Klenk & Sohn GmbH operates primarily in telecommunications and is specialized in constructing passive infrastructure for the nationwide FTTB broadband network. Historically the company was active in FTTC rollouts; since 2019 FTTB has defined the majority of its projects. As a general contractor Klenk & Sohn delivers turn-key projects providing planning, civil works, cable installation, assembly and documentation; total performance in the reporting year amounted to €70.5m. To broaden its offering the company founded PEB GmbH & Co. KG together with regional carrier ENTEGA Medianet to provide active and passive network solutions from a single source, and it is expanding activities in electricity network construction. Klenk & Sohn GmbH is a family business.
ist der Bau von Versorgungsanlagen im Fernmeldebau, Tiefbau und im Elektroinstallationswesen, sowie der Verkauf entsprechender Maschinen, Geräte, Apparate und Einrichtungsgegenstände (Einzel- und Großhandel).
Converted using the official Destatis and Eurostat correspondence tables; ISIC Rev. 4 is the United Nations' international industry classification.
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Source: German Commercial Register (Handelsregister) Darmstadt Local Court, HRB 2663 (as of 31 October 2026)
| Name | Type | City |
|---|---|---|
| Sebastian Jacobs | Geschäftsführer(in) | Modautal |
| Udo Klenk | Geschäftsführer(in) | Modautal |
| Paul Quiskamp | Geschäftsführer(in) | Modautal |
Source: German Commercial Register (Handelsregister) Darmstadt Local Court, HRB 2663 (as of 31 October 2026)
| Year | Revenue | Profit | Balance | Employees |
|---|---|---|---|---|
| 2024 | Rohergebnis€35.3M2 | €13,498,126 | €43,353,123 | — |
| 2023 | Rohergebnis€27.8M2 | €7,958,307 | €31,685,655 | — |
| 2022 | Rohergebnis€20.8M2 | €4,952,959 | €22,225,840 | — |
| 2021 | Rohergebnis€16.3M2 | €2,561,440 | €20,329,450 | — |
| 2020 | Rohergebnis€14.5M2 | €1,577,678 | €17,197,823 | — |
| 2019 | Rohergebnis€15.6M2 | €1,574,966 | €19,787,659 | — |
| 2018 | Rohergebnis€16.4M2 | €3,040,510 | €20,958,860 | — |
| 2017 | Rohergebnis€11.2M2 | €549,411 | €14,136,632 | — |
| 2016 | Rohergebnis€10.3M2 | €398,627 | €16,019,262 | — |
| 2015 | Rohergebnis€5.1M2 | €431,901 | €19,078,847 | — |
1 Small companies are not required to publish a profit-and-loss statement (§ 326 (1) HGB). The figure shown is the statutory ceiling under § 267 HGB where the balance-sheet total makes it binding — a company may exceed at most one of the three size criteria.
2 Rohergebnis nach § 276 HGB: Umsatzerlöse abzüglich Materialaufwand bzw. Herstellungskosten. Kleine und mittelgroße Kapitalgesellschaften dürfen diese Posten zusammenfassen; die Umsatzerlöse selbst sind dann nicht veröffentlicht und liegen über dem Rohergebnis.
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Source: German Commercial Register (Handelsregister) Darmstadt Local Court, HRB 2663 (as of 31 October 2026)
| Cost type | Amount | Share |
|---|---|---|
| Personnel Costs | €9,320,602 | 97.2% |
| Depreciation | €166,966 | 1.7% |
| Interest & Similar | €102,140 | 1.1% |
