Quick Takeaways
- Summit Materials, Inc. has 25 insiders with reported activity on this page.
- No net insider buy/sell flow is currently reported for the last year.
- Recent transaction rows are not currently available.
Insider Transactions Reported by 25 Insiders of Summit Materials, Inc.
- Location
- Denver, CO
What Changed
- No meaningful buy/sell imbalance is currently visible in the one-year window.
- Activity will update as new Forms 3/4/5 are filed.
Why This Matters
- This page gives a plain-language issuer insider context before you inspect transaction-level evidence.
- Use the filing links below to verify timestamps, codes, and ownership impacts directly from SEC forms.
Source Evidence
Filed on Form 4
See Original Filing
Issuer insider activity is sourced from SEC Forms 3, 4, and 5.
Insider trading overview
Last 12 monthsInsider buy and sell flow is broadly balanced over the last 12 months. No Buy or Sell transactions have been reported since 07 May 2025.
Buys
$0
Shares: 0
Insiders: 0
Sells
$0
Shares: 0
Insiders: 0
Net
$0
Shares: 0
Insiders: 0
| Window (months) | Buy shares | Sell shares | Buy $ | Sell $ | Net $ |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 0 | $0 | $0 | $0 |
| 6-9 | 0 | 0 | $0 | $0 | $0 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Summit Materials, Inc. executives and other stock owners filed with the SEC include:
Top shareholders of Summit Materials, Inc. (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Ownership % is shown only when it is directly reported or safely comparable across share classes.
Methodology: rows are grouped by holder and ranked by the holder's primary source value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
| Holder | Source | Role / Reporting | Ownership % | Shares | Holdings Value | 12M Net Δ | As of | Details |
|---|---|---|---|---|---|---|---|---|
| Argos SEM, LLC |
3/4/5
|
Director, 10%+ Owner |
—
mixed-class rows
|
54,720,001
mixed-class rows
|
$1,751,040,000 | — | 12 Jan 2024 | |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13D/G
|
T. Rowe Price Associates, Inc. |
3%
|
5,353,933
|
$270,908,474 | $0 | 31 Dec 2024 | |
| Brian James Harris |
3/4/5
|
EVP & Chief Financial Officer |
—
mixed-class rows
|
229,986
mixed-class rows
|
$7,359,552 | — | 28 Feb 2023 | |
| Kekin Ghelani |
3/4/5
|
Chief Strategy&Growth Officer |
—
mixed-class rows
|
30,390
mixed-class rows
|
$1,293,707 | — | 07 Mar 2024 | |
| John R. Murphy |
3/4/5
|
Director |
—
class O/S missing
|
21,499
|
$687,968 | — | 29 Sep 2023 | |
| Deon MacMillan |
3/4/5
|
EVP, Chief People Officer and Head of Corporate Communications |
—
mixed-class rows
|
12,923
mixed-class rows
|
$413,536 | — | 10 Mar 2022 | |
| HUNTINGTON NATIONAL BANK |
13F
|
Company |
0%
|
2
|
$105 | — | 31 Dec 2025 |
Recent Insider Transactions by Companies or Individuals for Summit Materials, Inc.
Showing up to 300 most recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | Value $ | * Price $ | Shares | Shares Owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| No insider transactions were found in the last 12 months for this issuer. | ||||||||||
* An asterisk sign (*) next to the price indicates that the price is likely invalid.