Diameter Capital Partners LP holds a concentrated book of 20 stocks worth $522.4M as of Q1 2026 (disclosed May 15, 2026, a ~45-day 13F lag). This quarter they opened Nebius Group NV and trimmed Echostar Corp-A. Their largest long position is Echostar Corp-A at 33% of the equity book. They also disclosed $512.4M in put options (a bearish bet) and $33.5M in call options (bullish), shown separately below and excluded from the equity book.
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curl -H "Authorization: Bearer YOUR_API_KEY" \ "https://arkolith.com/api/v1/funds/1727012/holdings"
Use Arkolith to show Diameter Capital Partners LP's latest holdings, largest changes, and filing provenance.
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.
75% 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, no cost basis
Bars show each stock's share of the portfolio. Click a row for its position history.
| # | Security | Value | Shares | % Port | Last move | History |
|---|---|---|---|---|---|---|
| 1 | Echostar Corp CL A | $172.2M | 1.47M | 33.0% | ▼−61% Reduced · −2.3M sh | |
| 2 | Uniti Group LLC COM SHS | $53.3M | 5.68M | 10.2% | ▲+279% Added · +4.2M sh | |
| 3 | Nebius Group N.V. CONVERTIBLE BOND | $38.5M | 40.00M | 7.4% | ▲New New position | |
| 4 | Nebius Group N.V. CONVERTIBLE BOND | $37.2M | 40.00M | 7.1% | ▲New New position | |
| 5 | Fortune Brands Innovations I COM | $26.5M | 680.0K | 5.1% | ▲New New position | |
| 6 | Sila Realty Trust Inc COMMON STOCK | $24.9M | 1.05M | 4.8% | ▼−40% Reduced · −700K sh | |
| 7 | PG&E Corp COM | $21.1M | 1.20M | 4.0% | ▲New New position | |
| 8 | Uwm Holdings Corporation COM CL A | $21.0M | 5.80M | 4.0% | ▲New New position | |
| 9 | Ardagh Metal Packaging S A SHS | $18.1M | 4.47M | 3.5% | ▼−17% Reduced · −909K sh | |
| 10 | Nuveen Churchill Direct Lend COM SHS | $17.5M | 1.38M | 3.4% | ▲+13% Added · +159K sh | |
| 11 | Vistance Networks Inc COM | $14.6M | 800.0K | 2.8% | ▲New New position | |
| 12 | Pennantpark Floating Rate Ca COM | $13.3M | 1.66M | 2.5% | ▲+40% Added · +471K sh | |
| 13 | Masterbrand Inc COMMON STOCK | $12.8M | 1.55M | 2.5% | ▼−74% Reduced · −4.5M sh | |
| 14 | Barings BDC Inc COM | $12.1M | 1.47M | 2.3% | ▲+52% Added · +505K sh | |
| 15 | SLR Investment Corp COM | $11.8M | 827.1K | 2.3% | ▲+109% Added · +432K sh | |
| 16 | Magnera Corp COM SHS | $11.5M | 1.21M | 2.2% | —Held | |
| 17 | Columbus McKinnon Corp N Y COM | $10.4M | 715.8K | 2.0% | ▲New New position | |
| 18 | RH COM | $4.3M | 30.7K | 0.8% | ▼−58% Reduced · −42K sh | |
| 19 | James Hardie Inds PLC ORD SHS | $947K | 50.0K | 0.2% | ▼−95% Reduced · −950K sh | |
| 20 | Liberty Media Corp Del DEB 3.750% 2/1 | $320K | 7.78M | 0.1% | ▼−0.1% Reduced · −11K sh |
Put / call positions from the 13F — totals include every disclosed option leg
| Type | Underlying | Notional value | Underlying shares |
|---|---|---|---|
| PUT · bearish | SS SPDR S&P 500 ETF TRUST-USSPY | $325.2M | 500K |
| PUT · bearish | ISHARES RUSSELL 2000 ETFIWM | $99.2M | 400K |
| PUT · bearish | BOOKING HOLDINGS INCBKNG | $25.3M | 6K |
| CALL · bullish | CAESARS ENTERTAINMENT INCCZR | $24.3M | 921K |
| PUT · bearish | HCA HEALTHCARE INCHCA | $22.2M | 47K |
| PUT · bearish | ARK INNOVATION ETFARKK | $20.3M | 300K |
| PUT · bearish | SS INDUSTRIAL SELECT SECTORXLI | $20.2M | 125K |
| CALL · bullish | ALPHABET INC-CL AGOOGL | $7.2M | 25K |
| CALL · bullish | ECHOSTAR CORP-ASATS | $2.0M | 17K |
13F filers disclose option positions at the market value of the underlying the contracts reference, not the premium paid. A put is a bearish bet (it gains if the stock falls); a call is bullish. “Underlying shares” is the share count the contracts control, not a share holding. These legs are excluded from the equity book, weighting, concentration and sector figures above.
As-of date vs the date the SEC received each filing
Holdings from SEC EDGAR 13F-HR filings, updated quarterly ~45 days after quarter-end. Public domain. The book and weighting are long equity only; disclosed put/call options are listed separately and excluded from those totals. Price-derived performance is withheld until the price-source policy and freshness gate are green.