Biotech companies topped the short-selling chart of the secondary board on Feb. 8. About KRW 70.4 billion (USD 64.7 million) worth of Celltrion Healthcare shares, or about 14% of the overall transactions, were sold short on that day. Viromed, Medytox and SillaJen were also targeted by short sellers on Feb. 8 and the day after, the report said.