Adds: Summit Materials, Mubadala Capital, Old National Bancorp, EQT, Sidenor Updates:

Nov 25 (Reuters) - The following bids, mergers, acquisitions and disposals were reported by 1430 GMT on Monday:

** Summit Materials SUM.N said rival Quikrete would acquire the company in a cash deal valued at $11.5 billion, in a move to capitalize on higher demand for building materials.

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** Abu Dhabi's Mubadala Capital will take CI Financial CIX.TO private in a C$12.1 billion ($8.66 billion) all-cash deal, including debt, the Canadian asset and wealth manager said.

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** Regional lender Old National Bancorp ONB.O will buy privately held Bremer Financial in a $1.40 billion cash-and-stock deal, the companies said, creating a combined bank with over $70 billion in assets.

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** Natural gas producer EQT EQT.N said alternative asset manager Blackstone BX.N would buy minority stakes in some of its pipelines for $3.5 billion in cash through a joint venture.

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** Basque steelmaker Sidenor has made an offer to buy a 29.9% stake in Spanish train maker Talgo TLGO.MC held by global investment fund Trilantic, a source close to the negotiations said, confirming an earlier report by Expansion newspaper.

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** Italy's UniCredit CRDI.MI launched a surprise 10 billion euro ($11 billion) bid for domestic peer Banco BPM BAMI.MI, which CEO Andrea Orcel said would not get in the way of a potential deal for Germany's Commerzbank CBKG.DE.

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** Pipeline operator ONEOK OKE.N said on Sunday it would buy the remaining shares of peer EnLink Midstream ENLC.N for $4.3 billion in an all-stock deal, boosting its presence in the Permian Basin amid increased consolidation in the U.S. energy sector.

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** QatarEnergy has entered into an agreement with TotalEnergies to acquire additional offshore exploration interests in the Orange Basin off the coast of Namibia, it said on Sunday.

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(Compiled by Rajarshi Roy and Kamal Choudhury in Bengaluru)

((Rajarshi.Roy@thomsonreuters.com;))