Mumbai: Sagar Defence Engineering (SDE) is in the early stages of evaluating a public listing and may be planning an initial public offering (IPO) of ₹2,000-3,000 crore, according to people familiar with the matter."The company is still at a very nascent stage for the IPO and it could take another 6-8 months to firm up plans and file the draft red herring prospectus (DRHP)," said a person familiar with the development. Overall, the process could take close to a year."The proposed issue is likely to be a combination of a fresh issue and an offer for sale. The company has appointed DAM Capital Advisors as the book-running lead manager for the issue.Emails sent to the company and the investment banker did not elicit a response.The Mumbai-headquartered company designs, develops and manufactures autonomous and unmanned systems across maritime, aerial and underwater domains. Its product portfolio includes unmanned marine surface vehicles, maritime spotter drones and personal aerial vehicles.