The accusation is specific, and it's the reason the STOCK Act exists: members of Congress see things before the public — classified briefings, draft legislation, agency heads-ups — and the place that edge should show up is in the industries their committees oversee. A senator on Armed Services buying a defense contractor. An Energy Committee member buying an oil major. If the inside-information story is true, those trades should beat the rest.
We can test it directly, and we test it the honest way. For every disclosed purchase back to 2017, we tag whether the stock's sector is one the buying member's committees actually oversee, then measure that trade's return over the next twelve months — not a run to today's price, which would just reward whoever bought earliest in a long bull run. A rolling 12-month window means each trade is judged against its own market: a 2018 buy carries the Q4 correction, a 2020 buy the COVID crash and rebound, a 2022 buy the bear. And we measure it against the S&P over the identical window, so "the market went up" cancels out.
The oversight edge doesn't exist
Across 3,552 purchases from 2017 to 2024, on a 12-month-forward basis versus the S&P 500:
| Trade type | Purchases | 12-mo return | vs S&P |
|---|---|---|---|
| In a sector the member oversees | 720 | +26.8% | +3.6 pt |
| In a sector they don't oversee | 2,832 | +26.0% | +2.9 pt |
The edge from committee jurisdiction is +0.7 points — statistical noise. The single most-cited mechanism for a congressional trading advantage, tested across seven years and three market downturns, produces essentially nothing. And it held up when we split it by year: in the normal years (2017–2019) the overseen trades ran a couple of points ahead; in the most recent years (2023–2024) they ran a hair behind. There's no stable jurisdiction edge in either direction.
But they do beat the market — just not because of committees
Here's the part that keeps the outrage alive: both buckets beat the S&P by roughly 3 points over the following year, in a test that already controls for the bull market. That's a small but real edge — Congress, in aggregate, is a slightly-above-average stock picker. It just has nothing to do with what they oversee. Two plainer things explain it:
- They buy what works. Their most-purchased names are the mega-cap tech and broad index funds that carried the whole market — long, popular, liquid.
- Disclosure lag flattens any real secret. A trade becomes public up to 45 days later; whatever informational edge a briefing conferred has decayed by the time anyone — including a copier — can act on it.
The uncomfortable finding for both sides of the debate: Congress's trades are genuinely a bit better than the market, and the committee-information edge — the exact thing the STOCK Act was written to stop — isn't what's producing it.
What actually predicts a good congressional copy
Not the committee. As we found scoring every member, the spread between the best and worst copy-trades is enormous, but it tracks individual picking (Tuberville's semiconductors, Fetterman's handful of winners) and plain long-tech exposure — not which subcommittee someone sits on. If you're going to follow Congress, follow the member, not the mandate. Watch the live disclosures on /congress.
Methodology: every disclosed purchase from 2017 through mid-2024 with a resolvable ticker and sector, measured over the 12 months following the transaction date against the S&P 500 over the same window (so a rising market cancels out), then averaged. A trade is "overseen" when the stock's sector appears among the sectors the member's committees have jurisdiction over. Early years carry smaller samples; the aggregate spans the 2018 correction, the 2020 crash and the 2022 bear. Not investment advice.