Summit Materials, Inc.

CUSIP: 86614u100 Class: COM

First Dallas Securities Inc.'s Holding History (CIK: 0001378559)

Note: Option positions (PUT/CALL) are excluded.

Q4 2018
Shares 20,001 Value ($000) $248 Avg Close — Range —
Q1 2016
Shares 10,354 Value ($000) $201 Avg Close — Range —