Pacific Biosciences of California, Inc.
Pacific Biosciences of California, Inc. (PACB) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · PACB · as of Sep 30, 2025
Ownership Breakdown
217
Institutional Holders
▲ 1 vs Q2
$237.85M
Total Inst. Value
▼ $8.00M vs Q2
310.60M
Shares Outstanding
freeFloat 97.69%
186.22M
13F Shares Held
▼ 12.24M vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
PACB largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
ARK INVESTMENT MANAGEMENT LLC laboratory analytical instruments | 30.92M | 10.30% | 10.30% | $39.58B | Nov 12, 2025 | ▼ 5.37M |
BLACKROCK, INC. laboratory analytical instruments | 22.70M | 7.56% | 7.56% | $29.05B | Nov 12, 2025 | ▲ 42.9K |
SOFTBANK GROUP CORP. laboratory analytical instruments | 20.45M | 6.81% | 6.81% | $26.18B | Nov 14, 2025 | — held |
VANGUARD GROUP INC laboratory analytical instruments | 16.38M | 5.46% | 5.46% | $20.97B | Nov 7, 2025 | ▲ 362.8K |
EDMOND DE ROTHSCHILD HOLDING S.A. laboratory analytical instruments | 10.68M | 3.56% | 3.56% | $13.66B | Nov 13, 2025 | ▼ 2.69M |
SUMITOMO MITSUI TRUST HOLDINGS, INC. laboratory analytical instruments | 8.68M | 2.89% | 2.89% | $11.11B | Oct 27, 2025 | ▼ 540.9K |
NIKKO ASSET MANAGEMENT AMERICAS, INC. laboratory analytical instruments | 8.68M | 2.89% | 2.89% | $11.02B | Nov 12, 2025 | ▼ 540.9K |
GEODE CAPITAL MANAGEMENT, LLC laboratory analytical instruments | 6.91M | 2.30% | 2.30% | $8.84B | Nov 12, 2025 | ▲ 187.8K |
STATE STREET CORP laboratory analytical instruments | 5.91M | 1.97% | 1.97% | $7.56B | Nov 14, 2025 | ▲ 155.1K |
MADRONE ADVISORS, LLC laboratory analytical instruments | 4.98M | 1.66% | 1.66% | $6.37B | Nov 14, 2025 | ▼ 11.79M |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
25
Increased
+13.83M shares1
New Positions
first time holders15
Decreased
−22.85M shares0
Sold Out
fully exitedNet shares change (top 50)
9.02M
+13.83M / −22.85M
Net new holders
+11
1 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
PACB insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
10
Buy transactions
1
Sell transactions
10.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
MOHR MARSHALL director | Jun 3, 2026 | Award | 223,492 | $1.58 | $353.1K | 223.5K | Form 4 ↗ |
Gibson Christopher director | Jun 3, 2026 | Award | 74,497 | $1.58 | $117.7K | 74.5K | Form 4 ↗ |
Smith Christopher M director | Jun 3, 2026 | Award | 223,492 | $1.58 | $353.1K | 223.5K | Form 4 ↗ |
Valantine Hannah director | Jun 3, 2026 | Award | 223,492 | $1.58 | $353.1K | 223.5K | Form 4 ↗ |
LIVINGSTON RANDALL S director | Jun 3, 2026 | Award | 223,492 | $1.58 | $353.1K | 223.5K | Form 4 ↗ |
Ericson William W. director | Jun 3, 2026 | Award | 223,492 | $1.58 | $353.1K | 223.5K | Form 4 ↗ |
MILLIGAN JOHN F director | Jun 3, 2026 | Award | 223,492 | $1.58 | $353.1K | 223.5K | Form 4 ↗ |
ORDONEZ KATHY director | Jun 3, 2026 | Award | 223,492 | $1.58 | $353.1K | 223.5K | Form 4 ↗ |
Gibson Christopher director | Apr 8, 2026 | Award | 57,473 | — | — | 111.4K | Form 4 ↗ |
Gibson Christopher director | Apr 8, 2026 | Award | 77,842 | $1.52 | $118.3K | 77.8K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Pacific Biosciences of California, Inc. (PACB) is primarily owned by institutional investors, who hold approximately 60.0% of total shares outstanding. Company insiders own approximately 2.31%, while retail and public investors account for the remaining 37.74%.
The largest institutional shareholder of Pacific Biosciences of California, Inc. is ARK INVESTMENT MANAGEMENT LLC, holding approximately 30.92 million shares — equal to 10.30% of outstanding shares — as of September 30, 2025.
A total of 217 institutional investors currently hold PACB stock, with a combined institutional value of approximately $237,846,661 as of the most recent 13F filing period.
Frequently asked questions
PACB ownershipPacific Biosciences of California, Inc. (PACB) is primarily owned by institutional investors, who hold approximately 60.0% of shares. The largest shareholder is ARK INVESTMENT MANAGEMENT LLC with a 10.30% stake. Company insiders hold 2.31%. Data sourced from SEC Form 13F as of September 30, 2025.