Mink Brook reporting persons report beneficial ownership of 190,596 shares (5.4%) of Ekso Bionics common stock. As of the close of business on April 8, 2026, Mink Brook Partners LP held 190,596 shares. The filing states shared voting and shared dispositive power among Mink Brook Capital GP LLC, Mink Brook Asset Management LLC, and William Mueller. The percentage is calculated using 3,563,381 shares outstanding as of February 23, 2026 disclosed in the company’s Form 10-K; the filers include a disclaimer of beneficial ownership except to the extent of pecuniary interest.
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Key Figures
Shares held by Mink Brook Partners LP:190,596 sharesPercent of class:5.4%Shares outstanding used for calculation:3,563,381 shares
3 metrics
Shares held by Mink Brook Partners LP190,596 sharesheld as of April 8, 2026
Percent of class5.4%calculated using 3,563,381 shares outstanding as of February 23, 2026
Shares outstanding used for calculation3,563,381 sharesas of February 23, 2026 (Form 10-K)
"Amount beneficially owned: As of the close of business on April 8th, 2026"
Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.
shared dispositive powerregulatory
"Shared Dispositive Power 190,596.00"
Section 13(d)regulatory
"deemed to constitute an admission ... for purposes of Section 13(d)"
A Section 13(d) filing is a public disclosure required under U.S. securities law when a person or group acquires more than 5% of a company’s registered equity and may influence control. The filer must report who owns the shares, how they were acquired, and any plans or intentions for the company, so the market and other shareholders can see if a large buyer is attempting a takeover or other strategic move. Think of it like a formal announcement that someone has crossed a threshold and is showing their hand.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
What stake does Mink Brook Partners hold in EKSO?
Mink Brook Partners LP holds 190,596 shares, equal to 5.4% of Ekso Bionics. The percentage uses 3,563,381 shares outstanding as of February 23, 2026 per the Form 10-K; the position is reported as shared voting and dispositive power.
Who else is listed with shared power over the EKSO shares?
Mink Brook Capital GP LLC, Mink Brook Asset Management LLC, and William Mueller are listed as having shared voting and shared dispositive power over 190,596 shares. The filings state these relationships reflect managerial roles and include a limited ownership disclaimer.
What date is the ownership based on in the Schedule 13G filing?
The ownership amount is reported as of the close of business on April 8, 2026. The percentage calculation references 3,563,381 shares outstanding as of February 23, 2026, per the company’s Form 10-K.
Does the filing claim sole voting or sole dispositive power for these shares?
No. Each filer reports 0 shares of sole voting power and sole dispositive power and 190,596 shares of shared voting and shared dispositive power.
Is the reporting person admitting beneficial ownership under Section 13(d)?
No. The filing explicitly disclaims that William Mueller and Mink Brook Capital GP LLC are the beneficial owners for purposes of Section 13(d), except to the extent of any pecuniary interest, per the filing language.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
EKSO BIONICS HOLDINGS, INC.
(Name of Issuer)
Common Stock
(Title of Class of Securities)
282644400
(CUSIP Number)
04/08/2026
(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):
282644400
1
Names of Reporting Persons
Mink Brook Partners LP
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
190,596.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
190,596.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
190,596.00
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)
5.4 %
12
Type of Reporting Person (See Instructions)
OO
Comment for Type of Reporting Person: This percentage is calculated based upon 3,563,381 shares outstanding as of 2/23/26 disclosed in the company's Form 10-K
SCHEDULE 13G
CUSIP Number(s):
282644400
1
Names of Reporting Persons
Mink Brook Capital GP 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
0.00
6
Shared Voting Power
190,596.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
190,596.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
190,596.00
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)
5.4 %
12
Type of Reporting Person (See Instructions)
OO
Comment for Type of Reporting Person: This percentage is calculated based upon 3,563,381 shares outstanding as of 2/23/26 disclosed in the company's Form 10-K
SCHEDULE 13G
CUSIP Number(s):
282644400
1
Names of Reporting Persons
William Mueller
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
190,596.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
190,596.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
190,596.00
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)
5.4 %
12
Type of Reporting Person (See Instructions)
OO
Comment for Type of Reporting Person: This percentage is calculated based upon 3,563,381 shares outstanding as of 2/23/26 disclosed in the company's Form 10-K
SCHEDULE 13G
CUSIP Number(s):
282644400
1
Names of Reporting Persons
Mink Brook Asset Management 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
0.00
6
Shared Voting Power
190,596.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
190,596.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
190,596.00
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)
5.4 %
12
Type of Reporting Person (See Instructions)
OO
Comment for Type of Reporting Person: This percentage is calculated based upon 3,563,381 shares outstanding as of 2/23/26 disclosed in the company's Form 10-K
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
EKSO BIONICS HOLDINGS, INC.
(b)
Address of issuer's principal executive offices:
101 GLACIER POINT, SUITE A, SAN RAFAEL, CALIFORNIA, 94901.
Item 2.
(a)
Name of person filing:
Mink Brook Partners LP
Mink Brook Capital GP LLC
William Mueller
Mink Brook Asset Management LLC
(b)
Address or principal business office or, if none, residence:
201 Summa Street
West Palm Beach, FL 33405
(c)
Citizenship:
Mink Brook Partners LP - Delaware
Mink Brook Capital GP LLC - Delaware
William Mueller - Florida
Mink Brook Asset Management LLC - Delaware
(d)
Title of class of securities:
Common Stock
(e)
CUSIP Number(s):
282644400
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:
Amount beneficially owned: As of the close of business on April 8th, 2026, Mink Brook Partners LP held an aggregate of 190,596 shares of the common stock of the Issuer. As the general partner to Mink Brook Partners LP, Mink Brook Capital GP LLC may be deemed to have shared power to vote or to direct the vote and to dispose or to direct the disposition of the shares held by Mink Brook Partners LP. As the managing member of Mink Brook Capital GP LLC and Mink Brook Asset Management LLC, William Mueller may be deemed to have shared power to vote or to direct the vote and to dispose or to direct the disposition of the shares held by Mink Brook Partners LP.
Neither the filing of this Schedule 13G nor any of its contents shall be deemed to constitute an admission that Mr. Mueller or Mink Brook Capital GP LLC is the beneficial owner of the shares of the common stock of the Issuer referred to herein for purposes of Section 13(d) of the Securities Exchange Act of 1934, as amended, or for any other purpose, and such beneficial ownership is expressly disclaimed, except to the extent of their respective pecuniary interests therein.
(b)
Percent of class:
Mink Brook Partners LP - 5.4%
Mink Brook Capital GP LLC - 5.4%
William Mueller - 5.4%
Mink Brook Asset Management LLC - 5.4%
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
Mink Brook Partners LP - 0
Mink Brook Capital GP LLC - 0
William Mueller - 0
Mink Brook Asset Management LLC - 0
(ii) Shared power to vote or to direct the vote:
Mink Brook Partners LP - 190,596
Mink Brook Capital GP LLC - 190,596
William Mueller - 190,596
Mink Brook Asset Management LLC - 190,596
(iii) Sole power to dispose or to direct the disposition of:
Mink Brook Partners LP - 0
Mink Brook Capital GP LLC - 0
William Mueller - 0
Mink Brook Asset Management LLC - 0
(iv) Shared power to dispose or to direct the disposition of:
Mink Brook Partners LP - 190,596
Mink Brook Capital GP LLC - 190,596
William Mueller - 190,596
Mink Brook Asset Management LLC - 190,596
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.
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.
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.
Mink Brook Partners LP
Signature:
/s/ William Mueller
Name/Title:
Managing Member, general partner Mink Brook Capital GP LLC
Date:
04/09/2026
Mink Brook Capital GP LLC
Signature:
/s/ William Mueller
Name/Title:
Managing Member, general partner Mink Brook Capital GP LLC
