Congress trades vs corporate insider trades: what each filing tells you
By InsiderAlpha · Published
Written from SEC primary filings, with every rule cited inline. Editorial standards.
Two public filings report stock trades by people with privileged positions, and they are easy to confuse. A corporate insider reports on SEC Form 4 under securities law. A member of Congress reports on a Periodic Transaction Report (PTR) under ethics law. They are produced by different people, on different clocks, with different precision, and they answer different questions. This guide sets them side by side and explains how InsiderAlpha shows both.
| Form 4 | Congressional PTR | |
|---|---|---|
| Who files | Directors, officers and beneficial owners of more than 10% of a company's stock | Members of Congress and senior staff, reporting their own, their spouse's and their dependent children's trades |
| Law | Section 16(a) of the Securities Exchange Act of 1934 | Ethics in Government Act, as amended by the STOCK Act of 2012 |
| Deadline | End of the second business day after the trade | 30 days after notification, never later than 45 days after the trade |
| What it states | Security, shares, price per share, holdings afterwards, a transaction code | Asset name and ticker, purchase or sale, two dates, a value range |
| Whose company | The filer's own company | Any public company |
| Published by | SEC EDGAR | The Clerk of the House; the Senate's electronic filing site |
Who is filing, and why that matters
A Form 4 is filed by someone inside the company whose stock is traded: a director, a Section 16 officer or a holder of more than 10% of a class of its equity. The filer sees the company's numbers before the market does, which is the reason the report exists and the reason an open-market purchase by such a person is studied at all. Our Section 16 guide and 10% owner guide cover who qualifies.
A PTR is filed by a legislator trading someone else's company. The STOCK Act's section 4 says members "are not exempt from the insider trading prohibitions arising under the securities laws", and the report exists so the public can see the trades. The filer's relationship is to legislation, committees and briefings, not to the issuer's books. That is a different kind of information, if it is information at all, and the filing does not tell you whether it played any part.
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Speed
Form 4 has been due by the end of the second business day after the trade since the SEC's 2002 rulemaking, and in our corpus the median filing arrives two calendar days after the earliest transaction it reports (see Form 4 by the numbers). A PTR is due 30 days after the filer is notified of the trade and never later than 45 days after it. The gap is not an accident: the congressional rule is built around a filer who may not have placed the trade and may learn of it from a monthly statement. The practical result is that a Form 4 describes a price from this week and a PTR describes a price from last month. The Form 4 deadline guide and the PTR delays guide take each clock apart.
Precision
A Form 4 row gives the number of shares, the price per share (or a weighted average with a footnote giving the range), the transaction date and the holding after the trade. You can compute the dollar value and compare it with the insider's existing stake. A PTR row gives a range: $1,001 to $15,000, $15,001 to $50,000, and so on up to over $50,000,000, from the categories in 5 U.S.C. 13104(d). No shares, no price. You cannot tell a $2,000 trade from a $14,000 one, and you cannot compute a return from the filing because you do not know the entry price. The PTR reading guide lists every band.
Whose trade it is
Both forms admit that the person signing may not be the person who traded, but they handle it differently. A Form 4 marks ownership D (direct) or I (indirect) and explains an indirect holding in a footnote: a trust, a spouse, an LLC. Since 2023 it also carries a checkbox for trades made under a pre-arranged Rule 10b5-1 plan, so you can see when the insider fixed the schedule months earlier. A PTR marks SP (spouse), DC (dependent child) or JT (joint), and even that is optional under the House form's instructions. It has a notification date, which hints at a broker or adviser acting on the account, but no plan disclosure and no statement of who made the decision. A spouse's sale inside a managed account and a member's own purchase look the same on the page apart from two letters.
What gets reported
A Form 4 covers the issuer's equity in every form: open-market buys and sells, grants, option exercises, tax withholding, gifts and conversions, each with its own code. Most rows are compensation events, which is why the transaction code matters more than the headline. A PTR covers any security over $1,000 in gross value: stocks, bonds, options, futures, cryptocurrency, but by the House form's exclusions not mutual funds or ETFs, not the federal Thrift Savings Plan, and not real property. There are no compensation events to filter out, because members are not paid in the stocks they trade. There is also no A or M code to tell a decision from a mechanical event; a reinvested dividend over $1,000 shows as a purchase like any other.
Why they are different signals
An insider's open-market purchase is a decision to put personal money into a company the buyer knows from the inside. Studies of Form 4 data such as Lakonishok and Lee (2001) and Cohen, Malloy and Pomorski (2012) measured what followed such purchases across many trades, with the caveats our research guide spells out.
The research on congressional trading is thinner and contested. Ziobrowski, Cheng, Boyd and Ziobrowski (2004) built a portfolio mimicking Senators' purchases from 1993 to 1998 and measured it at 85 basis points a month above the market, with a portfolio mimicking their sales 12 basis points a month below it. Ziobrowski and co-authors (2011) applied the same method to more than 16,000 House transactions from 1985 to 2001 and measured 55 basis points a month, about 6% a year. Eggers and Hainmueller (2013) reinterpreted those studies and ran their own analysis of 2004 to 2008 trades, concluding that "in neither period do members of Congress trade with an information advantage" and that between 2004 and 2008 "the average member of Congress would have earned higher returns in a passive index fund". Three things about this literature matter for a reader of today's filings: it disagrees with itself; every sample predates the STOCK Act's 45-day disclosure, so none of it measures what a public PTR could have told anyone at the time; and all of it describes averages over thousands of trades, not the trade in front of you. None of it is a forecast, and InsiderAlpha does not compute a return since the trade for any congressional disclosure.
Reading them together
The one place the two filings meet is the company. When a member of Congress buys a stock and a director of that same company reports an open-market purchase in the same window, you have two independent decisions about one name, made by people with different information. That is a reason to open both filings, not a conclusion, and the two can just as well point opposite ways. The Congress tracker shows Form 4 open-market purchases by corporate insiders in the same company beside each ticker's congressional trades, with the dates, so you can see which came first and how far apart they were. The cluster buying guide explains why two buyers are not always two independent buyers, and the same caution applies here.
How InsiderAlpha shows both
Form 4 filings run through the filings feed and recent purchases, and the daily trading plan ranks recent insider purchases by Alpha Score. Congressional PTRs run through the Congress trades page, which lists the newest House disclosures, the tickers members bought and sold, and the most active members over the last 30 days, with a page per member. Both keep every value as the filing stated it: exact shares and prices for Form 4, ranges for PTRs, with no midpoint and no estimate. Both link to the original document, on SEC EDGAR or on the Clerk of the House's website. Congressional trades do not enter the daily trading plan and carry no score; they are a record to read, not a ranking.
Recent House disclosures → · How to read an insider purchase → · How to read a PTR →
This article is informational and is not investment advice.