Common	03/09/2026	3360	6585.60
10b5-1 Sales for ROBERT HARRISON 2749 East Parleys Way, Suite 200 Salt Lake City UT 84109	Common	02/24/2026	2000	4686.00
10b5-1 Sales for ROBERT HARRISON 2749 East Parleys Way, Suite 200 Salt Lake City UT 84109	Common	01/27/2026	2000	5942.00

144: Remarks and Signature

Remarks
Date of Notice	04/21/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	05/21/2025
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)