Champlain reports 4.9% SI-BONE (SIBN) stake in Schedule 13G filing

Rhea-AI Filing Summary

Champlain Investment Partners, LLC reported beneficial ownership of 2,108,944 shares of SI-BONE, Inc. common stock, representing 4.9% of the class as of 09/30/2025. Champlain has sole voting power over 1,337,489 shares and sole dispositive power over 2,108,944 shares, with no shared voting or dispositive power.

The firm files as an institutional investment adviser and certifies that the shares were acquired and are held in the ordinary course of business, not for the purpose or effect of changing or influencing control of SI-BONE, Inc.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

SI-BONE, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

825704109

(CUSIP Number)

09/30/2025

(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)

SCHEDULE 13G

CUSIP No. 825704109

1

Names of Reporting Persons

Champlain Investment Partners, 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

VERMONT

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 1,337,489.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,108,944.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,108,944.00

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)

4.9 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: SI-BONE, Inc.
(b)	Address of issuer's principal executive offices: 471 EL CAMINO REAL, SUITE 101, SANTA CLARA, CALIFORNIA, 95050
Item 2.
(a)	Name of person filing: Champlain Investment Partners, LLC
(b)	Address or principal business office or, if none, residence: 180 Battery St., Burlington, Vermont 05401
(c)	Citizenship: Vermont
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 825704109
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: 2108944
(b)	Percent of class: 4.9 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 1337489
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 2108944
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
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 acquired and are held in the ordinary course of business and 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. 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.

Champlain Investment Partners, LLC

Signature:	Matthew Garcia
Name/Title:	Chief Compliance Officer
Date:	02/12/2026

FAQ

What does Champlain Investment Partners’ Schedule 13G for SIBN show?

Champlain Investment Partners’ Schedule 13G shows it beneficially owns 2,108,944 shares of SI-BONE, Inc. common stock, equal to 4.9% of the outstanding class. The filing characterizes this as ordinary-course investing, not aimed at changing or influencing control of SI-BONE.

How many SI-BONE (SIBN) shares does Champlain Investment Partners own?

Champlain Investment Partners reports beneficial ownership of 2,108,944 shares of SI-BONE common stock, representing 4.9% of the class. This ownership is below the 5% threshold often associated with larger reporting positions but still reflects a meaningful institutional stake in the company.

What voting and dispositive powers does Champlain have over SIBN shares?

Champlain has sole voting power over 1,337,489 SI-BONE shares and sole dispositive power over 2,108,944 shares, with no shared voting or dispositive authority. This means Champlain alone decides how those shares are voted and when they may be sold or otherwise disposed of.

Is Champlain Investment Partners seeking to influence control of SI-BONE (SIBN)?

Champlain certifies the SI-BONE shares were acquired and are held in the ordinary course of business, not to change or influence control. The firm also states the holdings are not related to any transaction intended to affect control, aside from limited proxy nomination activities.

Why is Champlain Investment Partners filing a Schedule 13G on SIBN?

Champlain files Schedule 13G because it is an institutional investor that crossed a reporting threshold in SI-BONE stock and qualifies for the short-form 13G. The firm reports a 4.9% passive stake and confirms its role as an investment adviser under the applicable SEC rule.

What percentage of SI-BONE (SIBN) does Champlain’s stake represent?

Champlain’s reported beneficial ownership of 2,108,944 SI-BONE shares represents 4.9% of the company’s outstanding common stock. This percentage places Champlain just under the 5% level commonly associated with larger holders, while still disclosing a notable institutional position.