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Madison Avenue Partners, LP — 13F Holdings & Portfolio

CIK 1801265 · latest 13F-HR filed 2026-08-14

Backtest portfolio

Madison Avenue Partners, LP manages $2.32B in 13F-reported U.S. long-equity assets across 25 reported positions as of its 2026-06-30 13F-HR filing. Its largest disclosed positions are GHC (12.11%), INVH (10.84%), MKL (9.44%). Quarter over quarter (versus its 2026-03-31 filing) the fund opened 7 new positions, exited 9, added to 9, and trimmed 3.

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.

Filer Information
Address
150 EAST 58TH STREET
14TH FLOOR
NEW YORK, NY 10155
Phone
(212) 702-8644
Filing Manager
Madison Avenue Partners, LP
NEW YORK, NY
Signatory
Christopher Carroll
CFO / CCO
Loading holdings…
AUM

$2.32B

Long-equity book

Holdings

25

Distinct positions

Period

2026-06-30

Filed 2026-08-14

Q/Q Activity

+7 / −9 / ↑9 / ↓3

vs 2026-03-31

Firm Profile & Key People
Name Title / Status Ownership Type

Top Adds (vs prior quarter)

  • STAAR SURGICAL CO$74.1M +162.4%
  • MARKEL GROUP INC$51.1M +30.4%
  • COUPANG INC$39.6M +22.4%
  • LAKEFRONT BIOTHERAPEUTICS NV$29.4M +39.8%
  • GRAHAM HLDGS CO$21.3M +8.2%
Show all 9 →

Top Trims

  • SANDISK CORP-$371.2M -94.4%
  • APARTMENT INVT & MGMT CO-$13.6M -27.0%
  • INDIVIOR PLC-$13.6M -10.3%
Show all 3 →

New Positions

  • INVITATION HOMES INC$251.8M
  • OCTAVE INTELLIGENCE PLC$68.8M
  • SANMINA CORP$47.7M
  • PRIMORIS SVCS CORP$45.8M
  • ARRAY DIGITAL INFRASTRUCTURE$40.2M
Show all 7 →

Exited Positions

  • ICON PLC$142.0M
  • MOLINA HEALTHCARE INC$84.5M
  • WILEY JOHN & SONS INC$25.8M
  • PRIMO BRANDS CORPORATION$24.9M
  • DNOW INC$16.3M
Show all 9 →
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 GRAHAM HLDGS CO GHC 384637104 $281.2M 12.11% 246,368 SH
2 INVITATION HOMES INC INVH 46187W107 $251.8M 10.84% 8,335,309 SH
3 MARKEL GROUP INC MKL 570535104 $219.4M 9.44% 112,325 SH
4 COUPANG INC CPNG 22266T109 $216.4M 9.31% 12,457,195 SH
5 MAGNUM ICE CREAM CO NV MICC N5505D105 $189.6M 8.16% 10,892,592 SH
6 THERAVANCE BIOPHARMA INC TBPH G8807B106 $156.6M 6.74% 9,212,252 SH
7 SOLVENTUM CORP SOLV 83444M101 $134.3M 5.78% 1,741,221 SH
8 STAAR SURGICAL CO STAA 852312305 $119.8M 5.16% 4,175,748 SH
9 INDIVIOR PLC INDV 45579U109 $117.9M 5.08% 2,874,368 SH
10 LAKEFRONT BIOTHERAPEUTICS NV LKFT 36315X101 $103.4M 4.45% 3,447,807 SH
11 GLOBUS MED INC GMED 379577208 $73.9M 3.18% 935,216 SH
12 OCTAVE INTELLIGENCE PLC OCTV G22845104 $68.8M 2.96% 4,222,663 SH
13 BRITISH AMERN TOB PLC BTI 110448107 $64.4M 2.77% 1,043,302 SH
14 STAGWELL INC STGW 85256A109 $59.5M 2.56% 8,014,322 SH
15 SANMINA CORP SANM 801056102 $47.7M 2.05% 188,322 SH
16 PRIMORIS SVCS CORP PRIM 74164F103 $45.8M 1.97% 462,058 SH
17 ARRAY DIGITAL INFRASTRUCTURE AD 911684108 $40.2M 1.73% 1,109,463 SH
18 APARTMENT INVT & MGMT CO AIV 03748R747 $36.8M 1.58% 12,374,991 SH
19 SANDISK CORP SNDK 80004C200 $22.1M 0.95% 9,698 SH
20 TURNING PT BRANDS INC TPB 90041L105 $21.0M 0.90% 247,823 SH
21 SINCLAIR INC SBGI 829242106 $19.7M 0.85% 1,383,470 SH
22 MAGNERA CORP MAGN 55939A107 $15.3M 0.66% 1,302,066 SH
23 MILLROSE PPRYS INC MRP 601137102 $9.0M 0.39% 298,461 SH
24 KEROS THERAPEUTICS INC KROS 492327101 $6.7M 0.29% 626,583 SH
25 MONRO INC MNRO 610236101 $1.6M 0.07% 95,966 SH
Filing History
Period Filed AUM Holdings Accession
2026-06-30 2026-08-14 $2.32B 25 0001801265-26-000005
2026-03-31 2026-05-15 $2.30B 27 0001801265-26-000003
2025-12-31 2026-02-17 $2.33B 23 0001801265-26-000002
2025-09-30 2025-11-14 $1.68B 20 0001801265-25-000008