ExOne Co (NASDAQ:XONE), Agenus Inc (NASDAQ:AGEN) and 3D Systems Corporation (NYSE:DDD) are today’s top market gainers midday. On the losing end are Timken Co (NYSE:TKR), Fidelity National Financial Inc (NYSE:FNF) and Acuity Brands, Inc. (NYSE:AYI).

3D Systems

ExOne Climbs along with 3D Systems

ExOne Co (NASDAQ:XONE) is today’s top gainer midday, as the 3D printing company’s stock price climbed +17.36%. A Tiger Global pick, XONE has been on a role as of late, its price rising +33.38% over the past five days. However, it is still down -23.34% in 2014.

The price of vaccine developer Agenus Inc (NASDAQ:AGEN) jumped +13.04% midday following the news that one of its experimental cancer vaccines doubles brain tumor patients’ survival rate. Billionaire investor George Soros picked up a position in the biotech firm during the first quarter of the year and has seen its stock price increase a commendable +8.4% over the last three months.

Rounding out today’s list of midday gainers is 3D Systems Corporation (NYSE:DDD), up +10.9%. Like ExOne, DDD is a 3D printing pick for Tiger Global. The company plans to announce second quarter results on July 31st and seems to have investors intrigued.

Timken, Fidelity Spinoffs Shake Things Up

Down -28.58%, Timken Co (NYSE:TKR) is this Tuesday’s biggest midday loser – but the number is deceptive. The price dip is the result of a successful steel business spinoff for the company, TimkenSteel Corp., which commenced trading today. Billionaires Richard Chilton and Ray Dalio stand to profit from the move.

Fidelity National Financial Inc (NYSE:FNF) fell -13%, a dip that is also tied to a spinoff. Fidelity’s shares now come in two types – one based on core business functions (FNF), and another on the company’s ancillary ventures (FNFV). Julian Robertson initiated a position in Fidelity National Financial during the first quarter of 2014.

Down -11.51%, Acuity Brands, Inc. (NYSE:AYI) takes the last spot on today’s list of midday losers. The company revealed yesterday that it had missed quarterly profit and sales estimates, and it is now down -12.11% YTD. George Soros has a small 2,000-share in the company, initiated in Q1.