By Don Clark 

An accelerating wave of consolidation in the semiconductor industry has a new point man: Hock Tan, a press-shy numbers guy now mounting the largest takeover in high-tech history.

The 63-year-old chief executive of Avago Technologies Ltd. stepped into the limelight on Thursday with a $37 billion cash-and-stock deal to buy Broadcom Corp. The transaction would meld two companies with complementary sales of communications chips, including processors that handle different chores in smartphones from Apple Inc. and Samsung Electronics Co.

It also would continue the CEO's practice of using debt to finance takeovers of bigger name firms with larger workforces, shedding nonessential operations and staff and taking other steps to boost profit margins.

His company, the result of a buyout of Agilent Technologies Inc. operations that started as part of Hewlett-Packard Co., makes chips for scores of products including smartphones, computer disk drives, consumer appliances, data networks, telecommunications, and industrial gear. It went public in 2009 at $15 a share. The stock closed Thursday at $142.38.

Broadcom, whose revenues last year were nearly twice the size of Avago's, would take Mr. Tan's company into markets including cable modems, TV set-top boxes, Wi-Fi and data center switching systems. The combined company would be called Broadcom Ltd.

"This is a landmark day in the history of the industry," said Scott McGregor, age 58, Broadcom's chief executive, during a conference call on Thursday.

Some investors bet it won't be the last word on Broadcom's future. The company's shares closed on Thursday at $56.25, above Avago's $54.50 per share offer price, a sign investors feel a higher offer may emerge.

Qualcomm Inc. and Intel Corp. also discussed buyout possibilities with Broadcom, though Avago's interest appeared more serious, a person familiar with the situation said. Intel and Qualcomm representatives declined to comment.

Asked on the conference call about the possibility of other bids, Mr. Tan said it would be hard to match Avago's offer, but he wouldn't dismiss the possibility entirely. "We feel a little paranoid," he said.

Mr. Tan, who declined to comment through a spokesman, rarely submits to interviews. One former colleague said Mr. Tan's short stature and walk reminded him of a bulldog, as does his personality. He is known for driving employees hard and spending as little as possible on chores like marketing.

People who have worked with him say he spends little time on anything but work, preferring to let results speak for themselves. Those include his $6.6 billion deal in 2013 for LSI Corp., which roughly doubled Avago's size, despite the fact that Mr. Tan sold off LSI operations that some industry executives had deemed promising.

One of Mr. Tan's hallmarks is to rein in spending on speculative projects, colleagues say, focusing on chips with established customers and favorable profit margins. Avago, they note, sells many parts whose technology originated in developments decades ago at H-P and AT&T.

"He has a unique ability to run a big business as if it were a small business," said Kenneth Hao, an Avago director and managing partner at Silver Lake, the chip maker's second-largest investor.

Not that Mr. Tan doesn't spend on research. He beefed up development of components that help filter cellular signals to improve connections, a person familiar with the decision said. That bet proved prescient when smartphones began using multiple wireless networks and required multiple filters.

Mr. Tan, a native of Penang, Malaysia, received a master's degree in mechanical engineering from the Massachusetts Institute of Technology and a master's degree in business administration from Harvard University. He held financial positions at General Motors Co. and PepsiCo Inc. before taking his first technology-related job at Commodore International Ltd., an early PC maker based in Pennsylvania, where he served as vice president of finance.

His first big success came as chief operating officer of Integrated Circuit Systems Inc., which Mr. Tan helped take private and then public again. That company was sold in 2005 to Integrated Device Technology Inc. for $1.7 billion.

Though Integrated Circuit Systems was a relatively small company, Mr. Tan's record was enough to attract private-equity firms Silver Lake and KKR & Co., which led the $2.66 billion buyout in 2005 that created Avago. They recruited him to join the company the next year.

Mr. Tan now works mainly from the San Jose, Calif., offices of Avago, though the company is incorporated in Singapore. He also maintains a residence in Pennsylvania, the location of some former LSI operations.

Although he holds Avago shares worth more than $250 million at current prices, Mr. Tan has shied away from trappings like a fancy office or public appearances, people who have worked with said. He does have a fondness for expensive cars, however, recently purchasing a Tesla Motors Inc. electric car, one of those people said.

His latest deal would have Avago pay Broadcom shareholders $17 billion in cash and about $20 billion of its shares. Broadcom investors could choose to receive $54.50 a share in cash or about 0.44 shares in a newly formed Singapore holding company, among other options. They would own about 32% of the combined company.

Avago said it planned to fund the cash portion of the deal with money on hand and $9 billion in new debt financing from a consortium of banks.

Broadcom co-founder Henry Samueli, its 60-year-old chairman and chief technical officer, would serve as chief technology officer of the combined company and join its board. The transaction is expected to close by early next year.

Shares of Broadcom declined 1.6% on Thursday, after surging 21% on Wednesday when The Wall Street Journal reported the companies were in advanced merger talks. Avago shares were up less than a percentage point in 4 p.m. Nasdaq trading.

Dana Mattioli and Dana Cimilluca contributed to this article.

Write to Don Clark at don.clark@wsj.com

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