Islander Capital Partners, L.P. holds a concentrated book of 13 reported positions worth $275.7M as of Q2 2026 (disclosed Aug 14, 2026, a ~45-day 13F lag). This quarter they opened Madison Square Garden Sports and trimmed Affirm Holdings Inc. Their largest long position is Spotify Technology Sa at 18% of the reported non-option book. Cloning the disclosed picks since 2026 would be +11% (+19.1%/yr). That is a simulation of the disclosed long book, not audited returns.
Following at the filing date actually beat the quarter-end book by 22.3 points over this window.
Growth of $10,000 cloning Islander Capital Partners, L.P.'s disclosed long 13F book, rebalanced on each filing date (so it reflects each quarter's actual reporting lag, ~45 days for the latest filing, with no look-ahead), total-return basis (dividends reinvested), derived from end-of-day prices. “Their reported book” values the same picks from quarter-end, before they were public. S&P 500 is SPY total return over the same window. Excludes shorts, cash, options and non-13F holdings. Not investment advice.
Top-heavy: concentrated book
Share of the disclosed book in its largest positions. A higher top-5 share means a more concentrated, higher-conviction portfolio.
100% mapped to company sectors
Direct operating-company sectors from our SIC-based security master. ETF/fund and unclassified holdings stay visible separately; this is not ETF look-through exposure.
Estimated $ traded · quarter-end prices (an exit at the prior quarter-end), no cost basis
Other tracked managers holding the same core names as Islander Capital Partners, L.P.
| Manager / fund | Shared names | Their $ in those |
|---|---|---|
| Barton Investment Management | 5 / 13 | $479.6M |
| Altarock Partners LP | 2 / 13 | $2.5B |
| Sellaronda Global Management LP | 3 / 13 | $79.4M |
| Skye Global Management LP | 5 / 13 | $2.6B |
| Ashe Capital Management, LP | 3 / 13 | $404.5M |
| Nellore Capital Management LLC | 2 / 13 | $297.2M |
| Bluegrass Capital Partners LP | 2 / 13 | $48.9M |
| Blacksheep Fund Management Ltd | 2 / 13 | $94.4M |
Ranked by the share of each fund's own book sitting in the names it shares with Islander Capital Partners, L.P.: only funds sharing at least a tenth of the book qualify. Index giants, bank custody books and market makers are excluded. They hold everything, so their overlap says nothing.
Bars show each position's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Spotify Technology S A SHS | $49.4M | 107.5K | 17.9% | ▲+4.7% Added · +5K sh | |
| 2 | Affirm Hldgs Inc COM CL A | $43.1M | 529.1K | 15.6% | ▼−7.2% Reduced · −41K sh | |
| 3 | Sphere Entertainment Co CL A | $38.1M | 220.0K | 13.8% | —Held | |
| 4 | Shopify Inc CL A SUB VTG SHS | $37.2M | 326.0K | 13.5% | ▲+66% Added · +130K sh | |
| 5 | Klaviyo Inc COM SER A | $20.9M | 1.38M | 7.6% | ▲+13% Added · +157K sh | |
| 6 | Transdigm Group Inc COM | $19.4M | 14.6K | 7.0% | ▲+7.4% Added · +1K sh | |
| 7 | Madison Square GRDN SPRT Cor CL A | $17.7M | 44.1K | 6.4% | ▲New New position | |
| 8 | Netflix Inc. COM | $13.3M | 185.8K | 4.8% | ▼−7.0% Reduced · −14K sh | |
| 9 | Liberty Media Corp Del COM LBTY ONE S C | $9.5M | 100.0K | 3.5% | ▲+67% Added · +40K sh | |
| 10 | Doordash Inc CL A | $8.3M | 45.0K | 3.0% | —Held | |
| 11 | Amazon Com Inc COM | $7.6M | 32.0K | 2.8% | —Held | |
| 12 | Rivian Automotive Inc COM CL A | $6.3M | 363.7K | 2.3% | ▲New New position | |
| 13 | Madison Square Garden Entmt COM CL A | $4.9M | 60.0K | 1.8% | ▼−25% Reduced · −20K sh |
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Use Arkolith to show Islander Capital Partners, L.P.'s latest holdings, largest changes, and filing provenance.
As-of date vs the date the SEC received each filing
Reported 13F total per quarter. Raw filing totals can include option notional.
Holdings from SEC EDGAR 13F-HR filings, updated quarterly, filed up to 45 days after quarter-end. Public domain. Book totals and portfolio weights cover reported non-option positions, which can include notes and warrants. Disclosed put/call options are listed separately and excluded from those totals. The performance line is a simulation of the disclosed long book, not an audited return.