UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C.  20549

SCHEDULE 13G

Under the Securities Exchange Act of 1934
(Amendment No. 1 )*

Oruka Therapeutics, Inc.
(Name of Issuer)

Common Stock, par value $0.001 per share
(Title of Class of Securities)

687604108
(CUSIP Number)

September 30, 2024
(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)
[x]             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 disclosures provided in a prior cover page.

The information required on 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).



1.
NAMES OF REPORTING PERSONS
 
 
 
Allostery Master Fund LP
 
 
2.
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 
 
 
(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
 
 
 
43,557*
 
 
7.
SOLE DISPOSITIVE POWER
 
 
 
0
 
 
8.
SHARED DISPOSITIVE POWER
 
 
 
43,557*
 
 
9.
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
 
 
43,557*
 
 
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)
 
 
 
0.3%
 
 
12.
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
 
 
 
PN
 
 

*Excluding 8,000 shares of Common Stock issuable upon the conversion of 8 shares of Series A Non-Voting Preferred Stock which are not convertible within 60 days.


1.
NAMES OF REPORTING PERSONS
 
 
 
Allostery Investments LP
 
 
2.
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 
 
 
(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
 
 
 
43,557*
 
 
7.
SOLE DISPOSITIVE POWER
 
 
 
0
 
 
8.
SHARED DISPOSITIVE POWER
 
 
 
43,557*
 
 
9.
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
 
 
43,557*
 
 
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)
 
 
 
0.3%
 
 
12.
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
 
 
 
PN
 

*Excluding 8,000 shares of Common Stock issuable upon the conversion of 8 shares of Series A Non-Voting Preferred Stockwhich are not convertible within 60 days.




 
1.
NAMES OF REPORTING PERSONS
   
 
   
Allostery Investments GP LLC
   
 
 
2.
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
   
 
   
(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
   
 
   
43,557*
   
 
 
7.
SOLE DISPOSITIVE POWER
   
 
   
0
   
 
 
8.
SHARED DISPOSITIVE POWER
   
 
   
43,557*
   
 
 
9.
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
   
 
   
43,557*
   
 
 
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)
   
 
   
0.3%
   
 
 
12.
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
   
 
   
OO
 

*Excluding 8,000 shares of Common Stock issuable upon the conversion of 8 shares of Series A Non-Voting Preferred Stock which are not convertible within 60 days.




1.
NAMES OF REPORTING PERSONS
 
 
 
Christopher Staral
 
 
2.
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 
 
 
(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
 
 
 
43,557*
 
 
7.
SOLE DISPOSITIVE POWER
 
 
 
0
 
 
8.
SHARED DISPOSITIVE POWER
 
 
 
43,557*
 
 
9.
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
 
 
43,557*
 
 
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)
 
 
 
0.3%
 
 
12.
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
 
 
 
IN
 

*Excluding 8,000 shares of Common Stock issuable upon the conversion of 8 shares of Series A Non-Voting Preferred Stockwhich are not convertible within 60 days.


1.
NAMES OF REPORTING PERSONS
 
 
 
David Modest
 
 
2.
CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP
 
 
 
(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
 
 
 
43,557*
 
 
7.
SOLE DISPOSITIVE POWER
 
 
 
0
 
 
8.
SHARED DISPOSITIVE POWER
 
 
 
43,557*
 
 
9.
AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON
 
 
 
43,557*
 
 
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)
 
 
 
0.3%
 
 
12.
TYPE OF REPORTING PERSON (SEE INSTRUCTIONS)
 
 
 

IN
 

*Excluding 8,000 shares of Common Stock issuable upon the conversion of 8 shares of Series A Non-Voting Preferred Stockwhich are not convertible within 60 days.

Item 1(a).                    Name of Issuer:

Oruka Therapeutics, Inc. (“Issuer”) (f/k/a ARCA biopharma, Inc.)

Item 1(b).
Address of Issuer’s Principal Executive Offices:

855 Oak Grove Ave., Suite 100, Menlo Park, CA 94025

Item 2(a).
Name of Persons Filing:

The names of the persons filing this statement on Schedule 13G are (collectively, the “Reporting Persons”):

Allostery Master Fund LP, a Cayman Islands exempted limited partnership (“Allostery Master Fund”);

Allostery Investments LP, a Delaware limited partnership (“Allostery Investments”);

Allostery Investments GP LLC, a Delaware limited liability company (“Allostery Investments GP”);

Christopher Staral, a United States citizen (“Mr. Staral”); and

David Modest, a United States citizen (“Mr. Modest”).

Item 2(b).
Address of Principal Business Office or, if None, Residence:

The principal business address of each of the Reporting Persons is One Stamford Plaza, 9th Floor, 263 Tresser Boulevard, Stamford, CT 06901.

Item 2(c).
Citizenship:

Allostery Master Fund LP is a Cayman Islands exempted limited partnership. Allostery Investments LP is a Delaware limited partnership. Allostery Investments GP LLC is a Delaware limited liability company. Messrs. Staral and Modest are citizens of the United States.

Item 2(d).
Title of Class of Securities:

Common Stock, par value $0.001 per share (the “Common Stock”)

Item 2(e).
CUSIP Number:

687604108


Item 3.
If This Statement is Filed Pursuant to Rule 13d 1(b), or 13d-2(b) or (c), Check Whether the Person Filing is a:

 
(a)
[ ]
Broker or dealer registered under Section 15 of the Exchange Act.
 
 
 
 
 
(b)
[ ]
Bank as defined in Section 3(a)(6) of the Exchange Act.
 
 
 
 
 
(c)
[ ]
Insurance company defined in Section 3(a)(19) of the Exchange Act.
 
 
 
 
 
(d)
[ ]
Investment company registered under Section 8 of the Investment Company Act.
 
 
 
 
 
(e)
[ ]
Investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E).
 
 
 
 
 
(f)
[ ]
Employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F).
 
 
 
 
 
(g)
[ ]
Parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G).
 
 
 
 
 
(h)
[ ]
Savings association as defined in Section 3(b) of the Federal Deposit Insurance Act.
 
 
 
 
 
(i)
[ ]
Church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act;
 
 
 
 
 
(j)
[ ]
Non-U.S. institution in accordance with Section 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 § 240.13d-1(b)(1)(ii)(J), please specify the type of institution: ____

Item 4.
Ownership.

(a)
Amount beneficially owned:

As of September 30, 2024, Allostery Master Fund beneficially owned 43,557 shares of Common Stock (excluding 8,000 shares of Common Stock issuable upon the conversion of 8 shares of Series A Non-Voting Preferred Stock which are not convertible within 60 days).

Allostery Investments, as the investment manager of Allostery Master Fund, may be deemed to have beneficially owned the 43,557 shares of Common Stock beneficially owned by Allostery Master Fund.

Allostery Investments GP, as the general partner of Allostery Investments, may be deemed to have beneficially owned the 43,557 shares of Common Stock beneficially owned by Allostery Investments.

Messrs. Modest and Staral, as the managing members of Allostery Investments GP,  may be deemed to have beneficially owned the 43,557 shares of Common Stock beneficially owned by Allostery Investment GP.

(b)
Percent of Class:

The following percentage is based on 14,507,143 shares of Common Stock outstanding as of July 31, 2024, as disclosed in the Issuer’s Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on August 1, 2024.

As of September 30, 2024, the Reporting Persons may be deemed to have beneficially owned approximately 0.3% of the outstanding Common Stock.

(c)
Number of shares as to which such person has:

(i)
Sole power to vote or to direct the vote:

See Cover Pages Items 5-8.

(ii)
Shared power to vote or to direct the vote:

See Cover Pages Items 5-8.

(iii)
Sole power to dispose or to direct the disposition:

See Cover Pages Items 5-8.

(iv)
Shared power to dispose or to direct the disposition:

See Cover Pages Items 5-8.


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 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.

Not applicable.

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

See Exhibit A to the Schedule 13G filed by the Reporting Persons with the Securities and Exchange Commission on April 15, 2024.

Item 9.
Notice of Dissolution of Group.

Not applicable.

Item 10.
Certification.

By signing below each of the undersigned certifies that, to the best of his or its 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.

SIGNATURES
After reasonable inquiry and to the best of its knowledge and belief, each of the undersigned certifies that the information with respect to it set forth in this statement is true, complete, and correct.

Dated: November 14, 2024

ALLOSTERY MASTER FUND LP
By: Allostery Investments LP, its investment manager
By: Allostery Investments GP LLC, its general partner
 
By:
/s/ David Modest
 
 
David Modest, Managing Member
 
 
 

ALLOSTERY INVESTMENTS LP
By: Allostery Investments GP LLC, its general partner
 
By:
/s/ David Modest
 
 
David Modest, Managing Member

ALLOSTERY INVESTMENTS GP LLC
 
By:
/s/ David Modest
 
 
David Modest, Managing Member

/s/ Christopher Staral
   
CHRISTOPHER STARAL
 

/s/ David Modest
   
DAVID MODEST
 




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