SUMMIT MATERIALS INC -CL A (SUM) Institutional Ownership and Insiders Activity

SUMMIT MATERIALS INC -CL A (SUM) is widely held by institutional investors, with 2 firms reporting positions valued at approximately $4.71M based on SEC Form 13F filings for the quarter ended June 30, 2026.

Advisors Asset Management, Inc. is the largest disclosed holder, reporting approximately $4.71M in SUM holdings in its latest filing.

Institutional ownership remains highly concentrated, with Advisors Asset Management, Inc. representing the majority of disclosed value.