Pershing Gold Corp fka PGLC

[someconcerns]

And here is the further information, tho it was not a bio stock:

http://seekingalpha.com/article/3975232-insider-weekends-may-13-2016?ifp=1&app=1

"Notable Insider Buys:

1. IDI, Inc. (NYSEMKT:IDI): $5.35

Shares of this data and analytical solutions provider were acquired by 2 insiders:

Director Phillip Frost M.D. acquired 2,190,000 shares, paying $4.80 per share for a total amount of $10.51 million. These shares were purchased indirectly by Frost Gamma Investments Trust.
President James Patrick Reilly acquired 900 shares, paying $4.79 per share for a total amount of $4,311. Mr. Reilly increased his stake by 2.87% to 32,238 shares with this purchase.

We were a little surprised to see this purchase by Dr. Frost as most of his large purchases in the past were related to the healthcare company Opko Health (NYSE:OPK) where he serves as the Chairman and CEO. This is his largest purchases in IDI since we started tracking insider transactions back in 2010 and leaves him with a 34% stake in the company following the purchase.

Dr. Frost began his career in 1972, when he bought Key Pharmaceuticals along with Michael Jaharis and turned the company around. He was Chairman of the Board of Directors of Key Pharmaceuticals until 1986 when it was acquired by Schering-Plough for $587 million. After the acquisition of Key Pharmaceuticals, Dr. Frost founded the IVAX Corporation in 1986 along with Dr. Jane H. Hsiao, the current CTO of Opko Health.

IVAX specialized in generic drugs and played a significant international role in Latin America, Central and Eastern Europe. IVAX was acquired by Teva Pharmaceuticals (NYSE:TEVA) in 2006. Dr. Frost became Vice Chairman of Teva after the acquisition of IVAX in 2006. In 2010, he was named Chairman of the Board of Teva and was reelected to the position in May 2012."