Director at Sera Prognostics (SERA) sells 1,560 planned shares

Rhea-AI Filing Summary

Sera Prognostics director Sandra AJ Lawrence sold 1,560 shares of Class A common stock in an open-market transaction. The sale on June 8, 2026 was executed at a weighted average price of $2.15 per share, with individual trades ranging from $2.10 to $2.23. After the sale, Lawrence directly holds 16,473 shares. The transaction was carried out under a pre-arranged Rule 10b5-1 trading plan adopted on June 10, 2025.

Insights

Equity market analyst

Routine 10b5-1 sale of a small portion of holdings.

Director Sandra AJ Lawrence sold 1,560 Sera Prognostics shares in an open-market transaction at a weighted average of $2.15 per share. This represents only a fraction of her stake, as she continues to hold 16,473 shares directly after the sale.

The filing notes the sale was effected under a Rule 10b5-1 trading plan adopted on June 10, 2025, indicating it was pre-scheduled rather than opportunistic. Such planned transactions are typically viewed as routine portfolio management rather than a strong signal about the company’s outlook.

Insider Trade Summary 10b5-1

Net Seller: 1,560 shares ($3,354)

Net Sell 1 txn

Insider Lawrence Sandra AJ

Role null

Sold 1,560 shs ($3K)

Type	Security	Shares	Price	Value
Sale	Class A Common Stock	1,560	$2.15	$3K

Holdings After Transaction: Class A Common Stock — 16,473 shares (Direct, null)

Footnotes (1)

1. The transaction(s) reported on this Form 4 was/were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 10, 2025. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.10 to $2.23, 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.

Key Figures

Shares sold: 1,560 shares Weighted average sale price: $2.15 per share Post-transaction holdings: 16,473 shares +2 more

5 metrics

Shares sold 1,560 shares Open-market sale on June 8, 2026

Weighted average sale price $2.15 per share Class A Common Stock sale

Post-transaction holdings 16,473 shares Director’s direct ownership after sale

Sale price range $2.10–$2.23 per share Range of prices for individual trades

Trading plan adoption date June 10, 2025 Rule 10b5-1 trading plan used for sale

Key Terms

Rule 10b5-1 trading plan, weighted average price, open-market sale, Class A Common Stock

4 terms

Rule 10b5-1 trading plan regulatory

"The transaction(s) reported on this Form 4 was/were effected pursuant to a Rule 10b5-1 trading plan adopted..."

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"The price reported is a weighted average price. These shares were sold in multiple transactions..."

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.

open-market sale financial

"transaction_action": "open-market sale""

An open-market sale is when a shareholder sells existing shares directly on a public exchange to any willing buyer, rather than through a private deal. Think of it like putting goods on a busy market stall where price is set by supply and demand; for investors it matters because such sales increase available supply, can put short-term downward pressure on the stock price, and signal changes in liquidity or investor confidence.

Class A Common Stock financial

"security_title": "Class A Common Stock""

Class A common stock is a category of a company’s shares that carries a specific set of ownership rights—most commonly defined voting power and claims on dividends—set out in the company’s charter. For investors it matters because the class determines how much influence you have over corporate decisions, the share’s likely dividend and trading behavior, and how it compares in value to other share classes, like choosing a particular seat with different privileges at the company’s decision-making table.

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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).

X

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^*

Lawrence Sandra AJ

(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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/08/2026

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	06/08/2026		S(1)		1,560	D	$2.15(2)	16,473	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. The transaction(s) reported on this Form 4 was/were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 10, 2025.

2. The price reported is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.10 to $2.23, 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.

	/s/ Benjamin G. Jackson, Attorney-in-fact	06/09/2026
	** 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 Prognostics (SERA) report?

Sera Prognostics reported that director Sandra AJ Lawrence sold 1,560 shares of Class A common stock. The open-market transaction occurred on June 8, 2026 at a weighted average price of $2.15 per share, under a pre-arranged Rule 10b5-1 trading plan.

At what price did the SERA director sell her shares?

The director sold 1,560 shares at a weighted average price of $2.15 per share. Individual trades were executed between $2.10 and $2.23, and the filing notes she can provide the exact breakdown of shares sold at each separate price upon request.

How many Sera Prognostics shares does the director hold after this sale?

After the reported sale, director Sandra AJ Lawrence directly holds 16,473 shares of Sera Prognostics Class A common stock. This indicates the 1,560 shares sold represented only a portion of her position, with the majority of her holdings remaining intact following the transaction.

Was the SERA insider sale made under a Rule 10b5-1 trading plan?

Yes. The filing states the transaction was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on June 10, 2025. Such plans pre-schedule trades, making the timing less indicative of the insider’s current views on the stock.

What does a weighted average sale price mean for the SERA Form 4?

The weighted average price of $2.15 reflects multiple trades executed between $2.10 and $2.23 per share. Instead of listing each trade separately, the filing reports this single average, and the insider offers to provide full trade-by-trade price details to regulators or shareholders upon request.