PACB
Pacific Biosciences of California
NASDAQ: PACB · HEALTHCARE · MEDICAL DEVICES
$2.83
+15.51% today
Updated 2026-10-28
Market cap
$655.85M
P/E ratio
—
P/S ratio
4.12x
EPS (TTM)
$-0.43
Dividend yield
—
52W range
$1 – $3
Volume
13.0M
Pacific Biosciences of California (PACB) Insider transactions
Net insider activity
Net buying (20,226,856 shares)
Buy transactions
65
Sell transactions
32
All transactions
| Date | Insider | Title | Type | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-10-06 | GIBSON, JAMES R II | See Remarks | M | 500,000 | — | — |
| 2026-10-06 | GIBSON, JAMES R II | See Remarks | S | 661,815 | $3.11 | $2.06M |
| 2026-10-06 | GIBSON, JAMES R II | See Remarks | M | 500,000 | $1.18 | $590000.00 |
| 2026-08-17 | VAN, OENE MARK | See Remarks | Sale | 26,911 | $1.13 | $30409.43 |
| 2026-08-10 | VAN, OENE MARK | See Remarks | Buy | 1,967,888 | — | — |
| 2026-08-10 | VAN, OENE MARK | See Remarks | Buy | 489,130 | — | — |
| 2026-06-03 | VALANTINE, HANNAH | Director | Buy | 223,492 | — | — |
| 2026-06-03 | SMITH, CHRISTOPHER M | Director | Buy | 223,492 | — | — |
| 2026-06-03 | ORDONEZ, KATHY | Director | Buy | 223,492 | — | — |
| 2026-06-03 | MOHR, MARSHALL | Director | Buy | 223,492 | — | — |
| 2026-06-03 | MILLIGAN, JOHN F | Director | Buy | 223,492 | — | — |
| 2026-06-03 | LIVINGSTON, RANDALL S | Director | Buy | 223,492 | — | — |
| 2026-06-03 | GIBSON, CHRISTOPHER | Director | Buy | 74,497 | — | — |
| 2026-06-03 | ERICSON, WILLIAM W. | Director | Buy | 223,492 | — | — |
| 2026-04-08 | GIBSON, CHRISTOPHER | Director | Buy | 77,842 | — | — |
| 2026-04-08 | GIBSON, CHRISTOPHER | Director | Buy | 57,473 | — | — |
| 2026-04-01 | GIBSON, JAMES R II | See Remarks | Sale | 88,185 | $1.37 | $120813.45 |
| 2026-03-03 | VAN, OENE MARK | See Remarks | Sale | 6,504 | $1.51 | $9847.06 |
| 2026-03-03 | HENRY, CHRISTIAN O | See Remarks | Sale | 12,497 | $1.51 | $18920.46 |
| 2026-03-03 | GIBSON, CHRISTOPHER | Director | Buy | 73,087 | — | — |
| 2026-03-03 | GIBSON, CHRISTOPHER | Director | Buy | 53,913 | — | — |
| 2026-03-03 | FARMER, MICHELE | See Remarks | Sale | 2,979 | $1.51 | $4510.21 |
| 2026-02-27 | VAN, OENE MARK | See Remarks | Buy | 1,000,000 | — | — |
| 2026-02-27 | VAN, OENE MARK | See Remarks | Buy | 500,000 | — | — |
| 2026-02-27 | HENRY, CHRISTIAN O | See Remarks | Buy | 1,841,621 | — | — |
| 2026-02-27 | HENRY, CHRISTIAN O | See Remarks | Buy | 920,810 | — | — |
| 2026-02-27 | GIBSON, JAMES R II | See Remarks | Buy | 667,696 | — | — |
| 2026-02-27 | GIBSON, JAMES R II | See Remarks | Buy | 333,848 | — | — |
| 2026-02-27 | FARMER, MICHELE | See Remarks | Buy | 179,670 | — | — |
| 2026-02-27 | FARMER, MICHELE | See Remarks | Buy | 89,835 | — | — |
| 2026-02-18 | VAN, OENE MARK | See Remarks | Sale | 55,107 | $1.63 | $89769.30 |
| 2026-02-18 | HENRY, CHRISTIAN O | See Remarks | Sale | 140,874 | $1.63 | $229483.75 |
| 2026-02-18 | FARMER, MICHELE | See Remarks | Sale | 14,952 | $1.63 | $24356.81 |
| 2026-02-17 | VAN, OENE MARK | See Remarks | Sale | 129,790 | $1.58 | $204549.04 |
| 2026-02-17 | HENRY, CHRISTIAN O | See Remarks | Sale | 331,793 | $1.58 | $522905.77 |
| 2026-02-17 | FARMER, MICHELE | See Remarks | Sale | 35,215 | $1.58 | $55498.84 |
| 2025-08-18 | VAN, OENE MARK | See Remarks | Sale | 26,836 | $1.31 | $35182.00 |
| 2025-06-04 | VALANTINE, HANNAH | Director | Buy | 65,000 | — | — |
| 2025-06-04 | SMITH, CHRISTOPHER M | Director | Buy | 32,500 | — | — |
| 2025-06-04 | SHAPIRO, LUCY | Director | Buy | 65,000 | — | — |
| 2025-06-04 | ORDONEZ, KATHY | Director | Buy | 65,000 | — | — |
| 2025-06-04 | MOHR, MARSHALL | Director | Buy | 65,000 | — | — |
| 2025-06-04 | MILLIGAN, JOHN F | Director | Buy | 65,000 | — | — |
| 2025-06-04 | LIVINGSTON, RANDALL S | Director | Buy | 65,000 | — | — |
| 2025-06-04 | ERICSON, WILLIAM W. | Director | Buy | 65,000 | — | — |
| 2025-05-19 | FARMER, MICHELE | See Remarks | Sale | 5,195 | $1.00 | $5200.19 |
| 2025-03-31 | GIBSON, JAMES R II | See Remarks | Buy | 2,000,000 | — | — |
| 2025-03-31 | GIBSON, JAMES R II | See Remarks | Buy | 1,000,000 | — | — |
| 2025-03-19 | VAN, OENE MARK | See Remarks | Buy | 898,352 | — | — |
| 2025-03-19 | VAN, OENE MARK | See Remarks | Buy | 449,176 | — | — |
| 2025-03-19 | HENRY, CHRISTIAN O | See Remarks | Buy | 1,841,621 | — | — |
| 2025-03-19 | HENRY, CHRISTIAN O | See Remarks | Buy | 920,810 | — | — |
| 2025-03-19 | FARMER, MICHELE | See Remarks | Buy | 179,670 | — | — |
| 2025-03-19 | FARMER, MICHELE | See Remarks | Buy | 89,835 | — | — |
| 2025-03-03 | VAN, OENE MARK | See Remarks | Sale | 6,486 | $1.41 | $9125.80 |
| 2025-03-03 | HENRY, CHRISTIAN O | See Remarks | Sale | 12,497 | $1.41 | $17583.28 |
| 2025-03-03 | FARMER, MICHELE | See Remarks | Sale | 2,973 | $1.41 | $4183.01 |
| 2025-02-18 | VAN, OENE MARK | See Remarks | Sale | 100,773 | $1.88 | $189251.69 |
| 2025-02-18 | HENRY, CHRISTIAN O | See Remarks | Sale | 259,909 | $1.88 | $488109.10 |
| 2025-02-18 | FARMER, MICHELE | See Remarks | Sale | 24,349 | $1.88 | $45727.42 |
| 2025-01-30 | SMITH, CHRISTOPHER M | Director | Buy | 72,901 | — | — |
| 2025-01-30 | SMITH, CHRISTOPHER M | Director | Buy | 54,099 | — | — |
| 2025-01-10 | VAN, OENE MARK | See Remarks | Sale | 34,405 | $2.03 | $69979.77 |
| 2024-09-30 | KIM, SUSAN G. | See Remarks | Sale | 19,782 | $1.72 | $34064.60 |
| 2024-09-16 | HENRY, CHRISTIAN O | See Remarks | Sale | 98,907 | $1.75 | $172691.62 |
| 2024-08-19 | EIDEL, JEFF | See Remarks | Sale | 26,760 | $1.59 | $42601.92 |
| 2024-08-16 | VAN, OENE MARK | See Remarks | Sale | 38,011 | $1.66 | $63174.28 |
| 2024-06-18 | VALANTINE, HANNAH | Director | Buy | 32,179 | — | — |
| 2024-06-18 | VALANTINE, HANNAH | Director | Buy | 22,821 | — | — |
| 2024-06-18 | SHAPIRO, LUCY | Director | Buy | 32,179 | — | — |
| 2024-06-18 | SHAPIRO, LUCY | Director | Buy | 22,821 | — | — |
| 2024-06-18 | ORDONEZ, KATHY | Director | Buy | 32,179 | — | — |
| 2024-06-18 | ORDONEZ, KATHY | Director | Buy | 22,821 | — | — |
| 2024-06-18 | MOHR, MARSHALL | Director | Buy | 32,179 | — | — |
| 2024-06-18 | MOHR, MARSHALL | Director | Buy | 22,821 | — | — |
| 2024-06-18 | MILLIGAN, JOHN F | Director | Buy | 32,179 | — | — |
| 2024-06-18 | MILLIGAN, JOHN F | Director | Buy | 22,821 | — | — |
| 2024-06-18 | MELINE, DAVID W | Director | Buy | 24,134 | — | — |
| 2024-06-18 | MELINE, DAVID W | Director | Buy | 17,116 | — | — |
| 2024-06-18 | LIVINGSTON, RANDALL S | Director | Buy | 32,179 | — | — |
| 2024-06-18 | LIVINGSTON, RANDALL S | Director | Buy | 22,821 | — | — |
| 2024-06-18 | ERICSON, WILLIAM W. | Director | Buy | 32,179 | — | — |
| 2024-06-18 | ERICSON, WILLIAM W. | Director | Buy | 22,821 | — | — |
| 2024-05-20 | FARMER, MICHELE | See Remarks | Sale | 5,275 | $2.03 | $10708.25 |
| 2024-03-15 | ORDONEZ, KATHY | Director | Sale | 324,515 | — | — |
| 2024-03-15 | ORDONEZ, KATHY | Director | Sale | 37,106 | — | — |
| 2024-03-15 | ORDONEZ, KATHY | Director | Buy | 324,515 | $2.90 | $941093.50 |
| 2024-03-15 | ORDONEZ, KATHY | Director | Buy | 37,106 | $2.63 | $97588.78 |
| 2024-03-06 | MELINE, DAVID W | Director | Buy | 40,000 | $4.40 | $176160.00 |
| 2024-03-04 | VAN, OENE MARK | See Remarks | Sale | 9,186 | $4.87 | $44745.01 |
| 2024-03-04 | KIM, SUSAN G. | See Remarks | Sale | 5,275 | $4.87 | $25694.53 |
| 2024-03-04 | HENRY, CHRISTIAN O | See Remarks | Sale | 14,177 | $4.87 | $69056.17 |
| 2024-03-04 | FARMER, MICHELE | See Remarks | Sale | 2,968 | $4.87 | $14457.13 |
| 2024-03-01 | MOHR, MARSHALL | Director | Sale | 25,000 | — | — |
| 2024-03-01 | MOHR, MARSHALL | Director | Buy | 25,000 | $4.45 | $111250.00 |
| 2024-02-22 | VAN, OENE MARK | See Remarks | Buy | 798,076 | — | — |
| 2024-02-22 | KIM, SUSAN G. | See Remarks | Buy | 432,692 | — | — |
| 2024-02-22 | HENRY, CHRISTIAN O | See Remarks | Buy | 1,605,769 | — | — |
| 2024-02-22 | FARMER, MICHELE | See Remarks | Buy | 115,384 | — | — |
| 2024-02-22 | EIDEL, JEFF | See Remarks | Buy | 461,538 | — | — |
Frequently asked questions
Are PACB insiders buying or selling?
Over the transactions on record, PACB insiders have been net buyers, with about $2.65M in stock sold across 32 sales, against 4 open-market purchases.
Does insider selling at PACB mean the stock will fall?
Not by itself. Most executive selling is pre-scheduled through 10b5-1 plans filed months in advance, and insiders sell for diversification, taxes, and liquidity far more often than out of any view on the price. Insider buying is the stronger signal, especially when several insiders buy around the same time, because there is usually only one reason to put personal cash into the stock.
Which PACB insiders are selling the most?
Recent selling is concentrated in a few names. HENRY, CHRISTIAN O accounts for the largest share on record, with about $1.52M sold. Selling by one or two individuals matters less than broad selling across the whole leadership team, which is the pattern worth watching.