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Mountaineer Partners Management, LLC

Position in ATI — Ati Inc

CIK 1730532 New York, NY

Position in ATI

as of Jun 30, 2026 · filed Aug 13, 2026
Position Value
$11,908,584
-$1,442,316 QoQ
Shares Held
60,419
-34.2% QoQ
Ownership
0.044%
of shares outstanding
% of Portfolio
8.84%
of 13F equity value
Holder Rank
#162
of 787 holders
Holding Since
Mar 2020
25 quarters on record
Voting authority Sole 80% Shared 0% None 20%

Common Shares in ATI Over Time

Shares Held

Position Value (USD)

Position in Metal Fabrication

Industrials · as of Jun 30, 2026

Mountaineer Partners Management, LLC holds $24,796,838 across 2 Metal Fabrication names. ATI ranks #2 (48.0% of the industry book) .

# Ticker Company Shares Value (USD) Open
2 ATI
Ati Inc
This page
60,419 $11,908,584

All Filings in ATI

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25 filing rows on record
Report Date Value (USD) Shares
2026-06-30 $11,908,584 60,419
2026-03-31 $13,350,900 91,784
2025-12-31 $14,793,596 128,909
2025-09-30 $11,714,585 144,020
2025-06-30 $10,617,228 122,970
2025-03-31 $9,436,941 181,375
2024-12-31 $10,054,156 182,670
2024-09-30 $9,410,891 140,650
2024-06-30 $11,593,097 209,073
2024-03-31 $12,096,383 236,396
2023-12-31 $11,451,118 251,839
2023-09-30 $10,285,853 249,960
2023-06-30 $11,005,706 248,829
2022-12-31 $5,840,286 195,589
2022-09-30 $5,601,591 210,507
2022-06-30 $4,780,613 210,507
2022-03-31 $5,650,007 210,507
2021-12-31 $10,503,986 659,384
2021-09-30 $9,350,749 562,282
2021-06-30 $9,108,092 436,839
2021-03-31 $9,208,252 437,239
2020-12-31 $7,213,480 430,142
2020-09-30 $2,878,837 330,142
2020-06-30 $3,364,146 330,142
2020-03-31 $2,876,680 338,433