What happened

Shares of Wanda Sports Group (WSG) soared on Wednesday after the company received a buyout offer. The proposed acquisition implied 37% upside from where the stock closed yesterday, hence its pop when the market opened this morning. As of 1:30 p.m. EDT, Wanda Sports Group -- a global sports events, media, and marketing platform -- was up 28%.

So what

So who is this buyer anyway? It turns out, the offer came from Wanda Sports & Media Holding Company. This holding company already owns 72% of the Class B shares of Wanda Sports Group. But now it wants to buy all of the Class A shares for just $1.67 each. 

A businessman riding a rocket ship expelling cash exhaust flies over a multi-colored bar chart.

Image source: Getty Images.

Before you get too upset, remember the Class A shares don't trade on the Nasdaq. Trading in the U.S. is in American depository shares, which represent 1.5 Class A shares each. Therefore, the buyout proposal of $1.67 per share is the equivalent of $2.50 per depositary share.

While today's pop is certainly nice for newer Wanda Sports Group shareholders, it's not welcome news for those who've been holding for the long term. The American depository shares have lost more than half their value over the past year, and the buyout proposal (if approved) will lock those losses in forever.

WSG Chart

WSG data by YCharts.

Now what

Here's why this deal is almost guaranteed to go through: Wanda Sports & Media Holding Company has 91% of the voting power of Wanda Sports Group, due to the large amount of Class B shares it holds. Therefore, even if other parties don't like this, they have little power to prevent it. 

The issues caused by this kind of structure are rarely this extreme. But it is a reminder how important due diligence is. Included in due diligence, especially with international stocks, is understanding who really has control in the company.