Sociedade Eletro-Mercantil Paulista Ltda.
Rua 24 de Maio 32, São Paulo (1946)

SEMP Rádio e Televisão S.A.
Rua Dr. Ubaldino do Amaral 109, São Paulo (1954)
Rua Liberdade 646, São Paulo (1958)

SEMP S.A.
Avenida Amaldo Rojek 1, Cajamar (1977)

SEMP Toshiba Amazonas S.A.
Rua Içá 500, Manaus (2002)

SEMP TCL S.A.
Cajamar (2016)

There are many more subsidiaries with different addresses.

SEMP is today one of the largest electronics manufacturers in Brazil with an extensive product portfolio. Semp produces audio, video and computer products as well as home applicances.

The Sociedade Eletro-Mercantil Paulista was founded by Affonso Brandão Hennel in 1942 [2][5] ([1] claims a date of 1939), in the city of São Paulo.

In 1949 they produced the first radio-phono combination, and in 1951 - less than a year after the start of TV broadcasting in Brazil - the first fully locally made TV set. 

The company was transformed into SEMP Rádio e Televisão S.A. on 20 Feb. 1953. At this time, the company objective also already included the manufacture of motors, refrigerators, fans and other related material.[6]

In 1954 they had an average output of 4500 sets per month, shared between radios, TVs and radiograms, additionally manufacturing cabinets, chassis, transformers and coils for internal use.[1]

In 1973 a manufacturing site in Manaus (Amazonas state) was opened.

In 1977 SEMP entered into a a joint venture with Toshiba, with 60% of the share remaining with the founders, the Hennel family. 

This partnership lead to the establishment of Semp Toshiba Informática Ltda. in 1988 [4], which manufactured personal computers.

In the early 2000s SEMP began marketing a line of  high value products under the Infinity brand.

In 2005 the group launched the brand STi, with a focus on IT and audio-video products.

The partnership with Toshiba was terminated in 2007.[3]

In 2016, a new joint-venture with the Chinese manufacturer TCL was set up, with Hennel retaining 60% of the firm. From that date on, SEMP also marketed home appliances.

In June 2020, TCL took control of the company by increasing its stake to 80%.[3]

[1] Article about the new SEMP factory, published 1954, on rm.org
[2] wikipedia.br, retrieved Oct 2021
[3] 4 June 2020 blog entry on hometheater.com.br
[4] Junta Comercial do SP, company records archive
[5] semptcl.com.br, company history
[6] O Estado de São Paulo, 1 March 1953, p.20