Co Antrim bus company Wrightbus has said it has a full order book between now and the end of the year but that it will not be reversing its restructuring plans.
Business Telegraph can also reveal that the business worked to save a small supplier in the town from insolvency by paying for goods in advance.
It is also planning to launch a new zero-emissions bus early next year.
Ballymena company Advance Engineering, led by ex-Wrightbus owner Jeff Wright and fellow pastors from the evangelical Green Pastures Church, went into administration last week with the loss of 30 jobs.
The board of directors blamed the administration of a key customer - a reference to Wrightbus, which itself went bust last year - as well as the impact of Covid-19 and lockdown.
The board of Advance Engineering appointed Brian Hegarty of HannawayCA Business Recovery as administrator.
Wrightbus has had a new lease of life since its administration after it was bought over by industrialist Jo Bamford, whose father Anthony is chairman and owner of equipment company JCB.
Wrightbus chief executive Buta Atwal said it had attempted to help Advance Engineering survive, but to no avail.
The smaller business carried out work including laser cutting and upholstery as well as acoustic and heat insulation work.
It also produced items such as single and double-deck bus rear frames, seat-box assemblies and high-volume corner assemblies.
Mr Atwal said: "Advance Engineering was a supplier of ours and we were made aware that it was going through financial difficulties, so we were not surprised when the administrators were called in.
"We had agreed to pay for goods in advance in an attempt to help with its cash flow situation but, despite this, our support unfortunately wasn't enough to keep it from going into administration.
"We're currently working with the administrators to ensure minimum impact on our business but clearly we are deeply disappointed at this turn of events. We're working hard to create a sustainable situation where the success of Wrightbus enables others in the supply chain to also become successful.
"We want a strong manufacturing network around us to help create stable employment opportunities in Northern Ireland."
He said the company's order book was full between now and the end of the year but that it would not be going back on a plan to restructure the business, including letting go 35 permanent staff and releasing 90 agency staff.
The reductions leave it with a staff of 575.
Mr Atwal said: "We restructured in early March as the effects of Covid were becoming apparent and nothing has changed with that plan.
"We have a full order book until Christmas, and we continued to invest in engineering throughout the furlough period, resulting in the development of a significant new zero emissions product being developed that will be launched in the New Year.
"This is a truly exciting time for Wrightbus as we deliver 15 of the world's first hydrogen double-deckers into Aberdeen and a further 20 into London later this year."