The Stop Trading on Congressional Knowledge Act, passed in 2012, made explicit that members of Congress and senior staff are not exempt from insider trading law, and required them to disclose securities transactions above a modest dollar threshold.
It matters because legislators routinely encounter information that moves markets before the public does — from committee briefings, from oversight of specific industries, from advance knowledge of legislation and appropriations. Whether that access is systematically exploited is disputed; that it exists is not.
The disclosure regime is considerably weaker than the corporate one. Deadlines are measured in weeks rather than the two business days a Form 4 requires, so a trade can be a month old before it surfaces. Amounts are reported in broad bands rather than exact figures, so a filing tells you a purchase fell somewhere within a wide range. Filings often cover a spouse's account. Penalties for late filing have generally been small.
So congressional disclosures are worth watching for a different reason than corporate ones: not because the timing is actionable, but because the pattern — which committees, which sectors, which members trade in the industries they oversee — is visible in aggregate even when any single filing is stale and imprecise.
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