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Madison Avenue Partners, LP

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13F filer, CIK 1801265, NEW YORK, NY

Madison Avenue Partners, LP reported $1,177,866,512 across 22 holdings for the quarter ended 2025-03-31, in a 13F-HR filed 2025-05-15. Its ten largest share positions make up 91.35% of the portfolio.

Filed (acceptance time not in the bulk data set), ingested 13F-HR 0001801265-25-000004

Period
2025-03-31
Reported value
$1.18B
Holdings
22
Top 10 weight
91.35%
New
8
Sold out
1

Largest buys vs the previous quarter

SecurityShares changeApprox. value
MKLnew+91,357$171M
PCGnew+2,950,000$50.7M
INDIVIOR PLCadded+4,118,663$39.3M
SAGE THERAPEUTICS INCnew+4,477,798$35.6M
INVXadded+727,132$13.1M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Largest sells vs the previous quarter

SecurityShares changeApprox. value
EDRexited-2,397,658-$75M
ACHCreduced-1,915,841-$58.1M
NNIreduced-56,383-$6.25M
MAGNreduced-62,288-$1.13M
SOLVreduced-14,655-$1.11M

Ranked by the share change valued at this quarter's implied price (value over shares in the 13F). A position sold out is valued at the previous quarter's price, its last report.

Holdings, Q1 2025

Share positions as resolved from 13F-HR 0001801265-25-000004, largest first. % of portfolio is the value over $1,177,866,512, the sum of the share positions whose value is usable for ratios (method).

SecurityHistorySharesValue% of portfolioChangeLatest eventTimeline
GHCGRAHAM HLDGS COQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 235,271 shares; 2024Q4: 235,271 shares; 2025Q1: 245,271 shares 245,271$236M20.01%+10,000Timeline
SOLVSOLVENTUM CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 2,827,672 shares; 2024Q4: 2,827,672 shares; 2025Q1: 2,813,017 shares 2,813,017$214M18.16%-14,655Timeline
MKLMARKEL GROUP INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 91,357 shares 91,357$171M14.5%newTimeline
WLYWILEY JOHN & SONS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 2,290,206 shares; 2024Q4: 2,096,793 shares; 2025Q1: 2,208,066 shares 2,208,066$98.4M8.35%+111,273Timeline
TBPHTHERAVANCE BIOPHARMA INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 9,511,150 shares; 2024Q4: 9,511,150 shares; 2025Q1: 9,511,150 shares 9,511,150$84.9M7.21%0Timeline
INDIVIOR PLCINDIVIOR PLCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 3,960,772 shares; 2024Q4: 3,673,426 shares; 2025Q1: 7,792,089 shares 7,792,089$74.3M6.3%+4,118,663
MAGNMAGNERA CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 3,406,293 shares; 2025Q1: 3,344,005 shares 3,344,005$60.7M5.16%-62,288Timeline
PCGPG&E CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 2,950,000 shares 2,950,000$50.7M4.3%newTimeline
INVXINNOVEX INTERNATIONAL INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 1,024,467 shares; 2024Q4: 1,686,476 shares; 2025Q1: 2,413,608 shares 2,413,608$43.3M3.68%+727,132Timeline
STGWSTAGWELL INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 7,147,662 shares; 2024Q4: 7,147,662 shares; 2025Q1: 7,147,662 shares 7,147,662$43.2M3.67%0Timeline
SAGE THERAPEUTICS INCSAGE THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 4,477,798 shares 4,477,798$35.6M3.02%new
NNINELNET INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 290,213 shares; 2024Q4: 290,213 shares; 2025Q1: 233,830 shares 233,830$25.9M2.2%-56,383Timeline
CMCOCOLUMBUS MCKINNON CORP N YQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 619,343 shares 619,343$10.5M0.89%newTimeline
ACELYRIN INCACELYRIN INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 4,142,640 shares 4,142,640$10.2M0.87%new
CNNECANNAE HLDGS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 418,984 shares 418,984$7.68M0.65%newTimeline
FSPFRANKLIN STR PPTYS CORPQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 3,291,443 shares; 2024Q4: 2,733,418 shares; 2025Q1: 2,733,418 shares 2,733,418$4.87M0.41%0Timeline
2SEVENTY BIO INC COMMON STO…2SEVENTY BIO INC COMMON STOCKQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 2,563,222 shares; 2024Q4: 579,895 shares; 2025Q1: 579,895 shares 579,895$2.86M0.24%0
PLRXPLIANT THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 1,675,043 shares 1,675,043$2.26M0.19%newTimeline
OVIDOVID THERAPEUTICS INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 4,116,773 shares; 2024Q4: 3,722,627 shares; 2025Q1: 2,465,623 shares 2,465,623$769K0.07%-1,257,004Timeline
SNSHARKNINJA INCQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: 6,152 shares; 2024Q4: 6,152 shares; 2025Q1: 6,152 shares 6,152$513K0.04%0Timeline
CARGO THERAPEUTICS INC COMCARGO THERAPEUTICS INC COMQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: not reported; 2025Q1: 100,952 shares 100,952$411K0.03%new
ACHCACADIA HEALTHCARE COMPANY INQuarterly shares; oldest to newest; scale is this security's eight-quarter maximum; 2023Q2: restricted; 2023Q3: restricted; 2023Q4: restricted; 2024Q1: restricted; 2024Q2: restricted; 2024Q3: not reported; 2024Q4: 1,925,327 shares; 2025Q1: 9,486 shares 9,486$288K0.02%-1,915,841Timeline

Sold out in Q1 2025

Positions in the previous quarter's report that this quarter's report no longer lists.

SecurityShares beforeValue beforeType
EDRENDEAVOR GROUP HLDGS INC2,397,658$75Mshares

How Q1 2025 was built

Available 13F filings of this filer for the quarter and their roles: the base report is the latest original or restatement, NEW HOLDINGS amendments filed after it are added (method).

FilingRoleAmendmentFiledAcceptedIngested
13F-HR 0001801265-25-000004 base2025-05-15acceptance time not in the bulk data set