Filed Pursuant to Rule 424(b)(3)
Registration No. 333-298747
PROSPECTUS

Femasys Inc.
28,124,997 Shares
Common Stock
This prospectus relates to the offer and resale from time to time by the selling stockholders named in this prospectus of up to an aggregate of 28,124,997 shares of our common stock, par value $0.001 per share. These shares consist of (i) 5,013,559 shares of our common stock, (ii) 4,361,440 shares of our common stock issuable upon the exercise of pre-funded warrants (“Pre-Funded Warrants”), (iii) 9,374,999 shares of common stock issuable upon the exercise of common stock warrants (“Common Warrants”) and (iv) 9,374,999 shares of our common stock issuable upon the exercise of milestone warrants (“Milestone Warrants” and, collectively with the Pre-Funded Warrants and the Common Warrants, the “Warrants”), in each case, that were initially issued pursuant to that certain securities purchase agreement with certain accredited investors as part of a private placement completed on August 10, 2026.
Our registration of the securities covered by this prospectus does not mean that the selling stockholders will offer or sell any of the shares of common stock. The selling stockholders may sell or otherwise dispose of the shares of common stock publicly or through private transactions at prevailing market prices or at negotiated prices. We provide more information about how the selling stockholders may sell their shares in the section entitled “Plan of Distribution.”
We will not receive any proceeds from the sale of shares of common stock by the selling stockholders. We will, however, receive the proceeds from any exercise of the warrants for cash.
Our common stock is listed on the Nasdaq Capital Market (“Nasdaq”) under the symbol “FEMY.” On September 1, 2026, the last reported per share price of our common stock on the Nasdaq was $3.26 per share.
Investing in our common stock involves a high degree of risk. Before deciding whether to invest in our securities, you should consider carefully the risks that we have described under the caption “Risk Factors” in the documents incorporated by reference into this prospectus.
Neither the Securities and Exchange Commission nor any state securities commission has approved or disapproved of these securities or determined if this prospectus is truthful or complete. Any representation to the contrary is a criminal offense.
The date of this prospectus is September 28, 2026.