Shares of Roku (NASDAQ: ROKU) are positive on the session, up over 1%, after Needham & Company affirmed ROKU's 'Buy' rating and $50 price target while offering strong cautionary commentary to short-sellers of the company.

Analyst Laura Martin identifies multiple potential upside catalysts for ROKU shares into the company's 4Q17 earnings report on February 21st, that could result in management "over-delivering guidance." Martin's upside catalysts for ROKU include:

1. Potential for 1Q18 guidance boost on Feb 21st
2. Recent headlines point to improving strategic position
3. Management executing on improving competitive moats
4. Addition to indices in 2018, requiring passive money to purchase ROKU for the first time
5. Current valuation at 7x EV/Revenue is inexpensive relative to Netflix (NASDAQ: NFLX) at 10x EV/Revenue
6. Anticipate ROKU will attract M&A interest from larger companies over time

Martin refers to these catalysts as drivers for her strong cautionary commentary to short-sellers of ROKU, suggesting "shorts should cover now" ahead of the 4Q17 earnings report. ROKU maintains roughly 15 million shares in the public float, yet shorts have established bearish positions of 7.7 million shares, with average volume traded at 10 million shares per day.

In the note, Martin also acknowledges her clear preference for ROKU moving forward, saying "we prefer ROKU to Netflix since Disney (NYSE: DIS), Google (NASDAQ: GOOG), Amazon (NASDAQ: AMZN) launching new over-the-top services helps ROKU but hurts NFLX." Martin's outlook only underscores the potential peril and risk ROKU short-sellers potentially face, heading into the 4Q17 earnings announcement.

The reiterated price target represents 25% upside from Thursday's close.

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