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.
MARSHFIELD ASSOCIATES
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 ↗
Period
$5.0B
reported valuesum 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
17
positionsALL retained default holdings for this (filer, period), including NULL-value ones
0
new stakespositions with no comparable holding in the prior quarter (kind new), 2026-03-31
0
exitspositions absent from this quarter's filing after being held last quarter (kind exit), 2026-03-31 — inferred from absence, not a sale record
Position changes — into 2026-03-31
by shares · Δ value · filing link · how changes are classified §Positionposition matched across quarters by exact reported CUSIP over a registry gap — producer-reconciled identity, never a name match identity_reconciled_by_cusip | Changethe reported share count is unchanged across the pair, so the position reads as held rather than as a buy or a sell; only builds before this release inferred a direction from the reported value instead 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 (Add / New / 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 | Δ valuederived by Public Filings from the published aggregate; NULL means the source did not disclose a usable value — never zero | Δ shares | Prev value | Curr value | Prev shares | Curr shares | Flags |
|---|---|---|---|---|---|---|---|---|
AUTOZONE INC COMposition key pos:15380 · issuer key iss:281 | trim | −$35.8M | −9,885 | $593M | $557M | 174,918 | 165,033 | |
UNITEDHEALTH GROUP INC COMposition key pos:17013 · issuer key iss:2218 | add | −$35.9M | +232,202 | $547M | $512M | 1,658,487 | 1,890,689 | |
PROGRESSIVE CORP COMposition key pos:12536 · issuer key iss:1764 | trim | −$88.4M | −70,350 | $575M | $487M | 2,525,734 | 2,455,384 | |
ROSS STORES INC COMposition key pos:11508 · issuer key iss:1870 | trim | −$95.0M | −895,533 | $489M | $394M | 2,714,339 | 1,818,806 | |
VISA INC COM CL Aposition key pos:13716 · issuer key iss:2278 | add | +$18.4M | +225,939 | $361M | $379M | 1,029,034 | 1,254,973 | |
OREILLY AUTOMOTIVE INC COMposition key pos:12254 · issuer key iss:1601 | trim | −$32.0M | −392,970 | $356M | $324M | 3,906,644 | 3,513,674 | |
MASTERCARD INCORPORATED CL Aposition key pos:15086 · issuer key iss:1433 | trim | −$57.9M | −26,528 | $358M | $300M | 626,682 | 600,154 | |
ARCH CAP GROUP LTD ORDposition key pos:17810 · issuer key iss:2429 | add | +$16.0M | +164,419 | $277M | $293M | 2,887,002 | 3,051,421 | |
EXPEDITORS INTL WASH INC COMposition key pos:18624 · issuer key iss:874 | trim | −$26.1M | −99,526 | $306M | $280M | 2,052,531 | 1,953,005 | |
DOMINOS PIZZA INC COMposition key pos:15780 · issuer key iss:752 | trim | −$56.3M | −29,852 | $327M | $271M | 784,992 | 755,140 | |
CUMMINS INC COMposition key pos:12244 · issuer key iss:695 | trim | −$148M | −314,867 | $390M | $241M | 763,648 | 448,781 | |
MOODYS CORP COMposition key pos:17406 · issuer key iss:1503 | trim | −$52.8M | −24,564 | $288M | $235M | 563,557 | 538,993 | |
TJX COS INC NEW COMposition key pos:18816 · issuer key iss:2073 | trim | −$5.3M | −77,699 | $180M | $174M | 1,168,859 | 1,091,160 | |
NVR INC COMposition key pos:19000 · issuer key iss:1524 | trim | −$28.3M | −1,436 | $196M | $168M | 26,855 | 25,419 | |
DISNEY WALT CO COMposition key pos:18004 · issuer key iss:742 | trim | −$34.5M | −52,465 | $193M | $158M | 1,695,189 | 1,642,724 | |
FASTENAL CO COMposition key pos:16201 · issuer key iss:898 | trim | +$3.1M | −440,308 | $150M | $154M | 3,749,595 | 3,309,287 | |
STRATEGIC ED INC COMposition key pos:15506 · issuer key iss:2047 | trim | −$52.8M | −685,592 | $119M | $65.8M | 1,478,522 | 792,930 |
Quarter ended 2026-03-31Newest filing in this build: 2026-07-31. Per-row filing dates are on each receipt.
Changes derive from the aggregate's top-25 slices and keyable positions only; unkeyable holdings are counted in the registry, not differenced. methodology §13F ↗
Book shape
2026-03-31 · concentration · vs tracked median · tick = median- Top-25 concentration
- 100.0%above median 80.0%
- Concentration index
- 708 bpsabove median 446 bps
- Positions with value
- 17 / 17median 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.
null-value positions: 0holdings whose <value> did not parse — retained and counted, never zero-filled · top-N share ·§: 100.0% · HHI (bps) ·§: 708integer Herfindahl–Hirschman index in basis points over disclosed position values · QoQ moves: 17
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 — every position this filer reported for the selected quarter, as it reported it. This block is provenance, not a substitute: the filing itself is the record, and it is one click away. Serving this list is M2-CONTRACT §3, amended 2026-08-02; §3.1 keeps live EDGAR for filings newer than this build.
Open MARSHFIELD ASSOCIATES'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.
ViewPrior quarter not yet availableThis build carries one quarter for this manager: 2026-03-31. Notable managers carry four published quarters, others two.
Reported positions — 2026-03-31
1–17 of 17 positions · $5.0B disclosed value over 17 rows · 0 undisclosed-value rowsEvery row below carries ticker not yet mapped — stated once here rather than repeated on every row.
| KindClassification is not joined into this reported-position view. Use the changed-positions view to compare the two published quarters. | TickerThis list carries reported issuer names and security identities, without a dated ticker mapping. Symbols are not inferred from names. | Issuera 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 | WeightShare of total reported value, calculated only when the full position list has disclosed values. This is 13F long value, not total assets. | Valuevalue undisclosed on the filing: retained and counted, excluded from sums, never shown as $0 | Shares | Position changeShare change is available in the separate comparison view; it is not joined into this position list. | Wt | CongressThe congressional transaction join is unavailable in this build. |
|---|---|---|---|---|---|---|---|---|
| — | AZOverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | AUTOZONE INC AUTOZONE INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $557M | 165,033 | — | 11.2% | — | |
| — | UNHverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | UNITEDHEALTH GROUP INC UNITEDHEALTH GROUP INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $512M | 1,890,689 | — | 10.2% | — | |
| — | PGRverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | PROGRESSIVE CORP PROGRESSIVE CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $487M | 2,455,384 | — | 9.7% | — | |
| — | ROSTverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ROSS STORES INC ROSS STORES INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $394M | 1,818,806 | — | 7.9% | — | |
| — | Vverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | VISA INC VISA INC · COM CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $379M | 1,254,973 | — | 7.6% | — | |
| — | ORLYverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | OREILLY AUTOMOTIVE INC OREILLY AUTOMOTIVE INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $324M | 3,513,674 | — | 6.5% | — | |
| — | MAverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | MASTERCARD INCORPORATED MASTERCARD INCORPORATED · CL A CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $300M | 600,154 | — | 6.0% | — | |
| — | ACGLverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | ARCH CAP GROUP LTD ARCH CAP GROUP LTD · ORD CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $293M | 3,051,421 | — | 5.9% | — | |
| — | EXPDverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | EXPEDITORS INTL WASH INC EXPEDITORS INTL WASH INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $280M | 1,953,005 | — | 5.6% | — | |
| — | DPZverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | DOMINOS PIZZA INC DOMINOS PIZZA INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $271M | 755,140 | — | 5.4% | — | |
| — | CMIverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | CUMMINS INC CUMMINS INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $241M | 448,781 | — | 4.8% | — | |
| — | MCOverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | MOODYS CORP MOODYS CORP · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $235M | 538,993 | — | 4.7% | — | |
| — | TJXverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | TJX COS INC NEW TJX COS INC NEW · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $174M | 1,091,160 | — | 3.5% | — | |
| — | NVRverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | NVR INC NVR INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $168M | 25,419 | — | 3.4% | — | |
| — | DISverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | DISNEY WALT CO DISNEY WALT CO · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $158M | 1,642,724 | — | 3.2% | — | |
| — | FASTverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | FASTENAL CO FASTENAL CO · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $154M | 3,309,287 | — | 3.1% | — | |
| — | STRAverified against the SEC company list on 2026-09-10 — a reviewed mapping row for this filed issuer name and class (never inferred) | STRATEGIC ED INC STRATEGIC ED INC · COM CUSIP — quarter ended 2026-03-31 filed filed 2026-05-15 +45d | $65.8M | 792,930 | — | 1.3% | — |
1–17 of 17 positions · page 1 of 1
every row this filer reported for the quarter, as it reported it — cross-filer de-duplication is applied to issuer totals elsewhere and never deletes a row here
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).