Barclays lost three senior mergers and acquisitions bankers to Rothschild in recent weeks according to reports.
Hewlett-Packard tried to pull out of its $11bn (£7bn) takeover of British software firm Autonomy before the deal closed, according to claims in a $1bn shareholder lawsuit brought against the US computer maker.
Technology billionaire Michael Dell's plans to take his troubled computer company private were dealt a blow on Monday as two rivals topped his offer and raised the prospects of a bidding war.
Worldwide M&A Up 6% from 2012; Best Annual Period for Deal Making in Two Years
Bloomberg's Olivia Sterns recaps the major deals that drove the biggest week of M&A activity since 2008.
Cross-border European financial- services takeovers are unlikely to pick up in the next 18 months as regulatory change makes it harder for banks to allocate capital and tough market conditions persist, UBS has said.
Apple is due to secure its acquisition of a company specialising in fingerprint scanning next month, days after the latest iPhone goes on sale, suggesting the technology will be used to improve security in the world's bestselling phone.