OMER short volume on 5/15 = 5,648,408 shares, up 400k+ shares from 4/30
It's interesting to note that the OMER shorts were swimming upstream from 5/1 to 5/15. While they were shorting an additional 400k+ shares, OMER's share price ROSE 23% from $4.03 to $4.96.
During that period the daily average trading volume was 255k shares. Since then, it's been 268k/day, a modest increase ...... 13k difference/day certainly can't have eroded the short total by much. In fact, the TOTAL trading volume since 5/15 has been about 1.9 million shares or about 1/3 of the 5/15 short position.