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Bambusa Therapeutics, Inc. (BBTX) shares are reported as beneficially owned by ATHOS KG, Objektgesellschaft Salzufer 1 GmbH, Salzufer Holding Inc. and Thomas Maier, each reporting shared voting and dispositive power over 4,579,067 shares, or 9.0%. Salzufer Holding Inc. holds those shares of record; Objektgesellschaft Salzufer 1 GmbH and ATHOS KG may be deemed to beneficially own them through their ownership chain.
Thomas Maier, general partner of ATHOS KG, also reports 120,121 shares held of record by See Property Partners GmbH for his benefit, over which he may be deemed to have sole voting and dispositive power. His total reported beneficial ownership is 4,699,188 shares, or 9.2%. The percentages are based on 50,942,430 shares outstanding immediately after the IPO, assuming no exercise of the underwriters’ option.
Key Figures
Shared voting and dispositive power:4,579,067 sharesReported ownership percentage:9.0%Sole voting and dispositive power:120,121 shares+2 more
5 metrics
Shared voting and dispositive power4,579,067 sharesReported by each of the four reporting persons
Reported ownership percentage9.0%Reported for each reporting person’s shared position
Sole voting and dispositive power120,121 sharesHeld of record by See Property Partners GmbH for Thomas Maier’s benefit
Thomas Maier beneficial ownership4,699,188 sharesReported total, representing 9.2%
Shares outstanding50,942,430 sharesImmediately after the IPO; percentage calculation assumes no exercise of the underwriters’ option
Key Terms
beneficially own, shared voting power, shared dispositive power
3 terms
beneficially ownregulatory
"may be deemed to beneficially own the securities held by Salzufer"
Beneficially own means having the economic rights and risks of a security—such as the right to receive dividends, sell the shares, or profit from price changes—whether or not your name appears on the official share register. Think of it like renting a car: you use it and reap the benefits even if the title lists someone else. Investors care because beneficial ownership determines who truly controls value, must be disclosed under securities rules, and can signal potential influence or trading activity that affects a stock’s price.
shared voting powerregulatory
"Shared Voting Power 4,579,067.00"
Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.
shared dispositive powerregulatory
"Shared Dispositive Power 4,579,067.00"
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
How many BBTX shares does Thomas Maier report as beneficially owned?
Thomas Maier reports beneficial ownership of 4,699,188 shares, or 9.2%. This includes 4,579,067 shares over which he reports shared voting and dispositive power and 120,121 shares held of record by See Property Partners GmbH for his benefit, over which he may be deemed to have sole voting and dispositive power.
Who holds the 4,579,067 BBTX shares of record?
Salzufer Holding Inc. holds the 4,579,067 shares of record. Objektgesellschaft Salzufer 1 GmbH is its sole shareholder, and ATHOS KG is the sole member of Objektgesellschaft Salzufer 1 GmbH; both may be deemed to beneficially own Salzufer Holding Inc.’s shares.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
Bambusa Therapeutics, Inc.
(Name of Issuer)
Common Stock, par value $0.00001 per share
(Title of Class of Securities)
058937103
(CUSIP Number)
10/29/2026
(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)
schemaVersion:
SCHEDULE 13G
CUSIP Number(s):
058937103
1
Names of Reporting Persons
ATHOS KG
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
GERMANY
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
4,579,067.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
4,579,067.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,579,067.00
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)
9.0 %
12
Type of Reporting Person (See Instructions)
OO
SCHEDULE 13G
CUSIP Number(s):
058937103
1
Names of Reporting Persons
Objektgesellschaft Salzufer 1 GmbH
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
GERMANY
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
4,579,067.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
4,579,067.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,579,067.00
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)
9.0 %
12
Type of Reporting Person (See Instructions)
OO
SCHEDULE 13G
CUSIP Number(s):
058937103
1
Names of Reporting Persons
Salzufer Holding Inc.
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
0.00
6
Shared Voting Power
4,579,067.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
4,579,067.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,579,067.00
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)
9.0 %
12
Type of Reporting Person (See Instructions)
CO
SCHEDULE 13G
CUSIP Number(s):
058937103
1
Names of Reporting Persons
Thomas Maier
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
GERMANY
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
120,121.00
6
Shared Voting Power
4,579,067.00
7
Sole Dispositive Power
120,121.00
8
Shared Dispositive Power
4,579,067.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,699,188.00
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)
9.2 %
12
Type of Reporting Person (See Instructions)
IN
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
Bambusa Therapeutics, Inc.
(b)
Address of issuer's principal executive offices:
22 BOSTON WHARF ROAD, FLOOR 7, BOSTON, MASSACHUSETTS, 02210.
Item 2.
(a)
Name of person filing:
This Schedule 13G is being jointly filed by ATHOS KG, Objektgesellschaft Salzufer 1 GmbH (Salzufer 1), Salzufer Holding Inc. (Salzufer) and Thomas Maier, each of the foregoing, a Reporting Person, and collectively, the Reporting Persons. The securities reported herein are held of record by Salzufer, other than 120,121 shares of Common Stock held of record by See Property Partners GmbH for the benefit of Mr. Maier, as to which Mr. Maier may be deemed to have sole voting and dispositive power. Salzufer 1 is the sole shareholder of Salzufer. ATHOS KG is the sole member of Salzufer 1. As a result, each of Salzufer 1 and ATHOS KG may be deemed to beneficially own the securities held by Salzufer. Thomas Maier is the general partner (komplementar) of ATHOS KG. The limited partners (kommanditisten) of ATHOS KG are members of the families of Thomas and Andreas Strungmann. Mr. Maier disclaims beneficial ownership of the securities held by Salzufer except to the extent of his pecuniary interest therein.
The Reporting Persons have entered into a Joint Filing Agreement, dated November 5, 2026, a copy of which is attached hereto as Exhibit 1, pursuant to which the Reporting Persons have agreed to file this statement jointly in accordance with Rule 13d-1(k)(1) under the Act.
(b)
Address or principal business office or, if none, residence:
The principal business office of each of ATHOS KG, Salzufer 1 and Mr. Maier is Bergfeldstrasse 9, 83607 Holzkirchen, Germany.
The principal business office of Salzufer is 1000 NW 57th Court, Ste 650, Miami, FL 33126.
(c)
Citizenship:
ATHOS KG is a German limited partnership (Kommanditgesellschaft). Salzufer 1 is a German limited liability company (Gesellschaft mit beschrankter Haftung). Salzufer is a Delaware corporation. Mr. Maier is a citizen of Germany.
(d)
Title of class of securities:
Common Stock, par value $0.00001 per share
(e)
CUSIP Number(s):
058937103
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 (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). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
(k)
Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.
Ownership
(a)
Amount beneficially owned:
See the responses to Item 9 on the attached cover pages.
(b)
Percent of class:
See the responses to Item 11 on the attached cover pages, which were calculated based on 50,942,430 shares of Common Stock outstanding immediately after the Issuer's initial public offering, as reported in the Issuer's final prospectus dated October 29, 2026, filed with the Securities and Exchange Commission on October 30, 2026, assuming no exercise of the underwriters' option to purchase additional shares.
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
See the responses to Item 5 on the attached cover pages.
(ii) Shared power to vote or to direct the vote:
See the responses to Item 6 on the attached cover pages.
(iii) Sole power to dispose or to direct the disposition of:
See the responses to Item 7 on the attached cover pages.
(iv) Shared power to dispose or to direct the disposition of:
See the responses to Item 8 on the attached cover pages.
Item 5.
Ownership of 5 Percent or Less of a Class.
Not Applicable
Item 6.
Ownership of more than 5 Percent on Behalf of Another Person.
If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required.
See responses to Item 2(a) and Item 4.
Item 7.
Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary.
See responses to Item 2(a) and Item 4.
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.
ATHOS KG
Signature:
/s/ Thomas Maier
Name/Title:
Authorized Signatory
Date:
11/05/2026
Objektgesellschaft Salzufer 1 GmbH
Signature:
/s/ Thomas Maier
Name/Title:
Authorized Signatory
Date:
11/05/2026
Salzufer Holding Inc.
Signature:
/s/ Fabian Rivero
Name/Title:
President
Date:
11/05/2026
Thomas Maier
Signature:
/s/ Thomas Maier
Name/Title:
Thomas Maier
Date:
11/05/2026
Exhibit Information
Exhibit 1 - Joint Filing Agreement, dated November 5, 2026
