Hallstatt Advisors L.P.
In its 13F for Q1 2026 (holdings as of March 31, 2026, filed May 7, 2026), Hallstatt Advisors L.P. reported 15 stock positions worth $126.4 million. Its top holding was Granite Construction (GVA) at 12.6% of the portfolio, followed by GFL Environmental Inc.-Sub VT (GFL, 10.5%) and Clean Harbors (CLH, 10.5%). Compared with Q4 2025, it opened 4 new positions, sold out of 5, added to 4 and reduced 7. The biggest buy was a new position in Vistra (VST) and the biggest sale Aercap (AER, shares −89%).
- Most Recent 13F
- Q2 2026
- Location
- NEW YORK, NY
- CIK
- 0002040638
- Portfolio Value
- $126.4M (Q1 2026)
- SEC Filing
- 0001214659-26-005718 ↗ filed May 7, 2026
Holdings Value
Holdings 15 stocks · $126.4M
| GVA Granite Construction Inc. | 12.56% | 132,484 | $15.9M | Reduce -6.0% |
| GFL GFL Environmental Inc.-Sub VT | 10.54% | 319,272 | $13.3M | Add +65.0% |
| CLH Clean Harbors Inc. | 10.46% | 46,115 | $13.2M | Reduce -29.2% |
| CWST Casella Waste Systems Inc. Class A | 10.38% | 165,385 | $13.1M | Add +13.9% |
| TEL Te Connectivity PLC | 8.75% | 52,924 | $11.1M | Add +45.2% |
| VST Vistra Corp. | 8.21% | 69,077 | $10.4M | New |
| CTRI Centuri Holdings Inc. | 6.60% | 285,721 | $8.3M | Reduce -17.1% |
| SECYF Secure Waste Infrastructure | 6.23% | 501,743 | $7.9M | New |
| EXP Eagle Materials Inc. | 5.59% | 37,323 | $7.1M | Add +2.9% |
| BDC Belden Inc. | 5.59% | 61,576 | $7.1M | New |
| MRVL Marvell Technology Inc. | 5.47% | 69,828 | $6.9M | Reduce -28.0% |
| SEI Solaris Energy Infrastructur | 5.37% | 120,209 | $6.8M | New |
| MT Arcelormittal-NY Registered | 2.86% | 69,489 | $3.6M | Reduce -62.9% |
| AER Aercap Holdings NV | 1.09% | 10,040 | $1.4M | Reduce -89.2% |
| SMERY Siemens Energy AG Spon ADR | 0.28% | 2,125 | $359K | Reduce -54.0% |
Portfolio Sells Q4 2025 → Q1 2026
| AER Aercap Holdings NV | Reduce -89.2% | 1.09% | −8.90 |
| IEX Idex Corp. | Sold out | 0.00% | −6.15 |
| HUBG Hub Group Inc. Class A | Sold out | 0.00% | −4.25 |
| EMR Emerson Electric Co. | Sold out | 0.00% | −4.15 |
| MT Arcelormittal-NY Registered | Reduce -62.9% | 2.86% | −3.51 |
| FSLR First Solar Inc. | Sold out | 0.00% | −2.06 |
| OC Owens Corning | Sold out | 0.00% | −1.93 |
| CLH Clean Harbors Inc. | Reduce -29.2% | 10.46% | −0.91 |
| MRVL Marvell Technology Inc. | Reduce -28.0% | 5.47% | −0.67 |
| SMERY Siemens Energy AG Spon ADR | Reduce -54.0% | 0.28% | −0.15 |
| CTRI Centuri Holdings Inc. | Reduce -17.1% | 6.60% | +0.12 |
| GVA Granite Construction Inc. | Reduce -6.0% | 12.56% | +0.45 |
Portfolio Buys Q4 2025 → Q1 2026
| VST Vistra Corp. | New | 8.21% | +8.21 |
| SECYF Secure Waste Infrastructure | New | 6.23% | +6.23 |
| BDC Belden Inc. | New | 5.59% | +5.59 |
| SEI Solaris Energy Infrastructur | New | 5.37% | +5.37 |
| GFL GFL Environmental Inc.-Sub VT | Add +65.0% | 10.54% | +4.34 |
| TEL Te Connectivity PLC | Add +45.2% | 8.75% | +2.57 |
| EXP Eagle Materials Inc. | Add +2.9% | 5.59% | +0.01 |
| CWST Casella Waste Systems Inc. Class A | Add +13.9% | 10.38% | −0.21 |