Stock market, ETFs, bonds, and investment strategies
An engineer's guide to SEC Form 4: who files it, the two-business-day deadline, transaction codes, the short-swing profit rule, and how to read insider-transaction data without misreading the signal.
Form 25 ends the exchange listing; Form 15 ends the reporting obligation that makes a company go dark. An engineer's guide to the variants, holder thresholds, the 90-day window, and what it means for shareholders.
Form 144 is a notice of intent to sell restricted or control securities under Rule 144 - not proof a sale happened. An engineer who built an EDGAR aggregator breaks down the thresholds, the five conditions, and why Form 144 is misread.
Form 8-A is the quiet filing that lets a stock list on the NYSE or Nasdaq. An engineer who built a SEC EDGAR aggregator explains what it is, how to find it, and why it is a load-bearing data signal.
Form S-1 is the registration statement domestic US companies file before an IPO. An engineer who aggregates SEC EDGAR data breaks down its structure, the risk-factors section, and how to pull it from the free SEC API.
An engineer's guide to SEC Schedule 13D and 13G beneficial ownership filings: the 5% trigger, active versus passive disclosure, the 2024 deadline overhaul, and the structured-data mandate.
An engineer's walk through the SEC Form 10-Q quarterly report: its two-part structure, filing deadlines, XBRL tagging, and how it differs from the annual 10-K.
The final prospectus is the receipt with real prices filled in. Here's what each SEC Form 424B subtype means, from an engineer building on EDGAR.
Form 13F is the SEC's quarterly window into what large institutional managers hold. An engineer building a SEC EDGAR aggregator on what 13F really contains, the 45-day lag, the missing shorts, and the 2023 dollars-not-thousands change that silently breaks datasets.
Form SD carries two unrelated Dodd-Frank mandates — conflict minerals (Section 1502) and resource extraction payments (Section 1504). An engineer's guide to who files, the XBRL exhibit, deadlines, and aggregation pitfalls on SEC EDGAR.
Form N-PX captures every proxy vote registered funds cast each year. The 2022 amendments turned it into structured XML. Here's what engineers and investors need to know.
An engineer's walkthrough of SEC Form 8-K — the real-time material event disclosure that drives most after-hours stock moves on US equities. Notes from aggregating 3,400+ tickers on FinanceTrackDaily.