Parker said BDP was valued at £4m but hoped to raise this to more than £5m through the offer.
He said: "This gives our staff a chance of gaining real ownership in a beneficial way. This is a long-term change but we've always included some form of profit-share." Parker said shares did not give staff voting rights – the firm's 24 directors would retain these.
The scheme was introduced by the Labour government to encourage wider ownership of UK industry.