It was founded by Chew Weng Khak in 1965 as a shop in Penang selling electrical appliances trading under the name of Keat Radio Co. with Chew as a sole proprietor.

In 1982, Chew started the Pensonic brand name to produce locally manufactured electrical appliances.

[1] In 2008, Panasonic won an injunction against Pensonic in Singapore.

[2] In Sri Lanka, Pensonic successfully won a judgement to register its trademark in January 2009 against opposition by Panasonic.

The judgment observed that Pensonic was previously registered in Malaysia, Japan, and many other countries without the objection of Panasonic.