SERA (SERA) CEO Lindgardt sells 20,755 shares to cover RSU tax withholding

Rhea-AI Filing Summary

SERA PROGNOSTICS, INC. Chief Executive Officer Zhenya Lindgardt reported an open-market sale of Class A common stock. The filing shows 20,755 shares sold at a weighted average price of $2.08 per share. The footnotes explain this was a mandated “sell to cover” transaction to satisfy tax withholding on vesting restricted stock units, not a discretionary sale. After the transaction, Lindgardt directly holds 871,999 shares.

Insider Trade Summary

Net Seller: 20,755 shares ($43,170)

Net Sell 1 txn

Insider Lindgardt Zhenya

Role Chief Executive Officer

Sold 20,755 shs ($43K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	20,755	$2.08	$43K

Holdings After Transaction: Class A Common Stock — 871,999 shares (Direct, null)

Footnotes (1)

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. 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 $1.96 to $2.21, 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.

Key Figures

Shares sold: 20,755 shares Weighted average sale price: $2.08 per share Post-transaction holdings: 871,999 shares +1 more

4 metrics

Shares sold 20,755 shares Open-market sale on 2026-06-09

Weighted average sale price $2.08 per share Tax-related “sell to cover” block trade

Post-transaction holdings 871,999 shares Direct Class A common stock after sale

Trade price range $1.96–$2.21 per share Prices for individual trades within the block

Key Terms

sell to cover, restricted stock units ("RSUs"), weighted average price

3 terms

sell to cover financial

"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"

Sell to cover is when a person who receives company stock through options or awards sells just enough shares immediately to pay required taxes, exercise costs, or fees, keeping the rest. Think of it like cashing part of a bonus to cover the tax bill so you can keep the remainder. For investors, it can create predictable small selling pressure and slightly change the number of shares actually held by insiders without increasing long‑term dilution.

restricted stock units ("RSUs") financial

"in connection with the vesting of restricted stock units ("RSUs")"

Restricted stock units (RSUs) are a company promise to give an employee shares of stock (or cash equivalent) in the future, but only after certain conditions—usually staying with the company for a set time or hitting performance goals—are met. Investors watch RSUs because when they vest they increase the number of shares outstanding and can lead insiders to sell shares, affecting share price, company dilution and the true cost of employee pay.

weighted average price financial

"The price reported is a weighted average price"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

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Form 4 Insider Transactions: What Each Field Means →

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^*

Lindgardt Zhenya

(Last) (First) (Middle)

C/O SERA PROGNOSTICS, INC.

2749 EAST PARLEYS WAY, SUITE 200

(Street)

SALT LAKE CITY UTAH 84109

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/09/2026

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

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

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

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	06/09/2026		S		20,755(1)	D	$2.08(2)	871,999	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 $1.96 to $2.21, 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, Attorney-in-fact	06/10/2026
	** 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.
* Form 4: SEC 1474 (03-26)

FAQ

What insider transaction did SERA CEO Zhenya Lindgardt report on this Form 4 for SERA?

The Form 4 reports that CEO Zhenya Lindgardt sold 20,755 shares of SERA Class A common stock. The shares were sold in the open market as part of a block trade to cover tax withholding obligations tied to vesting restricted stock units.

Was the SERA CEO’s 20,755-share sale a discretionary trade?

No, the sale was not discretionary according to the footnotes. It was a mandated “sell to cover” transaction required by the company’s election to fund tax withholding obligations from restricted stock unit vesting through market sales.

What price did the SERA CEO receive for the 20,755 shares sold?

The reported price is a weighted average of $2.08 per share. The block trade executed through multiple transactions, with individual sales occurring at prices ranging from $1.96 to $2.21 per share, inclusive, as disclosed in the filing footnote.

How many SERA shares does the CEO hold after this tax-related sale?

After the sale, CEO Zhenya Lindgardt directly holds 871,999 shares of SERA Class A common stock. This post-transaction holding figure is disclosed in the Form 4 and provides context for the relative size of the tax-related sale.

Why did SERA sell shares to cover the CEO’s tax withholding obligations?

The company elected to satisfy tax withholding obligations from RSU vesting through “sell to cover” transactions. Under this approach, a portion of vested shares is sold automatically, and the proceeds are used to pay required tax withholdings on the equity compensation.