Omnitech Engineering, which aims to raise ₹583 crore via initial public offering, saw a muted demand from investors on its final bidding day. Till 12:30 pm, the IPO was subscribed 21% on its final bidding day on Friday, as per BSE data. The Qualified Institutional Buyers (QIBs) category fetched 14% subscription, while Retail Individual Investors (RIIs) portion got subscribed 21%.