Ever since what was effectively a 2-for-1 stock split back in April 2016, there had been two publicly traded classes of Under Armour (ticker: UA, UAA) stock: Class A shares that traded under the ticker symbol "UA", and Class C shares, which traded under ticker symbol "UA.C."

Adding more confusion to the situation, the two tickers just changed again in early December. The two classes of Under Armour stock now trade under the ticker symbols UA and UAA.

The main distinction between UA and UAA shares comes down to voting rights. UA stock, formerly trading under the UA.C symbol, stands for Class C shares, with no voting rights. UAA stock, formerly trading under the symbol UA, stands for Class A shares, which confer one vote per share to the owner.