Wendy's, the second-largest fast-food burger chain in the US, opened its doors in 1969. dcwcreations/Shutterstock

Wendy's could be undergoing major changes.

When Wendy's opened in 1969, its menu had just five items: burgers, Frosties, fries, chili, and soft drinks.

More than five decades later, the chain has grown into the nation’s second-largest fast-food burger brand based on sales, according to QSR Magazine .

Now, Wendy’s could be headed for another major change: a potential acquisition.

On Wednesday, The Wall Street Journal reported that Trian Fund Management, which is owned by billionaire investor Nelson Peltz, and its partners offered $1.4 billion, or $7.35 per share, to buy Wendy’s and take the company private.

The proposal is still under review by a special committee, so no acquisition has been finalized, but it would mean a major shake-up for the burger chain.

Here are 9 things you probably never knew about Wendy's.

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