SUMMIT MATERIALS INC -CL A - COMMON STOCK (SUM)

CUSIP: 86614U100

Q4 2025 13F Holders as of 31 Dec 2025

Security type / class
Equity / COMMON STOCK
Total 13F shares
2
Total 13F value
$105
Holder snapshot 5 signals
Share change
-3,400
SEC-reported price per share
$52.50
Number of holders
1
Value change
-$132,702
Number of sells
1
Security identity Names, identifiers, and filing context for this profile. 1 source field
Shares outstanding
178,464,433

Security key

86614U100

Report period

Q4 2025

Institutions

1

Top holders

1

SUM full security history Ownership snapshot Full 13F holder table Newer quarter: Q1 2026 Previous quarter: Q3 2025 Summit Materials, Inc. SEC filings Summit Materials, Inc. company facts

Broader feeds

Latest 13F filings Latest 13D/G filings Investors directory

Ownership snapshot

Top reported holders of SUM - SUMMIT MATERIALS INC -CL A - COMMON STOCK (13F + 13D/G + 3/4/5)

Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.

Comparable stake leader
PRICE T ROWE ASSOCIATES I...
Disclosed value leader
Argos SEM, LLC
Comparable rows
1/9
Latest evidence
30 Sep 2025
13D/G 3/4/5 13F Lead comparable stake: 3% 8 rows are not safely comparable across share classes. 13D/G row: PRICE T ROWE ASSOCIATES INC /MD/ Showing 1-6 of 9 holder rows.

Quick read

PRICE T ROWE ASSOCIATES INC /MD/ leads the comparable SEC ownership view at 3%.

1 of 9 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.

Open SEC evidence Opens PRICE T ROWE ASSOCIATES INC /MD/'s linked filing trail.
Comparable ownership Top 1
PRICE T ROWE ASSOCIATES INC /MD/ 3%

Ownership % is shown only when SEC disclosures are safely comparable across share classes.

Detailed SEC evidence table Showing 1-6 of 9 holder rows
Holder Evidence Ownership % Position 12M Net Δ As of
PRICE T ROWE ASSOCIATES INC /MD/
13D/G
T. Rowe Price Associates, Inc.
13D/G
3%
Reported 13D/G · 31 Dec 2024
$270,908,474
5,353,933 shares
 $0 31 Dec 2024
Argos SEM, LLC
3/4/5
Director, 10%+ Owner
3/4/5
—
mixed-class rows
$1,751,040,000
54,720,001 shares
mixed-class rows
 — 12 Jan 2024
Brian James Harris
3/4/5
EVP & Chief Financial Officer
3/4/5
—
mixed-class rows
$7,359,552
229,986 shares
mixed-class rows
 — 28 Feb 2023
Kekin Ghelani
3/4/5
Chief Strategy&Growth Officer
3/4/5
—
mixed-class rows
$1,293,707
30,390 shares
mixed-class rows
 — 07 Mar 2024
John Raymond Murphy
3/4/5
Director
3/4/5
—
denominator unverified
$687,968
21,499 shares
 — 29 Sep 2023
Deon MacMillan
3/4/5
EVP, Chief People Officer and Head of Corporate Communications
3/4/5
—
mixed-class rows
$413,536
12,923 shares
mixed-class rows
 — 10 Mar 2022
How to read this table

Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.

13F holder rows

Institutional holders as of Q4 2025

Investor-level positions for this CUSIP, loaded as an interactive table.

Institutions
1
Shares
2
Rows available
1
Investor Option Weight % Change % SEC-reported value * Price Shares Share Change Activity Report Period

* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.

Compare Q4 2025 vs Q3 2025 Across Filers

Q3 2025 holders
3
Q4 2025 holders
1
Holder diff
-2
Investor Q3 2025 Shares Q4 2025 Shares Share Diff Share Chg % Q3 2025 value Q4 2025 value Value change Value Chg %

Trend: ostatnie 8 kwartałów (+ wybrane okresy porównania).

Quarterly Holders Trend
Quarterly Value Trend
Quarterly Shares Trend
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