Who owns Passage Bio (PASG)
Which tracked institutional funds hold PASG, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See PASG company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-08-14). 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 PASG is one-sided between 2026-Q1 and 2026-Q2: 2 added or opened and 7 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
PASG’s largest tracked holder by dollar value, CITADEL ADVISORS LLC, sizes it at 0.0% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 0.0pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in PASG 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 2026-Q1 and 2026-Q2, across 27 tracked filers holding PASG, 8 increased or opened the position and 18 reduced or closed it; over the same quarter, open-market insider Form 4s were net purchases.
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 PASG between the 2026-Q1 and 2026-Q2 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 2
- CITADEL ADVISORS LLC$4M
- BALYASNY ASSET MANAGEMENT L.P.$522K
Full exits 2
- Vestal Point Capital, LP$2M
- Eversept Partners, LP$1M
Largest trims
- Lynx1 Capital Management LP$2M
- RENAISSANCE TECHNOLOGIES LLC$815K
- VANGUARD CAPITAL MANAGEMENT LLC$338K
- Erste Asset Management GmbH$330K
- Yiheng Capital Management, L.P.$256K
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 |
|---|---|---|---|---|
| CITADEL ADVISORS LLC added | 2,886,125 | $4M | 22.5% | 2026-Q2 |
| Lynx1 Capital Management LP added | 673,759 | $3M | 17.2% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC | 113,964 | $556K | 2.9% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. new | 107,025 | $522K | 2.7% | 2026-Q2 |
| Ikarian Capital, LLC added | 99,517 | $486K | 2.5% | 2026-Q2 |
| Yiheng Capital Management, L.P. | 86,097 | $420K | 2.2% | 2026-Q2 |
| RENAISSANCE TECHNOLOGIES LLC trimmed | 47,892 | $234K | 1.2% | 2026-Q2 |
| Erste Asset Management GmbH trimmed | 40,665 | $197K | 1.0% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC trimmed | 37,026 | $181K | 0.9% | 2026-Q2 |
| Verdad Advisers, LP added | 30,728 | $150K | 0.8% | 2026-Q2 |
| BOOTHBAY FUND MANAGEMENT, LLC added | 28,439 | $139K | 0.7% | 2026-Q2 |
| BlackRock, Inc. trimmed | 27,910 | $136K | 0.7% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO | 17,049 | $83K | 0.4% | 2026-Q2 |
| DELTEC ASSET MANAGEMENT LLC new | 15,000 | $73K | 0.4% | 2026-Q2 |
| UBS Group AG trimmed | 13,565 | $66K | 0.3% | 2026-Q2 |
| Fiduciary Trust Co | 10,750 | $52K | 0.3% | 2026-Q2 |
| GTS SECURITIES LLC new | 10,000 | $49K | 0.3% | 2026-Q2 |
| MORGAN STANLEY trimmed | 2,389 | $12K | 0.1% | 2026-Q2 |
| Vanguard Global Advisers, LLC | 638 | $3K | 0.0% | 2026-Q2 |
| BARCLAYS PLC | 212 | $1K | 0.0% | 2026-Q2 |
| SBI Securities Co., Ltd. added | 169 | $825 | 0.0% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN | 115 | $561 | 0.0% | 2026-Q2 |
| OSAIC HOLDINGS, INC. | 15 | $73 | 0.0% | 2026-Q2 |
| JPMORGAN CHASE & CO | 15 | $73 | 0.0% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS | 12 | $59 | 0.0% | 2026-Q2 |
| LRI Investments, LLC | 12 | $59 | 0.0% | 2026-Q2 |
| HARBOUR INVESTMENTS, INC. | 3 | $15 | 0.0% | 2026-Q2 |
| Vestal Point Capital, LP | 305,000 | $2M | 12.5% | 2026-Q1 stale (1 quarter behind) |
| Eversept Partners, LP added | 131,581 | $1M | 5.4% | 2026-Q1 stale (1 quarter behind) |
| ACADIAN ASSET MANAGEMENT LLC | 24,196 | $189K | 1.0% | 2026-Q1 stale (1 quarter behind) |
| DIADEMA PARTNERS LP new | 19,530 | $153K | 0.8% | 2026-Q1 stale (1 quarter behind) |
| XTX Topco Ltd trimmed | 12,627 | $99K | 0.5% | 2026-Q1 stale (1 quarter behind) |
| Persistent Asset Partners Ltd new | 4,955 | $39K | 0.2% | 2026-Q1 stale (1 quarter behind) |
| Rockefeller Capital Management L.P. added | 800 | $6K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| Tower Research Capital LLC (TRC) added | 502 | $4K | 0.0% | 2026-Q1 stale (1 quarter behind) |
| Parallel Advisors, LLC | 16 | $126 | 0.0% | 2026-Q1 stale (1 quarter behind) |
| CWM, LLC | 1 | $8 | 0.0% | 2026-Q1 stale (1 quarter behind) |
| ROYAL BANK OF CANADA new | 2 | — | 0.0% | 2026-Q1 stale (1 quarter behind) |
| TSFG, LLC | 5 | — | 0.0% | 2026-Q1 stale (1 quarter behind) |
| VANGUARD GROUP INC added | 126,645 | $1M | 7.8% | 2025-Q4 stale (2 quarters behind) |
| NORTHERN TRUST CORP trimmed | 14,217 | $168K | 0.9% | 2025-Q4 stale (2 quarters behind) |
| Quadrature Capital Ltd new | 12,578 | $148K | 0.8% | 2025-Q4 stale (2 quarters behind) |
| Squarepoint Ops LLC trimmed | 10,799 | $127K | 0.7% | 2025-Q4 stale (2 quarters behind) |
| NANO CAP NEW MILLENNIUM GROWTH FUND L P new | 10,000 | $118K | 0.6% | 2025-Q4 stale (2 quarters behind) |
| BANK OF AMERICA CORP /DE/ | 28 | $331 | 0.0% | 2025-Q4 stale (2 quarters behind) |
| NORTHWESTERN MUTUAL WEALTH MANAGEMENT CO | 2 | $163 | 0.0% | 2025-Q4 stale (2 quarters behind) |
| New Leaf Venture Partners, L.L.C. trimmed | 87,426 | $702K | 3.7% | 2025-Q3 stale (3 quarters behind) |
| TANG CAPITAL MANAGEMENT LLC trimmed | 75,000 | $602K | 3.2% | 2025-Q3 stale (3 quarters behind) |
| ORBIMED ADVISORS LLC trimmed | 59,046 | $474K | 2.5% | 2025-Q3 stale (3 quarters behind) |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC trimmed | 20,803 | $167K | 0.9% | 2025-Q3 stale (3 quarters behind) |
| MAI Capital Management trimmed | 200 | $2K | 0.0% | 2025-Q3 stale (3 quarters behind) |
| CITIGROUP INC new | 77 | $617 | 0.0% | 2025-Q3 stale (3 quarters behind) |
| STATE STREET CORP | 156,773 | $63K | 0.3% | 2025-Q2 stale (4 quarters behind) |
| RBF Capital, LLC | 142,807 | $57K | 0.3% | 2025-Q2 stale (4 quarters behind) |
| SIMPLEX TRADING, LLC added | 82,983 | $33K | 0.2% | 2025-Q2 stale (4 quarters behind) |
| DLK Investment Management, LLC added | 61,000 | $24K | 0.1% | 2025-Q2 stale (4 quarters behind) |
| TWO SIGMA INVESTMENTS, LP added | 47,156 | $19K | 0.1% | 2025-Q2 stale (4 quarters behind) |
| RITHOLTZ WEALTH MANAGEMENT new | 25,392 | $10K | 0.1% | 2025-Q2 stale (4 quarters behind) |
| Mariner, LLC | 11,934 | $5K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| TWO SIGMA SECURITIES, LLC trimmed | 11,724 | $5K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| GOLDMAN SACHS GROUP INC trimmed | 11,591 | $5K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| MILLENNIUM MANAGEMENT LLC trimmed | 10,733 | $4K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| RAYMOND JAMES FINANCIAL INC new | 6,391 | $3K | 0.0% | 2025-Q2 stale (4 quarters behind) |
| GROUP ONE TRADING LLC | 47 | $19 | 0.0% | 2025-Q2 stale (4 quarters behind) |
| Mid-American Wealth Advisory Group, Inc. new | 32 | $13 | 0.0% | 2025-Q2 stale (4 quarters behind) |
| CONCOURSE FINANCIAL GROUP SECURITIES, INC. | 0 | — | 0.0% | 2025-Q2 stale (4 quarters behind) |
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.