# Do Politicians Beat the S&P 500? What the Data Shows

Source: https://cluenex.com/learn/markets/politicians-stock-portfolios-actually-beat-s/
Publisher: Cluenex (https://cluenex.com)
Updated: 2026-10-19

## Short answer

Across modern academic studies, the average member of Congress does not beat the S&P 500. Post-STOCK Act research shows typical lawmaker portfolios match or underperform broad market index funds by 2% to 3% annually. Viral exceptions largely reflect concentrated high-beta technology holdings and survivorship bias rather than systematic legislative trading skill.

## Key takeaways

- Early studies from 1985 to 2001 reported abnormal returns of 6% to 12%, but modern studies examining complete portfolios show politicians underperform broad market index funds by 2% to 3% annually.
- Viral social media trackers suffer from survivorship bias, spotlighting a few lawmakers whose heavy tech exposure outperformed during a mega-cap rally while ignoring dozens of underperforming peers.
- Under the 2012 STOCK Act, lawmakers face a 45-day reporting window, but filings show long lags that eliminate any copy-trading edge for outside investors.
- Academic research detects localized advantages only among committee leaders trading stocks directly inside their legislative jurisdiction, not rank-and-file members.

## What early research found about congressional stock trading

Early academic studies suggested that members of Congress possessed a major informational advantage over ordinary investors. A landmark 2004 study by Alan Ziobrowski and colleagues in the *Journal of Financial and Quantitative Analysis* examined U.S. Senate disclosures from 1993 to 1998. The researchers constructed calendar-time portfolios that mirrored Senate transactions and found that senators' common stock purchases outperformed the broader market by approximately 12.3 percentage points per year.

Seven years later, the same research team published a follow-up study analyzing U.S. House of Representatives trades from 1985 to 2001. That paper analyzed more than 16,000 transactions across roughly 300 representatives and identified an average abnormal return of approximately 6% per year. In both chambers, purchases appeared to beat market benchmarks while sales underperformed, suggesting lawmakers had uncanny timing on both sides of the trade. These findings formed the empirical backbone of the public conviction that politicians routinely use confidential briefings to enrich their private brokerage accounts.

## Why modern studies show politicians trail the market

Subsequent research re-examined these claims with larger datasets, better risk-adjustment models, and full portfolio holdings rather than isolated transactions. In 2013, political scientists Andrew Eggers and Jens Hainmueller published an analysis in *The Journal of Politics* covering congressional disclosures from 2004 to 2008. Instead of assuming equal trade sizing, they reconstructed the actual stock portfolios held by lawmakers.

Eggers and Hainmueller discovered that the average member of Congress actually underperformed a passive market index by 2% to 3% annually. Looking at whole balance sheets revealed that lawmakers suffered from the same behavioural mistakes as typical retail investors: holding stagnant positions too long, chasing recent past performance, and paying high transaction frictions. The authors concluded that the average lawmaker would have accumulated more wealth by abandoning individual stock picking and placing their money in a passive index fund.

Following the enactment of the Stop Trading on Congressional Knowledge (STOCK) Act of 2012, researchers gained access to transaction-level data filed in near real time. A 2022 study by William Belmont, Bruce Sacerdote, Ranjan Sehgal, and Ian Van Hoek in the *Journal of Public Economics* evaluated post-STOCK Act transactions from 2012 to 2020. They found that lawmakers' stock purchases earned zero abnormal returns on average after controlling for standard risk factors. A companion National Bureau of Economic Research working paper by Haotian Chen and Bruce Sacerdote documented that congressional trades look almost identical to uninformed retail trading, with lawmakers routinely trading in the direction of publicly available Wall Street analyst consensus rather than private legislative intelligence.

| Study | Sample Period | Sample Analyzed | Key Finding |
| :--- | :--- | :--- | :--- |
| Ziobrowski et al. (2004) | 1993 to 1998 | U.S. Senate purchases and sales | +12.3% annualized abnormal return |
| Ziobrowski et al. (2011) | 1985 to 2001 | U.S. House transactions | +6.0% annualized abnormal return |
| Eggers & Hainmueller (2013) | 2004 to 2008 | Entire Congressional portfolios | -2.0% to -3.0% annualized vs passive index |
| Belmont et al. (2022) | 2012 to 2020 | Post-STOCK Act trade disclosures | No statistically significant abnormal return |

## Why viral social media accounts claim Congress always wins

If the academic data shows no aggregate edge, why does the broader public believe politicians beat Wall Street every year? The discrepancy comes down to two statistical realities: survivorship bias and market beta.

There are 535 voting members in the United States Congress, many of whom have spouses who manage active accounts. Across hundreds of thousands of transactions, simple statistical variation guarantees that a handful of accounts will post eye-popping returns in any given calendar year. Social media tracker accounts routinely highlight the top handful of performers, such as accounts heavy in mega-cap technology or semiconductor options, while ignoring the dozens of members who underperformed cash or sustained heavy capital losses.

Much of the apparent outperformance is market beta rather than genuine alpha. When a prominent lawmaker or spouse purchases heavily in mega-cap technology companies that dominate the S&P 500, the resulting returns look extraordinary in bull markets. However, outperforming the benchmark by concentrating in high-volatility, high-growth technology shares is an expression of risk tolerance, not non-public policy insight. When technology stocks drop, those same high-profile portfolios decline faster than the index.

To see how basic asset allocation beats individual stock picking over long horizons, read our guide on [index funds vs picking your own stocks](/learn/portfolio-management/index-funds-vs-stock-picking/).

## The mechanics of the STOCK Act and disclosure delays

The 2012 STOCK Act requires lawmakers to submit a Periodic Transaction Report (PTR) within 30 days of becoming aware of a trade, and no later than 45 days after the transaction takes place. In addition, lawmakers do not report exact dollar figures; they report broad valuation bands, such as $1,001 to $15,000, $15,001 to $50,000, or $100,001 to $250,000.

These reporting mechanics make copy-trading congressional disclosures largely ineffective for outside investors. According to [congressional stock trading data](/learn/data/congress-trading/), transactions face a 23 (Cluenex data, https://cluenex.com/learn/data/congress-trading/) from trade date to public disclosure, with a 5% (Cluenex data, https://cluenex.com/learn/data/congress-trading/). A fine for filing late is often as low as $200, which provides little deterrent against chronic reporting lags.

By the time an outside retail investor reads a disclosure 40 to 60 days after the execution date, the market has already absorbed whatever catalyst existed. In contrast, corporate corporate executives must file SEC Form 4 disclosures within two business days. To learn how corporate officer disclosures differ from legislative reports, review our guide on [reading Form 4 insider trading signals](/learn/fundamental-analysis/insider-trading-signals/).

At [Cluenex](https://cluenex.com), congressional trade data is transcribed directly from official House and Senate disclosure portals to show members' transactional records alongside valuation metrics, without treating political purchases as standalone buy signals.

## When political trading does show an informational edge

While the average rank-and-file politician generates no persistent excess return, researchers have discovered localized areas where political information creates measurable edges.

A 2023 working paper by Shang-Jin Wei and Yifan Zhou examined congressional transactions from 1995 to 2021. They found that while rank-and-file lawmakers showed no stock-picking skill, committee chairpersons and senior party leaders achieved substantial abnormal returns. Legislative power concentrates inside specific committees, granting senior leaders direct access to draft legislation, procurement budgets, and regulatory testimony before the public sees it.

Similarly, a 2024 analysis of post-STOCK Act committee jurisdictions found that lawmakers selling shares in industries governed by their own committees avoided significant market downturns. The study identified an abnormal sell spread of 7.23% over 20 trading days for jurisdiction-specific sales, particularly in the House of Representatives where committee assignments are highly specialized. Informed trading in Congress appears primarily as loss avoidance by a small cluster of powerful committee leaders, rather than profitable broad-market buying across the full legislative body.

Investors researching companies subject to heavy regulatory oversight can track objective fundamental health across [Cluenex stock pages](https://cluenex.com/glossary/), which evaluate business quality on a 0 to 10 scale across profitability, moat, growth, and balance sheet strength.

## What this means for you

If you manage your own portfolio through a standard brokerage account, tracking politicians requires healthy skepticism. The academic consensus provides several practical lessons:

1. Avoid copy-trading congressional filings: By the time a trade appears on a public Periodic Transaction Report, the stock has traded for an average of six to seven weeks. Any informational advantage or short-term catalyst has already played out.
2. Do not mistake high beta for insider knowledge: When high-profile politicians beat the market, their gains usually stem from concentrated exposure to large-cap technology stocks and call options during tech bull markets. Holding concentrated volatile stocks creates high returns in up years and severe drawdowns in down years.
3. Discount sensational social media trackers: Online accounts highlight viral winning trades to attract followers while ignoring the hundreds of congressional trades that lose money or trail the index.
4. Focus on verifiable fundamentals: Sustainable investing success relies on business valuation, corporate earnings, balance sheet debt, and competitive moats rather than copying delayed disclosures from political figures.

## Questions people ask

### Why do people think politicians beat the stock market?

Public belief stems from early academic studies covering the 1980s and 1990s, combined with modern viral social media trackers that highlight isolated tech winners while ignoring the majority of trades that underperform.

### What did the 2012 STOCK Act change for congressional trading?

The STOCK Act explicitly banned insider trading on non-public legislative knowledge and created Periodic Transaction Reports requiring lawmakers to disclose stock transactions within 45 days.

### Can retail investors make money by copy-trading politicians?

Academic studies show copy-trading fails because disclosures arrive with a median delay of several weeks, long after any news catalyst has been priced in by the market.

### Do any specific politicians actually generate market-beating returns?

Research indicates that committee chairs and senior leadership sometimes demonstrate timing edges or loss avoidance in industries directly overseen by their committees, but rank-and-file members do not beat the market.

## Sources

- [Capitol Losses: The Mediocre Performance of Congressional Stock Portfolios](https://www.journals.uchicago.edu/doi/10.1017/s0022381613000194)
- [Do Senators and House Members Beat the Stock Market? Evidence from the STOCK Act](https://www.sciencedirect.com/science/article/pii/S0047272722000044)
- [Capital in the Capitol: Congressional Trades Resemble Uninformed Retail Trading](https://www.nber.org/papers/w31976)
- [Stop Trading on Congressional Knowledge (STOCK) Act of 2012](https://www.congress.gov/bill/112th-congress/senate-bill/2038)

Cite as: Cluenex. "Do Politicians Beat the S&P 500? What the Data Shows." Cluenex Learn, updated Oct 19, 2026. https://cluenex.com/learn/markets/politicians-stock-portfolios-actually-beat-s/