Sera counsel sells 1,027 shares to cover taxes

SERA PROGNOSTICS, INC.

Rhea-AI Filing Summary

SERA PROGNOSTICS, INC. General Counsel Benjamin Jackson reported a small mandated share sale related to equity compensation. On March 11, 2026, he sold 1,027 shares of Class A common stock in a block trade at a weighted average price of $2.04 per share.

According to the disclosure, the sale was executed solely to cover tax withholding obligations triggered by the vesting of restricted stock units under a required “sell to cover” arrangement, meaning it was not a discretionary trade. After this transaction, Jackson directly holds 114,720 shares of Sera Prognostics common stock.

Insider Trade Summary

Net Seller: 1,027 shares

Net Sell 1 txn

Insider Jackson Benjamin

Role General Counsel

Sold 1,027 shs ($2K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	1,027	$2.04	$2K

Holdings After Transaction: Class A Common Stock — 114,720 shares (Direct)

Footnotes (2)

1. F1. Represents the number of shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock units ("RSUs"). 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.
2. F2. The price reported is a weighted average price. These shares were sold as part of a block trade in multiple transactions at prices ranging from $1.90 to $2.30, inclusive. The Reporting Person will provide to the staff of the Securities and Exchange Commission, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price with regard to the block trade.

FAQ

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

What insider transaction did SERA General Counsel Benjamin Jackson report?

Benjamin Jackson reported selling 1,027 shares of SERA common stock. The sale occurred on March 11, 2026 at a weighted average price of $2.04 per share as part of a single block trade covering multiple prices.

Why did SERA’s General Counsel sell 1,027 shares of company stock?

The 1,027 SERA shares were sold solely to cover tax withholding obligations from vesting restricted stock units. The issuer requires these “sell to cover” transactions, so the filing states this was not a discretionary trade by the reporting person.

What price range applied to Benjamin Jackson’s SERA share sale?

The filing reports a weighted average sale price of $2.04 per SERA share. It explains the shares were sold in a block trade through multiple transactions at prices ranging from $1.90 to $2.30 per share, inclusive, on that date.

How many SERA shares does Benjamin Jackson own after this Form 4 transaction?

After selling 1,027 shares to cover taxes, Benjamin Jackson directly owns 114,720 SERA common shares. This post-transaction holding is disclosed in the Form 4 and shows that the reported sale affected only a small portion of his total shares.

Was Benjamin Jackson’s SERA stock sale a routine tax transaction?

Yes. The filing states the sale was mandated by SERA’s election to satisfy tax withholding through “sell to cover” trades. It expressly notes the transaction does not represent a discretionary decision by Benjamin Jackson to sell SERA shares in the open market.

Can investors obtain detailed pricing for Benjamin Jackson’s SERA block trade?

Yes. The Form 4 notes that detailed information on the number of SERA shares sold at each separate price in the $1.90–$2.30 range will be provided upon request to the SEC staff, the issuer, or any SERA security holder.

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

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Accepted by SEC EDGAR 03/12/2026 - 08:13 PM EDT Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Jackson Benjamin

(Last) (First) (Middle)

C/O SERA PROGNOSTICS, INC.

2749 EAST PARLEYS WAY, SUITE 200

(Street)

SALT LAKE CITY UT 84109

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
SERA PROGNOSTICS, INC. [ SERA ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	General Counsel

3. Date of Earliest Transaction (Month/Day/Year)
03/11/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Class A Common Stock	03/11/2026		S		1,027(1)	D	$2.04(2)	114,720	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Represents the number of shares sold by the Reporting Person to cover tax withholding obligations in connection with the vesting of restricted stock units ("RSUs"). 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.

2. The price reported is a weighted average price. These shares were sold as part of a block trade in multiple transactions at prices ranging from $1.90 to $2.30, inclusive. The Reporting Person will provide to the staff of the Securities and Exchange Commission, the issuer, or any security holder of the issuer, upon request, full information regarding the number of shares sold at each separate price with regard to the block trade.

	/s/ Benjamin G. Jackson	03/12/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.