ZipLime/corporate-actions

US Corporate Actions — dividends and splits

391 639 dividends from 3 327 filers · 5 619 splits from 3 814 filers · 2005 to 2026

Built to close a specific hole. A filing states shares and earnings per share as of the day it was made; every price series is adjusted for splits since. Multiply one by the other and the answer is wrong by the split factor — on Deckers that turned a 6.9% earnings yield into 41.7%, a P/E of 1.8.

The pipeline lives in recipe/ at the same revision as the data. See PIPELINE.md for the method.

Read this before anything else

There are no ex-dates, record dates or pay dates here, and there is no free source for them. SEC's structured data carries only numeric facts; the date-typed XBRL facts exist inside filings but not in the bulk data sets, and the XBRL API returns 404 for them. What this dataset has is what can be had from public filings: how much per share, over which fiscal period, known from when — and split ratios recovered from the trace a split leaves in restated figures.

If you need an ex-date calendar, this is not it, and nothing free is.

The adjustment factor

This is the table most people want. Multiply an as-filed per-share figure by cumulative_split_factor to put it on the same basis as a split-adjusted price series.

import polars as pl

factors = pl.read_parquet("data/adjustment_factors/*.parquet")

# Deckers: a 6-for-1 split detected between 2024-08-01 and 2024-10-31
factors.filter(pl.col("cik") == "0000910521")
# valid_from    valid_to      cumulative_split_factor  splits_after
# null          2024-10-31    6.0                      1
# 2024-10-31    null          1.0                      0

Shares outstanding filed before that window need multiplying by six; earnings per share need dividing by it. Apple carries 28.0 before its 2014 seven-for-one (7 × 4), 4.0 between the two, and 1.0 today.

Splits, and how confident to be

No free feed of US splits exists. What exists, in a dataset that keeps every filing's own version of a period, is the trace: a split forces the company to restate every earlier per-share figure by the ratio. Two filings covering the same quarter, one before and one after, differ by exactly that factor.

That is stronger than the obvious signal. A jump in shares outstanding looks identical for a two-for-one split and an equity raise that doubled the count; only a split reaches back and rewrites the past.

Confidence	Rows	What it means
high	514	the filer tagged the conversion ratio, or both methods found it
medium	3 728	inferred from four or more restated figures
low	1 377	inferred from two or three

Verified against the ratios filers tagged themselves: the two methods agree for 73% of the companies where both exist, and the inferred method reaches seven times as many companies.

Each split carries a window, not a date: detected_after is the last filing that still used the old figures, detected_before the first that used the new. Deckers' September 2024 split lands in 2024-08-01 → 2024-10-31. That is as precise as filings allow, and a date invented inside that window would be a fiction.

Reverse splits outnumber forward ones almost three to one — 3 933 to 1 686 — which is what the SEC filer universe actually looks like once you leave the index names: shells consolidate to keep a listing far more often than successful companies split.

Dividends

Per-share amounts as filings stated them, for a fiscal period.

declared	276 299 — a decision made in the period
cash_paid	115 340 — cash that moved in the period
common / preferred	369 413 / 22 226
restated later	223 583 rows are a second or later report of the same period
subsequent events	769 declared after the period closed, disclosed in the filing that follows

Declared and paid are kept apart rather than merged: they are different facts, and a company can declare in one quarter and pay in the next. Preferred dividends are included because a preferred coupon ranks ahead of the common holder, and a yield computed without it is wrong for exactly the companies where it matters.

period_start is derived from period_end and quarters; a dividend fact dated to an instant is dropped rather than assigned a day it did not cover.

Configs

Config	Rows	What one row is
dividends	391 639	one per-share dividend a filing stated for one period
splits	5 619	one split, with the window it must have happened in
adjustment_factors	9 433	one span and the factor that puts an as-filed figure on today's basis
pit	397 258	one point-in-time action event, plus a Delta table for ziplime

entity_id in pit is the issuer CIK, the same key used across the family, so this joins directly to company-fundamentals, insider-trading and security-master.

Known gaps

• No dividend dates. See above. The period is the finest granularity available.
• A split window is a window. Typically one quarter wide.
• Splits before 2009 are not visible. The restatement trace needs XBRL, and XBRL starts in 2009 Q1. A company that split in 2006 shows no split here.
• Stock dividends under 18% are not detected. A five percent stock dividend and a five percent restatement leave the same trace, so nothing between 0.85 and 1.18 is admitted as a split rather than risk phantom factors.
• Special and irregular dividends are not separated from regular ones. The filing usually does not distinguish them either.
• Low-confidence splits are published, not hidden. Filter on confidence if a wrong factor would be worse than a missing one.

Provenance and updates

Derived entirely from ZipLime/company-fundamentals, which is itself SEC XBRL — US Government work, public domain. No source of its own is fetched.

Rebuilt weekly, Monday 08:10 UTC, after the dataset it reads.