Personalis (PSNL) CFO sells shares via pre-set Rule 10b5-1 plan

Rhea-AI Filing Summary

Personalis, Inc. executive Aaron Tachibana, the CFO and COO, reported an option exercise and related share sale. On May 29, 2026, he exercised stock options to acquire 38,799 shares of Common Stock at an exercise price of $9.16 per share, then sold the same 38,799 shares in open-market transactions at a weighted average price of $11.58 per share, with individual sale prices ranging from $11.50 to $11.71.

The filing notes these transactions were carried out under a pre-arranged Rule 10b5-1 trading plan adopted on August 7, 2025. Following the sale, Tachibana directly holds 198,833 shares of Common Stock and 68,832 stock options that remain outstanding and are fully vested and exercisable, with an expiration date of March 13, 2029.

Insider Trade Summary 10b5-1

Exercise and Sale: 38,799 shares ($94K approx. pre-tax spread)

Exercise and Sale 3 txns

Insider Tachibana Aaron

Role CFO AND COO

Sold 38,799 shs ($449K)

Approx. gross sale proceeds $449K

Approx. exercise cost $355K

Approx. pre-tax spread $94K

Type	Security	Shares	Price	Value
Exercise	Stock Option (right to buy)	38,799	$0.00	$0.00
Exercise	Common Stock	38,799	$9.16	$355K
Sale	Common Stock	38,799	$11.58	$449K

Holdings After Transaction: Stock Option (right to buy) — 68,832 shares (Direct); Common Stock — 198,833 shares (Direct)

Footnotes (3)

1. F1. The sales and option exercise reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 7, 2025.
2. F2. The price reported above reflects the weighted average price of the shares sold. The sale price ranged from $11.50 to $11.71 per share. Upon request from the SEC staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.
3. F3. The shares subject to the option are fully vested and exercisable.

Key Figures

Shares sold: 38,799 shares Weighted average sale price: $11.58 per share Option exercise price: $9.16 per share +5 more

8 metrics

Shares sold 38,799 shares Common Stock sold in open-market transactions on May 29, 2026

Weighted average sale price $11.58 per share Common Stock sale price, range $11.50–$11.71

Option exercise price $9.16 per share Exercise price for 38,799 stock options into Common Stock

Common shares after transaction 198,833 shares Directly owned Common Stock after May 29, 2026 transactions

Remaining stock options 68,832 options Stock Option (right to buy) position after exercise

Option expiration date March 13, 2029 Expiration for remaining stock options

Rule 10b5-1 plan adoption date August 7, 2025 Date pre-arranged trading plan was adopted

Net shares sold 38,799 shares Net buy/sell shares from transaction summary (net-sell)

Key Terms

Rule 10b5-1 trading plan, Stock Option (right to buy), weighted average price, fully vested and exercisable, +2 more

6 terms

Rule 10b5-1 trading plan regulatory

"were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person"

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.

Stock Option (right to buy) financial

"security_title: "Stock Option (right to buy)""

weighted average price financial

"The price reported above reflects the weighted average price of the shares sold."

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.

fully vested and exercisable financial

"The shares subject to the option are fully vested and exercisable."

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.

derivative exercise/conversion financial

"transaction_action: "derivative exercise/conversion""

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

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 05/29/2026 - 08:27 PM Accepted by SEC EDGAR 05/29/2026 - 08:27 PM Learn about SEC filing dates

FAQ

What insider transaction did Personalis (PSNL) report for Aaron Tachibana?

Aaron Tachibana exercised options and sold matching shares. On May 29, 2026, he exercised stock options for 38,799 Personalis common shares, then sold the same 38,799 shares in open-market transactions, all detailed in a Form 4 insider trading report.

How many Personalis (PSNL) shares did the CFO sell and at what price?

The CFO sold 38,799 Personalis shares. These shares were sold in open-market transactions at a weighted average price of $11.58 per share, with individual sales occurring within a price range of $11.50 to $11.71 per share.

At what price did Aaron Tachibana exercise Personalis (PSNL) stock options?

He exercised options at $9.16 per share. The Form 4 shows a derivative exercise of 38,799 stock options with a conversion or exercise price of $9.16 per share, resulting in the acquisition of an equal number of Personalis common shares.

Was the Personalis (PSNL) insider sale under a Rule 10b5-1 plan?

Yes, the transactions followed a Rule 10b5-1 plan. The filing states the sales and option exercise on May 29, 2026 were effected under a pre-arranged Rule 10b5-1 trading plan adopted by Aaron Tachibana on August 7, 2025.

What are Aaron Tachibana’s remaining Personalis (PSNL) holdings after this Form 4?

He holds common shares and remaining stock options. After the reported transactions, Tachibana directly owns 198,833 shares of Personalis common stock and 68,832 stock options that are fully vested, exercisable, and scheduled to expire on March 13, 2029.

What is the status of the Personalis (PSNL) stock options involved?

The options exercised were fully vested and exercisable. The Form 4 notes that the stock options used to acquire 38,799 shares were already fully vested, with remaining options totaling 68,832 and carrying an expiration date of March 13, 2029.

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^*

Tachibana Aaron

(Last) (First) (Middle)

C/O PERSONALIS, INC.

6600 DUMBARTON CIRCLE

(Street)

FREMONT CALIFORNIA 94555

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
Personalis, Inc. [ PSNL ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CFO AND COO

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/29/2026

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
Common Stock	05/29/2026		M(1)		38,799	A	$9.16	237,632	D
Common Stock	05/29/2026		S(1)		38,799	D	$11.58(2)	198,833	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
Stock Option (right to buy)	$9.16	05/29/2026		M(1)			38,799	(3)	03/13/2029	Common Stock	38,799	$0	68,832	D

Explanation of Responses:

1. The sales and option exercise reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 7, 2025.

2. The price reported above reflects the weighted average price of the shares sold. The sale price ranged from $11.50 to $11.71 per share. Upon request from the SEC staff, the Issuer, or a security holder of the Issuer, the Reporting Person will provide full information regarding the number of shares sold at each separate price within the range set forth in this Form 4.

3. The shares subject to the option are fully vested and exercisable.

	/s/ Aaron Tachibana	05/29/2026
	** 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)