Five separate companies, all operating as self-standing units, are now one.

五个全部独立经营的分立的公司，现在合并了。

《柯林斯英汉双解大词典》

When IT is operating as it should, employee self-confidence swells.

当 IT 正常运行时，员工的自信心就会增强。

youdao

A man sits safely self-composed operating azimuth circle.

一个男子坐在那里，安然自若地操控着方向盘。

youdao

The car is self-operating, so use the wall-mounted phone to ring the mountain station before boarding, then pay the 13 Swiss franc round-trip fare as you exit.

BBC: In Swiss utopia, the devil dwelled

Napcabs are 4-square-meter, self-service booths operating in Terminal two of Munich Airport.

CNN: Airports' tiniest hotels: Sleeping in a box

Those are mostly self-employed people operating unincorporated businesses.

FORBES: Private companies pull economy along