Who owns Pacific Biosciences of California, Inc. (PACB)
Which tracked institutional funds hold PACB, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See PACB company fundamentals →
Ownership as of the 2026-Q1 13F filings (latest filed 2026-05-18). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
The tracked-fund tape on PACB is one-sided between 2025-Q4 and 2026-Q1: 12 added or opened and 49 trimmed or exited — on balance reducing.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
PACB’s largest tracked holder by dollar value, ARK Investment Management LLC, sizes it at 0.4% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.4pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in PACB divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2025-Q4 and 2026-Q1, across 230 tracked filers holding PACB, 111 increased or opened the position and 109 reduced or closed it; over the same quarter, open-market insider Form 4 buying and selling roughly offset.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in PACB between the 2025-Q4 and 2026-Q1 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 7
- VANGUARD CAPITAL MANAGEMENT LLC$17M
- VANGUARD PORTFOLIO MANAGEMENT LLC$4M
- VANGUARD FIDUCIARY TRUST CO$3M
- Qube Research & Technologies Ltd$2M
- TUDOR INVESTMENT CORP ET AL$904K
- PEAK6 LLC$791K
Full exits 6
- VANGUARD GROUP INC$28M
- Koss-Olinger Consulting, LLC$5M
- AMIRAL GESTION$3M
- TWO SIGMA ADVISERS, LP$2M
- Headlands Technologies LLC$1M
- Squarepoint Ops LLC$839K
Largest adds
- Nuveen, LLC$2M
- Birchview Capital, LP$1M
- AQR CAPITAL MANAGEMENT LLC$757K
- DIMENSIONAL FUND ADVISORS LP$583K
- Russell Investments Group, Ltd.$576K
Largest trims
- ARK Investment Management LLC$22M
- SOFTBANK GROUP CORP.$11M
- BlackRock, Inc.$10M
- Casdin Capital, LLC$7M
- Amova Asset Management Americas, Inc.$5M
- Sumitomo Mitsui Trust Group, Inc.$5M
Institutional holders
One row per tracked fund, largest reported value first. “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding. Rows marked stale are from an earlier filing than the security’s latest quarter — that fund is absent from the newest snapshot (position exited, or reported under a different name).
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| ARK Investment Management LLC trimmed | 36,273,288 | $48M | 14.8% | 2026-Q1 |
| BlackRock, Inc. added | 25,267,429 | $33M | 10.3% | 2026-Q1 |
| SOFTBANK GROUP CORP. | 20,451,570 | $27M | 8.4% | 2026-Q1 |
| VANGUARD CAPITAL MANAGEMENT LLC new | 12,777,449 | $17M | 5.2% | 2026-Q1 |
| Sumitomo Mitsui Trust Group, Inc. trimmed | 7,037,987 | $9M | 2.9% | 2026-Q1 |
| Amova Asset Management Americas, Inc. trimmed | 7,037,987 | $9M | 2.9% | 2026-Q1 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 6,975,266 | $9M | 2.9% | 2026-Q1 |
| STATE STREET CORP added | 6,121,716 | $8M | 2.5% | 2026-Q1 |
| MILLENNIUM MANAGEMENT LLC added | 4,892,318 | $6M | 2.0% | 2026-Q1 |
| D. E. Shaw & Co., Inc. trimmed | 3,637,547 | $5M | 1.5% | 2026-Q1 |
| TWO SIGMA INVESTMENTS, LP added | 3,509,613 | $5M | 1.4% | 2026-Q1 |
| Nuveen, LLC added | 2,950,929 | $4M | 1.2% | 2026-Q1 |
| VANGUARD PORTFOLIO MANAGEMENT LLC new | 2,868,393 | $4M | 1.2% | 2026-Q1 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 2,489,100 | $3M | 1.0% | 2026-Q1 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 2,405,496 | $3M | 1.0% | 2026-Q1 |
| NORTHERN TRUST CORP added | 2,130,788 | $3M | 0.9% | 2026-Q1 |
| VANGUARD FIDUCIARY TRUST CO new | 1,986,483 | $3M | 0.8% | 2026-Q1 |
| MORGAN STANLEY trimmed | 1,840,461 | $2M | 0.8% | 2026-Q1 |
| IQ EQ FUND MANAGEMENT (IRELAND) Ltd trimmed | 1,788,393 | $2M | 0.7% | 2026-Q1 |
| SUSQUEHANNA INTERNATIONAL GROUP, LLP trimmed | 1,719,165 | $2M | 0.7% | 2026-Q1 |
| BANK OF AMERICA CORP /DE/ trimmed | 1,666,706 | $2M | 0.7% | 2026-Q1 |
| UBS Group AG trimmed | 1,640,099 | $2M | 0.7% | 2026-Q1 |
| CITADEL ADVISORS LLC trimmed | 1,576,051 | $2M | 0.6% | 2026-Q1 |
| Birchview Capital, LP added | 1,500,000 | $2M | 0.6% | 2026-Q1 |
| Invesco Ltd. added | 1,468,148 | $2M | 0.6% | 2026-Q1 |
| JANE STREET GROUP, LLC trimmed | 1,390,070 | $2M | 0.6% | 2026-Q1 |
| HRT FINANCIAL LP trimmed | 1,265,535 | $2M | 0.5% | 2026-Q1 |
| Qube Research & Technologies Ltd trimmed | 1,184,975 | $2M | 0.5% | 2026-Q1 |
| GOLDMAN SACHS GROUP INC trimmed | 988,467 | $1M | 0.4% | 2026-Q1 |
| BOURNE LENT ASSET MANAGEMENT INC trimmed | 951,055 | $1M | 0.4% | 2026-Q1 |
| HHLR ADVISORS, LTD. | 918,892 | $1M | 0.4% | 2026-Q1 |
| DIMENSIONAL FUND ADVISORS LP added | 899,550 | $1M | 0.4% | 2026-Q1 |
| Bank of New York Mellon Corp trimmed | 813,406 | $1M | 0.3% | 2026-Q1 |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 808,700 | $1M | 0.3% | 2026-Q1 |
| Casdin Capital, LLC trimmed | 723,767 | $955K | 0.3% | 2026-Q1 |
| AQR CAPITAL MANAGEMENT LLC added | 696,484 | $919K | 0.3% | 2026-Q1 |
| TUDOR INVESTMENT CORP ET AL added | 684,707 | $904K | 0.3% | 2026-Q1 |
| Mirador Capital Partners LP added | 604,884 | $798K | 0.2% | 2026-Q1 |
| PEAK6 LLC trimmed | 599,022 | $791K | 0.2% | 2026-Q1 |
| CARRET ASSET MANAGEMENT, LLC added | 559,140 | $738K | 0.2% | 2026-Q1 |
| Vestmark Advisory Solutions, Inc. trimmed | 550,089 | $726K | 0.2% | 2026-Q1 |
| ALLIANCEBERNSTEIN L.P. | 387,060 | $724K | 0.2% | 2026-Q1 |
| PANAGORA ASSET MANAGEMENT INC added | 502,663 | $664K | 0.2% | 2026-Q1 |
| Russell Investments Group, Ltd. added | 469,875 | $620K | 0.2% | 2026-Q1 |
| ArrowMark Colorado Holdings LLC | 468,382 | $618K | 0.2% | 2026-Q1 |
| ACADIAN ASSET MANAGEMENT LLC trimmed | 418,791 | $549K | 0.2% | 2026-Q1 |
| GROUP ONE TRADING LLC trimmed | 365,021 | $482K | 0.1% | 2026-Q1 |
| CAXTON ASSOCIATES LLP trimmed | 353,130 | $466K | 0.1% | 2026-Q1 |
| RHUMBLINE ADVISERS trimmed | 348,942 | $461K | 0.1% | 2026-Q1 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 336,257 | $444K | 0.1% | 2026-Q1 |
| Creative Planning trimmed | 327,360 | $432K | 0.1% | 2026-Q1 |
| LPL Financial LLC added | 299,597 | $395K | 0.1% | 2026-Q1 |
| Point72 Asset Management, L.P. trimmed | 285,700 | $377K | 0.1% | 2026-Q1 |
| HIMENSION CAPITAL (SINGAPORE) PTE. LTD. new | 276,532 | $365K | 0.1% | 2026-Q1 |
| WATER ISLAND CAPITAL LLC added | 272,040 | $359K | 0.1% | 2026-Q1 |
| EverSource Wealth Advisors, LLC added | 17,877 | $354K | 0.1% | 2026-Q1 |
| BALYASNY ASSET MANAGEMENT L.P. trimmed | 260,538 | $344K | 0.1% | 2026-Q1 |
| HSBC HOLDINGS PLC added | 248,477 | $327K | 0.1% | 2026-Q1 |
| DEUTSCHE BANK AG\ added | 244,769 | $323K | 0.1% | 2026-Q1 |
| XTX Topco Ltd trimmed | 244,764 | $323K | 0.1% | 2026-Q1 |
| JENNISON ASSOCIATES LLC added | 229,794 | $303K | 0.1% | 2026-Q1 |
| BARCLAYS PLC trimmed | 222,347 | $293K | 0.1% | 2026-Q1 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 188,043 | $249K | 0.1% | 2026-Q1 |
| Green Alpha Advisors, LLC trimmed | 182,618 | $241K | 0.1% | 2026-Q1 |
| SEI INVESTMENTS CO added | 166,823 | $220K | 0.1% | 2026-Q1 |
| RAYMOND JAMES FINANCIAL INC trimmed | 164,558 | $217K | 0.1% | 2026-Q1 |
| Main Street Research LLC added | 152,100 | $201K | 0.1% | 2026-Q1 |
| ENVESTNET ASSET MANAGEMENT INC added | 148,961 | $197K | 0.1% | 2026-Q1 |
| AdvisorNet Financial, Inc added | 142,057 | $188K | 0.1% | 2026-Q1 |
| GSA CAPITAL PARTNERS LLP trimmed | 137,332 | $181K | 0.1% | 2026-Q1 |
| FARALLON CAPITAL MANAGEMENT LLC | 135,000 | $178K | 0.1% | 2026-Q1 |
| JPMORGAN CHASE & CO trimmed | 138,504 | $175K | 0.1% | 2026-Q1 |
| WELLS FARGO & COMPANY/MN trimmed | 131,214 | $173K | 0.1% | 2026-Q1 |
| MetLife Investment Management, LLC added | 127,090 | $168K | 0.1% | 2026-Q1 |
| Vanguard Global Advisers, LLC new | 121,781 | $161K | 0.0% | 2026-Q1 |
| VANGUARD GROUP INC trimmed | 15,017,937 | $28M | 8.7% | 2025-Q4 stale |
| EDMOND DE ROTHSCHILD HOLDING S.A. trimmed | 10,675,200 | $14M | 4.2% | 2025-Q3 stale |
| MADRONE ADVISORS, LLC trimmed | 4,976,089 | $6M | 2.0% | 2025-Q3 stale |
| NORGES BANK added | 1,552,577 | $6M | 1.8% | 2025-Q1 stale |
| Point72 (DIFC) Ltd added | 4,270,137 | $5M | 1.7% | 2025-Q3 stale |
| Koss-Olinger Consulting, LLC trimmed | 2,600,000 | $5M | 1.5% | 2025-Q4 stale |
| AMIRAL GESTION | 2,733,290 | $3M | 1.0% | 2025-Q4 stale |
| TWO SIGMA ADVISERS, LP added | 827,500 | $2M | 0.5% | 2025-Q4 stale |
| Headlands Technologies LLC added | 733,840 | $1M | 0.4% | 2025-Q4 stale |
| Senvest Management, LLC | 1,093,954 | $1M | 0.4% | 2025-Q1 stale |
| SOROS FUND MANAGEMENT LLC trimmed | 1,000,000 | $1M | 0.4% | 2025-Q1 stale |
| NORDEA INVESTMENT MANAGEMENT AB added | 884,642 | $1M | 0.3% | 2025-Q1 stale |
| Squarepoint Ops LLC trimmed | 448,558 | $839K | 0.3% | 2025-Q4 stale |
| Jackson Square Partners, LLC trimmed | 553,103 | $686K | 0.2% | 2025-Q2 stale |
| UBS AM, A DISTINCT BUSINESS UNIT OF UBS ASSET MANAGEMENT AMERICAS LLC trimmed | 531,321 | $627K | 0.2% | 2025-Q1 stale |
| TORONTO DOMINION BANK trimmed | 500,100 | $590K | 0.2% | 2025-Q1 stale |
| Swiss National Bank | 475,246 | $561K | 0.2% | 2025-Q1 stale |
| ALGERT GLOBAL LLC | 273,557 | $323K | 0.1% | 2025-Q1 stale |
| Man Group plc added | 250,276 | $320K | 0.1% | 2025-Q3 stale |
| DekaBank Deutsche Girozentrale | 73,300 | $296K | 0.1% | 2025-Q4 stale |
| POLEN CAPITAL MANAGEMENT LLC new | 137,149 | $256K | 0.1% | 2025-Q4 stale |
| Virtu Financial LLC added | 205,780 | $255K | 0.1% | 2025-Q2 stale |
| BANK OF MONTREAL /CAN/ added | 126,923 | $237K | 0.1% | 2025-Q4 stale |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 159,645 | $188K | 0.1% | 2025-Q1 stale |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC trimmed | 136,683 | $161K | 0.0% | 2025-Q1 stale |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.