Primary Offering Of
26,392,355 Shares of Common Stock
Secondary Offering of
23,210,601 Shares of Common Stock
4,340,278 Warrants to Purchase Common Stock
and
10,152,865 Shares of Common Stock
This prospectus supplement amends and supplements (i) the prospectus dated April 19, 2022 (as supplemented or amended from time to time, the “April 19 Prospectus”), which forms a part of our Registration
Statement on Form S-1 (No. 333-253114) and (ii) the prospectus dated April 28, 2022 (as supplemented or amended from time to time, the “April 28 Prospectus” and together with the April 19 Prospectus, the “Prospectuses” and each, a
“Prospectus”), which forms a part of our Registration Statement on Form S-1 (No. 333-264421). This prospectus supplement is being filed to update and supplement the information in the Prospectuses with the information contained in our Current
Reports on Form 8-K as filed with the Securities and Exchange Commission on June 3, 2022, June 14, 2022, June 16, 2022 and June 17, 2022 (each of which is attached to and a part of this prospectus supplement), only to the extent that any
information contained in those documents is deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.
The April 19 Prospectus and this prospectus supplement relate to the issuance by us of up to an aggregate of (i) 22,029,279 shares of our common stock that may be issued upon exercise of warrants to purchase
common stock at an exercise price of $11.50 per share (the “public warrants”) issued by AMCI Acquisition Corp. (“AMCI”) in its initial public offering; (ii) 3,940,278 shares of our common stock that may be issued upon exercise of placement
warrants at an exercise price of $11.50 per share that were originally sold to AMCI Sponsor LLC (the “Sponsor”) in a private placement consummated simultaneously with AMCI’s IPO (the “placement warrants”); and (iii) up to an aggregate of
400,000 shares of our common stock that may be issued upon the exercise of the working capital warrants at an exercise price of $11.50 per share that were issued to the Sponsor in connection with loans made by it to AMCI prior to the closing of
the Business Combination, (the “working capital warrants” and, together with the placement warrants and the public warrants, the “warrants”).
The April 19 Prospectus and this prospectus supplement also relate to the offer and sale, from time to time, by the selling securityholders named in the April 19 Prospectus or any of their permitted transferees,
of (i) up to an aggregate of 6,500,000 shares of our common stock that were issued to certain investors in a private placement in connection with the closing of the Business Combination; (ii) up to an aggregate of 12,370,323 shares of our
common stock otherwise held by the selling securityholders; (iii) up to an aggregate of 3,940,278 shares of our common stock that may be issued upon exercise of the placement warrants held by the selling securityholders; (iv) up to an aggregate
of 400,000 shares of our common stock that may be issued upon the exercise of the working capital warrants held by the selling securityholders and (v) up to an aggregate of 3,940,278 placement warrants and 400,000 working capital warrants held
by the selling securityholders, as further described in the April 19 Prospectus. The April 19 Prospectus and this prospectus supplement also cover any additional securities that may become issuable by reason of share splits, share dividends or
other similar transactions.
The April 28 Prospectus relates to the offer and sale, from time to time, by the selling securityholders named in the April 28 Prospectus or any of their permitted transferees of up to an aggregate of 10,152,865
shares of our common stock, consisting of (i) 5,124,846 shares issued to F.E.R. fischer Edelstahlrohre GmbH on August 31, 2021 pursuant to the Share Purchase Agreement, dated as of June 25, 2021, and (ii) 5,028,019 shares held by other selling
securityholders. The April 28 Prospectus and this prospectus supplement also covers any additional securities that may become issuable by reason of share splits, share dividends or other similar transactions.
Our common stock and warrants are listed on Nasdaq under the symbols “ADN” and “ADNWW”, respectively. On June 17, 2022, the closing price of our common stock was $2.89 per share and the closing price of our
warrants was $0.5315 per share.
This prospectus supplement updates and supplements the information in the Prospectus and is not complete without, and may not be delivered or utilized except in combination with, the Prospectus, including any
amendments or supplements thereto. This prospectus supplement should be read in conjunction with the Prospectus and if there is any inconsistency between the information in the Prospectus and this prospectus supplement, you should rely on the
information in this prospectus supplement.
Investing in our securities involves risks that are described in the “Risk Factors” section beginning on page 13 of the Prospectus.
Neither the SEC nor any state securities commission has approved or disapproved of the securities to be issued under the Prospectus or determined if the Prospectus or this prospectus supplement
is truthful or complete. Any representation to the contrary is a criminal offense.