Bronte Capital Management Pty Ltd.
SEC Form 13F institutional filer · CIK 0001471085
13F-HR · 16 reported holdings · 2026-03-31
Hedge fund manager.
Reported long-US-equity value
$0.65B
Top-10 concentration
95.5%
Bronte Capital Management Pty Ltd. — $655M AUM allocation strategy
Bronte Capital Management Pty Ltd. files SEC Form 13F and reports $655M of long US equity value across 16 reported holdings for 2026-03-31.
Its largest sector bet is Financials 30.2%, followed by Health Care 20.4% and Communication Services 19.5%.
The top 10 holdings account for 96% of reported value — a conviction-weighted book concentrated in its best ideas. The sector and industry splits below are of the same reported value. Track quarter-over-quarter adds, trims, new positions and exits below — sourced from SEC 13F filings, public domain.
Bronte Capital Management Pty Ltd. — latest SEC 13F insights
Reported long-US-equity value (13F AUM)
$655M
total across 16 reported holdings · 2026-03-31 · excludes shorts, cash, non-US
Top-10 concentration
96% of value
higher = narrower conviction; lower = spread / hedging
Biggest trims (shares)
−$IBKR −205K sh · −$9.62M−$AXP −99.1K sh · −$2.21M−$CTVA −66.2K sh · +$3.95M
Sector allocation (share of reported value)
each slice is a share of the reported long-US-equity value — smaller sectors and the rest of the book roll into “Other holdings”
Qtr shift = share-point change vs the prior quarter's filing — first period tracked for this filer; the column fills in with the next quarterly refresh.
Industry allocation (share of reported value)
- Biotechnology20.4%—
- Interactive Media & Services16.8%—
- Investment Banking & Brokerage13.1%—
- Multi-Sector Holdings11.4%—
- Broadline Retail9.1%—
- Tobacco8.6%—
- Fertilizers & Agricultural Chemicals6.4%—
- Consumer Finance5.7%—
- Other holdings8.5%—
the finer GICS cut of the same book — same denominator — smaller industries roll into “Other holdings”
Qtr shift = share-point change vs the prior quarter's filing — first period tracked for this filer; the column fills in with the next quarterly refresh.
Top S&P 500 holdings
9 of 9 rows · sorted by Value ↓
| Ticker | Holding | Shares | Value | Δ QoQ | Weight |
|---|---|---|---|---|---|
| $REGN | Regeneron Pharmaceuticals Inc | 173K | $134M | -3.98K | 20.4% |
| $GOOG | Alphabet Inc. Class C Capital Stock | 381K | $110M | -34.5K | 16.8% |
| $IBKR | Interactive Brokers Group Inc | 1.28M | $86M | -205K | 13.1% |
| $BRK.B | Berkshire Hathaway Inc.-Class B | 155K | $74.3M | -7.26K | 11.4% |
| $AMZN | Amazon.com Inc | 286K | $59.5M | +8.1K | 9.1% |
| $PM | Philip Morris International Inc | 341K | $56.4M | -57.5K | 8.6% |
| $CTVA | Corteva Inc | 503K | $42.1M | -66.2K | 6.4% |
| $COF | Capital One Financial Corporation | 187K | $34.2M | +11.8K | 5.2% |
| $DIS | Walt Disney Company | 186K | $17.9M | — | 2.7% |
…and 7 more holdings in the full 13F filing (top positions only shown).
SEC Form 13F data sets · public domain · 45-day filing lag · >$100M AUM managers · as reported
← All 13F filers·← QuantOrb.pro
How to read Δ QoQ — the five insight categories, and the caveats
The categories. Analysts, quants and retail traders look past total portfolio value to isolate actionable signals. Five categories matter.
Conviction & concentration shifts
New positions vs complete exits — a brand-new stock signals high conviction; a full liquidation suggests a broken thesis or tax-loss harvesting. Aggressive sizing — look at share count, not dollars: a 20% share increase during a drawdown is strong dip-buying. Concentration — a narrowing top-5/10 means conviction; spreading capital across more names means hedging.
Sector & macro allocation rotations
Aggregating Δ QoQ moves across sectors shows where smart money is leaning in or sneaking out — rotating out of growth into defensives or energy, for example. The fund's total long equity exposure quarter-over-quarter is a proxy for overall institutional risk appetite.
Crowding & smart-money consensus
When several managers initiate or expand the same stock in the same quarter, that is institutional consensus. Contrarian reads: top pickers buying hard into a beaten-down name the market is selling.
Derivative & option overlays
Reported call/put changes indicate whether managers are adding downside hedges or leveraging upside exposure. Note: a long increase may be half of a market-neutral pair trade.
Who reads this
| Retail "cloners" | High-conviction ideas to replicate ~45 days after quarter-end. |
| Corporate IR | Which funds bought or dumped the stock, before the next call. |
| Quant / algo traders | Cross-sectional factor inputs: flow, momentum, ownership. |
Four caveats before you trade on it
- 45-day lag — holdings are quarter-end; positions may already be closed.
- Long-only — 13Fs miss shorts, pair trades and cash.
- No non-US / fixed income — the picture is US equities plus options.
- Corporate actions — splits and spinoffs distort raw share deltas.
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