Common Stock

3 Months Ended

Mar. 31, 2024

Common Stock.

Common Stock

10. Common Stock

As of March 31, 2024, an aggregate of 15,285,096 shares of common stock was reserved for future issuance under the Company’s stock plans, including outstanding stock options, restricted stock units, and performance stock units that have been issued totaling 8,804,692 and 1,294,531 shares available for future grants under the Company’s 2017 Equity Employee Stock Purchase Plan.

On November 2, 2021, the Company entered into a Sales Agreement with Cowen and Company, LLC (“Cowen”), pursuant to which the Company may issue and sell shares of its common stock, having an aggregate offering price of up to $100.0 million, from time to time through an “at the market” equity offering program under which Cowen acts as sales agent (the “ATM Program”). Between August 10, 2023 and August 21, 2023, the Company sold approximately two million shares of its common stock in the ATM Program for net proceeds of approximately $48.9 million. The Company intends to use the net proceeds from the ATM Program to support its global commercialization efforts for IMCIVREE® (setmelanotide) and clinical development programs in hypothalamic obesity and other rare MC4R pathway diseases.

On February 29, 2024, the Company and Cowen entered into Amendment No. 1 to Sales Agreement (the “Amendment”) to increase the aggregate offering price of the shares of Common Stock that may be issued and sold pursuant to the Sales Agreement to $200,000,000 (excluding the aggregate offering price of shares of Common Stock

issued and sold pursuant to the Sales Agreement prior to February 29, 2024). In connection with the Amendment, on February 29, 2024, the Company filed with the SEC a prospectus supplement, dated February 29, 2024, which, combined with the Base Prospectus (together, the “New Prospectus”), amended the Prior Prospectus in its entirety. The issuances and sales under the Sales Agreement, as amended by the Amendment, will be made pursuant to the Registration Statement and the New Prospectus.

On February 9, 2022, the Company’s board of directors adopted the Rhythm Pharmaceuticals, Inc. 2022 Employment Inducement Plan or the Inducement Plan, without stockholder approval pursuant to Rule 5635(c)(4) of the Nasdaq Stock Market LLC listing rules or Rule 5635(c)(4). In accordance with Rule 5635(c)(4), awards under the Inducement Plan may only be made to a newly hired employee who has not previously been a member of the Company’s board of directors, or an employee who is being rehired following a bona fide period of non-employment by the Company or a subsidiary, as a material inducement to the employee’s entering into employment with the Company or its subsidiary. An aggregate of 1,000,000 shares of the Company’s common stock have been reserved for issuance under the Inducement Plan. The Company will continue to grant awards under the 2017 Plan pursuant to the terms thereof.

The exercise price of stock options granted under the Inducement Plan will not be less than the fair market value of a share of the Company’s common stock on the grant date. Other terms of awards, including vesting requirements, are determined by the Company’s board of directors and are subject to the provisions of the Inducement Plan. Stock options granted to employees generally vest over a four-year period but may be granted with different vesting terms. Certain options may provide for accelerated vesting in the event of a change in control. Stock options granted under the Inducement Plan expire no more than 10 years from the date of grant. As of the three months ended March 31, 2024, 553,889 stock option awards have been issued under the Inducement Plan. As of March 31, 2024, 281,196 restricted stock unit awards have been granted under the Inducement Plan. As of March 31, 2024, 164,915 shares of common stock are available for future grant under the Inducement Plan.

On January 4, 2024, the Company issued 432,143 shares of common stock as partial consideration for its acquisition of the worldwide rights to LGC’s proprietary compound LB54640.