Thames Valley Police is appealing for witnesses to an aggravated burglary in Tilehurst on Wednesday, March 23.
At around 4.50pm, a man with a knife stole a large quantity of cash from a business on School Road before leaving on foot towards Armour Road.
The man is described as white, of slim build, around 5ft 10-11ins tall, wearing a dark blue or black T-shirt and black trousers and carrying a black rucksack over one shoulder.
Sergeant Sam Toulson, based at Reading police station, said: “I am appealing for anyone who may have witnessed this incident or have information about it to please get in touch.
“Also, if you have any CCTV footage or any dash-cam footage if you were in the area around the time, I’d also ask that you check any recordings in case it has captured something that could assist our investigation.
“You can make a report by calling 101 or via our website, quoting reference 43220121190.”
“Alternatively, you can report information anonymously to the independent charity, Crimestoppers, by calling 0800 555 111 or via its website.”
Reports can be made online at www.ThamesValley.Police.uk.