Comparable stake leader
BlackRock, Inc.
SEC ownership of Builders FirstSource, Inc.
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001316835.
Disclosed value leader
BlackRock, Inc.
Comparable rows
3/50
Latest evidence
30 Sep 2026
- Public ticker
- BLDR on NYSE
- Parsed ownership sources
-
13D/G, 13F, and 3/4/5
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
BlackRock, Inc.
Ranking: Comparable ownership first, then disclosed value
- Comparable ownership rows
-
3 of 50
Meaning: Rows with safely comparable ownership %
- Latest 13D/G holder
-
BlackRock, Inc.
Source: Latest parsed Schedule 13D/G stake
- Latest parsed ownership date
-
30 Sep 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001316835
- Issuer location
- Irving, TX
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
3 signals
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of Builders FirstSource, Inc. (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
BlackRock, Inc.
Disclosed value leader
BlackRock, Inc.
Comparable rows
3/50
Latest evidence
30 Sep 2026
13D/G
13F
3/4/5
Lead comparable stake: 12%
47 rows are not safely comparable across share classes.
13D/G row: BlackRock, Inc.
Showing 1-8 of 50 holder rows.
Quick read
BlackRock, Inc. leads the comparable SEC ownership view at 12%.
3 of 50 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 BlackRock, Inc.'s linked filing trail.
Comparable ownership
Top 3
BlackRock, Inc.
12%
VANGUARD CAPITAL MANAGEMENT LLC
7.2%
FMR LLC
3.3%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| BlackRock, Inc. |
13D/G
13F
Company
|
12%
Reported 13D/G
· 30 Sep 2026
|
$827,778,622
12,897,766 shares
|
+$284,018,385 | 30 Sep 2026 |
| VANGUARD CAPITAL MANAGEMENT LLC |
13D/G
13F
Vanguard Capital Management · Company
|
7.2%
Reported 13D/G
· 31 Mar 2026
|
$656,337,806
7,972,037 shares
|
$0 | 31 Mar 2026 |
| FMR LLC |
13D/G
13F
Company
|
3.3%
Reported 13D/G
· 28 Nov 2025
|
$441,564,014
3,699,740 shares
|
-$975,081,623 | 28 Nov 2025 |
| STATE STREET CORP |
13F
Company
|
—
denominator unverified
|
$433,067,055
4,839,758 shares
|
— | 30 Jun 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
Company
|
—
denominator unverified
|
$372,426,140
4,162,116 shares
|
— | 30 Jun 2026 |
| Capital International Investors |
13F
Company
|
—
denominator unverified
|
$349,627,083
3,907,321 shares
|
— | 30 Jun 2026 |
| Pictet Asset Management Holding SA |
13F
Company
|
—
denominator unverified
|
$340,120,280
3,801,076 shares
|
— | 30 Jun 2026 |
| WELLINGTON MANAGEMENT GROUP LLP |
13F
Company
|
—
denominator unverified
|
$310,070,659
3,465,251 shares
|
— | 30 Jun 2026 |
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.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to buying over the last 12 months. Net value: +$3,995,650.
Buys
$4,386,500
Insiders: 1
Sells
$390,850
Insiders: 1
Net
+$3,995,650
Shares: +45,000
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 50,000
Shares: 5,000
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 5,000 | $0 | $390,850 | -$390,850 |
| 6-9 | 50,000 | 0 | $4,386,500 | $0 | +$4,386,500 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 33 reporting-owner rows connected to Builders FirstSource, Inc.. Open a relationship link for the CIK-to-CIK filing trail.
Rows
33
Largest Forms 3/4/5 holder
Paul S. Levy
Net 12M change
+$4M
Full value: +$3,995,650 · USD · 12-month changeLatest report
18 Oct 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Paul S. Levy | Director | $154,979,538 | +$4,386,500 | +2.9% | Mixed | 10 Sep 2026 |
| David E. Flitman | President and CEO, Director | $62,427,275 | Mixed | 15 Mar 2022 | ||
| Peter M. Jackson | President & CEO, Director | $34,972,875 | Mixed | 15 Mar 2026 | ||
| Scott L. Robins | President - West Division | $19,423,139 | Mixed | 15 Mar 2026 | ||
| David W. Bullock | Director | $14,553,951 | Mixed | 15 Jun 2021 | ||
| Pete Beckmann | Evp & Cfo | $10,469,439 | Mixed | 15 Mar 2026 | ||
| Jami Beckmann | Principal Accounting Officer | $10,398,186 | Mixed | 22 May 2024 | ||
| David E. Rush | Director | $10,278,241 | -$390,850 | -3.7% | Mixed | 14 May 2026 |
| Michael Alan Farmer | President - Commercial Ops | $9,967,826 | Mixed | 22 May 2024 | ||
| Timothy D. Johnson | EVP & General Counsel | $9,921,470 | Mixed | 22 Aug 2025 | ||
| Craig Arthur Steinke | Director | $9,182,974 | Mixed | 10 Sep 2026 | ||
| Stephen J. Herron | Chief Operating Officer | $9,077,705 | Mixed | 05 Jun 2026 | ||
| James Oleary | Director | $8,213,816 | Mixed | 10 Sep 2026 | ||
| Brett N. Milgrim | Director | $6,803,257 | Mixed | 14 May 2026 | ||
| Daniel Agroskin | Director | $5,307,413 | Mixed | 01 Jun 2022 | ||
| Amy B. Messersmith | Chief People Officer | $4,324,016 | Mixed | 22 May 2024 | ||
| Mark A. Alexander | Director | $3,944,677 | Mixed | 01 Jun 2026 | ||
| Todd Vance | President - East Division | $3,819,364 | Mixed | 18 Jul 2026 | ||
| Michael Hiller | COO-Designate | $3,702,799 | Median | 18 Oct 2026 | ||
| Paul Vaughn | President - West Division | $3,643,983 | Mixed | 18 Jul 2026 |
Recent insider transactions for Builders FirstSource, Inc.
Showing up to 300 recent insider transactions from the last 12 months.
* marks a reported price that did not pass the local price check.