(Reuters) - Artificial intelligence-focused companies, mostly chipmakers, saw big gains in their market capitalization at the end of June, with Nvidia ( NVDA ) briefly overtaking Microsoft ( MSFT ) to become the most valuable company in the world.

Nvidia ( NVDA ) shares rose as much as 27% in June, boosting its market capitalization to $3.34 trillion, before giving up some of their gains later in the month, due to profit booking and concerns over its high valuations.

Microsoft's ( MSFT ) market capitalization increased by 7.6%, while that of Apple Inc ( AAPL ) surged 9.6% over the past month.

Meanwhile, Amazon.com Inc hit $2 trillion in market value last month, becoming the fifth U.S. company to achieve the milestone, riding on AI-influenced enthusiasm.

Broadcom Inc's market capitalization jumped about 20% last month after it increased its annual revenue forecast for AI-related chips by 10% and announced a stock split to capitalize on this year's rally in its shares.

(Reporting By Patturaja Murugaboopathy and Gaurav Dogra in Bengaluru; Editing by Anil D'Silva)