Offering a price momentum investment strategy applied to mid-caps, the Invesco S&P MidCap Momentum ETF (NYSEARCA: XMMO ) has some similarities seen in some of the more aggressive funds covering the category: a growth portfolio with above-average volatility. WithAnalyst’s Disclosure:I/we have no stock, option or similar derivative position in any of the companies mentioned, and no plans to initiate any such positions within the next 72 hours. I wrote this article myself, and it expresses my own opinions. I a ...