Tybourne Capital
Tybourne Capital Management · SEC CIK 1553936
Asia-informed global long/short.
This filing is 340 days old. Tybourne Capital Management keeps roughly 66% of its positions in a typical quarter, so about 22% of this book is likely still intact today.
How half-life is computedSnapshot half-life is the number of days after the period end at which half of this specific fund's reported book is expected to have changed, measured from its own past filings. It is a decay estimate, not knowledge of current positions.
Largest holdings, as filed
Top 4 of 4 positions. Weights are against the whole filed book. 13F filings cover US-listed holdings only.
| Company | Ticker | Value | % of book | Freshness |
|---|---|---|---|---|
| TAYSHA GENE THERAPIES INC (TSHA US) | TSHA | $12.10M | 39.1% | |
| FORTE BIOSCIENCES INC (FBRX US) | FBRX | $11.80M | 38.1% | |
| ALUMIS INC (ALMS US) | ALMS | $5.58M | 18.1% | |
| ZENTALIS PHARMACEUTICALS INC (ZNTL US) | ZNTL | $1.45M | 4.7% |
Freshness: how likely each position is still held today, from this fund's own turnover history, each position's tenure and the filing's age. Hover a bar for the numbers. Method.
What changed last quarter
Between Q2 2025 and Q3 2025, the largest trim was TSHA (shares down 10%); BCYC, MBUU no longer appear among the previous quarter's largest positions. All of it computed from the two filings, nothing inferred.
Biggest buys, Q3 2025
No new or increased common-stock positions detected.
Common questions
What are Tybourne Capital's biggest holdings?
As of the Q3 2025 13F, the largest reported positions at Tybourne Capital Management are TSHA (39.1% of the book), FBRX (38.1% of the book), ALMS (18.1% of the book).
How big is Tybourne Capital Management's portfolio?
The latest 13F reports $30.93M across 4 US-listed positions. 13F filings cover US-listed holdings only, so non-US positions and shorts are not included.
Does Tybourne Capital still hold these positions?
Unknown for certain: a 13F may be filed up to 45 days after quarter end. Based on Tybourne Capital Management's own filing history, the fund keeps roughly 66% of positions in a typical quarter, so at 340 days since the period end roughly 22% of this book is likely intact. The snapshot half-life for this fund is about 154 days.
What did Tybourne Capital buy and sell last quarter?
Between Q2 2025 and Q3 2025, the largest trim was TSHA (shares down 10%); BCYC, MBUU no longer appear among the previous quarter's largest positions. All of it computed from the two filings, nothing inferred.
Inside the app: the full book for Tybourne Capital Management, quarter on quarter buys and sells, consensus across 140+ funds and copy-to-watchlist.
Source: SEC EDGAR 13F filings. Values are as filed and cover US-listed positions only. A 13F may be filed up to 45 days after the quarter ends, so positions can change before the filing is even public; the freshness figures above quantify that lag instead of hiding it. Educational information, not financial advice.