Galectin Therapeutics Inc. (NASDAQ:GALT), FireEye Inc (NASDAQ:FEYE) and Hansen Medical, Inc. (NASDAQ:HNSN) 6.06% are this Tuesday’s top gainers midday. The losers are Tasman Metals Ltd (NYSEMKT:TAS), International Tower Hill Mines Ltd (NYSEMKT:THM) and Intrexon Corp (NYSE:XON).

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Drug Developer Galectin Surges

Surging +6.85%, today’s top midday gainer is Galectin Therapeutics Inc. (NASDAQ:GALT). The drug developer missed the mark with its results release last Tuesday but is apparently making a comeback. Billionaire George Soros initiated a position in the company in Q1.

Network security company FireEye Inc (NASDAQ:FEYE) jumped +6.36% ahead of its lock-up expiration tomorrow, with which 92 million shares are expected to become available. Tiger Global has maintained a position in the company across two quarters.

The share price of Hansen Medical, Inc. (NASDAQ:HNSN), another Soros Q1 buy, surged +6.06% midday. The firm appointed a new CEO at the start of the month and has also experienced a handful of insider purchases. Today, Cowen and Company lowered its target price to $2.50.

Tasman Metals Dips

Tasman Metals Ltd (NYSEMKT:TAS) dipped -8.65% today after agreeing to end merger negotiations with Flinders Resources Limited. George Soros has maintained a 1.6-million share position in the company across several quarters.

Down -6.25% midday today, International Tower Hill Mines Ltd (NYSEMKT:THM) takes the second spot on today’s list of losers. The John Paulsonpick is still up a solid +51.22% in 2014.

Intrexon Corp (NYSE:XON) slipped -6.12%. In the portfolios of billionaires investors David Einhorn and Daniel Loeb, the biotech company experienced a share price surge late last week but has struggled this year and is down -29.24% YTD.