STOCK TITAN
  1. Home
  2. Sec-filings
  3. PACB
  4. [Form 4] PACIFIC BIOSCIENCES OF CALIFORNIA, INC. Insider Trading Activity

PacBio (NASDAQ: PACB) CEO share sale covers RSU tax withholding

Filing Impact
(Neutral)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

PACIFIC BIOSCIENCES OF CALIFORNIA, INC. (PACB) reported that President & CEO Mark Van Oene had 26,911 shares of common stock sold on 2026-08-17 in a transaction coded as a sale. A footnote states these shares were automatically sold to cover tax withholding obligations related to vesting restricted stock units, rather than a discretionary open-market sale. The weighted average sale price ranged from $1.13 to $1.15 per share, and Van Oene now holds 2,705,853 shares of PACB common stock directly.

Positive

  • None.

Negative

  • None.
Insider Van Oene Mark
Role See Remarks
Sold 26,911 shs ($30K)
Type Security Shares Price Value
Sale Common Stock F1, F2 26,911 $1.13 $30K
Holdings After Transaction: Common Stock — 2,705,853 shares (Direct)
Footnotes (2)
  1. F1. Represents the number of shares automatically 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 $1.13 to $1.15 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.
Shares sold 26,911 shares Common stock sold on 2026-08-17 to cover tax withholding
Weighted average sale price range $1.13 to $1.15 per share Range of prices for shares sold in the reported transaction
Shares owned after transaction 2,705,853 shares Total PACB common shares directly held by Mark Van Oene after the sale
Net shares sold 26,911 shares Net-sell direction per transaction summary
Transactions coded as sales 1 transaction Single non-derivative sale reported in this Form 4
weighted average sale price financial
"This sale price represents the weighted average sale price of the shares"
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
"sold to cover tax withholding obligations in connection with the vesting"

FAQ

What insider transaction did PACB report for President & CEO Mark Van Oene?
PACB reported that Mark Van Oene had 26,911 shares of common stock sold on 2026-08-17. The company notes the shares were automatically sold to cover tax withholding obligations arising from vesting restricted stock units, not a discretionary sale.

At what price were Mark Van Oene’s PACB shares sold in this Form 4 filing?
The reported sale used a weighted average price ranging from $1.13 to $1.15 per share. The filing states the insider will provide full details of the number of shares sold at each price within this range upon request.

How many PACB shares does Mark Van Oene hold after this reported transaction?
After the reported tax-withholding-related sale, Mark Van Oene directly holds 2,705,853 shares of PACB common stock. This post-transaction holding is explicitly listed as the total shares following the transaction in the Form 4 data.

Was the PACB insider sale under a Rule 10b5-1 trading plan?
The Form 4 indicates the Rule 10b5-1 checkbox is not affirmed for this transaction. Instead, the footnote clarifies that the shares were sold automatically to satisfy tax withholding obligations from vesting restricted stock units.

Does the PACB Form 4 indicate a discretionary sale by Mark Van Oene?
The transaction is coded as a sale, but a key footnote states the shares were automatically sold to cover tax withholding obligations. This suggests the sale mechanics were tied to RSU vesting rather than a discretionary portfolio decision.

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

See more from StockTitan in Google Search and AI answers. Adds StockTitan as a preferred source · opens Google
Add on Google
Form 4 Insider Transactions: What Each Field Means →
SEC Form 4
FORM 4UNITED 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*
Van Oene Mark
(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)
Director10% Owner
XOfficer (give title below)Other (specify below)
See Remarks
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/17/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm 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)
CodeVAmount(A) or (D)Price
Common Stock08/17/2026S26,911(1)D$1.13(2)2,705,853D
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)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. Represents the number of shares automatically 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 $1.13 to $1.15 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:
President & CEO
/s/ Brett Atkins, Attorney-in-fact08/18/2026
** Signature of Reporting PersonDate
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)

Source: View Original Filing on SEC EDGAR