The commercial space sector is one of the most volatile themes in the market. Because space stocks often move up and down together, thanks to macro liquidity, launch successes, or sector-wide risk-on sentiment, how an ETF constructs its holdings matters significantly.
Different space-focused ETFs offer different edges and also weaknesses versus their peers. That beauty, or lack thereof, is in the eyes of the beholder. It often comes down to how concentrated an ETF is. In other words, how few stock holdings it includes. Here are four ETFs I am comparing below: