Bought HEK calls

Bought HEK Sep 17 $2.50 calls for $3.83. The stock is currently trading for $6.28. If exercised, these calls would make HEK 4% of my portfolio at a net buy price of $6.33. The net buy price is about the same as it would be if I bought it now, but my investing has a more defensive posture right now and this strategy reduces my risk exposure. That is, is HEK drops to zero I will have lost "only" $3.83 per share rather than $6.28.