ATI Technologies ( ATYT) is expanding its presence in China. The graphics-chip maker announced Monday that it has acquired Macrosynergy, a Shanghai-based rival. As part of the deal, ATI will gain Macrosynergy's offices in the Chinese city and in Santa Clara, Calif., and the approximately 115 employees based in the two locations, ATI spokesman Dave Erskine said. The deal will help ATI gain a share of the Chinese PC market, company officials said in a statement. "This transaction brings ATI two important elements -- presence in a country that is emerging as the next big technology market, and a team of engineers that are highly skilled in our key product areas," said ATI CEO Dave Orton. ATI did not disclose how much it paid for Macrosynergy, or the form of that payment. Bbut Erskine said the deal, which is effective immediately, cost ATI less than $10 million. The company already had an office in Shanghai and another in Beijing. Erskine did not know how many employees ATI has in either office, but said the Shanghai one was considerably smaller than the Macrosynergy office ATI just acquired. In after-hours trading after ATI announced the deal, the company's shares were off 2 cents, or less than 1%, to $15.19. Earlier in the day, the company's stock closed the regular session off 57 cents, or about 4%, to $15.21.