'Merger Monday' is back, with more than $60 billion of deals announced today. Here are the 5 biggest.

LVMH confirmed Monday that it would buy Tiffany & Co for $16.2 billion cash, or $135 per share.

The acquisition is the largest in the luxury fashion conglomerate's history. LVMH also owns brands such as Christian Dior, Louis Vuitton, and Hennessy. The deal is expected to bolster the conglomerate's presence in the US market, as well as its fine jewelry offerings.

Tiffany reportedly asked LVMH to boost its initial offer of $14.5 billion made in early November, according to Reuters.

Novartis inked a deal on Sunday to buy The Medicines Company for $9.7 billion in cash, or $85 per share.

The offer price represents almost a 41% premium above the company's thirty-day volume weighted moving average price, according to a press release from Novartis.

The Medicines Company is known for developing inclisiran, a cholesterol-lowering drug that was once expected to generate billions in sales, Stat News reported.

"This transformational, new investigational medicine has the potential to meaningfully address one of the largest areas of underserved patient need," Novartis Pharmaceuticals President Marie-France Tschudin said in the release.

The Wall Street Journal reported on Monday that Viagogo has agreed to purchase StubHub from eBay for $4 billion in cash. The news sent shares of eBay trading as much as 6% higher.

The transaction could close as early as Monday, the Journal found. In 2007, eBay purchased StubHub for $310 million. The ticket sales platform grew revenue by 5% to $306 million in the third quarter of 2019, according to eBay's earnings report.

Activist investors Starboard Value and Elliott Management began pushing eBay to offload StubHub in January, according to the Journal.

The sale would also bring StubHub back under control of cofounder Eric Baker, the current CEO of Viagogo.

Dutch power provider Eneco said on Monday its shareholders agreed to sell itself to a consortium led by Mitsubishi Corporation for 4.1 billion euros, or about $4.52 billion.

Mitsubishi will put up 80% of the funds for the transaction, while Japanese energy company Chubu will provide the other 20%.

The deal will allow Mitsubishi to expand its energy business throughout Europe, as Eneco will become its European center for energy-related operations, according to a press release.

Mitsubishi beat out private equity group KKR and Royal Dutch Shell for the deal.