SEC Form 4
Pacific Biosciences of California, Inc. (PACB) insider trading
In the 12 months to Oct 26, 2026, one PACB insider reported open-market sales of $2.1M across 1 filing; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $2.1M
- 1 filing · 1 insider
- Open-market purchases
- $0
- 0 filings
- Pre-arranged sales (10b5-1)
- 1 of 1
- All $2.1M sold was pre-arranged
Who traded PACB, and when
- Sale
- Sale, pre-arranged (10b5-1)
PACB daily close from Oct 27, 2025 to Oct 26, 2026, between $1.11 and $2.87, last $2.25. 1 sale and 0 purchase filings by 1 insider, marked at their filing dates. James R. Gibson II, Officer (see filing): sold $2.1M across 1 filing, first filed Oct 8, 2026, last Oct 8, 2026.
Largest mark · tap a row for others
James R. Gibson II · Officer (see filing)
Sale $2,056,921
661,815 shares at $3.11 avg
Filed Oct 8, 2026 · traded Oct 6
Pre-arranged (10b5-1) · close on filing date $2.30
James R. Gibson II · Officer (see filing)
Officer (see filing)
$2.1M soldOpen-market trades
1 filing in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| James R. Gibson II | Officer (see filing) | $2.1M | — | 1 | 100% of sales |
| Filed | Insider | Type | Shares | Avg price | Value | Held after | Source |
|---|---|---|---|---|---|---|---|
traded | James R. Gibson II Officer (see filing) | SalePre-arranged (10b5-1) | 661,815 | $3.11 | $2.1M | 1,083,848 |
GET /stocks/filings/vX/form-4?tickers=PACB&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"PACB"
],
"issuer_cik": "0001299130",
"owner_cik": "0001384133",
"accession_number": "0001384133-26-000004",
"form_type": "4",
"filing_date": "2026-10-08",
"period_of_report": "2026-10-06",
"issuer_name": "PACIFIC BIOSCIENCES OF CALIFORNIA, INC.",
"issuer_trading_symbol": "PACB",
"owner_name": "Gibson James R II",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "See Remarks",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Common Stock",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-10-06",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 661815,
"transaction_price_per_share": 3.108,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 1083848,
"transaction_value": 2056921.02,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 22, 2026."
},
{
"id": "F2",
"description": "This sale price represents the weighted average sale price of the shares sold ranging from $3.00 to $3.33 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"
}
]
}
// trimmed to 1 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 19 records
- Option exercises1 record
- Tax withholding (sold to cover)11 records
- Grants and awards7 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Pre-arranged (10b5-1)
- The insider marked the filing as made under a trading plan set up in advance (SEC Rule 10b5-1). The mark covers the whole filing, and an unmarked filing may still be under a plan.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
Frequently asked questions
How current is PACB’s insider data?
These are PACB Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
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Track PACB insider trades with your agent
This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for PACB every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
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