Google has said it is no longer planning to take part in Web Summit in Lisbon next month.
It is also understood that Meta will also not be attending.
It follows similar decisions by Intel and Siemens not to take part in the biggest technology conference in Europe after remarks by the event's founder, Paddy Cosgrave, that criticised Western support for Israel after the Hamas attacks.
"We will not longer have a presence at Web Summit," a Google spokesperson said.
A number of speakers from the company were due to take part in the event and it was due to have a stand there.
US chipmaker Intel confirmed yesterday that it was withdrawing from Web Summit.
A representative for the California-based company, which has longstanding operations in Israel, declined to comment further. Intel also has major operations in Leixlip, Co Kildare.
Siemens, the German engineering and manufacturing company, is listed as one of the top sponsors of the summit scheduled for next month in Lisbon.
But after having "reviewed the situation," the company will no longer be a partner or attend the event this year, a representative said.
Y Combinator's Garry Tan, Sequoia Capital’s Ravi Gupta and other prominent venture capitalists also have cancelled plans to attend the event.
Several tech executives based in Israel have dropped out as well.
It has also been reported that actress Gillian Anderson would not attend the conference in Lisbon.
Paddy Cosgrave issued an apology for his comments earlier this week.
"I understand that what I said, the timing of what I said, and the way it has been presented has caused profound hurt to many," he said on the Web Summit site. "To anyone who was hurt by my words, I apologise deeply".
He initially posted about the conflict last week and reiterated the sentiment in subsequent posts.
Earlier this week, the Israeli Ambassador to Portugal, said his country would not be participating in next month's Web Summit in Lisbon, because of Mr Cosgrave’s comments, describing them as "outrageous statements".
Dor Shapira claimed dozens of companies had already cancelled their participation in the conference and he encouraged others to do so.
On Friday, Mr Cosgrave wrote in a post on X that he was "shocked at the rhetoric and actions of so many Western leaders and governments, with the exception in particular of Ireland’s government, who for once are doing the right thing."
"War crimes are war crimes even when committed by allies, and should be called out for what they are," he stated.
That tweet was met with strong and at times angry responses by a range of tech figures and others.
The withdrawal of the two tech giants was first reported by the Business Post.
The Web Summit was originally set up and held in Dublin before being moved to Lisbon in 2015.
