July 1 (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 ( AMZN ) 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.