PACB officer sells shares to cover tax withholding

PACIFIC BIOSCIENCES OF CALIFORNIA, INC. officer James R. Gibson II reported an open-market sale of 88,185 shares of common stock at a weighted average price of $1.37 per share.

Accepted by SEC EDGAR 04/03/2026 - 04:05 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

PACIFIC BIOSCIENCES OF CALIFORNIA, INC. officer James R. Gibson II reported an open-market sale of 88,185 shares of common stock at a weighted average price of $1.37 per share. According to the filing, these shares were mandatorily sold to cover tax withholding obligations tied to vesting restricted stock units, and he continues to hold 1,245,663 shares directly.

Insider Trade Summary

Net Seller: 88,185 shares

Net Sell 1 txn

Insider Gibson James R II

Role See Remarks

Sold 88,185 shs ($121K)

Share of Position Sold 6.6%

Type	Security	Shares	Price	Value
Sale	Common Stock	88,185	$1.37	$121K

Holdings After Transaction: Common Stock — 1,245,663 shares (Direct)

Holdings Before and After: Common Stock, 1,333,848 to 1,245,663 shares (Direct)

Footnotes (2)

1. F1. Represents the number of shares mandatorily sold to cover tax withholding obligations in connection with the vesting of restricted stock units.
2. F2. This sale price represents the weighted average sale price of the shares sold ranging from $1.35 to $1.39 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.

Key Figures

Shares sold: 88,185 shares Weighted average sale price: $1.37 per share Price range: $1.35–$1.39 per share +1 more

4 metrics

Shares sold 88,185 shares Open-market sale on 2026-04-01

Weighted average sale price $1.37 per share Common stock sale

Price range $1.35–$1.39 per share Range of individual trade prices

Shares held after transaction 1,245,663 shares Direct ownership following sale

Key Terms

restricted stock units, tax withholding obligations, weighted average sale price

3 terms

restricted stock units financial

"in connection with the vesting of restricted stock units"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

tax withholding obligations financial

"mandatorily sold to cover tax withholding obligations"

weighted average sale price financial

"This sale price represents the weighted average sale price of the shares"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did PACB officer James R. Gibson II report?

He reported an open-market sale of 88,185 PACB common shares. The filing explains the shares were mandatorily sold to satisfy tax withholding obligations arising from vesting restricted stock units, rather than a discretionary sale of investment holdings.

At what price were the PACB shares sold in James R. Gibson II’s Form 4?

The reported weighted average sale price was $1.37 per share. A footnote states individual trades occurred between $1.35 and $1.39, and detailed per-trade pricing is available from the insider upon request from regulators, the issuer, or security holders.

Why were James R. Gibson II’s PACB shares sold according to the Form 4?

The shares were mandatorily sold to cover tax withholding obligations from vesting restricted stock units. This means the disposition was driven by tax requirements linked to equity compensation, not by an independent decision to reduce his economic exposure to PACB stock.

How many PACB shares does James R. Gibson II hold after this transaction?

After the tax-related sale, he directly holds 1,245,663 shares of PACB common stock. This remaining position shows he continues to own a substantial number of shares following the mandatory disposition used to satisfy withholding obligations on his vested restricted stock units.

Does the PACB Form 4 indicate the sale was related to restricted stock units?

Yes. A footnote states the sold shares represent those mandatorily disposed to cover tax withholding from the vesting of restricted stock units. This clarifies the transaction is tied to equity compensation mechanics rather than a typical open-market portfolio decision by the officer.

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

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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^*

Gibson James R II

(Last) (First) (Middle)

PACIFIC BIOSCIENCES OF CALIFORNIA, INC.

1305 O'BRIEN DRIVE

(Street)

MENLO PARK CALIFORNIA 94025

(City) (State) (Zip)

UNITED STATES

(Country)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
04/01/2026

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	04/01/2026		S		88,185(1)	D	$1.37(2)	1,245,663	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 $1.35 to $1.39 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 Financial Officer

	/s/ Brett Atkins, Attorney-in-fact	04/03/2026
	** 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)