Mirum Pharmaceuticals (MIRM) 8-K Mirum Pharmaceuticals Announces Proposed Convertible Senior Notes Offering

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): April 12, 2023

Mirum Pharmaceuticals, Inc.

(Exact name of Registrant as Specified in Its Charter)

Delaware	001-38981	83-1281555
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(IRS Employer Identification No.)

950 Tower Lane
Suite 1050
Foster City, California	94404
(Address of Principal Executive Offices)	(Zip Code)

Registrant’s Telephone Number, Including Area Code: 650 667-4085

N/A

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common stock, par value $0.0001 per share	MIRM	Nasdaq Global Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company  ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  ☒

Item 1.01. Entry Into a Material Definitive Agreement.

On April 17, 2023, Mirum Pharmaceuticals, Inc. (the “Company”) issued $316.25 million principal amount of its 4.00% Convertible Senior Notes due 2029 (the “Notes”). The Notes were issued pursuant to, and are governed by, an indenture (the “Indenture”), dated as of April 17, 2023, between the Company and U.S. Bank Trust Company, National Association, as trustee (the “Trustee”). Pursuant to the purchase agreement among the Company and the initial purchasers of the Notes (the “Purchase Agreement”), the Company granted the initial purchasers an option to purchase, for settlement within a period of 13 days from, and including, the date the Notes are first issued, up to an additional $41.25 million principal amount of Notes. The Notes issued on April 17, 2023 include $41.25 million principal amount of Notes issued pursuant to the full exercise by the initial purchasers of such option.

The Notes are the Company’s senior, unsecured obligations and are (i) senior in right of payment to any of the Company’s indebtedness that is expressly subordinated to the Notes in right of payment; (ii) equal in right of payment to any of the Company’s indebtedness that is not so subordinated; (iii) effectively subordinated to any of the Company’s secured indebtedness, to the extent of the value of the collateral securing that indebtedness; and (iv) structurally subordinated to all indebtedness and other liabilities, including trade payables, and (to the extent the Company is not a holder thereof) preferred equity, if any, of the Company’s subsidiaries.

The Notes will accrue interest at a rate of 4.00% per annum, payable semi-annually in arrears on May 1 and November 1 of each year, beginning on November 1, 2023. The Notes will mature on May 1, 2029, unless earlier converted, redeemed or repurchased by the Company. Before January 2, 2029, noteholders will have the right to convert their Notes only in the following circumstances: (i) during any calendar quarter (and only during such calendar quarter) commencing after the calendar quarter ending on June 30, 2023, if the last reported sale price per share of the Company’s common stock, $0.0001 par value per share (the “common stock”), exceeds 130% of the conversion price for each of at least 20 trading days, whether or not consecutive, during the 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter; (ii) during the five consecutive business days immediately after any 10 consecutive trading day period (such 10 consecutive trading day period, the “measurement period”) if the trading price per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of the common stock on such trading day and the conversion rate on such trading day; (iii) upon the occurrence of certain corporate events or distributions on the common stock, as described in the Indenture; (iv) if the Company calls such Notes for redemption; and (v) at any time from, and including, January 2, 2029 until the close of business on the scheduled trading day immediately before the maturity date. The Company will settle conversions by paying or delivering, as applicable, cash, shares of its common stock or a combination of cash and shares of its common stock, at the Company’s election. The initial conversion rate is 31.5075 shares of common stock per $1,000 principal amount of Notes, which represents an initial conversion price of approximately $31.74 per share of common stock. The conversion rate and conversion price will be subject to customary adjustments upon the occurrence of certain events. In addition, if certain corporate events that constitute a “Make-Whole Fundamental Change” (as defined in the Indenture) occur, then the conversion rate will, in certain circumstances, be increased for a specified period of time.

The Company may not redeem the Notes at its option at any time before May 5, 2026. The Notes will be redeemable, in whole or in part (subject to the partial redemption limitation described below), at the Company’s option at any time, and from time to time, on or after May 5, 2026 and, in the case of a partial redemption, on or before the 50th scheduled trading day immediately before the maturity date, at a cash redemption price equal to the principal amount of the Notes to be redeemed, plus accrued and unpaid interest, if any, to, but excluding, the redemption date, but only if the last reported sale price per share of the common stock exceeds 130% of the conversion price on (i) each of at least 20 trading days, whether or not consecutive, during the 30 consecutive trading days ending on, and including, the trading day immediately before the date the Company sends the related redemption notice; and (ii) the trading day immediately before the date the Company sends such notice. In addition, calling any Note for redemption will constitute a Make-Whole Fundamental Change with respect to that Note, in which case the conversion rate applicable to the conversion of that Note will be increased in certain circumstances if it is converted after it is called for redemption. Pursuant to the partial redemption limitation, the Company may not elect to redeem less than all of the outstanding Notes unless at least $75.0 million aggregate principal amount of Notes are outstanding and not called for redemption as of the time the Company sends the related redemption notice.

If a “Fundamental Change” (as defined in the Indenture) occurs, then, subject to a limited exception for certain cash mergers, noteholders may require the Company to repurchase their Notes at a cash repurchase price equal to the principal amount of the Notes to be repurchased, plus accrued and unpaid interest, if any, to, but excluding, the fundamental change repurchase date. The definition of Fundamental Change includes certain business combination transactions involving the Company and certain de-listing events with respect to the common stock.

The Notes have customary provisions relating to the occurrence of “Events of Default” (as defined in the Indenture), which include the following: (i) certain payment defaults on the Notes (which, in the case of a default in the payment of interest on the Notes, will be subject to a 30-day cure period); (ii) the Company’s failure to send certain notices under the Indenture within specified periods of time; (iii) the Company’s failure to convert a Note in accordance with the Indenture upon exercise of the conversion right with respect

thereto; (iv) the Company’s failure to comply with certain covenants in the Indenture relating to the Company’s ability to consolidate with or merge with or into, or sell, lease or otherwise transfer, in one transaction or a series of transactions, all or substantially all of the assets of the Company and its subsidiaries, taken as a whole, to another person; (v) a default by the Company in its other obligations or agreements under the Indenture or the Notes if such default is not cured or waived within 60 days after notice is given in accordance with the Indenture; (vi) certain defaults by the Company or any of its significant subsidiaries with respect to indebtedness for borrowed money of at least $30,000,000; (vii) the rendering of certain judgments against the Company or any of its significant subsidiaries for the payment of at least $30,000,000, where such judgments are not discharged or stayed within 60 days after the date on which the right to appeal has expired or on which all rights to appeal have been extinguished; and (viii) certain events of bankruptcy, insolvency and reorganization involving the Company or any of its significant subsidiaries.

If an Event of Default involving bankruptcy, insolvency or reorganization events with respect to the Company (and not solely with respect to a significant subsidiary of the Company) occurs, then the principal amount of, and all accrued and unpaid interest on, all of the Notes then outstanding will immediately become due and payable without any further action or notice by any person. If any other Event of Default occurs and is continuing, then, the Trustee, by notice to the Company, or noteholders of at least 25% of the aggregate principal amount of Notes then outstanding, by notice to the Company and the Trustee, may declare the principal amount of, and all accrued and unpaid interest on, all of the Notes then outstanding to become due and payable immediately. However, notwithstanding the foregoing, the Company may elect, at its option, that the sole remedy for an Event of Default relating to certain failures by the Company to comply with certain reporting covenants in the Indenture consists exclusively of the right of the noteholders to receive special interest on the Notes for up to 365 days at a specified rate per annum not exceeding 0.50% on the principal amount of the Notes.

The Company used a portion of the net proceeds from this offering to (i) repurchase the revenue interests from the RIPA Purchasers (as defined below) at a call price of approximately $192.7 million and (ii) satisfy all other obligations outstanding under the Revenue Interest Purchase Agreement (the “RIPA”), dated as of December 8, 2020, as amended in September 2021, by and among Mirum and Mulholland SA LLC, an affiliate of Oberland Capital Management LLC, as agent for the purchasers party thereto (the “RIPA Purchasers”), and the RIPA Purchasers, and the other Transaction Documents (as defined in the RIPA) (collectively, the “Repurchase”).

The Company expects to use the remaining net proceeds from this offering for general corporate purposes, including working capital, operating expenses and capital expenditures. The Company may also use a portion of the net proceeds, together with existing cash, cash equivalents, restricted cash equivalents and short-term investments, to acquire complementary businesses, services or technologies. However, the Company does not have agreements or commitments to enter into any acquisitions at this time. These expectations are subject to change. The Company will have broad discretion over how to use the net proceeds from this offering. The Company intends to invest the net proceeds from the offering that are not used as described above in short-term, investment-grade, interest-bearing instruments.

The above description of the Indenture and the Notes is a summary and is not complete. A copy of the Indenture and the form of the certificate representing the Notes are filed as Exhibits 4.1 and 4.2, respectively, to this Current Report on Form 8-K, and the above summary is qualified by reference to the terms of the Indenture and the Notes set forth in such Exhibits.

Item 1.02. Termination of a Material Definitive Agreement.

On April 17, 2023, upon the Repurchase as further described in Item 1.01 above, the RIPA terminated in accordance with its terms.

Item 2.03. Creation of a Direct Financial Obligation or an Off-Balance Sheet Arrangement.

The disclosure set forth in Item 1.01 above is incorporated by reference into this Item 2.03.

Item 3.02. Unregistered Sales of Equity Securities.

The disclosure set forth in Item 1.01 above is incorporated by reference into this Item 3.02. The Notes were issued to the initial purchasers in reliance upon Section 4(a)(2) of the Securities Act of 1933, as amended (the “Securities Act”), in transactions not involving any public offering. The Notes were resold by the initial purchasers to persons whom the initial purchasers reasonably believe are “qualified institutional buyers,” as defined in, and in accordance with, Rule 144A under the Securities Act. The Company relied on these exemptions from registration based in part on representations made by the initial purchasers in the Purchase Agreement dated April 12, 2023 by and among the Company and the initial purchasers. The Notes and the shares of common stock issuable upon conversion of the Notes, if any, have not been registered under the Securities Act and may not be offered or sold in the United States absent registration or an applicable exemption from registration requirements. Any shares of the common stock that may be issued upon conversion of the Notes will be issued in reliance upon Section 3(a)(9) of the Securities Act as involving an exchange by the Company exclusively with its security holders. Initially, a maximum of 13,451,693 shares of the common stock may be issued upon conversion of the Notes, based on the initial maximum conversion rate of 42.5350 shares of common stock per $1,000 principal amount of Notes, which is subject to customary anti-dilution adjustment provisions.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits.

Exhibit No.	Description
4.1	Indenture, dated as of April 17, 2023, between Mirum Pharmaceuticals, Inc. and U.S. Bank Trust Company, National Association, as trustee.
4.2	Form of certificate representing the 4.00% Convertible Senior Notes due 2029 (included as Exhibit A to Exhibit 4.1).
99.1	Press release of Mirum Pharmaceuticals, Inc., dated April 12, 2023.
99.2	Press release of Mirum Pharmaceuticals, Inc., dated April 12, 2023.
104	Cover page interactive data file (embedded within the inline XBRL document).

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	Mirum Pharmaceuticals, Inc.
Date: April 17, 2023	By:	/s/ Christopher Peetz
		Christopher Peetz
		President and Chief Executive Officer