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Super Investors / Madison Avenue Partners, LP
MA

Madison Avenue Partners, LP

Quarterly 13F snapshot: US-listed longs only, no performance figures — 13F data cannot support them.

Portfolio value
$2.32B
Positions
25
Quarter ended
June 30, 2026
Filed
August 14, 2026

Reported portfolio value by quarter (27 quarters reported)

$2.33B $116M
Q4 19 Q2 21 Q4 22 Q2 24 Q4 25 Q2 26

$116M in Q4 2019 → $2.32B now. Hover for any quarter.

Holdings

As reported for the quarter ended June 30, 2026. Activity is the change in share count since the prior quarter's filing.

Holding % of portfolio Activity Shares Value
GH Graham Hldgs Co 12.1% Added 0.2% 246,368 $281M
Invitation Homes Inc 10.8% New 8,335,309 $252M
Markel Group Inc 9.4% Added 28% 112,325 $219M
Coupang Inc 9.3% Added 33% 12,457,195 $216M
MI Magnum Ice Cream Co Nv 8.2% Trimmed 4.8% 10,892,592 $190M
Theravance Biopharma Inc 6.7% Trimmed 3.1% 9,212,252 $157M
Solventum Corp 5.8% Trimmed 7.2% 1,741,221 $134M
Staar Surgical Co 5.2% Added 71% 4,175,748 $120M
IP Indivior PLC 5.1% Trimmed 33% 2,874,368 $118M
Lakefront Biotherapeutics Nv 4.4% Added 40% 3,447,807 $103M
GM Globus Med Inc 3.2% Added 30% 935,216 $73.9M
Octave Intelligence PLC 3.0% New 4,222,663 $68.8M
BA British Amern Tob PLC 2.8% Trimmed 7.2% 1,043,302 $64.4M
Stagwell Inc 2.6% Unchanged 8,014,322 $59.5M
Sanmina Corp 2.1% New 188,322 $47.7M
PS Primoris Svcs Corp 2.0% New 462,058 $45.8M
Array Digital Infrastructure 1.7% New 1,109,463 $40.2M
AI Apartment Invt & Mgmt Co 1.6% Unchanged 12,374,991 $36.8M
Sandisk Corp 0.9% Trimmed 98% 9,698 $22.1M
TP Turning Pt Brands Inc 0.9% Added 0.0% 247,823 $21M
Sinclair Inc 0.8% Trimmed 6.1% 1,383,470 $19.7M
Magnera Corp 0.7% Trimmed 18% 1,302,066 $15.3M
MP Millrose Pprys Inc 0.4% New 298,461 $8.97M
Keros Therapeutics Inc 0.3% Unchanged 626,583 $6.7M
Monro Inc 0.1% New 95,966 $1.64M

Timeline of changes

What changed each quarter, from the filings' own share counts. Largest moves first; most recent 8 quarters.

Q2 2026

quarter ended June 30, 2026 · filed August 14, 2026

Company Action Shares changed Value of change % of portfolio
Sandisk Corp Trimmed −609,312 −$1.39B 0.9%
Invitation Homes Inc New +8,335,309 +$252M 10.8%
Icon PLC Exited −1,282,838 −$142M
Molina Healthcare Inc Exited −633,877 −$84.5M
Octave Intelligence PLC New +4,222,663 +$68.8M 3.0%
IP Indivior PLC Trimmed −1,440,794 −$59.1M 5.1%
Coupang Inc Added +3,093,574 +$53.7M 9.3%
Staar Surgical Co Added +1,734,070 +$49.8M 5.2%
Markel Group Inc Added +24,436 +$47.7M 9.4%
Sanmina Corp New +188,322 +$47.7M 2.1%

Showing the 10 largest of 31 changes.

Q1 2026

quarter ended March 31, 2026 · filed May 15, 2026

Company Action Shares changed Value of change % of portfolio
Sandisk Corp Trimmed −815,162 −$518M 17.1%
Coupang Inc New +9,363,621 +$177M 7.7%
GM Globus Med Inc Trimmed −1,907,275 −$164M 2.7%
Icon PLC New +1,282,838 +$142M 6.2%
SA Solstice Advanced Matls Inc Exited −2,782,460 −$135M
MI Magnum Ice Cream Co Nv Added +5,016,233 +$75M 7.4%
IP Indivior PLC Trimmed −1,965,340 −$59.9M 5.7%
UM Unifirst Corp Mass Exited −303,844 −$58.6M
AI Apartment Invt & Mgmt Co New +12,374,991 +$50.4M 2.2%
Staar Surgical Co New +2,441,678 +$45.7M 2.0%

Showing the 10 largest of 23 changes.

Q4 2025

quarter ended December 31, 2025 · filed February 17, 2026

Company Action Shares changed Value of change % of portfolio
IP Indivior PLC New +6,280,502 +$225M 9.7%
IP Indivior PLC Exited −6,463,585 −$156M
Sandisk Corp Trimmed −628,349 −$149M 14.6%
SA Solstice Advanced Matls Inc New +2,782,460 +$135M 5.8%
Molina Healthcare Inc New +633,877 +$110M 4.7%
MI Magnum Ice Cream Co Nv New +6,429,296 +$102M 4.4%
UM Unifirst Corp Mass New +303,844 +$58.6M 2.5%
NN News Corp New Exited −1,453,322 −$44.6M
Keros Therapeutics Inc Trimmed −1,884,511 −$38.4M 0.7%
AI Apartment Invt & Mgmt Co Exited −3,617,314 −$28.7M

Showing the 10 largest of 24 changes.

Q3 2025

quarter ended September 30, 2025 · filed November 14, 2025

Company Action Shares changed Value of change % of portfolio
Sandisk Corp Trimmed −1,508,588 −$169M 13.8%
BA British Amern Tob PLC New +1,223,767 +$65M 3.9%
Sage Therapeutics Inc Exited −6,077,065 −$55.4M
GM Globus Med Inc Added +836,015 +$47.9M 8.7%
NN News Corp New New +1,453,322 +$44.6M 2.7%
WJ Wiley John & Sons Inc Trimmed −882,072 −$35.7M 2.8%
IP Indivior PLC Trimmed −1,458,593 −$35.2M 9.3%
Innovex International Inc Exited −1,767,997 −$27.6M
MP Millrose Pptys Inc Exited −825,804 −$23.5M
Solventum Corp Trimmed −255,968 −$18.7M 8.7%

Showing the 10 largest of 24 changes.

Q2 2025

quarter ended June 30, 2025 · filed August 14, 2025

Company Action Shares changed Value of change % of portfolio
Sandisk Corp New +3,571,109 +$162M 10.8%
GM Globus Med Inc New +1,712,148 +$101M 6.7%
GN Galapagos Nv New +1,877,011 +$52.5M 3.5%
PG&E Corp Exited −2,950,000 −$50.7M
Solventum Corp Trimmed −568,673 −$43.1M 11.4%
Keros Therapeutics Inc New +2,691,465 +$35.9M 2.4%
MP Millrose Pptys Inc New +825,804 +$23.5M 1.6%
Cargo Therapeutics Inc Added +4,092,674 +$16.9M 1.2%
Sage Therapeutics Inc Added +1,599,267 +$14.6M 3.7%
Markel Group Inc Trimmed −7,047 −$14.1M 11.2%

Showing the 10 largest of 26 changes.

Q1 2025

quarter ended March 31, 2025 · filed May 15, 2025

Company Action Shares changed Value of change % of portfolio
Markel Group Inc New +91,357 +$171M 14.5%
EG Endeavor Group Hldgs Inc Exited −2,397,658 −$75M
Acadia Healthcare Company Inc Trimmed −1,915,841 −$58.1M
PG&E Corp New +2,950,000 +$50.7M 4.3%
IP Indivior PLC Added +4,118,663 +$39.3M 6.3%
Sage Therapeutics Inc New +4,477,798 +$35.6M 3.0%
Innovex International Inc Added +727,132 +$13.1M 3.7%
CM Columbus Mckinnon Corp N Y New +619,343 +$10.5M 0.9%
Acelyrin Inc New +4,142,640 +$10.2M 0.9%
GH Graham Hldgs Co Added +10,000 +$9.61M 20.0%

Showing the 10 largest of 18 changes.

Q4 2024

quarter ended December 31, 2024 · filed February 14, 2025

Company Action Shares changed Value of change % of portfolio
Liberty Broadband Corp Exited −1,696,584 −$131M
GM Globus Med Inc Exited −1,137,050 −$81.3M
Acadia Healthcare Company Inc New +1,925,327 +$76.3M 8.1%
Magnera Corp New +3,406,293 +$61.9M 6.6%
EG Endeavor Group Hldgs Inc Added +1,667,398 +$52.2M 7.9%
Quidelortho Corp Exited −1,033,382 −$47.1M
DD Ducommun Inc Del Exited −363,729 −$23.9M
NN News Corp New Exited −428,040 −$11.4M
Amentum Holdings Inc Exited −383,218 −$11.1M
Innovex International Inc Added +662,009 +$9.25M 2.5%

Showing the 10 largest of 21 changes.

Q3 2024

quarter ended September 30, 2024 · filed November 14, 2024

Company Action Shares changed Value of change % of portfolio
Liberty Broadband Corp New +1,696,584 +$131M 12.2%
Sharkninja Inc Trimmed −715,426 −$77.8M 0.1%
IP Indivior PLC Added +3,737,340 +$36.4M 3.6%
WJ Wiley John & Sons Inc Added +659,689 +$31.8M 10.2%
Solventum Corp Added +362,738 +$25.3M 18.3%
Quidelortho Corp Trimmed −463,766 −$21.1M 4.4%
EG Endeavor Group Hldgs Inc New +730,260 +$20.9M 1.9%
GM Globus Med Inc Trimmed −279,118 −$20M 7.5%
Innovex International Inc New +1,024,467 +$15M 1.4%
Atmus Filtration Technologies Inc Exited −415,366 −$12M

Showing the 10 largest of 21 changes.

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