DOSSIER · 13F-HR · Q1 2026

Millstreet Capital Management LLC

$418M in tracked AUM across 2 positions as of Q1 2026.

MC
CIK 0001590729 · last filed Mar 31, 2026
Total AUM
$418M
as of Q1 2026
Holdings
2
positions
Whale Score
69
69
tracked
Activity
no data
changes this Q
AI Analysis · Q1 2026

Based on the SEC 13F filing data provided for Millstreet Capital Management LLC as of September 30, 2025, here is a comprehensive analysis.

1. Portfolio Overview

Millstreet Capital Management LLC currently exhibits an extremely concentrated portfolio structure, effectively resembling a "single-stock" investment strategy for the reporting period. The total portfolio value has plummeted by 90.3%, decreasing from approximately $353.95 million in the previous quarter to $34.42 million. This dra...

2. Key Holdings

The portfolio is entirely composed of Cooper Standard Holdings Inc., which represents 100% of the total value at $34.42 million. The position consists of 932,000 shares. The fact that this is the sole remaining holding implies that Millstreet Capital Management views this specific position as distinct from its other divested interests, or perhaps it is a legacy position being managed separately from the rest of the liquidated portfolio. Cooper Standard is an automotive supplier, and the retention of this specific equity suggests the firm may still see specific value or potential upside in this name that was not present in the assets that were sold.

3. Sector Allocation

The sector allocation is currently listed as 100% "Unknown" or unclassified in the provided summary, but based on the identity of the sole holding, the exposure is entirely to the Automotive/Industrial Manufacturing sector. The elimination of all other positions has removed any previous sector diversification the firm may have had. This creates a high-risk profile where the portfolio's performance is entirely dependent on the operational and market performance of Cooper Standard Holdings Inc. and the broader automotive supply chain.

Quarter at a glance — Q1 2026

Position-change comparison pending.

No quarter-over-quarter changes available.

Top 10 holdings

By portfolio weight as of Q1 2026.

#HoldingValueSharesWeight
01
DBD
DIEBOLD NIXDORF INC
$394M5.2M94.2%
02
DEC
DIVERSIFIED ENERGY CO
$24M1.4M5.8%

Filing history

2026Q1Mar 31
$418M 4.8%
2 positionsView →
2025Q4Dec 31
$439M 1174.5%
3 positionsView →
2025Q3Sep 30
$34M 90.3%
1 positionsView →
2025Q2Jun 30
$354M 2379.0%
2 positionsLocked
2025Q1Mar 31
$14M 94.9%
1 positionsLocked
2024Q4Dec 31
$279M 4.2%
3 positionsLocked
2024Q3Sep 30
$291M 15.7%
3 positionsLocked
2024Q2Jun 30
$252M 2.9%
3 positionsLocked
2024Q1Mar 31
$259M 5.3%
4 positionsLocked
2023Q4Dec 31
$246M
4 positionsLocked