Aruba Networks, a wireless networking-equipment company, seems ready to rally. Though heavily shorted, the stock is up 30% this year, and could go higher still when it reports fourth-quarter earnings at 5 p.m. today.

Katherine Fogertey and John Marshall, Goldman Sachs’s influential derivatives strategists, are telling clients to buy Aruba’s February $24 calls to position for the company to report better-than-expected financial results. The calls cost $1.25 when the stock was at $24.16.

Normally speculating with options that expire in two days on a heavily shorted stock is not the kind of trade idea you’ll find in this column. But …