---
schema_version: "secwatch.filing_event.v1"
accession: "0001104659-24-119720"
form_type: "8-K"
ticker: null
cik: "0001621563"
company_name: "Summit Materials, Inc."
filed_at: "2024-11-15T23:59:59+00:00"
generated_at: "2026-05-29T23:47:48.308454+00:00"
event_type: "other"
sentiment: "neutral"
materiality_score: 0.1
calibrated_materiality_score: 0.1
confidence: "high"
source: SEC EDGAR
---

# Summit Materials changes fiscal year to calendar year-end from 52-53 week fiscal year

## Summary
- Board unanimously approved adoption of Fourth Amended and Restated Bylaws on November 13, 2024, effective immediately.
- Fiscal year changed from a 52-53 week period ending on the Saturday closest to December 31 to a calendar year ending December 31.
- Amended Bylaws filed as Exhibit 3.1; marked version showing changes filed as Exhibit 3.2.
- No other changes to governance or shareholder rights were made.

## SEC filing metadata
- accession: 0001104659-24-119720
- form_type: 8-K
- cik: 0001621563
- company_name: Summit Materials, Inc.
- filed_at: 2024-11-15T23:59:59+00:00
- event_type: other
- sentiment: neutral
- materiality_score: 0.1
- calibrated_materiality_score: 0.1
- confidence: high
- sec_items: 5.03, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1621563/000110465924119720/0001104659-24-119720-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1621563/000110465924119720/tm2428384d1_8k.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001104659-24-119720
- JSON: https://secwatch.observer/filing/0001104659-24-119720.json
- Plain text: https://secwatch.observer/filing/0001104659-24-119720.txt

## Key facts
- Governance Changes
  Summit Materials, Inc.: Changed fiscal year from a 52-53 week period ending on Saturday closest to December 31 to a calendar year ending December 31 (effective 2024-11-13).
  - Change: fiscal year change
  - Effective: 2024-11-13
  source text: The amendment effected by such Amended Bylaws changes the Company’s fiscal year from a 52-53 week period ending on the Saturday that is closest to December 31st each year, to the period beginning on January 1st and ending on the 31st day of December in each year.
  evidence_url: https://www.sec.gov/Archives/edgar/data/1621563/000110465924119720/0001104659-24-119720-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.