Roxbury Partners Increases Stake in ATI

Roxbury Partners, a Washington investment partnership, said it increased its stake in Glendale-based ATI Medical Inc. to about 6.4% from 5.1%, according to a filing with the Securities and Exchange Commission. The partnership said it bought the stake as an investment and plans to buy more stock in ATI, which rents medical equipment. Roxbury said it paid about $3 million for the about 67,000 shares it acquired between Nov. 10 and Jan. 2.