July 30 (Reuters) - Lam Research LRCX.O forecast first-quarter revenue above Wall Street expectations on Wednesday, driven by strong demand for its specialized chip-making equipment used in developing advanced artificial intelligence processors, sending its shares up over 4% in extended trading.

Demand for Lam's equipment has been bolstered by a surge in orders for artificial intelligence semiconductors, with chip designers striving to develop advanced processors to meet growing computing needs.

However, tariffs imposed by U.S. President Donald Trump have introduced volatility into the chip industry, prompting firms to reassess costs and seek clarity on the potential impact of the duties.

Dutch firm ASML ASML.AS, the world's biggest supplier of computer chip-making equipment, warned earlier this month that it may not achieve revenue growth in 2026.

Lam forecast first-quarter revenue of $5.20 billion, plus or minus $300 million, compared with estimates of $4.63 billion, according to data compiled by LSEG.

It forecast quarterly adjusted earnings per share of $1.20, plus or minus 10 cents, while analysts expect $1 per share.

The company reported revenue of $5.17 billion for the quarter ended June 29, beating estimates of $5.01 billion.

Lam reported quarterly earnings per share of $1.35, compared with a profit of 78 cents per share, a year ago.

(Reporting by Zaheer Kachwala in Bengaluru; Editing by Mohammed Safi Shamsi)

((Zaheer.Kachwala@thomsonreuters.com;))