(Updates Premier Oil)
Jan 7 (Reuters) - The following bids, mergers, acquisitions and disposals were reported by 2100 GMT on Tuesday:
** Premier Oil is set to buy North Sea assets from BP and increase its stake in the Tolmount gas project, funded by a $500 million rights issue, but faces opposition from hedge fund ARCM, which vowed to fight the plans.
** U.S.-based private equity firm Insight Partners will buy cybersecurity firm Armis at a valuation of $1.1 billion, the companies said on Monday. (Compiled by Dania Nadeem and Ambhini Aishwarya in Bengaluru)