Dale Farm head David Dobbin was speaking as the processing firm unveiled a new £2.5m cheese packing line at its County Tyrone plant.
It ends a £7m investment at Cookstown that created 60 jobs.
He said the industry wanted a free-trade deal giving access to EU markets.
Mr Dobbin added that a couple of future investment projects would depend on the outcome of trade negotiations with the EU.
But he said the bulk of them would go ahead regardless.
As much as £70m worth of sales is being generated by the Cookstown plant.
Much of the cheese is destined for customers in Britain, with the rest serving markets in Europe, the West Indies and the United States.
Mr Dobbin said the company was "well-hedged" in relation to future trade arrangements.
He said any tariffs would make imports more expensive, allowing UK companies to sell more produce to the domestic market.
If a free-trade deal was concluded with the EU, Dale Farm could continue to grow its European business, he added.
Economy Minister Simon Hamilton attended the launch of the facility that received more than £500,000 pounds of public money.
He said he was keen to work with companies to help them overcome the challenges and seize opportunities the UK's withdrawal from the EU would present.
Mr Hamilton added that agri-food is a key element of the Northern Ireland economy and one that had "defied the odds" during the downturn.
Earlier this month, the first and deputy first ministers wrote to the prime minister calling for an open trading arrangement with the EU and highlighting the importance of agri-food to the wider Northern Ireland economy.

The "Co-bikes" are currently available from five sites in Exeter, including the central train station, the university and Sowton Park and Ride.
It's hoped that by spring 2017 there will be eight hubs around the city.
The initiative has been launched with support from Department of Transport, while Devon County Council has helped to fund the scheme.
Mark Hodgson, Managing Director of Co-bikes, said: "After years of planning, we're very excited to be launching Co-bikes in Exeter.
"The Co-bikes electric bikes are changing the way that people travel around the city and are affordable and easy as well as being great fun to ride", he added.
For people who choose to become members, the service will cost 75p for 30 minutes, while non-members will pay double.
The bikes have small electric motors which can travel distances of between 40 and 60 miles, and allow speeds of up to 15mph.

Most swimmers will be take to the waters of Windermere to swim a mile (1.6Km) with some longer swims scheduled for Sunday.
The event is expected to attract 10,000 swimmers, organisers said.
A 10k marathon distance has also been introduced and is expected to take experienced swimmers four hours to complete.
Great Swim Director Alex Jackson said: "The Great North Swim is proving to be as popular as ever, with 10,000 expected in Windermere for our ninth event here."
Introducing the "10k event will provide a new challenge" he added.
Twenty million pounds of investment in one of Northern Ireland's biggest agri-food companies is set to go ahead regardless of the outcome of negotiations over Brexit.
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The UK's first city-wide electric bike scheme has been launched in Exeter.
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Thousands of swimmers have headed to the Lake District this weekend to take part in the Great North Swim.