Thematic Investing Is Fun, But Is It Good for Investors?

There’s a Wall Street axiom that where there’s hype, there’s a ticker.

Every mania spawns its own exchange-traded fund (ETF) — a financial piñata for investors to whack in hopes of candy falling out. So it was only a matter of time before someone decided the next “you-had-to-be-there” trade wasn’t in AI, clean energy, or space tourism — but extraterrestrial life.