Why the difference? Part of the reason is that the Invesco Momentum ETF is a long-only portfolio—it has no short bets that can go against it. The rest of the difference can be attributed to the timing and frequency of its rebalances: The Invesco Momentum ETF rebalanced only twice a year in March and last September, while the earlier-mentioned long-short strategy does it quarterly, the latest ones in February and last November.
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$4.95 commission applies to online U.S. equity trades in a Fidelity retail account only for Fidelity Brokerage Services LLC retail clients. Sell orders are subject to an activity assessment fee (from $0.01 to $0.03 per $1,000 of principal). Other conditions may apply. See Fidelity.com/commissions for details. Employee equity compensation transactions and accounts managed by advisors or intermediaries through Fidelity Clearing & Custody Solutions® are subject to different commission schedules.
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Few professional investment managers make use of momentum investing, believing that individual stock picking based on an analysis of discounted cash flows and other fundamental factors tends to produce more predictable results, and is a better means of beating index performance over the long term. "As an investment strategy, it’s a thumb in the eye of the 'efficient market hypothesis' (EMH), one of the central tenets of modern finance," to quote a UCLA Anderson Review article, "Momentum Investing: It Works, But Why?" published on Oct. 31, 2018.