PACIFIC BIOSCIENCES (PACB) officer sale covers RSU tax withholding

Rhea-AI Filing Summary

PACIFIC BIOSCIENCES OF CALIFORNIA, INC. officer Mark Van Oene reported an open-market sale of 6,504 shares of common stock at a weighted average price of $1.514 per share. The shares were mandatorily sold to cover tax withholding obligations from vesting restricted stock units, leaving him with 2,243,634 shares held directly.

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

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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^*

Van Oene Mark

(Last) (First) (Middle)

PACIFIC BIOSCIENCES OF CALIFORNIA, INC.,

1305 O'BRIEN DRIVE

(Street)

MENLO PARK CA 94025

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
PACIFIC BIOSCIENCES OF CALIFORNIA, INC. [ PACB ]

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	See Remarks

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

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
Common Stock	03/03/2026		S		6,504(1)	D	$1.514(2)	2,243,634(3)	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 mandatorily sold to cover tax withholding obligations in connection with the vesting of restricted stock units.

2. This sale price represents the weighted average sale price of the shares sold ranging from $1.49 to $1.56 per share. Upon request by the Commission 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. Includes 7,500 shares purchased on March 2, 2026 under the Company's 2010 Employee Stock Purchase Plan.

Remarks:

Chief Operating Officer

	/s/ Michele Farmer, Attorney-in-fact	03/04/2026
	** 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.

FAQ

What insider transaction did PACB officer Mark Van Oene report?

Mark Van Oene reported selling 6,504 shares of PACB common stock in an open-market transaction. The sale was mandated to cover tax withholding obligations related to the vesting of restricted stock units, according to the filing footnotes.

At what price were the PACB shares sold in Mark Van Oene’s Form 4?

The 6,504 PACB shares were sold at a weighted average price of $1.514 per share. Actual sale prices ranged from $1.49 to $1.56, and detailed trade breakdowns are available upon request from the reporting person or the company.

Why did PACB’s Mark Van Oene sell 6,504 shares of stock?

The shares were mandatorily sold to satisfy tax withholding obligations arising from vesting restricted stock units. This type of sale is typically automatic under company equity award procedures rather than a discretionary portfolio decision by the executive.

How many PACB shares does Mark Van Oene own after the reported sale?

After the 6,504-share sale, Mark Van Oene directly owns 2,243,634 shares of PACB common stock. This total includes 7,500 shares purchased on March 2, 2026 under the company’s 2010 Employee Stock Purchase Plan, as noted in the filing footnotes.

What does transaction code “S” mean in PACB Mark Van Oene’s Form 4?

Transaction code “S” indicates a sale of non-derivative securities, here an open-market transaction. In this case, the filing clarifies the sale was to cover tax withholding on vested restricted stock units, which explains the reason for disposing of the shares.

Was the PACB insider transaction by Mark Van Oene a direct or indirect holding change?

The transaction involved directly held PACB common stock, marked as direct ownership in the filing. The reporting person retains direct ownership of 2,243,634 shares following the mandatory tax-withholding sale described in the Form 4 disclosure.