Pacific Biosciences of California, Inc. (PACB) Ownership
PACB ownership summary
as of October 18, 2026- Institutions
- 55.4% of shares outstanding
- Insiders
- 8.86% of shares outstanding
- Shares outstanding
- 310.8M
- Float
- 304.2M shares available to trade
- Short interest
- 17.46% 47.2M shares short
- Days to cover
- 4.51 short interest down 3.4% vs prior month
- Institutions 55.43%
- Insiders 8.86%
- Other investors 35.71%
PACB top institutional holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | BlackRock Inc | 10.40% | 32.3M | $55.9M | +7.1M (+28.0%) | June 30, 2026 |
| 2 | ARK Investment Management LLC | 9.58% | 29.8M | $51.5M | −6.5M (−17.9%) | June 30, 2026 |
| 3 | SoftBank Group Corp | 6.58% | 20.5M | $35.4M | — | June 30, 2026 |
| 4 | Vanguard Capital Management, LLC | 4.31% | 13.4M | $23.2M | +620,485 (+4.9%) | June 30, 2026 |
| 5 | Geode Capital Management, LLC | 2.45% | 7.6M | $13.2M | +631,252 (+9.0%) | June 30, 2026 |
| 6 | Amova Asset Management Americas, Inc | 1.93% | 6.0M | $10.4M | −1.0M (−14.6%) | June 30, 2026 |
| 7 | Sumitomo Mitsui Trust Group Inc | 1.93% | 6.0M | $10.4M | −1.0M (−14.6%) | June 30, 2026 |
| 8 | State Street Corp | 1.92% | 6.0M | $10.3M | −160,541 (−2.6%) | June 30, 2026 |
| 9 | Point72 Asset Management, L.P. | 1.54% | 4.8M | $8.3M | +4.5M (+1,575.6%) | June 30, 2026 |
| 10 | Two Sigma Investments LLC | 1.36% | 4.2M | $7.3M | +732,986 (+20.9%) | June 30, 2026 |
| 11 | D. E. Shaw & Co LP | 1.35% | 4.2M | $7.3M | +570,599 (+15.7%) | June 30, 2026 |
| 12 | Millennium Management LLC | 1.27% | 4.0M | $6.9M | −929,876 (−19.0%) | June 30, 2026 |
| 13 | The Goldman Sachs Group Inc | 1.04% | 3.2M | $5.6M | +2.2M (+226.8%) | June 30, 2026 |
| 14 | Citadel Advisors Llc | 0.92% | 2.8M | $4.9M | +1.3M (+80.6%) | June 30, 2026 |
| 15 | Vanguard Portfolio Management, LLC | 0.86% | 2.7M | $4.6M | −196,477 (−6.8%) | June 30, 2026 |
| 16 | Charles Schwab Investment Management Inc | 0.85% | 2.7M | $4.6M | +246,802 (+10.3%) | June 30, 2026 |
| 17 | Northern Trust Corp | 0.76% | 2.4M | $4.1M | +221,998 (+10.4%) | June 30, 2026 |
| 18 | Vanguard Fiduciary Trust Co | 0.70% | 2.2M | $3.8M | +201,144 (+10.1%) | June 30, 2026 |
| 19 | Susquehanna International Group, LLP | 0.69% | 2.1M | $3.7M | +410,098 (+23.9%) | June 30, 2026 |
| 20 | Longaeva Partners L.P. | 0.68% | 2.1M | $3.7M | +2.1M (0.0%) | June 30, 2026 |
Value at the latest close. Change = shares bought or sold in the latest quarterly filing (13F). In the top 20, 13 holders added 20.8M shares and 6 cut 9.8M.
PACB top mutual fund and ETF holders
20 largest| # | Holder | % of shares | Shares | Value | Change | Reported |
|---|---|---|---|---|---|---|
| 1 | ARK Innovation ETF | 4.69% | 14.6M | $25.2M | −1.1M (−7.3%) | September 30, 2026 |
| 2 | ARK Genomic Revolution ETF | 3.47% | 10.8M | $18.6M | +26,344 (+0.2%) | September 30, 2026 |
| 3 | Vanguard MStar Total Stk Mkt Idx Invest | 3.07% | 9.5M | $16.5M | — | August 31, 2026 |
| 4 | iShares Russell 2000 ETF | 2.38% | 7.4M | $12.8M | −85,184 (−1.1%) | September 30, 2026 |
| 5 | T. Rowe Price New Horizons | 1.52% | 4.7M | $8.2M | +4.7M (0.0%) | September 30, 2026 |
| 6 | Fidelity Small Cap Index | 0.98% | 3.1M | $5.3M | +3,548 (+0.1%) | July 31, 2026 |
| 7 | Amova ARK Pstv Chg Innovt P JPY Acc | 0.96% | 3.0M | $5.2M | −201,658 (−6.3%) | August 31, 2026 |
| 8 | BlackRock Advantage Small Cap Core Instl | 0.83% | 2.6M | $4.4M | — | August 31, 2026 |
| 9 | iShares Russell 2000 Growth ETF | 0.80% | 2.5M | $4.3M | −3,159 (−0.1%) | September 30, 2026 |
| 10 | iShares Biotechnology ETF | 0.73% | 2.3M | $3.9M | −17,208 (−0.8%) | September 30, 2026 |
| 11 | Amova ARK Disruptive Innovation A USD | 0.55% | 1.7M | $3.0M | — | August 31, 2026 |
| 12 | Vanguard Russell 2000 ETF | 0.54% | 1.7M | $2.9M | +68,171 (+4.2%) | September 30, 2026 |
| 13 | Fidelity Extended Market Index | 0.53% | 1.6M | $2.8M | +496,334 (+43.2%) | August 31, 2026 |
| 14 | Schwab US Small-Cap ETF™ | 0.52% | 1.6M | $2.8M | +1,089 (+0.1%) | September 30, 2026 |
| 15 | ARK Venture D | 0.44% | 1.4M | $2.4M | +806,876 (+143.9%) | April 30, 2026 |
| 16 | Invesco RAFI US 1500 Small-Mid ETF | 0.32% | 1.0M | $1.7M | — | September 30, 2026 |
| 17 | Vanguard Health Care ETF | 0.25% | 769K | $1.3M | +821 (+0.1%) | September 30, 2026 |
| 18 | iShares Genomics Immnlgy & Hlthcr ETF | 0.25% | 764K | $1.3M | +21,084 (+2.8%) | September 30, 2026 |
| 19 | Schwab Small Cap Index | 0.22% | 685K | $1.2M | — | August 31, 2026 |
| 20 | ARK Genomic Revolution ETF A USD Acc | 0.21% | 654K | $1.1M | — | September 30, 2026 |
Funds report holdings monthly or quarterly; dates differ by fund.
PACB insider transactions
latest 9| Date | Name | Transaction | Price | Shares | Value |
|---|---|---|---|---|---|
| 2026-03-03 | Christian O Henry | Sell | $1.51 | 12,497 | $18,870 |
| 2026-03-03 | Michele Farmer | Sell | $1.51 | 2,979 | $4,498 |
| 2026-03-03 | Oene Mark Van | Sell | $1.51 | 6,504 | $9,821 |
| 2026-02-18 | Christian O Henry | Sell | $1.63 | 140,874 | $229,625 |
| 2026-02-18 | Michele Farmer | Sell | $1.63 | 14,952 | $24,372 |
| 2026-02-18 | Oene Mark Van | Sell | $1.63 | 55,107 | $89,824 |
| 2026-02-17 | Christian O Henry | Sell | $1.58 | 331,793 | $524,233 |
| 2026-02-17 | Michele Farmer | Sell | $1.58 | 35,215 | $55,640 |
| 2026-02-17 | Oene Mark Van | Sell | $1.58 | 129,790 | $205,068 |
Reported trades by company officers, directors and other filers (including disclosures by members of Congress where EODHD lists them). "—" where the filing gives no share count.
PACB shares outstanding
Year-end shares outstanding, adjusted for splits.
Who owns PACB
Institutional investors own 55.4% of PacBio's shares and insiders 8.86%. The largest holder is BlackRock Inc with 10.40% of the shares (32.3M), as of June 30, 2026. Among the top 20 institutions, 13 added shares and 6 reduced their stake in the latest filings. Short interest is 17.46% of the float, or 4.51 days of average trading volume. The share count rose 315.1% since 2014.
Related: PACB analyst forecast, PACB key metrics. See the PACB stock overview for the latest quote and news.
PACB ownership FAQ
Who owns the most PacBio stock?
The largest shareholders of PacBio are BlackRock Inc (10.40%), ARK Investment Management LLC (9.58%), SoftBank Group Corp (6.58%), Vanguard Capital Management, LLC (4.31%), Geode Capital Management, LLC (2.45%).
What percentage of PacBio is owned by institutions?
Institutions hold 55.4% of PacBio's shares outstanding; insiders hold 8.86%.
Which funds own PacBio?
The largest fund holders of PacBio are ARK Innovation ETF (4.69%), ARK Genomic Revolution ETF (3.47%), Vanguard MStar Total Stk Mkt Idx Invest (3.07%), iShares Russell 2000 ETF (2.38%), T. Rowe Price New Horizons (1.52%).
What is PacBio's short interest?
47.2M shares of PacBio were sold short, 17.46% of the float; at the average daily volume it would take 4.51 days to cover.
Are insiders buying or selling PacBio?
Of the latest 9 reported insider transactions in PacBio (since February 17, 2026), 0 were purchases and 9 were sales.
How many shares of PacBio are outstanding?
PacBio has 310.8M shares outstanding, of which 304.2M are in the public float.