What is the ruling on profit from a private project that was implemented using the company's money and equipment? Is it permissible to keep it, or should it be returned to the company, or divided between the two parties?

The first issue: The ruling on the work of the questioner and the company's employees on this project, and what they earned from it. If the work was outside working hours, there is no harm in it, and the earnings belong to the individual. If it was during working hours, it is not permissible except with the company's permission. If it was without their permission, then he is sinful. There is a difference of opinion regarding his entitlement to the full wage. If it harmed the company's work, then what he earns from the other work belongs to the company owner or to the extent of the harm inflicted upon the company.

The second issue: Using company equipment without the owner's permission is considered usurpation, which requires repentance, along with guaranteeing the benefits of what was usurped with a standard rental fee, even if no benefit was gained from it. Accordingly, the company is entitled to a standard rental fee from the questioner for these pieces of equipment for the entire duration of their use in this project. And Allah knows best.