Are senators required to disclose stock trades?

Yes. The STOCK Act (Stop Trading on Congressional Knowledge Act), signed in 2012, requires US senators and members of Congress to publicly disclose stock trades over $1,000 within 45 days of the transaction.

Where does Capitol Gains get its data?

All data is sourced from official US Senate financial disclosure filings available at efdsearch.senate.gov. Capitol Gains aggregates and indexes these public records to make them searchable in real time.

How often is Senate stock trade data updated?

Capitol Gains checks for new Senate disclosures multiple times per day and indexes them as soon as they become publicly available on the official Senate disclosure portal.

Which senators trade stocks the most?

Trading activity varies by senator and year. Capitol Gains tracks all active traders. Visit capitalgains.app to see the most recent disclosures sorted by activity.

Is it illegal for senators to trade stocks?

It is legal for senators to trade stocks, but it is illegal to trade on material non-public information obtained through their official duties. The STOCK Act makes this explicit and requires public disclosure of all trades.

What is the penalty for senators who fail to disclose trades on time?

The current penalty for late STOCK Act disclosure is $200 — widely criticized as too low to be a meaningful deterrent. Capitol Gains tracks disclosure dates so you can see which trades were filed late.

Strategy · 5 min read

Senate Cluster Buys: When 3+ Senators Buy the Same Stock

A single senator buying a stock is noise. Three senators independently buying the same stock within 90 days is a signal. Here's what cluster buys are, why they happen, and what retail investors can do with this information.

Capitol Gains Research·March 31, 2026

The STOCK Act database contains thousands of individual trades filed by 100 US senators. Most of them are unremarkable — a senator buying index funds, rebalancing a portfolio, following the same macro trends that any informed investor would follow.

But occasionally something different happens: multiple senators, from different parties, on different committees, independently disclose purchases of the same stock within a short window. This is what we call a cluster buy — and it's one of the most interesting signals in the entire dataset.

Why Cluster Buys Happen

There are three explanations for why multiple senators buy the same stock independently:

1. Shared macro conviction. Senators are immersed in economic data, Fed briefings, and committee hearings that most investors never see. If multiple senators conclude that semiconductor stocks are poised for growth, it might reflect a shared understanding of upcoming policy or regulatory tailwinds — not coordination.

2. Committee overlap. Senators on the same committee often receive the same briefings and develop the same sector views. Three senators on the Armed Services Committee buying the same defense contractor isn't necessarily suspicious — but it is informative.

3. Momentum following. Some senators may notice that colleagues have disclosed trades (which become public after 45 days) and decide to follow. This is legal and happens more than you'd think.

The Signal

Stocks with 3+ senators buying within a 90-day window have historically outperformed the S&P 500 in the following 6 months more often than not — though past results are not predictive.

Real Historical Examples

Looking back at the STOCK Act data, there are several notable cluster buy patterns. In late 2020, multiple senators disclosed purchases in pharmaceutical companies in the months leading up to the FDA's vaccine approval timeline — a regulatory process they had unique visibility into through committee work.

In 2022, multiple senators on technology-adjacent committees disclosed buys in semiconductor stocks ahead of the CHIPS Act passing — legislation they were actively working on at the time.

In each case, the cluster buy wasn't a guarantee of stock performance. But it was a signal that well-informed people saw something worth owning in that sector.

What This Means for Investors

Cluster buys are most useful as a sector confirmation signal, not a stock-picking tool. If three senators buy $LMT (Lockheed Martin) and you were already considering defense exposure in your portfolio, that's a meaningful data point. It doesn't mean you should immediately buy — the 45-day disclosure lag means the market may have already reacted.

The more useful question is: what does the cluster buy tell you about the sector? Multiple senators buying defense stocks might tell you more about expected defense budget increases than about $LMT specifically.

The Limits of This Data

Cluster buys are not predictive in any reliable statistical sense. The dataset is small — 100 senators making a few dozen trades each per year isn't enough to establish ironclad patterns. The 45-day lag means you're always seeing data from 6 weeks ago. And some cluster buys are simply coincidental.

This is why Capitol Gains presents the data as a transparency tool, not a trading signal. The goal isn't to help you copy-trade senators. It's to give you the same information that well-connected investors already have access to, the moment it becomes legally available.

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