He said: "We appreciate and respect that there are a range of reasons that motivate people on both sides of the debate, but as a business that is very committed to this country, our view is that the UK should remain in the EU.
The company employs over 5,000 people and works with 25,000 businesses.
However, the company indicated that it will not stop operations in the UK if the country votes in favour of Brexit.
At the same time, Hewlett Packard Enterprise UK managing director Andy Isherwood sent a note to the staff, saying that the UK should remain in the EU.
Last month, IBM UK boss David Stokes said in an internal blog to staff, "As a large, globally integrated business with a strong presence across the EU, IBM sees significant benefits from EU economic integration.
techUK polled 277 tech business leaders, three-quarters of which were SMEs, and identified a clear majority for the In camp.