Ryufin research
Open data
The tables behind our studies, built from what companies file with the SEC. Free to use, share and adapt under CC BY 4.0: credit Ryufin and link the study the data comes from.
Five-year change in share counts, 2026
Diluted weighted-average shares, split-adjusted, in the latest fiscal year and five years before, with the change, for US-GAAP filers worth $2B or more.
1,276 companies · JSON · CC BY 4.0 · the study
Effective tax rates of US companies, three fiscal years to 2026
Income tax expense over pretax income over three fiscal years, with the current (non-deferred) rate, for profitable US-GAAP filers worth $2B or more; REITs and partnerships left out.
1,168 companies · JSON · CC BY 4.0 · the study
Where the cash went, 2026
Each company's latest fiscal year of operating cash flow, capital spending, dividends and buybacks, from its SEC cash flow statement. Non-financial US-listed companies worth $2B or more.
1,173 companies · JSON · CC BY 4.0 · the study
Insider buying and selling, twelve months to October 2026
Open-market purchases and sales by directors, officers and 10% owners from Form 4 filings, with the number of buyers and sellers and the share of selling under 10b5-1 plans.
1,713 companies · JSON · CC BY 4.0 · the study
Earnings-day stock moves, 2023 to 2026
The two-day price move around each of a company's last twelve earnings releases (8-K item 2.02), its ordinary two-day move, the ratio of the two and how often the price rose.
1,536 companies, 17,998 reports · JSON · CC BY 4.0 · the study
Major customers of US-listed companies, 2026
Every customer behind 10% or more of revenue that a company discloses in its latest 10-K, 20-F or 40-F, with the share of revenue and a link to the filing.
3,049 annual reports · CSV · CC BY 4.0 · the study
Programs and assistants can also query company data directly through the Ryufin MCP server.