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Diameter Capital Partners LP — 13F Holdings & Portfolio

CIK 1727012 · latest 13F-HR filed 2026-05-15

Backtest portfolio

Diameter Capital Partners LP manages $1.07B in 13F-reported U.S. long-equity assets across 29 reported positions as of its 2026-03-31 13F-HR filing. Its largest disclosed positions are SPY (30.44%), SATS (16.12%), IWM (9.29%). Quarter over quarter (versus its 2025-12-31 filing) the fund opened 7 new positions, exited 23, added to 5, and trimmed 8.

AUM is the long-equity portion reported on Form 13F-HR. Excludes short positions, cash, foreign holdings, and non-13F assets. For informational purposes only — not investment advice.

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AUM

$1.07B

Long-equity book

Holdings

29

Distinct positions

Period

2026-03-31

Filed 2026-05-15

Q/Q Activity

+7 / −23 / ↑5 / ↓8

vs 2025-12-31

Firm Profile & Key People
Name Title / Status Ownership Type

Top Adds (vs prior quarter)

  • UNITI GROUP LLC$42.8M +406.8%
  • SLR INVESTMENT CORP$5.7M +93.6%
  • BARINGS BDC INC$3.2M +36.5%
  • PENNANTPARK FLOATING RATE CA$2.3M +21.2%
  • NUVEEN CHURCHILL DIRECT LEND$1.3M +7.7%
Show all 5 →

Top Trims

  • ECHOSTAR CORP-$237.4M -58.0%
  • MASTERBRAND INC-$53.5M -80.6%
  • JAMES HARDIE INDS PLC-$19.8M -95.4%
  • SILA REALTY TRUST INC-$15.9M -39.0%
  • RH-$8.8M -67.2%
Show all 8 →

New Positions

  • NEBIUS GROUP N.V.$38.5M
  • NEBIUS GROUP N.V.$37.2M
  • FORTUNE BRANDS INNOVATIONS I$26.5M
  • PG&E CORP$21.1M
  • UWM HOLDINGS CORPORATION$21.0M
Show all 7 →

Exited Positions

  • TELEPHONE & DATA SYS INC$43.8M
  • ALIBABA GROUP HLDG LTD$41.3M
  • FS KKR CAP CORP$33.7M
  • AES CORP$28.0M
  • BAIN CAP GSS INVT CORP$20.4M
Show all 23 →
All Holdings

Rows tagged Call or Put are options positions, not stock. Per SEC Form 13F-HR, Value shows the notional value of the underlying (shares covered × underlying price), not the option premium. Shares is the number of underlying shares covered (divide by 100 for contract count).

# Issuer Symbol CUSIP Value Weight Shares Type
1 STATE STR SPDR S&P 500 ETF T Put SPY 78462F103 $325.2M 30.44% 500,000 SH
2 ECHOSTAR CORP SATS 278768106 $172.2M 16.12% 1,470,584 SH
3 ISHARES TR Put IWM 464287655 $99.2M 9.29% 400,000 SH
4 UNITI GROUP LLC UNIT 912932100 $53.3M 4.99% 5,681,528 SH
5 NEBIUS GROUP N.V. NBIS 63954QAJ5 $38.5M 3.60% 40,000,000 PRN
6 NEBIUS GROUP N.V. NBIS 63954QAL0 $37.2M 3.48% 40,000,000 PRN
7 FORTUNE BRANDS INNOVATIONS I FBIN 34964C106 $26.5M 2.48% 680,000 SH
8 BOOKING HOLDINGS INC Put BKNG 09857L108 $25.3M 2.36% 6,000 SH
9 SILA REALTY TRUST INC SILA 146280508 $24.9M 2.33% 1,050,429 SH
10 CAESARS ENTERTAINMENT INC NE Call CZR 12769G100 $24.3M 2.28% 920,600 SH
11 HCA HEALTHCARE INC Put HCA 40412C101 $22.2M 2.08% 47,000 SH
12 PG&E CORP PCG 69331C108 $21.1M 1.97% 1,200,000 SH
13 UWM HOLDINGS CORPORATION UWMC 91823B109 $21.0M 1.97% 5,800,000 SH
14 ARK ETF TR Put ARKK 00214Q104 $20.3M 1.90% 300,000 SH
15 SELECT SECTOR SPDR TR Put XLI 81369Y704 $20.2M 1.89% 125,000 SH
16 ARDAGH METAL PACKAGING S A AMBP L02235106 $18.1M 1.69% 4,467,420 SH
17 NUVEEN CHURCHILL DIRECT LEND NCDL 67090S108 $17.5M 1.64% 1,379,361 SH
18 VISTANCE NETWORKS INC VISN 20337X109 $14.6M 1.36% 800,000 SH
19 PENNANTPARK FLOATING RATE CA PFLT 70806A106 $13.3M 1.25% 1,655,246 SH
20 MASTERBRAND INC MBC 57638P104 $12.8M 1.20% 1,545,571 SH
21 BARINGS BDC INC BBDC 06759L103 $12.1M 1.13% 1,471,800 SH
22 SLR INVESTMENT CORP SLRC 83413U100 $11.8M 1.11% 827,099 SH
23 MAGNERA CORP MAGN 55939A107 $11.5M 1.07% 1,205,793 SH
24 COLUMBUS MCKINNON CORP N Y CMCO 199333105 $10.4M 0.97% 715,783 SH
25 ALPHABET INC Call GOOGL 02079K305 $7.2M 0.67% 25,000 SH
26 RH RH 74967X103 $4.3M 0.40% 30,725 SH
27 ECHOSTAR CORP Call SATS 278768106 $2.0M 0.19% 17,100 SH
28 JAMES HARDIE INDS PLC JHX G4253H101 $947.0K 0.09% 50,000 SH
29 LIBERTY MEDIA CORP DEL FWONA 530715AL5 $320.3K 0.03% 7,783,528 PRN
Filing History
Period Filed AUM Holdings Accession
2026-03-31 2026-05-15 $1.07B 29 0001172661-26-002226
2025-12-31 2026-02-17 $1.09B 40 0001172661-26-000929
2025-09-30 2025-11-14 $1.62B 41 0001172661-25-004869