No, a naked call (you don't own the underlying shares) is unlimited risk. You own the shares so it's a covered call, you would sell your shares if the stock price goes over the call strike price. Let's say you sell the May 17 $90 call for $1 so you get $100 per contract, if you sold seven of them you collect $700. If roku is over $90 when it expires, you sell 700 shares at $90. If it's below it, those calls expire worthless which is ideal for you as the seller. The only risk here is you cap your max gains from selling the stock, if you sold those calls and roku goes to $100 next week, you committed to sell at $90 so lost out selling your shares for more.