Mandatory tax-withholding sale reported by PACB (PACB) officer Farmer

Rhea-AI Filing Summary

PACIFIC BIOSCIENCES OF CALIFORNIA, INC. officer Michele Farmer reported an automatic sale of common stock tied to tax withholding. On this Form 4, 2,979 shares were mandatorily sold to cover tax obligations from vesting restricted stock units at a weighted average price of $1.514 per share. After this tax-related transaction, Farmer directly held 305,948 shares of PACB common stock.

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^*

Farmer Michele

(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		2,979(1)	D	$1.514(2)	305,948	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.

Remarks:

Chief Accounting Officer

	/s/ Michele Farmer	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 did PACB officer Michele Farmer report on this Form 4?

Michele Farmer reported an automatic sale of 2,979 PACB common shares. The shares were mandatorily sold to cover tax withholding obligations triggered by vesting restricted stock units, rather than a discretionary open-market sale for investment purposes.

How many PACB shares did Michele Farmer sell and at what price?

The Form 4 shows a sale of 2,979 PACB common shares. The weighted average sale price was $1.514 per share, based on individual trades executed in a range from $1.49 to $1.56 per share, according to the filing footnote.

Why were Michele Farmer’s PACB shares sold in this transaction?

The filing states the shares were mandatorily sold to satisfy tax withholding obligations. These obligations arose when restricted stock units vested, so the sale functioned as a tax payment mechanism rather than a voluntary decision to reduce PACB share ownership.

How many PACB shares does Michele Farmer own after the reported sale?

After the tax-related sale, Michele Farmer directly holds 305,948 PACB common shares. This post-transaction balance is disclosed in the Form 4 and reflects her remaining direct ownership position following the mandatory withholding share sale.

Was the PACB Form 4 sale by Michele Farmer a routine tax withholding event?

Yes. The footnote explains the 2,979 shares were mandatorily sold to cover tax withholding on vesting restricted stock units. This indicates a routine, compensation-related transaction rather than a discretionary open-market sale driven by personal investment decisions.