Mati, the energy drink company founded by former Duke University student Tatiana Birgisson, plans to raise $3.75 million in equity.

Since the sale began April 12, 32 investors have invested $2.5 million into the company. The filing states the sale is expected to last less than a year.

Mati Energy drink is a blend of juices mixed with Guayusa, the second-most caffeinated plant behind coffee. Birgisson began making a version of the drink in her dorm room and went on to found her company in 2012.

Today, the energy drinks are sold in more than 400 retail outlets in North Carolina, South Carolina, Georgia and Tennessee. It recently began selling in the Sam’s Club in Durham.

Birgisson made Inc.’s 30 Under 30 list in 2016.

Because Mati is a private company, its sales and valuation are not public. It last raised money in August 2016 when it raised $2.1 million.

The filing can be found here.