The companies have all pulled out of the show, which is due to be held in Barcelona at the end of this month, due to fears over coronavirus outbreak.
In a statement, Sony said its press conference, where it's expected to show off its latest Xperia flagship, will go ahead as scheduled, but would now be live-streamed via the internet.
"As we place the utmost importance on the safety and wellbeing of our customers, partners, media and employees, we have taken the difficult decision to withdraw from exhibiting and participating at MWC 2020 in Barcelona, Spain," the company said.
The GSMA, the organization that runs MWC, said it will have additional medical personnel on-site. It will also put other measures in place to reduce the risks posed by the disease, including a no-handshake policy.
In spite of assurances from the GSMA, many companies have decided it's not worth risking the health of their employees to attend. Samsung still plans to attend the show, but has said it is.
The GSMA did not immediately respond to request for comment.