Tickers: OXY, APC Sector: Energy Deal value: $54.4 billion Source: MergermarketSector: Industrials and chemicals Deal value: $70.4 billion Source: MergermarketTickers: AGN, ABBV Sector: Pharmaceuticals Deal value: $86.3 billion Source: MergermarketTickers: UTX, RTN Sector: Defense Deal value: $88.9 billion Source: MergermarketTickers: BMY, CELG Sector: Pharmaceuticals Deal value: $89.5 billion Source: Mergermarket