# EDGAR Filing Document

**Accession Number:** 0001595725
**File Stem:** 0001172661-23-001259
**Filing Date:** 2023-2
**Character Count:** 21879
**Document Hash:** f3053f9e6710422c0628a38d1d22e343
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001172661-23-001259.hdr.sgml**: 20230214

**ACCESSION NUMBER**: 0001172661-23-001259

**CONFORMED SUBMISSION TYPE**: SC 13G/A

**PUBLIC DOCUMENT COUNT**: 1

**FILED AS OF DATE**: 20230214

**DATE AS OF CHANGE**: 20230214

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Mirum Pharmaceuticals, Inc.
- **CENTRAL INDEX KEY:** 0001759425
- **STANDARD INDUSTRIAL CLASSIFICATION:** PHARMACEUTICAL PREPARATIONS [2834]
- **IRS NUMBER:** 831281555
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SC 13G/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-91075
- **FILM NUMBER:** 23627621

**BUSINESS ADDRESS:**
- **STREET 1:** 950 TOWER LANE, SUITE 1050
- **CITY:** FOSTER CITY
- **STATE:** CA
- **ZIP:** 94404
- **BUSINESS PHONE:** 650-667-4085

**MAIL ADDRESS:**
- **STREET 1:** 950 TOWER LANE, SUITE 1050
- **CITY:** FOSTER CITY
- **STATE:** CA
- **ZIP:** 94404
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Rock Springs Capital Management LP
- **CENTRAL INDEX KEY:** 0001595725
- **IRS NUMBER:** 800944416
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SC 13G/A

**BUSINESS ADDRESS:**
- **STREET 1:** 650 SOUTH EXETER STREET
- **STREET 2:** SUITE 1070
- **CITY:** BALTIMORE
- **STATE:** MD
- **ZIP:** 21202
- **BUSINESS PHONE:** 4102200129

**MAIL ADDRESS:**
- **STREET 1:** 650 SOUTH EXETER STREET
- **STREET 2:** SUITE 1070
- **CITY:** BALTIMORE
- **STATE:** MD
- **ZIP:** 21202

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**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION<br> Washington, DC 20549**

**SCHEDULE 13G/A**

<br> **Under the Securities Exchange Act of 1934**

**(Amendment No. 4)\***

**Mirum Pharmaceuticals, Inc.**

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| |
|:---|
| &nbsp;&nbsp;(Name of Issuer) |
| &nbsp;&nbsp; <br> **Common Stock, par value $0.0001 per share** |
| &nbsp;&nbsp;(Title of Class of Securities) |
| &nbsp;&nbsp; <br> **604749101** |
| &nbsp;&nbsp;(CUSIP Number) |
| &nbsp;&nbsp;**December 31, 2022** |
| &nbsp;&nbsp;(Date of Event Which Requires Filing of this Statement) |

---

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

□ Rule 13d-1(b)

⌧ Rule 13d-1(c)

□ Rule 13d-1(d)

\*The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).

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| | | |
|:---|:---|:---|
| **CUSIP No. 604749101** | **SCHEDULE 13G/A** | &nbsp;&nbsp;&nbsp; **Page 2 of 9 Pages** |

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| | | | | |
|:---|:---|:---|:---|:---|
| 1 | NAME OF REPORTING PERSONS<br>Rock Springs Capital Management LP | NAME OF REPORTING PERSONS<br>Rock Springs Capital Management LP | NAME OF REPORTING PERSONS<br>Rock Springs Capital Management LP | NAME OF REPORTING PERSONS<br>Rock Springs Capital Management LP |
| 2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP <br> (a) □<br> (b) □ | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP <br> (a) □<br> (b) □ | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP <br> (a) □<br> (b) □ |  |
| 3 | SEC USE ONLY | SEC USE ONLY | SEC USE ONLY | SEC USE ONLY |
| 4 | CITIZENSHIP OR PLACE OF ORGANIZATION<br>Delaware | CITIZENSHIP OR PLACE OF ORGANIZATION<br>Delaware | CITIZENSHIP OR PLACE OF ORGANIZATION<br>Delaware | CITIZENSHIP OR PLACE OF ORGANIZATION<br>Delaware |
| NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5 | SOLE VOTING POWER<br>0 | SOLE VOTING POWER<br>0 |
| NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6 | SHARED VOTING POWER<br>1,795,733 | SHARED VOTING POWER<br>1,795,733 |
| NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7 | SOLE DISPOSITIVE POWER<br>0 | SOLE DISPOSITIVE POWER<br>0 |
| NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8 | SHARED DISPOSITIVE POWER<br>1,795,733 | SHARED DISPOSITIVE POWER<br>1,795,733 |
| 9 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON<br>1,795,733 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON<br>1,795,733 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON<br>1,795,733 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON<br>1,795,733 |
| 10 | CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES | CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES | CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES | o |
| 11 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)<br>4.87% | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)<br>4.87% | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)<br>4.87% | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)<br>4.87% |
| 12 | TYPE OF REPORTING PERSON <br>IA | TYPE OF REPORTING PERSON <br>IA | TYPE OF REPORTING PERSON <br>IA | TYPE OF REPORTING PERSON <br>IA |

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| | | |
|:---|:---|:---|
| **CUSIP No. 604749101** | **SCHEDULE 13G/A** | &nbsp;&nbsp;&nbsp; **Page 3 of 9 Pages** |

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| | | | | |
|:---|:---|:---|:---|:---|
| 1 | NAME OF REPORTING PERSONS<br>Rock Springs Capital LLC | NAME OF REPORTING PERSONS<br>Rock Springs Capital LLC | NAME OF REPORTING PERSONS<br>Rock Springs Capital LLC | NAME OF REPORTING PERSONS<br>Rock Springs Capital LLC |
| 2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP <br> (a) □<br> (b) □ | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP <br> (a) □<br> (b) □ | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP <br> (a) □<br> (b) □ |  |
| 3 | SEC USE ONLY | SEC USE ONLY | SEC USE ONLY | SEC USE ONLY |
| 4 | CITIZENSHIP OR PLACE OF ORGANIZATION<br>Delaware | CITIZENSHIP OR PLACE OF ORGANIZATION<br>Delaware | CITIZENSHIP OR PLACE OF ORGANIZATION<br>Delaware | CITIZENSHIP OR PLACE OF ORGANIZATION<br>Delaware |
| NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5 | SOLE VOTING POWER<br>0 | SOLE VOTING POWER<br>0 |
| NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6 | SHARED VOTING POWER<br>1,795,733 | SHARED VOTING POWER<br>1,795,733 |
| NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7 | SOLE DISPOSITIVE POWER<br>0 | SOLE DISPOSITIVE POWER<br>0 |
| NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8 | SHARED DISPOSITIVE POWER<br>1,795,733 | SHARED DISPOSITIVE POWER<br>1,795,733 |
| 9 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON<br>1,795,733 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON<br>1,795,733 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON<br>1,795,733 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON<br>1,795,733 |
| 10 | CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES | CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES | CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES | o |
| 11 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)<br>4.87% | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)<br>4.87% | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)<br>4.87% | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)<br>4.87% |
| 12 | TYPE OF REPORTING PERSON <br>OO; HC | TYPE OF REPORTING PERSON <br>OO; HC | TYPE OF REPORTING PERSON <br>OO; HC | TYPE OF REPORTING PERSON <br>OO; HC |

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| | | |
|:---|:---|:---|
| **CUSIP No. 604749101** | **SCHEDULE 13G/A** | &nbsp;&nbsp;&nbsp; **Page 4 of 9 Pages** |

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| | | | | |
|:---|:---|:---|:---|:---|
| 1 | NAME OF REPORTING PERSONS<br>Rock Springs Capital Master Fund LP | NAME OF REPORTING PERSONS<br>Rock Springs Capital Master Fund LP | NAME OF REPORTING PERSONS<br>Rock Springs Capital Master Fund LP | NAME OF REPORTING PERSONS<br>Rock Springs Capital Master Fund LP |
| 2 | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP <br> (a) □<br> (b) □ | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP <br> (a) □<br> (b) □ | CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP <br> (a) □<br> (b) □ |  |
| 3 | SEC USE ONLY | SEC USE ONLY | SEC USE ONLY | SEC USE ONLY |
| 4 | CITIZENSHIP OR PLACE OF ORGANIZATION<br>Cayman Islands | CITIZENSHIP OR PLACE OF ORGANIZATION<br>Cayman Islands | CITIZENSHIP OR PLACE OF ORGANIZATION<br>Cayman Islands | CITIZENSHIP OR PLACE OF ORGANIZATION<br>Cayman Islands |
| NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 5 | SOLE VOTING POWER<br>0 | SOLE VOTING POWER<br>0 |
| NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 6 | SHARED VOTING POWER<br>1,600,000 | SHARED VOTING POWER<br>1,600,000 |
| NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 7 | SOLE DISPOSITIVE POWER<br>0 | SOLE DISPOSITIVE POWER<br>0 |
| NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | NUMBER OF<br> SHARES<br> BENEFICIALLY<br> OWNED BY<br> EACH<br> REPORTING<br> PERSON<br> WITH | 8 | SHARED DISPOSITIVE POWER<br>1,600,000 | SHARED DISPOSITIVE POWER<br>1,600,000 |
| 9 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON<br>1,600,000 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON<br>1,600,000 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON<br>1,600,000 | AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON<br>1,600,000 |
| 10 | CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES | CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES | CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES | o |
| 11 | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)<br>4.33% | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)<br>4.33% | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)<br>4.33% | PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9)<br>4.33% |
| 12 | TYPE OF REPORTING PERSON <br>PN | TYPE OF REPORTING PERSON <br>PN | TYPE OF REPORTING PERSON <br>PN | TYPE OF REPORTING PERSON <br>PN |

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| | | |
|:---|:---|:---|
| **CUSIP No. 604749101** | **SCHEDULE 13G/A** | &nbsp;&nbsp;&nbsp; **Page 5 of 9 Pages** |

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**Item 1.** **(a) Name of Issuer**

Mirum Pharmaceuticals, Inc. (the "Issuer")

**(b) Address of Issuer's Principal Executive Offices**

950 Tower Lane, Suite 1050

Foster City, CA 94404

**Item 2.** **(a) Name of Person Filing**

This Statement is filed on behalf of each of the following persons (collectively, the "Reporting Persons"):

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i. Rock Springs Capital Management LP ("RSCM");

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;ii. Rock Springs Capital LLC ("RSC"); and

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;iii. Rock Springs Capital Master Fund LP ("Master Fund").

This Statement relates to Shares (as defined herein) held directly by the Master Fund, which is a Cayman Islands exempted limited partnership, and Four Pines Master Fund LP ("Four Pines"), which is a Cayman Islands exempted limited partnership, and indirectly held by RSCM, a Delaware limited partnership, and RSC, a Delaware limited liability company. RSCM serves as the investment manager to the Master Fund. RSC is the general partner of RSCM.

**(b) Address of Principal Business Office, or, if none, Residence**

**Rock Springs Capital Management LP and Rock Springs Capital LLC**

650 South Exeter, Suite 1070

Baltimore, MD 21202

**Rock Springs Capital Master Fund LP**

c/o Walkers Corporate Limited

Cayman Corporate Centre

27 Hospital Road

George Town, Grand Cayman, KY1-9008, Cayman Islands

**(c) Citizenship**

Rock Springs Capital Management LP - Delaware

Rock Springs Capital LLC - Delaware

Rock Springs Capital Master Fund LP - Cayman Islands

**(d) Title of Class of Securities**

Common Stock, par value $0.0001 per share (the "Shares")

**(e) CUSIP No.:**

604749101

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| | | |
|:---|:---|:---|
| **CUSIP No. 604749101** | **SCHEDULE 13G/A** | &nbsp;&nbsp;&nbsp; **Page 6 of 9 Pages** |

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(a) ◻ Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);

(b) ◻ Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);

(c) ◻ Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);

(d) ◻ Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);

(e) □ An investment adviser in accordance with §240.13d-1(b)(1)(ii)(E);

(f) ◻ An employee benefit plan or endowment fund in accordance with §240.13d-1(b)(1)(ii)(F);

(g) ◻ A parent holding company or control person in accordance with §240.13d-1(b)(1)(ii)(G);

(h) ◻ A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(i) ◻ A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the
 Investment Company Act of 1940 (15 U.S.C. 80a-3);

(j) ◻ A non-U.S. institution in accordance with §240.13d-1(b)(1)(ii)(J);

(k) ◻ A group, in accordance with §240.13d-1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance with §240.13d-1(b)(1)(ii)(J),
 please specify the type of institution: <u> </u> 

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| | | |
|:---|:---|:---|
| **CUSIP No. 604749101** | **SCHEDULE 13G/A** | &nbsp;&nbsp;&nbsp; **Page 7 of 9 Pages** |

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**Item 4. Ownership**

Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1.

As of the date of this filing, each of RSC and RSCM may be deemed to be the beneficial owners of 1,795,733 Shares, which amount includes 1,600,000 Shares directly beneficially owned by the Master Fund, and 195,733 Shares directly beneficially owned by Four Pines. The percent of class is determined by dividing the number of Shares beneficially owned by the Reporting Persons by 36,870,380 Shares outstanding as reported in the Issuer's Form 10-Q filed on November 9, 2022.

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(a) Amount beneficially owned:**

Rock Springs Capital Management LP: 1,795,733

Rock Springs Capital LLC: 1,795,733

Rock Springs Capital Master Fund LP: 1,600,000

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(b) Percent of class:**

Rock Springs Capital Management LP: 4.87%

Rock Springs Capital LLC: 4.87%

Rock Springs Capital Master Fund LP: 4.33%

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(c) Number of shares as to which the person has:**

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(i) Sole power to vote or to direct the vote:**

Rock Springs Capital Management LP: 0

Rock Springs Capital LLC: 0

Rock Springs Capital Master Fund LP: 0

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(ii) Shared power to vote or to direct the vote:**

Rock Springs Capital Management LP: 1,795,733

Rock Springs Capital LLC: 1,795,733

Rock Springs Capital Master Fund LP: 1,600,000

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(iii) Sole power to dispose or to direct the disposition of:**

Rock Springs Capital Management LP: 0

Rock Springs Capital LLC: 0

Rock Springs Capital Master Fund LP: 0

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;**(iv) Shared power to dispose or to direct the disposition of:**

Rock Springs Capital Management LP: 1,795,733

Rock Springs Capital LLC: 1,795,733

Rock Springs Capital Master Fund LP: 1,600,000

**Item 5. Ownership of Five Percent or Less of a Class**

If this statement is being filed to report the fact that as of the date herof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following [X].

**Item 6. Ownership of More Than Five Percent on Behalf of Another Person**

Not Applicable.

**Item 7. Identification and Classification of the Subsidiary which Acquired the Security Being Reported on by the Parent Holding Company or Control Person**

Please see response to Item 2.

**Item 8. Identification and Classification of Members of the Group**

Not Applicable.

**Item 9. Notice of Dissolution of Group**

Not Applicable.

**Item 10. Certification**

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect.

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| | | |
|:---|:---|:---|
| **CUSIP No. 604749101** | **SCHEDULE 13G/A** | &nbsp;&nbsp;&nbsp; **Page 8 of 9 Pages** |

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**<u>SIGNATURE</u>**

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Date: February 14, 2023

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| | | |
|:---|:---|:---|
| Rock Springs Capital Management LP | Rock Springs Capital Management LP | Rock Springs Capital Management LP |
| By: | &nbsp;&nbsp;&nbsp;&nbsp;Graham McPhail | &nbsp;&nbsp;&nbsp;&nbsp;Graham McPhail |
|  | Name: | Graham McPhail |
|  | Title: | Member |

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| | | |
|:---|:---|:---|
| Rock Springs Capital LLC | Rock Springs Capital LLC | Rock Springs Capital LLC |
| By: | &nbsp;&nbsp;&nbsp;&nbsp;Graham McPhail | &nbsp;&nbsp;&nbsp;&nbsp;Graham McPhail |
|  | Name: | Graham McPhail |
|  | Title: | Member |

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| | | |
|:---|:---|:---|
| Rock Springs Capital Master Fund LP | Rock Springs Capital Master Fund LP | Rock Springs Capital Master Fund LP |
| By: | &nbsp;&nbsp;&nbsp;&nbsp;Graham McPhail | &nbsp;&nbsp;&nbsp;&nbsp;Graham McPhail |
|  | Name: | Graham McPhail |
|  | Title: | Member |

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| | | |
|:---|:---|:---|
| **CUSIP No. 604749101** | **SCHEDULE 13G/A** | &nbsp;&nbsp;&nbsp; **Page 9 of 9 Pages** |

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**<u>JOINT FILING AGREEMENT</u>**

The undersigned acknowledge and agree that the foregoing statement on Schedule 13G/A is filed on behalf of each of the undersigned and that all subsequent amendments to this statement on Schedule 13G/A shall be filed on behalf of each of the undersigned without the necessity of filing additional joint filing agreements. The undersigned acknowledge that each shall be responsible for the timely filing of such amendments, and for the completeness and accuracy of the information concerning him or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the others, except to the extent that he or it knows or has reason to believe that such information is inaccurate.

Date: February 14, 2023

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| | | |
|:---|:---|:---|
| Rock Springs Capital Management LP | Rock Springs Capital Management LP | Rock Springs Capital Management LP |
| By: | &nbsp;&nbsp;&nbsp;&nbsp;Graham McPhail | &nbsp;&nbsp;&nbsp;&nbsp;Graham McPhail |
|  | Name: | Graham McPhail |
|  | Title: | Member |

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| | | |
|:---|:---|:---|
| Rock Springs Capital LLC | Rock Springs Capital LLC | Rock Springs Capital LLC |
| By: | &nbsp;&nbsp;&nbsp;&nbsp;Graham McPhail | &nbsp;&nbsp;&nbsp;&nbsp;Graham McPhail |
|  | Name: | Graham McPhail |
|  | Title: | Member |

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| | | |
|:---|:---|:---|
| Rock Springs Capital Master Fund LP | Rock Springs Capital Master Fund LP | Rock Springs Capital Master Fund LP |
| By: | &nbsp;&nbsp;&nbsp;&nbsp;Graham McPhail | &nbsp;&nbsp;&nbsp;&nbsp;Graham McPhail |
|  | Name: | Graham McPhail |
|  | Title: | Member |

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