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* Asian first half M&A at second-highest level of $707.7 bln

* Southeast Asia deals hit record $124.8 bln

* Private equity-backed deals at $102 bln, also a record

* Bankers see de-spac transactions materialising in second half

By Kane Wu and Anshuman Daga

HONG KONG/SINGAPORE, July 1 (Reuters) - Asian merger and acquisition activity surged to its second-highest level ever for a first half as Southeast Asian and private-equity deals hit records, and bankers expect the strong momentum to be maintained for the rest of the year.

Announced deals involving Asian companies came to $707.7 billion in January-June, up 75% from the same period a year earlier and not far off the record of $758.6 billion logged in the first half of 2018, Refinitiv data showed.

Southeast Asia deals jumped 83% to a record $124.8 billion driven by blockbuster transactions including ride-hailing giant Grab's $40 billion merger with U.S. special-purpose acquisition company (SPAC) Altimeter Growth Corp.

Bankers expect Southeast Asia to remain a big focus for dealmaking.

"You still haven't seen capex demand come through because the Southeast Asian region is still kind of nascent in the recovery but you will start to see this re-emerging alongside refinancing and consolidation and M&A demand," said Amit Khattar, head of investment bank, Asia Pacific, at Deutsche Bank.

He expects M&A in digital infrastructure such as data centres, telecommunication towers and the consumer sector, as well as real estate transactions, particularly in Singapore, as companies reassess office markets.

Other chunky deals in Southeast Asia included the $18 billion merger of Grab's Indonesian rival Gojek with local e-commerce firm Tokopedia, and a $15 billion merger of the units of Malaysian telecoms firm Axiata Group and Norway's Telenor.

"We're only half way through the year, but if market conditions remain constructive and based on our backlog, we look well placed to break all records," said David Biller, head of Citigroup's Southeast Asia banking, capital markets and advisory business.

"The themes continue to be tech, consumer and healthcare. The spread of capital market and M&A deals is very much across all countries."

Private equity-backed deals more than doubled to a record $102 billion.

Asia-focused PE funds raised $80.5 billion as of June 25, up 59% from a year ago and the most in two years, according to data provider Preqin. Dry powder in the region hit a new high of $384.9 billion in June.