Pacific Biosciences Of Calif
$1.73-11.7%
+$14.6M
Net Activity
+2.83% total shares
Institutions Holding
225
Popularity Rank
#2732
Avg Weight
0.02%
Total Value
$330.9M
Market Cap
$518.9M
225 institutions currently hold PACB, with 100 net buyers and 108 net sellers this quarter.
Institutional Moves (Q2 2026)
Neutral
Based on recent trading activity
Net Selling Institutions
108
Net Buying Institutions
100
Top 5 by Value
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Across its top 20 institutional holders, PACB's holder base skews toward low-concentration, low-turnover investors on average (avg. concentration score 10/100, avg. turnover score 44/100).
PACB ranks #2732 out of 37696 tracked stocks by institutional interest — one of the most closely watched names in our coverage.
PACB is a disclosed holding of Cathie Wood (ARK Investment Management), one of the tracked superinvestors on AlphaSMO — it makes up 0.3% of that fund's own 13F portfolio.
225 institutions disclose a position in PACB, but none treat it as a major bet — even Birchview Capital, LP, its most concentrated holder, allocates just 1.1% of its own portfolio to it.
AdvisorNet Financial, Inc has added to its PACB position for two straight quarters, increasing it by $167.3K to reach $354.8K today.
PACB is down 11.7% today, but institutions show net buying of $14.6M this quarter — a divergence between today's price move and the underlying institutional flow.
PACB reported a net loss of $131.4M over the trailing twelve months.
+$51.8M
Total Buy Value
$37.3M
Total Sell Value
100
Net Buyers
108
Net Sellers
PACB
Q2 2026
Top 5 Institutional Movers
PACB does not currently have enough recent insider (Form 4) trading activity to compute a convergence signal against its 13F institutional flows.
13F data as of 2026-09-30 quarterly filings. Note: many large institutions file close to the 45-day post-quarter deadline, so early-quarter flow figures can shift substantially as more filings arrive.
2
Filings (90d)
$1.93M
Total Est. Value
689K shares
Planned Shares
| Filer | Filing Date | Est. Value |
|---|---|---|
| Jim Gibson | 2026-10-06 | $1.90M |
| MARK VAN OENE | 2026-08-17 | $31K |
Form 144 is a planned sale notice, not an executed transaction. Form 144 Tracker。
1
Active 5%+ Holders
| Reporting Person | Type | Filing Date | % of Class |
|---|---|---|---|
| ARK Investment Management LLC | 13G/A | 2026-08-14 | 9.6% |
1
Filings (14d)
Pacific Biosciences of California (PACB) announced its second-quarter 2026 financial results (for the quarter ended June 30, 2026) on August 5, 2026, and attached the press release as an exhibit to this 8-K. This filing only states that the results were announced – it doesn't include any actual numbers or commentary. It also lists other items (2.05, 5.02, etc.) but those details aren't shown in the excerpt.
View Full Filing (SEC EDGAR)69404D108
The most-added stocks by 13F institutions this quarter
Institutions Holding
6,278
Total reported value
$2.2T
3254 13F institutions increased their position this quarter
Institutions Holding
6,025
Total reported value
$3.6T
3054 13F institutions increased their position this quarter
Institutions Holding
6,188
Total reported value
$1.8T
2995 13F institutions increased their position this quarter
The most widely held stocks tracked across all 13F institutions
Institutions Holding
5,283
Total reported value
$1.3T
Held by 5283 institutions — one of the most-tracked stocks on AlphaSMO
Institutions Holding
5,174
Total reported value
$671.0B
Held by 5174 institutions — one of the most-tracked stocks on AlphaSMO
Institutions Holding
5,106
Total reported value
$1.1T
Held by 5106 institutions — one of the most-tracked stocks on AlphaSMO
Access PACB's institutional ownership data programmatically:
REST API
curl https://alphasmo.com/api/v1/market/stock/PACBCLI
npx alphasmo stocks get PACB