Filed Pursuant to Rule 424(b)(3)
Registration No. 333-259731
PROSPECTUS SUPPLEMENT NO. 10
(To the Prospectus dated
May 19, 2022)
Up to 64,020,756 Shares of Common Stock
Up to 13,824,992 Shares of Common Stock Issuable Upon Exercise of Warrants
Up to 5,200,000 Warrants to Purchase Common Stock
This prospectus
supplement supplements the prospectus, dated May 19, 2022 (the Prospectus), which forms a part of our registration statement on Form S-1 (No.
333-259731). This prospectus supplement is being filed to update and supplement the information in the Prospectus with certain information contained in our Current Report on Form
8-K filed with the Securities and Exchange Commission on November 18, 2022 (the Current Report). Accordingly, we have attached the Current Report to this prospectus supplement.
The Prospectus and this prospectus supplement relate to the issuance by us of an aggregate of up to 13,824,992 shares of our common stock,
$0.0001 par value per share (the common stock), which consists of (i) up to 5,200,000 shares of common stock that are issuable upon the exercise of 5,200,000 warrants (the Private Warrants) originally
issued in a private placement to LGL Systems Acquisition Holding Company, LLC (the Sponsor) in connection with the initial public offering of LGL Systems Acquisition Corp. (LGL) and (ii) up to 8,624,992
shares of common stock that are issuable upon the exercise of 8,624,992 warrants (the Public Warrants and, together with the Private Warrants, the Warrants) originally issued in the initial public offering of
LGL.
The Prospectus and this prospectus supplement also relate to the offer and sale from time to time by the selling securityholders
named in the Prospectus or their permitted transferees (the selling securityholders) of (i) up to 64,020,756 shares of common stock consisting of (a) up to 12,500,000 shares of common stock issued in a private placement
pursuant to subscription agreements (the Subscription Agreements) entered into on March 15, 2021, (b) up to 2,904,375 shares of common stock issued in a private placement to the Sponsor in connection with the initial public
offering of LGL (the Founder Shares), (c) up to 5,200,000 shares of common stock issuable upon exercise of the Private Warrants and (d) up to 43,416,381 shares of common stock (including up to 81,412 shares of common stock
issuable pursuant to outstanding options, 7,465,923 shares of common stock issuable in connection with the vesting and settlement of restricted stock units, and 560,703 shares of common stock that were issued as Earnout Shares on September 17,
2021) pursuant to that certain Amended and Restated Registration Rights Agreement, dated August 26, 2021, between us and the selling securityholders granting such holders registration rights with respect to such shares and (ii) up to
5,200,000 Private Warrants.
The common stock and Warrants are listed on the New York Stock Exchange (NYSE) under the
symbols IRNT and IRNT.WS, respectively. On November 18, 2022, the last reported sales price of our common stock on NYSE was $0.5834 per share and the last reported sales price of our Warrants was $0.0598 per warrant.
This prospectus supplement should be read in conjunction with the Prospectus, including any amendments or supplements thereto, which is
to be delivered with this prospectus supplement. This prospectus supplement is qualified by reference to the Prospectus, including any amendments or supplements thereto, except to the extent that the information in this prospectus supplement updates
and supersedes the information contained therein.
This prospectus supplement is not complete without, and may not be delivered or
utilized except in connection with, the Prospectus, including any amendments or supplements thereto.
We are an emerging growth
company as defined under U.S. federal securities laws and, as such, have elected to comply with reduced public company reporting requirements. The Prospectus complies with the requirements that apply to an issuer that is an emerging growth
company.
Investing in our securities involves a high degree of risk. You should review carefully the risks and uncertainties described
in the section titled Risk Factors beginning on page 8 of the Prospectus and under similar headings in any amendments or supplements to the Prospectus.
Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities, or
passed upon the accuracy or adequacy of this prospectus supplement or the Prospectus. Any representation to the contrary is a criminal offense.
Prospectus
Supplement dated November 21, 2022