Altor is a Nordic private equity firm founded in 2003 and headquartered in Stockholm, Sweden. The firm focuses on leveraged buyout and growth capital investments in medium-sized companies across the Nordic and DACH regions, with sector focus on business services, consumer, financial services, industrial, and technology.
31% of their portfolio is in Climate & Energy. Average disclosed round size is $192.1M (across 5 rounds with reported amounts).
Portfolio
8
Fund Size
$3.3B
Top Stage
Unknown
Last 12 Mo
0
Team
Portfolio Breakdown
Stage Distribution
Sector Distribution
Investment Activity
DealsAvg Round Size
Portfolio
13 investments
| Company | Round | Amount | Date |
|---|---|---|---|
 Aira | Series C | $150M | Aug 2025 |
 Aira | Series C | $150M | Aug 2025 |
| Aira | Series B | — | Jan 2024 |
| Aira | Series B | $14.5M | Jan 2024 |
 H2 GREEN STEEL | Series B | — | Jan 2023 |
| SSvea Solar | Growth | $230M | Jan 2022 |
| Aira | Series A | — | Jan 2016 |
| Aira | Series A | — | Jan 2016 |
 Stegra | Unknown | — | — |
| OOW Bunker | Unknown | — | — |
| WWrist Ship Supply | Unknown | $416M | — |
 Marshall Group | Unknown | — | — |
| H2 GREEN STEEL | Series C | — | — |
Top Co-Investors
Kinnevik7 shared
Vargas Holding5 shared
Collaborative Fund4 shared
Lingotto Investment Management4 shared
In-Q-Tel3 shared
Just Climate2 shared
Nesta Impact Investments2 shared
Lux Capital2 shared
ARCH Venture Partners2 shared
JAZZ Venture Partners2 shared
Statkraft Ventures2 shared
BNP Paribas2 shared
Felicis2 shared
Intel Capital2 shared
Juniper Networks1 shared
Acrew Capital1 shared
Neotribe Ventures1 shared
AT&T Ventures1 shared
Exor Ventures1 shared
Last updated: 20 October 2026