UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

 

 

SCHEDULE 13G

Under the Securities Exchange Act of 1934

(Amendment No.    )*

 

 

PROTEOSTASIS THERAPEUTICS, INC.

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

74373B109

(CUSIP Number)

November 17, 2020

(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, as amended (“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).

Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications:

Evan K. Hall, Esq.

Haynes and Boone, LLP

2323 Victory Avenue, Suite 700

Dallas, Texas 75219-7673

(214) 651-5000

 

 

 


SCHEDULE 13G

 

CUSIP No. 74373B109      

 

  1    

  Names of Reporting Persons

 

  Ikarian Capital, LLC

  2  

  Check the appropriate box if a member of a Group (see instructions)

  (a)  ☐        (b)  ☒

 

  3  

  Sec Use Only

 

  4  

Citizenship or Place of Organization

 

  Delaware

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With:

 

     5     

  Sole Voting Power

 

  0

     6   

  Shared Voting Power

 

  2,650,347

     7   

  Sole Dispositive Power

 

  0

     8   

  Shared Dispositive Power

 

  2,650,347

9    

  Aggregate Amount Beneficially Owned by Each Reporting Person

 

  2,650,347

10    

  Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

 

  ☐

11  

  Percent of class represented by amount in row (9)

 

  5.1% (1)

12  

  Type of Reporting Person (See Instructions)

 

  IA

 

(1)

Based upon 52,184,755 shares of Common Stock, par value $0.001 per share, outstanding as of November 12, 2020, as disclosed in the Issuer’s Form 10-Q filed on November 16, 2020, by the Issuer with the U.S. Securities and Exchange Commission.


SCHEDULE 13G

 

CUSIP No. 74373B109      

 

  1    

  Names of Reporting Persons

 

  Ikarian Healthcare Master Fund, L.P.

  2  

  Check the appropriate box if a member of a Group (see instructions)

  (a)  ☐        (b)  ☒

 

  3  

  Sec Use Only

 

  4  

Citizenship or Place of Organization

 

  Cayman Islands

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With:

 

     5     

  Sole Voting Power

 

  0

     6   

  Shared Voting Power

 

  2,111,874

     7   

  Sole Dispositive Power

 

  0

     8   

  Shared Dispositive Power

 

  2,111,874

9    

  Aggregate Amount Beneficially Owned by Each Reporting Person

 

  2,111,874

10    

  Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

 

  ☐

11  

  Percent of class represented by amount in row (9)

 

  4.0% (1)

12  

  Type of Reporting Person (See Instructions)

 

  PN

 

(1)

Based upon 52,184,755 shares of Common Stock, par value $0.001 per share, outstanding as of November 12, 2020, as disclosed in the Issuer’s Form 10-Q filed on November 16, 2020, by the Issuer with the U.S. Securities and Exchange Commission.


SCHEDULE 13G

 

CUSIP No. 74373B109      

 

  1    

  Names of Reporting Persons

 

  Ikarian Healthcare Fund GP, L.P.

  2  

  Check the appropriate box if a member of a Group (see instructions)

  (a)  ☐        (b)  ☒

 

  3  

  Sec Use Only

 

  4  

Citizenship or Place of Organization

 

  Delaware

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With:

 

     5     

  Sole Voting Power

 

  0

     6   

  Shared Voting Power

 

  2,111,874

     7   

  Sole Dispositive Power

 

  0

     8   

  Shared Dispositive Power

 

  2,111,874

9    

  Aggregate Amount Beneficially Owned by Each Reporting Person

 

  2,111,874

10    

  Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

 

  ☐

11  

  Percent of class represented by amount in row (9)

 

  4.0% (1)

12  

  Type of Reporting Person (See Instructions)

 

  PN

 

(1)

Based upon 52,184,755 shares of Common Stock, par value $0.001 per share, outstanding as of November 12, 2020, as disclosed in the Issuer’s Form 10-Q filed on November 16, 2020, by the Issuer with the U.S. Securities and Exchange Commission.


SCHEDULE 13G

 

CUSIP No. 74373B109      

 

  1    

  Names of Reporting Persons

 

  Chart Westcott

  2  

  Check the appropriate box if a member of a Group (see instructions)

  (a)  ☐        (b)  ☒

 

  3  

  Sec Use Only

 

  4  

Citizenship or Place of Organization

 

  United States

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With:

 

     5     

  Sole Voting Power

 

  0

     6   

  Shared Voting Power

 

  2,650,347

     7   

  Sole Dispositive Power

 

  0

     8   

  Shared Dispositive Power

 

  2,650,347

9    

  Aggregate Amount Beneficially Owned by Each Reporting Person

 

  2,650,347

10    

  Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

 

  ☐

11  

  Percent of class represented by amount in row (9)

 

  5.1% (1)

12  

  Type of Reporting Person (See Instructions)

 

  IN; HC

 

(1)

Based upon 52,184,755 shares of Common Stock, par value $0.001 per share, outstanding as of November 12, 2020, as disclosed in the Issuer’s Form 10-Q filed on November 16, 2020, by the Issuer with the U.S. Securities and Exchange Commission.


SCHEDULE 13G

 

CUSIP No. 74373B109      

 

  1    

  Names of Reporting Persons

 

  Neil Shahrestani

  2  

  Check the appropriate box if a member of a Group (see instructions)

  (a)  ☐        (b)  ☒

 

  3  

  Sec Use Only

 

  4  

Citizenship or Place of Organization

 

  United States of America

Number of

Shares

Beneficially

Owned by

Each

Reporting

Person

With:

 

     5     

  Sole Voting Power

 

  0

     6   

  Shared Voting Power

 

  2,650,347

     7   

  Sole Dispositive Power

 

  0

     8   

  Shared Dispositive Power

 

  2,650,347

9    

  Aggregate Amount Beneficially Owned by Each Reporting Person

 

  2,650,347

10    

  Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

 

  ☐

11  

  Percent of class represented by amount in row (9)

 

  5.1% (1)

12  

  Type of Reporting Person (See Instructions)

 

  IN; HC

 

(1)

Based upon 52,184,755 shares of Common Stock, par value $0.001 per share, outstanding as of November 12, 2020, as disclosed in the Issuer’s Form 10-Q filed on November 16, 2020, by the Issuer with the U.S. Securities and Exchange Commission.


Item 1.

 

  (a)

Name of Issuer:

Proteostasis Therapeutics, Inc.

 

  (b)

Address of Issuer’s Principal Executive Offices:

80 Guest Street, Suite 500, Boston, Massachusetts 02135

 

Item 2.

 

(a)

Name of Person Filing:

This statement is jointly filed by and on behalf of each of Ikarian Capital, LLC, a Delaware limited liability company (“Ikarian Capital”), Ikarian Healthcare Master Fund, L.P, a Cayman Islands exempted limited partnership (the “Fund”), Ikarian Healthcare Fund GP, L.P., a Delaware limited partnership (“Ikarian GP”), Chart Westcott and Neil Shahrestani (collectively referred herein as the “Reporting Persons”). Ikarian Capital is the investment manager of, and may be deemed to indirectly beneficially own securities owned by, the Fund. Ikarian GP is the general partner of, and may be deemed to indirectly beneficially own securities owned by, the Fund. Ikarian Capital is also the general partner of, and may be deemed to indirectly beneficially own, securities beneficially owned by Ikarian GP. Ikarian Capital is a sub-advisor for certain separate managed accounts (collectively, the “Managed Accounts”) and may be deemed to indirectly beneficially own securities owned by the Managed Accounts. Ikarian Capital is ultimately owned and controlled by Chart Westcott Living Trust, of which Mr. Westcott serves as the sole trustee (the “Trust”), and indirectly by Mr. Shahrestani. Accordingly, each of Mr. Westcott, as sole trustee of the Trust, and Mr. Shahrestani may be deemed to indirectly beneficially own securities beneficially owned by, Ikarian Capital. The Fund and the Managed Accounts are the record and direct beneficial owners of the securities covered by this statement. The Fund disclaims beneficial ownership of the shares held by the Managed Accounts.

Each Reporting Person declares that neither the filing of this statement nor anything herein shall be construed as an admission that such person is, for the purposes of Section 13(d) or 13(g) of the Act or any other purpose, the beneficial owner of any securities covered by this statement.

Each Reporting Person may be deemed to be a member of a group with respect to the issuer or securities of the issuer for the purpose of Section 13(d) or 13(g) of the Act. Each of the Reporting Persons declares that neither the filing of this statement nor anything herein shall be construed as an admission that such person is, for the purpose of Section 13(d) or 13(g) of the Act or any other purpose, (i) acting (or has agreed or is agreeing to act together with any other person) as a partnership, limited partnership, syndicate, or other group for the purpose of acquiring, holding, or disposing of securities of the issuer or otherwise with respect to the issuer or any securities of the issuer or (ii) a member of any group with respect to the issuer or any securities of the issuer.

 

(b)

Address of Principal Business Office or, if None, Residence:

The address of the principal business office of each of the Reporting Persons is c/o Ikarian Capital, LLC, 100 Crescent Court, Suite 1620, Dallas, Texas 75201.

 

(c)

Citizenship:

See Item 4 on the cover page(s) hereto.


(d)

Title and Class of Securities:

Common Stock, par value $0.001 per share

 

(e)

CUSIP No.:

74373B109

 

Item 3.

If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:

 

  (a)

[_] Broker or dealer registered under Section 15 of the Act;

 

  (b)

[_] Bank as defined in Section 3(a)(6) of the Act;

 

  (c)

[_] Insurance company as defined in Section 3(a)(19) of the Act;

 

  (d)

[_] Investment company registered under Section 8 of the Investment Company Act of 1940;

 

  (e)

[_] An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E);

 

  (f)

[_] An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F);

 

  (g)

[_] A parent holding company or control person in accordance with Rule 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;

 

  (j)

[_] A non-U.S. institution in accordance with Rule 240.13d-1(b)(1)(ii)(J);

 

  (k)       [_]

Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance with Rule 240.13d-1(b)(1)(ii)(J), please specify the type of institution: ____

 

Item 4.

Ownership

 

(a)

Amount Beneficially Owned as of the time of filing: See Item 9 on the cover pages(s) hereto.

 

(b)

Percent of Class as of the time of filing: See Item 11 on the cover page(s) hereto.

 

(c)

As of the time of filing, number of shares as to which such person has:

 

  (i)

Sole power to vote or to direct the vote: See Item 5 on the cover pages hereto.

 

  (ii)

Shared power to vote or to direct the vote: See Item 6 on the cover pages hereto.

 

  (iii)

Sole power to dispose or to direct the disposition of: See Item 7 on the cover pages hereto.

 

  (iv)

Shared power to dispose or to direct the disposition of: See Item 8 on the cover pages hereto.


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 hereof the Reporting Persons have ceased to be the beneficial owners of more than five percent of the class of securities, check the following [ ].

 

Item 6.

Ownership of more than Five Percent on Behalf of Another Person.

The information set forth in Item 2(a) is incorporated by reference herein.

 

Item 7.

Identification and classification of the subsidiary which acquired the security being reported on by the parent holding company or control person.

Not applicable.

 

Item 8.

Identification and classification of members of the group.

Not applicable.

 

Item 9.

Notice of Dissolution of Group.

Not applicable.

 

Item 10.

Certifications.

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 other than activities solely in connection with a nomination under § 240.14a-11.


SIGNATURE

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.

Dated: November 17, 2020

 

IKARIAN CAPITAL, LLC
By:       Chart Westcott Living Trust
Its:   Manager
By:   /s/ Chart Westcott
  Chart Westcott, Trustee
IKARIAN HEALTHCARE MASTER FUND, L.P.
By:   Ikarian Healthcare Fund GP, L.P.
Its:   General Partner
By:   Ikarian Capital, LLC
Its:   General Partner
By:   Chart Westcott Living Trust
Its:   Manager
By:   /s/ Chart Westcott
  Chart Westcott, Trustee
IKARIAN HEALTHCARE FUND GP, L.P.
By:   Ikarian Capital, LLC
Its:   General Partner
By:   Chart Westcott Living Trust
Its:   Manager
By:   /s/ Chart Westcott
  Chart Westcott, Trustee
CHART WESTCOTT LIVING TRUST
By:   /s/ Chart Westcott
  Chart Westcott, Trustee
NEIL SHAHRESTANI
/s/ Neil Shahrestani


EXHIBIT INDEX

 

Exhibit

  

Description of Exhibit

99.1    Joint Filing Agreement (filed herewith).
EX-99.1

EXHIBIT 99.1

JOINT FILING AGREEMENT

November 17, 2020

Pursuant to and in accordance with the Securities Exchange Act of 1934, as amended (the “Act”), and the rules and regulations thereunder, each party hereto hereby agrees to the joint filing, on behalf of each of them, of any filing required by such party under Section 13 or Section 16 of the Act or any rule or regulation thereunder (including any amendment, restatement, supplement, and/or exhibit thereto) with the Securities and Exchange Commission (and, if such security is registered on a national securities exchange, also with the exchange), and further agrees to the filing, furnishing, and/or incorporation by reference of this Joint Filing Agreement as an exhibit thereto. This Joint Filing Agreement shall remain in full force and effect until revoked by any party hereto in a signed writing provided to each other party hereto, and then only with respect to such revoking party.

IN WITNESS WHEREOF, each party hereto, being duly authorized, has caused this Joint Filing Agreement to be executed and effective as of the date first written above.

 

IKARIAN CAPITAL, LLC
By:   Chart Westcott Living Trust
Its:   Manager
By:  

/s/ Chart Westcott

  Chart Westcott, Trustee
IKARIAN HEALTHCARE MASTER FUND, L.P.
By:   Ikarian Healthcare Fund GP, L.P.
Its:   General Partner
By:   Ikarian Capital, LLC
Its:   General Partner
By:   Chart Westcott Living Trust
Its:   Manager
By:  

/s/ Chart Westcott

  Chart Westcott, Trustee
IKARIAN HEALTHCARE FUND GP, L.P.
By:   Ikarian Capital, LLC
Its:   General Partner
By:   Chart Westcott Living Trust
Its:   Manager
By:  

/s/ Chart Westcott

  Chart Westcott, Trustee


CHART WESTCOTT LIVING TRUST
By:   /s/ Chart Westcott
  Chart Westcott, Trustee
NEIL SHAHRESTANI
/s/ Neil Shahrestani