Additionally, in $2017,$ Under Armour reported the lowest sales growth percentage at $3\%.$ This might suggest that in $2015$ and $2016,$ Under Armour was already struggling and simply utilizing the accounts receivable change to simulate sales growth.

c$.$ Under Armour provided the following disclosures on page $53$ of its December $31,2013$ Annual report.

Concentration of Credit Risk

Financial instruments that subject the Company to significant concentration of credit risk consist primarily of accounts receivable. The majority of the Company's accounts receivable is due from large sporting goods required. The most significant customers that accounted for a large portion of net revenues and accounts receivable are as follows:

$\backslash$table$[[$Custonser$,$Customer $q,,$Customer c$],[16\mathrm{.}6\%,5\mathrm{.}3\%,4\mathrm{.}8\%],[16\mathrm{.}6\%,5\mathrm{.}8\%,5\mathrm{.}2\%],[18\mathrm{.}2\%,7\mathrm{.}4\%,5\mathrm{.}6\%],[27\mathrm{.}1\%,9\mathrm{.}1\%,5\mathrm{.}1\%],[26\mathrm{.}4\%,8\mathrm{.}8\%,7\mathrm{.}0\%],[25\mathrm{.}4\%,8\mathrm{.}6\%,5\mathrm{.}5\%]]$

Customer A$,$ Customer B$,$ and Customer C might be Dick's Sporting Goods, The Sports Authority, or