April 22 (Reuters) - The following bids, mergers, acquisitions...

April 22 (Reuters) - The following bids, mergers, acquisitions and disposals were reported by 0930 GMT on Monday:

** Saudi Arabia's sovereign wealth fund PIF has agreed to acquire a 51% stake in Telecommunication Towers Company Limited (TAWAL) from STC Group 7010.SE , paving the way for the creation of the region's largest telecom tower company, PIF and STC said.

** Portuguese oil company Galp Energia GALP.LS has launched the sale of half of its stake in an exploration block offshore Namibia where it has made a major oil discovery, three industry sources familiar with the matter told Reuters.

** European investment company Permira has begun the process for the sale of its 50% stake in Asian aquatic food provider Grobest, targeting a valuation of about $1 billion for the Taiwan-based company, said three sources close to the matter.

** Korea's SK Square 402340.KS is selling up to $198 mln of Krafton Inc 259960.KS in a block trade, according to a term sheet seen by Reuters.

** U.S.-based Quanex Building Products NX.N will buy doors and windows supplier Tyman TYMN.L in a cash and share deal, valuing the British firm at about 788 million pounds ($976 million), the companies said.

** Blackstone BX.N made a potential offer to buy Hipgnosis Songs Fund SONG.L for about $1.5 billion, outbidding Apollo-backed Concord and triggering a takeover battle for the owner ofmusic rights by artists including Shakira and Red Hot Chili Peppers.

** Business software maker Salesforce CRM.N has backed away from its talks to acquire data-management software firm Informatica INFA.N after the two companies could not agree on terms, a person familiar with the matter told Reuters on Sunday.

** Australian mineral sands miner Base Resources (BSE) said it had agreed to a A$375 million ($240.90 million) takeover offer from U.S.-based uranium and rare earths producer Energy Fuels UUUU.A .