SEC EDGAR Multifamily REIT Filings, Delivered as Data

"Filings" for an apartment REIT is three different artifacts wearing one word. The first is the document: the 10-K with its property-level schedules, the 10-Q, the 8-K announcing what could not wait for either. The second is the tagged fact: revenues, net income, long-term debt filed under penalty of securities law and labeled so machines can read them. The third is the sector aggregate that turns one landlord's quarter into a benchmark rather than an anecdote.

A serious answer carries all three, because desks that buy only the first discover the second missing at model-build time and the third absent at benchmark time. Datadory packages the whole stack: the catalog pools 14 datasets for this industry, three of them primary records scoped to multi-family residential REITs, and one of those scores a perfect 10 on our field-documentation rubric. The sections below walk the stack layer by layer with the verified numbers each record ships.

The anchor record is the SEC EDGAR Company Search & Filing Archive: every disclosure the six names file, searchable by company, ticker or full text. Annual 10-Ks with property schedules, quarterly 10-Qs, 8-K current reports, DEF 14A proxies and Forms 3, 4 and 5 insider transactions all hang off one registry.

Verified against Equity Residential - now Vivmark Residential after the August 18, 2026 symbol change to VMRK - the record holds up concretely. The submissions side returned 1,006 recent filings for the issuer and its operating partnership (CIK 0000906107), including eleven 10-Ks reaching back to 2015; the latest annual report landed February 13, 2026 carrying accession 0001193125-26-051433 and document eqr-20251231.htm. The company-facts side exposed 593 us-gaap concepts in roughly 4.8 MB of typed observations. And because the whole cohort resolves through one reference map holding 10,387 registered tickers, screening AVB, MAA, UDR, ESS and CPT alongside it is a filter, not a collection project - see the CIK identifier entry for why that key outlives any symbol.

Two consequences worth more than the convenience. First, point-in-time reconstruction works: when an issuer re-reports, the revised values arrive as another dated vintage instead of overwriting history, which is the difference between a backtest and a memory. Second, cross-sections come pre-built: the frames view returns a single concept across all filers for one calendar period, and the CY2025Q1 Revenues frame alone carried 1,934 facts - a peer revenue panel assembled without touching a single document.

The same record defines the universe. Its FTSE-sourced overview, dated 7/31/2026, sizes residential REITs at a 3.96% dividend yield and a 5.74% year-to-date total return against -7.43% for full-year 2025, while the directory lists 28 companies with ticker, headquarters, price and one-year return stamped to the August 21, 2026 close. Treat the counts as labeled views rather than an error: 15 in the FTSE overview, 18 cited as index-listed, 28 in the directory, because non-traded constituents live in the roster too.

When the question predates the filings era, the Nareit REIT Market Data Reports Hub carries the long run: monthly index rows spanning December 1971 through June 2026 in 664 rows across 42 columns, indexed to 100.0 exactly on December 31, 1971 - June 2026 All REITs sat at an index level of 11,717.261 on a 4.02% yield. Grain discipline applies: T-Tracker figures are sector totals across the roster, filing facts are per-issuer per-period values, and summing across the two compares different units.

Five recur wherever teams self-assemble apartment REIT data, roughly in order of damage:

1. Ticker drift. Symbols move - EQR became VMRK overnight in August 2026. Datadory keys everything on the CIK through the 10,387-ticker spine and treats symbols as display text, so a rename is a label change, not a broken join.
2. Window truncation. Roughly the last 1,000 filings per issuer surface inline; deep-history studies need the paginated archive indexes behind them. Walking those pages is our problem upstream, not your cron job.
3. Concept sprawl. 593 us-gaap concepts for one issuer means mirroring megabytes you will never model unless someone scopes the allow-list. Your sample names the concepts; the feed keeps the schema stable around them.
4. Grain splicing. Per-issuer facts, sector totals in millions, monthly index levels and quarterly vacancy rates are four grains pretending to be one table. Each record ships with its unit and period stamps intact so the layers stack without lying to each other.
5. Silent revisions. Restated quarters overwrite naive copies. Here every value keeps the accession number that reported it, so vintage analysis stays possible after the fact.

Investors and quant researchers rebuild point-in-time fundamentals from 593 concepts per issuer, benchmark each quarter against the T-Tracker instead of hand-collecting ten 10-Qs, and backtest against index returns reaching December 1971. Their workflow lives on multi family residential reits data for investors quants.

Analysts and investment bankers assemble comps from identically named concepts across the six anchors and cite the accession number behind every figure - evidence that survives diligence. Credit and fixed-income desks watch leverage and debt concepts quarter by quarter against the $1,821 million of quarterly dividends to see who funds payouts from the balance sheet. Competitive-intel teams at rental platforms track 8-K announcements and insider forms across the cohort without opening a filing reader. Journalists and academics get quotable numbers with provenance attached, and data scientists inherit flat, typed observations keyed on CIK and date - see the form 10-K entry for what the annual layer contributes.

Start with the question, then take the smallest record that answers it. A fundamentals panel wants the SEC EDGAR Company Search & Filing Archive; the sector denominator wants the Nareit Residential REIT Sector Page; multiples and yields want the quote-pages record; the long run wants the reports hub.