The Stop Trading on Congressional Knowledge Act — the STOCK Act — is a United States federal law enacted on April 4, 2012. It was passed with rare bipartisan speed after public reporting drew attention to the possibility that members of Congress could profit from non-public information they encounter through their official work. The law does two central things: it affirms that federal insider-trading prohibitions apply to members of Congress and their staff, and it requires them to publicly disclose their securities transactions quickly enough that the public and press can scrutinize them.
What the STOCK Act actually prohibits
Before 2012 there was genuine legal debate about whether classic insider-trading law reached information that a legislator learns in the course of governing — briefings, pending legislation, or regulatory decisions that could move a stock. The STOCK Act settled that debate by stating explicitly that members of Congress are not exempt from the securities laws and owe a duty arising from their position of trust. Trading on material, non-public information obtained through official duties is prohibited.
The disclosure rule most people mean by "the STOCK Act"
In everyday use, when people talk about "STOCK Act filings" they mean the transparency requirement. Members must file a Periodic Transaction Report (PTR) disclosing any purchase, sale, or exchange of stocks, bonds, or other covered securities above $1,000. The disclosure must be filed within 45 days of the transaction, and it covers not only the member but also transactions by a spouse or dependent child. These reports are what power sites like this one: they are the public record of what lawmakers are buying and selling.
Who has to comply
All 535 voting members of Congress — 435 members of the House and 100 Senators — are covered, along with many senior congressional staff and certain executive-branch officials. Filings are submitted through the Clerk of the House's financial-disclosure system and the Senate's electronic filing system, then made available to the public.
Why amounts are reported as ranges
A quirk that surprises many first-time readers: lawmakers report the value of a trade as a bracket rather than an exact figure — for example "$1,001–$15,000" or "$50,001–$100,000." This is by design in the disclosure forms. It means aggregate "volume" figures on any tracker, including this one, are estimates built from the midpoints or bounds of those ranges, not precise dollar amounts.
Enforcement and the ban debate
Critics argue the STOCK Act is under-enforced: the standard penalty for a late filing is only $200, and disclosure happens after the fact rather than before a trade. That has fueled repeated proposals to go further and ban members of Congress from trading individual stocks altogether, or to require assets to be held in blind trusts. Those proposals remain debated and, so far, unpassed — which is precisely why public, searchable disclosure remains the primary accountability mechanism today.
Frequently asked questions
When did the STOCK Act take effect?
The STOCK Act was signed into law on April 4, 2012. Its disclosure requirements for periodic transactions took effect later that year, and the online-database provisions were phased in afterward.
Does the STOCK Act ban members of Congress from trading stocks?
No. The STOCK Act does not ban trading. It clarifies that insider-trading law applies to Congress and requires timely public disclosure of trades. Several later proposals have sought an outright ban, but as of now none has become law.
What is the penalty for filing a trade late?
The standard late-filing fee is $200 per report. Ethics committees can waive it, and the modest size of the fee is a common criticism of the law's enforcement.
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