Neilson Active Holidays plans to reduce its UK workforce by up to 30%, citing its inability to operate any holidays since mid-March.
Chief executive David Taylor confirmed in a statement issued to TTG on Thursday (18 June) up to 28 roles were at risk of redundancy. Staff have been briefed.
The firm employs nearly 100 people at its UK head office in Brighton.
Neilson said besides being unable to operate, it had seen a "significant downturn" in bookings over the past three months.
“The impact of Covid-19 has been worse than any of us could have imagined, leading to a total shutdown across the travel sector," said Taylor.
"My team have responded magnificently to this crisis as we have dealt with the repatriation of thousands of customers in March and subsequently cancelling, rearranging and refunding the bookings of thousands more.
"Many staff working through this crisis have taken pay cuts, and many more staff have been patiently waiting at home while on furlough with their fingers crossed that this crisis will pass."