Reported positions
Quarter-end holdings as filed
Explore the full published position list and its source filing. This record excludes the manager’s cash, shorts and non-13(f) assets.
Madison Avenue Partners, LP
- sum of disclosed values for 2026-03-31; 0 positions carry a NULL value and are excluded from the sum, surfaced here rather than folded away
- $2.3B
- ALL retained default holdings for this (filer, period), including NULL-value ones
- 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
A quarter-end snapshot. Filed up to 45 days later, so this page is not current holdings and never a complete portfolio. what a 13F is — and is not ↓ methodology §13F ↗
Position changes — into 2026-03-31
by shares · Δ value · filing link · how changes are classified §Period
position matched across quarters by exact reported CUSIP over a registry gap — producer-reconciled identity, never a name match identity_reconciled_by_cusip | 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 classified_by_value · EXIT = absent this quarter: disposed, delisted, under confidential treatment, or reported instead by an affiliated manager — the filing does not say which · change not classifiable: value undisclosed on one side of the quarter pair, or neither shares nor value can classify it · NO CHANGE = the share count is identical in both quarters; the value moved only with price, so the row is mark-to-market and never an ADD or a TRIM (NEW / ADD / TRIM / EXIT / NO CHANGE) · NO PRIOR = this filer has no comparable holdings list for the previous quarter on record — a first filing under this registration, or a quarter reported inside an affiliated manager's filing — so the position is not called a new stake | derived by Public Filings from the published aggregate; NULL means the source did not disclose a usable value — never zero | Prev value | Curr value | Prev shares | Curr shares | Flags | |
|---|---|---|---|---|---|---|---|---|
position key pos:12331 · issuer key iss:1618 COM | TRIM | +$52.8M | −815,162 | $340M | $393M | 1,434,172 | 619,010 | |
position key pos:15789 · issuer key iss:529 CL A | NEW | +$177M | +9,363,621 | $0 | $177M | — | 9,363,621 | |
position key pos:14381 · issuer key iss:2293 ORD SHS | ADD | +$69.2M | +5,016,233 | $102M | $171M | 6,429,296 | 11,445,529 | |
position key pos:15581 · issuer key iss:2131 SHS | NEW | +$142M | +1,282,838 | $0 | $142M | — | 1,282,838 | |
position key pos:17511 · issuer key iss:963 ORD‡r | TRIM | −$93.8M | −1,965,340 | $225M | $132M | 6,280,502 | 4,315,162 | cusip-reconciled |
position key pos:11077 · issuer key iss:1690 COM SHS | TRIM | −$35.0M | −112,322 | $158M | $122M | 1,988,058 | 1,875,736 | |
position key sid:sec:prov:856d00daa392df84ca63299ef03992d5 · issuer key cusip6:36315X SPON ADR | ADD | +$1.6M | +252,010 | $72.4M | $74.0M | 2,213,169 | 2,465,179 | |
position key pos:13452 · issuer key iss:320 SPONSORED ADR | TRIM | −$3.6M | −100,000 | $69.3M | $65.7M | 1,223,767 | 1,123,767 | |
position key pos:17000 · issuer key iss:829 CL A | TRIM | −$167M | −1,907,275 | $229M | $61.8M | 2,624,751 | 717,476 | |
position key pos:11869 · issuer key iss:138 CL A | NEW | +$50.4M | +12,374,991 | $0 | $50.4M | — | 12,374,991 | |
position key sid:sec:prov:ca11044044ffdef73864119b9879be03 · issuer key cusip6:852312 COM PAR $0.01 | NEW | +$45.7M | +2,441,678 | $0 | $45.7M | — | 2,441,678 | |
position key pos:17981 · issuer key iss:1971 CL A | TRIM | −$9.3M | −468,841 | $35.1M | $25.8M | 1,147,258 | 678,417 | |
position key pos:12709 · issuer key iss:1480 CLASS A COM SHS | NEW | +$24.9M | +1,321,942 | $0 | $24.9M | — | 1,321,942 | |
position key pos:10969 · issuer key iss:1664 CL A | ADD | +$5.1M | +563,831 | $13.9M | $19.1M | 909,653 | 1,473,484 | |
position key pos:10250 · issuer key iss:1331 COM | NEW | +$16.3M | +1,365,067 | $0 | $16.3M | — | 1,365,067 | |
position key sid:sec:prov:99c6c850cf0be84f9f29483e82855151 · issuer key cusip6:55939A COM SHS | TRIM | −$11.8M | −190,033 | $27.0M | $15.1M | 1,780,649 | 1,590,616 | |
position key pos:10226 · issuer key iss:422 COM CL A | TRIM | −$13.3M | −548,946 | $24.0M | $10.7M | 993,879 | 444,933 | |
position key pos:16075 · issuer key cusip6:492327 COM | TRIM | −$9.9M | −197,124 | $16.8M | $6.9M | 823,707 | 626,583 | |
position key sid:sec:prov:e136758421745eef10e0f515e3d2331a · issuer key cusip6:698884 COM | NEW | +$6.0M | +447,878 | $0 | $6.0M | — | 447,878 | |
position key sid:sec:prov:e91f79eaf2eef531c911d747fd14cf27 · issuer key cusip6:35471R COM | TRIM | −$1.4M | −1,173,257 | $2.1M | $718K | 2,253,389 | 1,080,132 | |
| pos:12515 | EXIT‡e | −$135M | −2,782,460 | $135M | $0 | 2,782,460 | — | |
| pos:13973 | EXIT‡e | −$58.6M | −303,844 | $58.6M | $0 | 303,844 | — | |
| sid:sec:prov:04db8e230f7d6fd2ef9baff81e023a68 | EXIT‡e | −$5.2M | −59,946 | $5.2M | $0 | 59,946 | — |
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.
position matched across quarters by exact reported CUSIP over a registry gap — producer-reconciled identity, never a name match identity_reconciled_by_cusip | 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 classified_by_value · EXIT = absent this quarter: disposed, delisted, under confidential treatment, or reported instead by an affiliated manager — the filing does not say which · change not classifiable: value undisclosed on one side of the quarter pair, or neither shares nor value can classify it · NO CHANGE = the share count is identical in both quarters; the value moved only with price, so the row is mark-to-market and never an ADD or a TRIM (NEW / ADD / TRIM / EXIT / NO CHANGE) · NO PRIOR = this filer has no comparable holdings list for the previous quarter on record — a first filing under this registration, or a quarter reported inside an affiliated manager's filing — so the position is not called a new stake | derived by Public Filings from the published aggregate; NULL means the source did not disclose a usable value — never zero | Prev value | Curr value | Prev shares | Curr shares | |
|---|---|---|---|---|---|---|---|
position key pos:16314 · issuer key iss:842 COM CL B | NO CHANGE | −$10.2M | 0 | $270M | $260M | 245,829 | 245,829 |
position key pos:11906 · issuer key iss:1183 COM | NO CHANGE | −$20.7M | 0 | $189M | $168M | 87,889 | 87,889 |
position key pos:17462 · issuer key iss:2233 COM | NO CHANGE | −$23.6M | 0 | $178M | $154M | 9,511,150 | 9,511,150 |
position key pos:14538 · issuer key iss:1243 COM | NO CHANGE | −$25.5M | 0 | $110M | $84.5M | 633,877 | 633,877 |
position key sid:sec:prov:ccf3eb42d1d627002804f4dd0c518b0e · issuer key cusip6:85256A COM CL A | NO CHANGE | +$11.2M | 0 | $39.2M | $50.4M | 8,014,322 | 8,014,322 |
position key pos:17752 · issuer key iss:1831 COM | NO CHANGE | −$5.4M | 0 | $26.9M | $21.5M | 247,723 | 247,723 |
position key pos:10705 · issuer key iss:2209 COM SHS | NO CHANGE | −$36.9K | 0 | $688K | $651K | 6,152 | 6,152 |
Flags: no row carries a flag.
Newest filing in this build: 2026-07-31. Per-row filing dates are on each receipt.
Changes compare every position with a security identifier, new and exited included; holdings without one are counted, not compared. methodology §13F ↗
Reported positions — 2026-03-31
1–27 of 27 positions · $2.3B disclosed value over 27 rows · 0 undisclosed-value rowsViewThis 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
Change kind and share change are in Position changes above; Congress overlap is planned.
1–27 of 27 positions · page 1 of 1
One line per issuer, largest first; a row with no issuer key stands on its own line. Open a line for its rows as this filer reported them. The list holds every row this filer reported for the quarter. Issuer totals on the holders pages count each manager's own report once; that never removes a row here. how positions are grouped ↗
Book shape
2026-03-31 · concentration · vs tracked median · tick = median- Top-25 concentration
- 99.9%above median 80.0%
- Concentration index
- 790 bpsabove median 446 bps
- Positions with value
- 27 / 27median book 97.5 positions
Concentration uses reported 13F long value, not total assets. The index is withheld when any position lacks a value. Medians are over the 8,748 tracked filers with a 2026-03-31 book; the index median over the 8,662 with a complete book.
holdings whose <value> did not parse — retained and counted, never zero-filled: 0 · : 99.9% · integer Herfindahl–Hirschman index in basis points over disclosed position values: 790 · QoQ moves: 30
Filing history
AVAILABLE QUARTERS| Period | Source |
|---|---|
| 2026-03-31 | EDGAR ↗ |
PLANNED sector rotation · Congress overlap · signals for this filer
Complete source filings on SEC EDGAR
The complete filing on EDGAR.
The position list above is served from the published Public Filings build, each position as this filer reported it; where the page cannot embed every reported row, the list says how many it leaves out. This block is provenance, not a substitute: the filing itself is the record, and it is one click away. Public Filings decided on 2026-08-01 to serve this list from its published build; filings newer than this build are on EDGAR.
Open Madison Avenue Partners, LP's 13F filings on SEC EDGAR ↗Notes on this data
Share changes
Compare consecutive quarters
Position changes retain the producer’s classification and comparability flags. Share counts and reported values describe different changes.
Coverage
A snapshot, not current holdings
Use the quarter selector to inspect available periods. Unknown values stay unknown and each table states its coverage.
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 been changed or closed before you ever see it, and is older still by however long ago that 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 with unit_basis carried on every record.
Affiliated managers may report the same position (otherManager), 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 (ARCHITECTURE.md §5.2 / M2-CONTRACT §5).