Canberra-based cyber security firm archTIS has launched a cash call, two weeks after buying data security business Nucleus Cyber.

The $69 million company was looking for $7 million in fresh equity on Tuesday morning via a placement of new shares, in a raising being handled by MST Financial and amicaa Advisors.

The offer was priced at 33¢ a share, which represented a 15.4 per cent discount to archTIS' last close and a 19.7 per cent discount to the 30-day VWAP, according to terms sent to funds.

Money raised would go towards sales and marketing and commercialising one of archTIS' products.

It would also be used to finance some obligations associated with archTIS' purchase of Nucleus Cyber last week, for a $6.25 million initial scrip consideration and $3.5 million deferred scrip consideration.

Bids into the placement were due by 10am on Wednesday, potential investors were told.