Short interest in Summit Materials Inc Cl A (NYSE:SUM) increased during the last reporting period, rising from 7.00M to 8.67M. This put 7.2% of the company's publicly available shares short.

Short interest in Summit Materials Inc Cl A Corp (XNYS:SUM) decreased during the last reporting period, falling from 280.30M to 275.20M. This put 1.17% of the company's publicly available shares short.

Based on the recent average volume of 2.64M shares traded per day, it would take 3.29 day(s) for holders of this short interest to close out their positions without sending the stock sharply higher.