Jobs are set to go at Aston Martin's manufacturing plant at St Athan as part of a cost cutting plan.
The luxury carmarker says 170 jobs will go - around 5% of its workforce - to help meet annual savings of 25 million pounds.
It's not known how many workers at St Athan will be affected - but it's believed around 150 jobs will go in the UK, including its headquarters at Gaydon in Warwickshire.
The company has struggled with growing losses and production issues that have seen the launch of its first battery-powered vehicle delayed for a second time.
It's understood a staff consultation is underway as part of what's been described as a "difficult but necessary" plan to cut costs.
Although the number of staff at risk in St Athan is unknown, Aston Martin's chief executive says the company remains committed to manufacturing in the Vale of Glamorgan.
Adran Hallmark told investors on Wednesday: "If I look at the cost of St Athan and the efficiency of it, even though we have two sites, so do Porsche."
"We don't have the space in Gaydon to build everything. St Athan has an amazing facility that has huge opportunities to be even more efficient. There's no fundamental review of that currently on the table."
Aston Martin recently reported an increase in pre-tax losses to £289.1 million and a 3% drop in revenue to £1.58 billion.
The carmaker's debts also grew to £1.16 billion last year amid falling sales, supply chain issues and weakened economic demand in China.

Adrian Hallmark said: "After a period of intense product launches, coupled with industry-wide and company challenges, our focus now shifts to operational execution and delivering financial sustainability."
"I see great potential in Aston Martin, and our goal is to transition from a high-potential business to a high-performing one, better equipped to navigate future opportunities and uncertainties."
The St Athan plant was officially opened in December 2019, specificially to build Aston Martin's first SUV (sports utility vehicle), the DBX 707.
Last February, the company announced it was taking on an extra 400 workers at both of its UK manufacturing sites for increased production.
Aston Martin has sought to move towards electric car - prioritising plug-in hybrid vehicles including a small battery and a petrol engine.
But the first such model is not expected until next year at the earliest - and it could even be delayed further into the latter half of the decade.

Vueling withdraws winter flights to Aicante this winter
Playground in Barry forced to close after fire damages equipment
Campaigners Take Fight for Fairer Pathways in Welsh Women’s Football to Parliament
Vale Councillor Gwyn John Launches His First Novel at Llantwit Major Book Signing
Pink poppy display commences with celebration of life
Former Barry office block converted into new homes for people at risk of homelessness
Welsh Government publishes independent report on Level 4 intervention at Cardiff and Vale UHB
Three CoastSnap stations set to be installed along the Glamorgan Heritage Coast
Daffodil Runner statue installed at Marie Curie Hospice in Penarth
Woman Dies After Incident in Leckwith as Police Investigation Continues
Vale entrepreneur wins national Innovate UK award for sustainable construction technology
Cardiff Airport retains top accessibility rating as regulator reports record demand for assistance
Open Doors event to showcase hidden world of Glamorgan Archives
New details have emerged of a new tree-lined public square that will replace a traffic dominated junction
Dyffryn Gardens’ Edwardian rose garden blooms again after decade-long restoration
Barry’s Own Daniel White to Walk 190 Miles Back to Where His Round Table Story Began
1,300 people attend Flying Start Family Fun Day
Dispersal order put in place to tackle anti-social behaviour
Interim Chief Executive Appointed at Cardiff and Vale University Health Board
Cardiff Theatre Marks 50 Years of Service for Long‑Standing Staff Member