Tilson Urges Investors to Keep Politics Out of Portfolios

Former hedge fund manager Whitney Tilson cautions that partisan views should not drive investment decisions, citing decades of S&P 500 data.

Updated on Nov. 10, 2026 in Investing

Tilson Urges Investors to Keep Politics Out of Portfolios

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In a blog post for Stansberry Research published Nov. 4, former hedge fund manager Whitney Tilson warned investors not to let politics affect their investing. The warning follows a Democratic sweep of the U.S. House and Senate in the 2026 midterm elections and a period of increased market volatility.

Why it matters

Investors often react to election outcomes, and Tilson's charts argue that long-run S&P 500 results have not tracked the party holding the presidency. His advice centers on balancing media sources and relying on high-quality news rather than partisan narratives.

Tilson's charts compare $1,000 invested in the S&P 500 under presidencies of each party against the full 70-year period. The source does not report the specific return figures or how the presidency-by-party results were calculated.

The players

Whitney Tilson

Tilson is a former hedge fund manager who writes investment commentary and is known for his analysis of market cycles and investor behavior.

Stansberry Research

Stansberry Research is a financial publisher that produces investment newsletters and commentary for individual investors.

The details

Tilson said he regularly hears from readers who describe the economy as terrible based on who occupies the White House. He first shared the same charts in 2023, ahead of the 2024 election, and advised investors to stick to high-quality news sources and balance the media they consume.

- 2023: Tilson first shared the charts ahead of the 2024 election.
- Nov. 4: Tilson published his warning in a Stansberry Research blog post.
- 2026 midterm elections: Democrats swept the U.S. House and Senate.

Market Dynamics

Tilson republished the same presidency-by-party S&P 500 charts he first shared in 2023 ahead of the 2024 election, extending his argument that partisan control has not dictated long-run equity returns. The repetition reflects a recurring pattern of investors reacting to electoral outcomes in the U.S. stock market.

Investors who base portfolio decisions on which party holds the presidency may be reacting to a pattern Tilson's charts suggest has not held over 70 years. Focusing on long-term S&P 500 performance and diversified, high-quality news sources can help keep allocation decisions grounded in data.

The takeaway

Tilson's core point is that long-term investing outcomes have been driven by factors other than which party holds the White House, so investors benefit from balancing their news sources and avoiding political framing in portfolio decisions.