oxfordledge-edgar

Battle-tested SEC EDGAR Form 4 + 13F parsers, MIT-licensed.

Extracted from the production parser at oxfordledge.com — 238,825 Form 4 insider transactions parsed across 2,963 tickers with 0 failures, 115K+ filings indexed since 2026-04.

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Why this exists

SEC EDGAR Form 4 (insider transactions) and 13F (institutional holdings) parsers are everywhere — most of them are buggy, abandoned, or quietly drop edge cases. The Oxford Ledge production parser has been running at scale for months with a hand-corrected fixture corpus covering:

• Open-market buys/sells (codes P / S)
• Stock awards (A) — often missing transactionPricePerShare
• Tax-withholding events (F) — easy to mis-classify as sells
• Gifts (G) — same edge case as awards
• Indirect ownership (directOrIndirectOwnership = "I") with footnote refs
• Multi-line filings (one filer × multiple transactions)
• Derivative + non-derivative tables on the same filing
• Officer + director + 10-percent-owner combinatorics
• 4 historical bad-date corrections; 44 impossible-price nullifications

This package is that parser, extracted with the bare minimum vendored dependencies (stdlib only — no requests, no httpx, no lxml).

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Install

pip install oxfordledge-edgar

Python 3.10+. No runtime dependencies.

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Usage

Form 4 — parse a single filing

from oxfordledge_edgar import EdgarFetcher, parse_form4

fetcher = EdgarFetcher(user_agent="YourCompany research@yourcompany.com")
xml = fetcher.get_text("https://www.sec.gov/Archives/edgar/data/320193/000032019325000045/wf-form4_173456.xml")

transactions = parse_form4(xml)
for t in transactions:
    print(t.insider_name, t.transaction_code, t.shares, t.price_per_share)

Each Form4Transaction is a frozen dataclass:

@dataclass(frozen=True)
class Form4Transaction:
    accession: Optional[str]
    issuer_cik: Optional[str]
    insider_name: Optional[str]
    insider_title: Optional[str]
    is_director: bool
    is_officer: bool
    is_ten_percent_owner: bool
    transaction_date: Optional[date]
    transaction_code: Optional[str]   # P, S, A, F, G, M, etc.
    shares: Optional[float]
    price_per_share: Optional[float]
    transaction_value_usd: Optional[float]
    shares_owned_after: Optional[float]
    direct_or_indirect: Optional[str]  # "D" | "I"
    is_open_market: bool               # True iff code in {"P", "S"}

13F — parse an institutional holdings table

from oxfordledge_edgar import parse_13f_infotable

xml = fetcher.get_text("https://www.sec.gov/Archives/edgar/data/.../infotable.xml")
holdings = parse_13f_infotable(xml)
for h in holdings:
    print(h.issuer_name, h.cusip, h.shares_or_units, h.value_usd)

Holding dataclass:

@dataclass(frozen=True)
class Holding:
    cusip: Optional[str]
    issuer_name: Optional[str]
    title_of_class: Optional[str]
    value_usd: Optional[int]            # already in dollars (not thousands)
    shares_or_units: Optional[int]
    sh_or_prn: Optional[str]            # "SH" (shares) | "PRN" (principal)
    put_or_call: Optional[str]          # for derivatives
    investment_discretion: Optional[str]
    voting_authority_sole: Optional[int]
    voting_authority_shared: Optional[int]
    voting_authority_none: Optional[int]

Rate limiting (respect SEC's 10-qps cap)

from oxfordledge_edgar import EdgarFetcher

# Default: 8 qps (under SEC's published 10 qps cap, leaves headroom).
# Adjust if you have a documented arrangement with the SEC for higher.
fetcher = EdgarFetcher(
    user_agent="YourCompany research@yourcompany.com",
    qps=8,
)

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What this package does NOT do

• Does not maintain a CIK database. Pass URLs / accession numbers; CIK lookup is your caller's responsibility (use SEC's https://www.sec.gov/cgi-bin/browse-edgar?action=getcompany or vendor a cached CIK→ticker map).
• Does not store anything. parse_form4(xml) returns dataclasses. Persistence is your caller's responsibility.
• Does not handle SEC outages or 429s with retries. The EdgarFetcher raises a clean urllib.error.HTTPError; your caller decides retry policy.
• Does not parse 8-K, 10-K, 10-Q, SC 13D/G, NPORT-P, or other filing types. Form 4 + 13F only in v0.x. Future major versions may add more filing types under the same package.

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Schema versions targeted

• Form 4: SEC's 2018+ XML schema (<ownershipDocument> root). Earlier filings used a different format; this parser does not handle them.
• 13F: SEC's informationtable XML schema (post-2010 13F-HR filings).

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Compliance notes

SEC EDGAR access requires a proper User-Agent header per their Fair Access policy. The example above shows the recommended format: YourCompany research@yourcompany.com. Failing to provide a real contact will get your IP blocked.

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Contributing

Issues and PRs welcome. Please include a fixture XML file + expected parsed output for any edge case you're reporting.

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License + attribution

MIT License — see LICENSE.

This package is maintained by Oxford Ledge, the independent equity research platform for self-directed investors. If you build something useful with this, a "Powered by Oxford Ledge" link in your README or about page is appreciated but not required.

Disclaimer

This software is provided "as is", without warranty of any kind, under the MIT License (see LICENSE). It is a developer tool for accessing and parsing financial data. It is not investment, financial, legal, or tax advice, and nothing it returns is a recommendation to buy, sell, or hold any security. Data may be incomplete, delayed, or inaccurate. You are responsible for independently verifying anything you rely on and for your own investment decisions.

Contributions

By submitting a pull request or patch, you agree your contribution is licensed under the same MIT License as this project (inbound = outbound).