Madison Avenue Partners, LP
CIK 1801265 · EDGAR ↗
- sum of disclosed values for 2026-03-31; 0 positions have no disclosed value and are left out of the sum, counted here rather than dropped
- $2.3B
- every reported holding for this filer and quarter, including ones with no disclosed value
- 27
- positions with no comparable holding in the prior quarter (kind new), 2026-03-31
- 7
- positions absent from this quarter's filing after being held last quarter (kind exit), 2026-03-31 — inferred from absence, not a sale record
- 3
Quarter-end snapshot, filed up to 45 days later — not current holdings. What a 13F covers ↓
Changes · Quarter ended 2026-03-31. Newest filing in this build: 2026-07-31. Per-row filing dates are on each receipt.
by shares · How classified ↗Period
| The reviewed ticker for the filed issuer name and share class, the same mapping the Reported positions table uses. Symbols are never inferred from names; — means no reviewed mapping. | position matched across quarters by exact reported CUSIP over a registry gap — never a name match | NEW / ADD / TRIM / EXIT by share count · NO CHANGE = same shares; the value moved with price, so never an ADD or a TRIM · EXIT = absent this quarter (disposed, delisted, confidential, or reported by an affiliate) — the filing does not say which · NO PRIOR = no comparable prior quarter on record (a first filing, or a quarter filed inside an affiliate's report), so not called a new stake · n/c = not classifiable: value undisclosed on one side of the pair, or neither shares nor value can classify it · †v: the reported share count is unchanged across the pair; this build's data classified the change from its reported value; builds from 2026-09-10 on read it as NO CHANGE | derived by Public Filings from the published data; “no value” means the source did not disclose a usable value — never zero | Prev value | Curr value | Prev shares | Curr shares | Flags | |
|---|---|---|---|---|---|---|---|---|---|
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:12331 · issuer key iss:1618 | TRIM | +$52.8M | −815,162 | $340M | $393M | 1,434,172 | 619,010 | |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: CL A · position key pos:15789 · issuer key iss:529 | NEW | +$177M | +9,363,621 | $0 | $177M | — | 9,363,621 | |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: ORD SHS · position key pos:14381 · issuer key iss:2293 | ADD | +$69.2M | +5,016,233 | $102M | $171M | 6,429,296 | 11,445,529 | |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: SHS · position key pos:15581 · issuer key iss:2131 | NEW | +$142M | +1,282,838 | $0 | $142M | — | 1,282,838 | |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: ORD · position key pos:17511 · issuer key iss:963‡r | TRIM | −$93.8M | −1,965,340 | $225M | $132M | 6,280,502 | 4,315,162 | cusip-reconciled |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM SHS · position key pos:11077 · issuer key iss:1690 | TRIM | −$35.0M | −112,322 | $158M | $122M | 1,988,058 | 1,875,736 | |
| — | share class as filed: SPON ADR · position key sid:sec:prov:856d00daa392df84ca63299ef03992d5 · issuer key cusip6:36315X | ADD | +$1.6M | +252,010 | $72.4M | $74.0M | 2,213,169 | 2,465,179 | |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: SPONSORED ADR · position key pos:13452 · issuer key iss:320 | TRIM | −$3.6M | −100,000 | $69.3M | $65.7M | 1,223,767 | 1,123,767 | |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: CL A · position key pos:17000 · issuer key iss:829 | TRIM | −$167M | −1,907,275 | $229M | $61.8M | 2,624,751 | 717,476 | |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: CL A · position key pos:11869 · issuer key iss:138 | NEW | +$50.4M | +12,374,991 | $0 | $50.4M | — | 12,374,991 | |
| — | share class as filed: COM PAR $0.01 · position key sid:sec:prov:ca11044044ffdef73864119b9879be03 · issuer key cusip6:852312 | NEW | +$45.7M | +2,441,678 | $0 | $45.7M | — | 2,441,678 | |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: CL A · position key pos:17981 · issuer key iss:1971 | TRIM | −$9.3M | −468,841 | $35.1M | $25.8M | 1,147,258 | 678,417 | |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: CLASS A COM SHS · position key pos:12709 · issuer key iss:1480 | NEW | +$24.9M | +1,321,942 | $0 | $24.9M | — | 1,321,942 | |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: CL A · position key pos:10969 · issuer key iss:1664 | ADD | +$5.1M | +563,831 | $13.9M | $19.1M | 909,653 | 1,473,484 | |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:10250 · issuer key iss:1331 | NEW | +$16.3M | +1,365,067 | $0 | $16.3M | — | 1,365,067 | |
| — | share class as filed: COM SHS · position key sid:sec:prov:99c6c850cf0be84f9f29483e82855151 · issuer key cusip6:55939A | TRIM | −$11.8M | −190,033 | $27.0M | $15.1M | 1,780,649 | 1,590,616 | |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM CL A · position key pos:10226 · issuer key iss:422 | TRIM | −$13.3M | −548,946 | $24.0M | $10.7M | 993,879 | 444,933 | |
| — | share class as filed: COM · position key pos:16075 · issuer key iss:2419 | TRIM | −$9.9M | −197,124 | $16.8M | $6.9M | 823,707 | 626,583 | |
| — | share class as filed: COM · position key sid:sec:prov:e136758421745eef10e0f515e3d2331a · issuer key cusip6:698884 | NEW | +$6.0M | +447,878 | $0 | $6.0M | — | 447,878 | |
| — | share class as filed: COM · position key sid:sec:prov:e91f79eaf2eef531c911d747fd14cf27 · issuer key cusip6:35471R | TRIM | −$1.4M | −1,173,257 | $2.1M | $718K | 2,253,389 | 1,080,132 |
1–20 of the 23 changes on this page
Mark-to-market only (no share change) · 7
Positions whose share count is identical in both quarters; the value changed with price, not with a decision.
| The reviewed ticker for the filed issuer name and share class, the same mapping the Reported positions table uses. Symbols are never inferred from names; — means no reviewed mapping. | position matched across quarters by exact reported CUSIP over a registry gap — never a name match | NEW / ADD / TRIM / EXIT by share count · NO CHANGE = same shares; the value moved with price, so never an ADD or a TRIM · EXIT = absent this quarter (disposed, delisted, confidential, or reported by an affiliate) — the filing does not say which · NO PRIOR = no comparable prior quarter on record (a first filing, or a quarter filed inside an affiliate's report), so not called a new stake · n/c = not classifiable: value undisclosed on one side of the pair, or neither shares nor value can classify it · †v: the reported share count is unchanged across the pair; this build's data classified the change from its reported value; builds from 2026-09-10 on read it as NO CHANGE | derived by Public Filings from the published data; “no value” means the source did not disclose a usable value — never zero | Prev value | Curr value | Prev shares | Curr shares | |
|---|---|---|---|---|---|---|---|---|
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM CL B · position key pos:16314 · issuer key iss:842 | NO CHANGE | −$10.2M | 0 | $270M | $260M | 245,829 | 245,829 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:11906 · issuer key iss:1183 | NO CHANGE | −$20.7M | 0 | $189M | $168M | 87,889 | 87,889 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:17462 · issuer key iss:2233 | NO CHANGE | −$23.6M | 0 | $178M | $154M | 9,511,150 | 9,511,150 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:14538 · issuer key iss:1243 | NO CHANGE | −$25.5M | 0 | $110M | $84.5M | 633,877 | 633,877 |
| — | share class as filed: COM CL A · position key sid:sec:prov:ccf3eb42d1d627002804f4dd0c518b0e · issuer key cusip6:85256A | NO CHANGE | +$11.2M | 0 | $39.2M | $50.4M | 8,014,322 | 8,014,322 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM · position key pos:17752 · issuer key iss:1831 | NO CHANGE | −$5.4M | 0 | $26.9M | $21.5M | 247,723 | 247,723 |
| a reviewed mapping row for this filed issuer name and share class (never inferred from the name) | share class as filed: COM SHS · position key pos:10705 · issuer key iss:2209 | NO CHANGE | −$36.9K | 0 | $688K | $651K | 6,152 | 6,152 |
Flags: no row carries a flag.
Holdings without a security ID are counted, not compared. Method ↗
Reported positions — 2026-03-31
27 positionsViewThis build carries one quarter for this manager: 2026-03-31. Notable managers carry four published quarters, others two.
| This list carries reported issuer names and security identities, without a dated ticker mapping. Symbols are not inferred from names. | a position composed from a base filing plus NEW-HOLDINGS amendments keeps every source row here; the composition's latest filed date is the one shown served from this build's published holdings (derived from the filer's own reported rows); every row resolves to its filing | Share of total reported value, calculated only when the full position list has disclosed values. This is 13F long value, not total assets. | value undisclosed on the filing: retained and counted, excluded from sums, never shown as $0 | Shares | Wt |
|---|---|---|---|---|---|
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | SANDISK CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $393M | 619,010 | 17.1% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | GRAHAM HLDGS CO · COM CL B CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $260M | 245,829 | 11.3% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | COUPANG INC · CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $177M | 9,363,621 | 7.7% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | MAGNUM ICE CREAM CO NV · ORD SHS CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $171M | 11,445,529 | 7.4% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | MARKEL GROUP INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $168M | 87,889 | 7.3% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | THERAVANCE BIOPHARMA INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $154M | 9,511,150 | 6.7% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ICON PLC · SHS CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $142M | 1,282,838 | 6.2% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | INDIVIOR PLC · ORD CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $132M | 4,315,162 | 5.7% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | SOLVENTUM CORP · COM SHS CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $122M | 1,875,736 | 5.3% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | MOLINA HEALTHCARE INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $84.5M | 633,877 | 3.7% | |
| — | GALAPAGOS NV · SPON ADR CUSIP 36315X101 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $74.0M | 2,465,179 | 3.2% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | BRITISH AMERN TOB PLC · SPONSORED ADR CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $65.7M | 1,123,767 | 2.9% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | GLOBUS MED INC · CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $61.8M | 717,476 | 2.7% | |
| — | STAGWELL INC · COM CL A CUSIP 85256A109 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $50.4M | 8,014,322 | 2.2% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | APARTMENT INVT & MGMT CO · CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $50.4M | 12,374,991 | 2.2% | |
| — | STAAR SURGICAL CO · COM PAR $0.01 CUSIP 852312305 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $45.7M | 2,441,678 | 2.0% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | WILEY JOHN & SONS INC · CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $25.8M | 678,417 | 1.1% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | PRIMO BRANDS CORPORATION · CLASS A COM SHS CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $24.9M | 1,321,942 | 1.1% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | TURNING PT BRANDS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $21.5M | 247,723 | 0.9% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | SINCLAIR INC · CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $19.1M | 1,473,484 | 0.8% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | DNOW INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $16.3M | 1,365,067 | 0.7% | |
| — | MAGNERA CORP · COM SHS CUSIP 55939A107 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $15.1M | 1,590,616 | 0.7% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | CENTRAL BANCOMPANY · COM CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $10.7M | 444,933 | 0.5% | |
| — | KEROS THERAPEUTICS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $6.9M | 626,583 | 0.3% | |
| — | PAR TECHNOLOGY CORP · COM CUSIP 698884103 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $6.0M | 447,878 | 0.3% | |
| — | FRANKLIN STR PPTYS CORP · COM CUSIP 35471R106 quarter ended 2026-03-31 filed filed 2026-05-15 +45d ticker not yet mapped | $718K | 1,080,132 | 0.0% | |
| verified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | SHARKNINJA INC · COM SHS CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $651K | 6,152 | 0.0% |
1–20 of 27 positions
1–27 of 27 positions · page 1 of 1
One line per issuer, largest first — open a line for its reported rows. Grouping ↗
Book shape
Tick = median of the 8,748 tracked filers with a 2026-03-31 book (the index median: the 8,662 with a complete book). Concentration uses reported 13F long value, not total assets; the index is withheld when any position lacks a value.- 99.9%above median 80.0%
- integer Herfindahl–Hirschman index in basis points over disclosed position values
- 790 bpsabove median 446 bps
- holdings with no disclosed value (undisclosed, or unreadable on the filing) — kept and counted, never shown as zero
- 27 / 27median book 97.5 positions
30 quarter-over-quarter rows
Filing history
| Period | Source |
|---|---|
| 2026-03-31 | EDGAR ↗ |
Complete source filings on SEC EDGAR
The filing on EDGAR is the record, including any filed after this build.
Open Madison Avenue Partners, LP's 13F filings on SEC EDGAR ↗A 13F is a quarterly, long-only snapshot filed up to 45 days late — not current holdings. what a 13F covers ↗
13F reports cover LONG positions in Section 13(f) securities (US exchange-traded equities plus reportable options, warrants, certain convertibles) held by managers with at least $100M in such securities — so managers below that threshold are absent entirely. No short positions, no cash, no non-13(f) assets — not a full portfolio, and not a census of institutional ownership.
Positions are quarter-end snapshots filed up to 45 days late — not current holdings: a position may have changed or closed since the quarter ended.
Values are the manager's stated market value at quarter-end in era-dependent units (whole dollars for form versions effective 2023-01-03 onward, thousands before), normalized here to whole dollars; each record notes its original unit.
Affiliated managers may report the same position, so one position can appear under more than one filer.
Positions under confidential treatment may be omitted until a later amendment discloses them.
These are disclosures, not investment advice.