The Walt Disney Company has agreed to acquire Marvel Entertainment in a stock and cash transaction, the companies announced this morning. Under the terms of the agreement and based on last week’s closing price of Disney, Marvel shareholders would receive a total of $30 per share in cash plus approximately 0.745 Disney shares for each Marvel share they own.

Based on the closing price of Disney stock on Friday, August 28, the total transaction value is $50 per Marvel share or approximately $4 billion.

Under the deal, which has been approved by the boards of both companies, Disney will acquire ownership of Marvel including its portfolio of over 5,000 Marvel characters. That portfolio includes many familiar names like Iron Man, Spider-Man, X-Men, Captain America, Fantastic Four and Thor.

Says Disney CEO Robert A. Iger in a statement: “We believe that adding Marvel to Disney’s unique portfolio of brands provides significant opportunities for long-term growth and value creation.”

Ike Perlmutter, Marvel’s CEO, added: “Disney is the perfect home for Marvel’s fantastic library of characters given its proven ability to expand content creation and licensing businesses. This is an unparalleled opportunity for Marvel to build upon its vibrant brand and character properties by accessing Disney’s tremendous global organization and infrastructure around the world.”

Mr. Perlmutter will oversee the Marvel properties, and will work directly with Disney’s global lines of business to build and further integrate Marvel’s properties.

Marvel stock is surging following the news, up 10+ points at the time of writing (+27%), while Disney’s is down a little (-0,5%).