Mountaineer Partners Management, LLC
Position in BLDR — Builders FirstSource, Inc.
CIK 1730532
New York, NY
Position in BLDR
as of Mar 31, 2026
· filed May 15, 2026
Position Value
$8,085,052
-$1,595,970 QoQ
Shares Held
98,203
+4.4% QoQ
Ownership
0.091%
of shares outstanding
% of Portfolio
4.02%
of 13F equity value
Holder Rank
—
not a current holder
Holding Since
Mar 2020
11 quarters on record
Voting authority
Sole 82%
Shared 0%
None 18%
Common Shares in BLDR Over Time
Shares Held
Position Value (USD)
All Filings in BLDR
Export CSV
11 filing rows on record
| Report Date | Value (USD) | Shares | Type | Discretion | Filed | |
|---|---|---|---|---|---|---|
| 2026-03-31 | $8,085,052 | 98,203 | Shares | Sole | 2026-05-15 | |
| 2025-12-31 | $9,681,022 | 94,091 | Shares | Sole | 2026-02-13 | |
| 2025-09-30 | $7,367,028 | 60,759 | Shares | Sole | 2025-11-14 | |
| 2025-06-30 | $7,288,924 | 62,464 | Shares | Sole | 2025-08-14 | |
| 2025-03-31 | $7,272,882 | 58,211 | Shares | Sole | 2025-05-15 | |
| 2024-12-31 | $7,986,213 | 55,875 | Shares | Sole | 2025-02-14 | |
| 2024-09-30 | $10,831,927 | 55,875 | Shares | Sole | 2024-11-15 | |
| 2020-12-31 | $10,215,844 | 250,327 | Shares | Sole | 2021-02-12 | |
| 2020-09-30 | $9,716,420 | 297,867 | Shares | Sole | 2020-11-13 | |
| 2020-06-30 | $5,573,826 | 269,267 | Shares | Sole | 2020-08-13 | |
| 2020-03-31 | $3,329,824 | 272,267 | Shares | Sole | 2020-05-14 | |
| No filing history on record for this holder in this stock. | ||||||