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Published on 4/13/2023 in the Prospect News Convertibles Daily.

New Issue: Mirum Pharmaceuticals prices upsized $275 million 4% six-year convertibles, up 35%

By Abigail W. Adams

Portland, Me., April 13 – Mirum Pharmaceuticals Inc. priced an upsized $275 of six-year convertible notes after the market close on Wednesday at par with a coupon of 4% and an initial conversion premium of 35%, according to a company news release and a market source.

Pricing came in line with talk for a fixed coupon of 4% and richer than talk for a fixed conversion premium of 32.5%.

J.P. Morgan Securities LLC (lead left) and Evercore ISI were bookrunners for the Rule 144A offering, which carries an upsized greenshoe of $41.25 million.

The initial size of the offering was $200 million with a greenshoe of $30 million.

The notes are non-callable until May 5, 2026 and then are redeemable for cash subject to a 130% hurdle.

They are putable upon a fundamental change.

The notes will be settled in cash, shares, or a combination of both at the company’s option.

Net proceeds are expected to be $265.5 million or will be $305.4 million if the greenshoe is exercised in full.

Proceeds will be used to repurchase the revenue interests under the Revenue Interest Purchase Agreement with an affiliate of Oberland Capital Management LLC at a call price of $192.7 million and for general corporate purposes.

Mirum Pharmaceuticals is a Foster City, Calif.-based biopharmaceutical company.

Issuer:Mirum Pharmaceuticals Inc.
Amount:$275 million
Greenshoe:$41.25 million
Issue:Convertible senior notes
Maturity:May 1, 2029
Bookrunners:J.P. Morgan Securities LLC and Evercore ISI
Coupon:4%
Price:Par
Yield:4%
Conversion premium:35%
Conversion price:$31.74
Conversion rate:31.5075
Call options:Non-callable until May 5, 2026 and then redeemable for cash subject to a 130% hurdle
Put options:Upon a fundamental change
Pricing date:April 12
Settlement date:April 17
Distribution:Rule 144A
Talk:Fixed coupon of 4% and fixed conversion premium of 32.5%
Stock symbol:Nasdaq: MIRM
Stock price:$23.51 at market close April 12
Market capitalization:$892.23 million

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