Even in this year’s highly caffeinated deal market, this one’s a biggie.

Waterbury, Vermont-based Keurig Green Mountain Inc. has agreed to be acquired for $13.9 billion by an investor group led by JAB Holding Co. and its owners, Germany’s überwealthy (and lately coffee-obsessed) Riemann clan. Announced Monday and expected to close in the first quarter of next year, the transaction will see JAB pay $92 per share in cash for Keurig Green Mountain.