Pacific Biosciences of California, Inc. PACB NASDAQ

NASDAQ Global Select • Healthcare • Medical - Devices • US • USD

SharesGrow Score

41/100

2/7 Pass

SharesGrow Intrinsic Value

Pacific Biosciences of California, Inc. (PACB) has 20 known insider and institutional holders on record. The largest holder is HENRY CHRISTIAN O with 3,581,813 shares. Other notable holders include Van Oene Mark and Gibson James R II.

Over the last 12 months, insiders have made 26 transactions in PACB stock — 13 buys (valued at $6.7M) and 12 sells (valued at $1.32M). Insider buying has outpaced selling during this period, which may signal confidence in the company's prospects.

PACB Insider Ownership

Top Holder

HENRY CHRISTIAN O

3,581,813 shares

Buys (12 mo)

$6.7M value

Sells (12 mo)

$1.32M value

12-Month Transaction Activity

Buy 50%

Sell 46%

Top Insider Holders

#	Name	Role	Shares Owned	Last Filed	Relative Size
1	Henry Christian O	See Remarks	3,581,813	2026-03-04	100%
2	Van Oene Mark	See Remarks	2,243,634	2026-03-04	63%
3	Gibson James R Ii	See Remarks	1,245,663	2026-04-03	35%
4	Turner Stephen W	VP & Chief Technology Officer	1,093,063	2011-07-11	31%
5	Barnes Susan K	EVP, CFO and Pao	874,812	2020-02-25	24%
6	Eidel Jeff	See Remarks	869,730	2024-08-20	24%
7	Kim Susan G.	See Remarks	695,654	2024-10-02	19%
8	Martin Hugh C	Director	342,458	2012-02-07	10%
9	Farmer Michele	See Remarks	305,948	2026-03-04	9%
10	Phillips James Michael	SVP, Research & Development	249,220	2020-03-24	7%
11	Fromen Peter	See Remarks	190,280	2022-03-04	5%
12	Glynn Michael	Chief Commercial Officer	100,000	2012-02-17	3%
13	Schaefer Eric	Chief Accounting Officer	88,474	2021-02-24	2%
14	Milligan John F	Director	65,000	2025-06-06	2%
15	Livingston Randall S	Director	65,000	2025-06-06	2%
16	Shapiro Lucy	Director	65,000	2025-06-06	2%
17	Ordonez Kathy	Director	65,000	2025-06-06	2%
18	Valantine Hannah	Director	65,000	2025-06-06	2%
19	Ericson William W.	Director	65,000	2025-06-06	2%
20	Mohr Marshall	Director	65,000	2025-06-06	2%

Recent Transactions (last 12 months)

Date	Name	Role	Type	Shares	Price	Value
2026-04-01	Gibson James R Ii	See Remarks	Informative Sell	88,185	$1.37	$120.81K
2026-03-03	Gibson Christopher	Director	RSU Award	53,913	-	-
2026-03-03	Gibson Christopher	Director	Unknown	-	-	-
2026-03-03	Farmer Michele	See Remarks	Informative Sell	2,979	$1.51	$4.51K
2026-03-03	Van Oene Mark	See Remarks	Informative Sell	6,504	$1.51	$9.85K
2026-03-03	Henry Christian O	See Remarks	Informative Sell	12,497	$1.51	$18.92K
2026-02-27	Farmer Michele	See Remarks	RSU Award	179,670	$1.68	$301.85K
2026-02-27	Van Oene Mark	See Remarks	RSU Award	1,000,000	$1.68	$1.68M
2026-02-27	Gibson James R Ii	See Remarks	RSU Award	667,696	$1.68	$1.12M
2026-02-27	Henry Christian O	See Remarks	RSU Award	1,841,621	$1.68	$3.09M
2026-02-18	Farmer Michele	See Remarks	Informative Sell	14,952	$1.63	$24.36K
2026-02-17	Farmer Michele	See Remarks	Informative Sell	35,215	$1.58	$55.5K
2026-02-18	Van Oene Mark	See Remarks	Informative Sell	55,107	$1.63	$89.77K
2026-02-17	Van Oene Mark	See Remarks	Informative Sell	129,790	$1.58	$204.55K
2026-02-18	Henry Christian O	See Remarks	Informative Sell	140,874	$1.63	$229.48K
2026-02-17	Henry Christian O	See Remarks	Informative Sell	331,793	$1.58	$522.91K
2025-08-18	Van Oene Mark	See Remarks	Informative Sell	26,836	$1.31	$35.18K
2025-06-04	Valantine Hannah	Director	RSU Award	65,000	$1.03	$66.95K
2025-06-04	Ericson William W.	Director	RSU Award	65,000	$1.03	$66.95K
2025-06-04	Smith Christopher M	Director	RSU Award	32,500	$1.03	$33.48K
2025-06-04	Shapiro Lucy	Director	RSU Award	65,000	$1.03	$66.95K
2025-06-04	Mohr Marshall	Director	RSU Award	65,000	$1.03	$66.95K
2025-06-04	Livingston Randall S	Director	RSU Award	65,000	$1.03	$66.95K
2025-06-04	Ordonez Kathy	Director	RSU Award	65,000	$1.03	$66.95K
2025-06-04	Milligan John F	Director	RSU Award	65,000	$1.03	$66.95K