Deals of the day - Mergers and acquisitions

April 28 (Reuters) - The following bids, mergers, acquisitions and disposals were reported by 1330 GMT on Monday:

*Austrian bank Erste Group Bank ERST.VI is in discussions with Santander SAN.MC about buying a 49% stake in the Spanish bank's Polish unit SPL1.WA, the lenders said.

nL1N3R60JX

Mediobanca MDBI.MI struck back in the takeover war gripping Italian finance with a 6.3 billion euro ($7.15 billion) offer for wealth manager Banca Generali BGN.MI to be financed by handing over its stake in insurer Generali GASI.MI.

nL4N3R60AZ

Banijay BNJ.AS, the French TV production group behind "Big Brother" and backed by the Arnault family, has held discussions about a possible offer for British broadcaster ITV's studio business, two people familiar with the matter told Reuters.

nL8N3R5082

Merck KGaA MRCG.DE has struck a deal to buy U.S. biotech company SpringWorks Therapeutics SWTX.O for an equity value of $3.9 billion to add rare cancer therapies ahead of expected revenue losses linked to expiring patents.

nL1N3R606C

Vivendi VIV.PA may challenge a court ruling requiring France's market watchdog to look again at whether shareholders should have received a mandatory buyout offer when the group split last year, its secretary general said.

nL8N3R60LT

India signed a deal with France to buy 26 Rafale fighter aircraft worth 630 billion rupees ($7.4 billion) for its navy, the Indian defence ministry said in a statement.

nL1N3R60AD

Airbus AIR.PA finalised an agreement to take over some plants from Spirit AeroSystems SPR.N in a carve-up of the struggling supplier with rival Boeing BA.N, as unions raised concerns over politically sensitive jobs in Northern Ireland.

nL4N3R60KI

*Ant Group, an affiliate of China's e-commerce giant Alibaba Group 9988.HK, is buying a $362 million controlling stake in Bright Smart Securities & Commodities Group 1428.HK, marking its first acquisition of a securities brokerage licence.

nL1N3R6010

Shares in British meal delivery company Deliveroo ROO.L jumped 17% in early deals, the first trading session after it said it had received a $3.6 billion cash buyout proposal from U.S. peer DoorDash DASH.O.

nL4N3R60F4