Deals of the day-Mergers and acquisitions

May 8 (Reuters) - The following bids, mergers, acquisitions and disposals were reported by 1330 GMT on Thursday:

** Coinbase COIN.O, the largest publicly traded cryptocurrency exchange, said it will buy derivatives exchange Deribit for $2.9 billion.

nL4N3RG1MR

** Specialty MGA Optio Group has acquired UK-based MGA Custodian Management for an undisclosed sum, the company said.

nL6N3RG0CB

** Japan's Nidec Corp <6594.T> said it was withdrawing its bid for Makino Milling Machine <6135.T>, giving up on its unsolicited takeover plan after Makino threatened to mount a "poison pill" takeover defence.

nL1N3RG0D2

** Japanese telecoms firm Nippon Telegraph and Telephone <9432.T> announced plans to take its subsidiary NTT Data <9613.T> private by purchasing the shares it does not already own for 2.37 trillion yen ($16.4 billion).

nL4N3RF21J

** London-based mobile game developer Tripledot Studios has agreed to buy marketing platform AppLovin's mobile games studio portfolio for about $800 million in cash and stock, it said.

nL1N3RG069

** U.S.-listed ride-hailing and food delivery company Grab is looking to strike a deal to take over smaller Indonesian rival GoTo in the second quarter, two sources with knowledge of the matter said.

nL1N3RF0II