BlackRock reports 6.9% stake in SI-BONE

BlackRock, Inc. amended a Schedule 13G to report beneficial ownership of 3,057,039 shares of SI-BONE, Inc. common stock, representing 6.9% of the class.

Rhea-AI Filing Summary

BlackRock, Inc. amended a Schedule 13G to report beneficial ownership of 3,057,039 shares of SI-BONE, Inc. common stock, representing 6.9% of the class. The filing shows sole voting power for 2,997,105 shares and sole dispositive power for 3,057,039 shares. The amendment is signed by Spencer Fleming, Managing Director on 04/24/2026.

Insights

Institutional Ownership Analyst

BlackRock discloses a 6.9% stake in SI-BONE; voting and dispositive powers are concentrated.

BlackRock reports beneficial ownership of 3,057,039 shares representing 6.9% of SI-BONE common stock, with sole voting power over 2,997,105 shares. The filing attributes holdings to Reporting Business Units of BlackRock, Inc.

Ownership above 5% must be reported and can affect engagement or voting outcomes; the filing notes various third-party rights to dividends but does not identify any single >5% holder. Future filings will show any material changes to this position.

Key Figures

Beneficial ownership: 3,057,039 shares Percent of class: 6.9% Sole voting power: 2,997,105 shares +3 more

6 metrics

Beneficial ownership 3,057,039 shares Amount beneficially owned reported on Schedule 13G/A

Percent of class 6.9% Percent of SI-BONE common stock reported in Item 4(b)

Sole voting power 2,997,105 shares Number with sole power to vote reported in Item 4(c)(i)

Sole dispositive power 3,057,039 shares Number with sole power to dispose reported in Item 4(c)(iii)

CUSIP 825704109 CUSIP for SI-BONE common stock listed on cover information

Signature date 04/24/2026 Filing signed by Spencer Fleming, Managing Director

Key Terms

Schedule 13G/A, beneficially owned, sole dispositive power, Reporting Business Units

4 terms

Schedule 13G/A regulatory

"Amendment No. 6 to Schedule 13G/A reporting beneficial ownership"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

beneficially owned regulatory

"Amount beneficially owned: 3057039 (Item 4)"

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.

sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 3057039"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

Reporting Business Units other

"securities beneficially owned by certain business units (collectively, the "Reporting Business Units")"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What stake does BlackRock hold in SI-BONE (SIBN)?

BlackRock reports beneficial ownership of 3,057,039 shares, equal to 6.9% of SI-BONE common stock. This figure appears on Amendment No. 6 to the Schedule 13G/A filed in the provided excerpt.

How much voting power does BlackRock have in SI-BONE (SIBN)?

The filing shows BlackRock has sole voting power over 2,997,105 shares. It reports no shared voting power for this position in the excerpt provided.

Who signed the Schedule 13G/A amendment for BlackRock on SI-BONE?

Spencer Fleming, Managing Director, signed the amendment on 04/24/2026. The signature and title are included on the form's signature block in the excerpt.

Does the filing identify other persons with dividend or sale rights over these SI-BONE shares?

The filing states that various persons have rights to dividends or proceeds, but it does not identify any single person with more than 5% interest. A list of shareholders of registered investment companies is not required.

What address is listed for BlackRock in this Schedule 13G/A?

BlackRock's principal business office is listed as 50 Hudson Yards, New York, NY 10001 in Item 2(b) of the filing excerpt.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 04/24/2026 - 04:11 PM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 6)

SI-BONE, Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

825704109

(CUSIP Number)

03/31/2026

(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): 825704109

1

Names of Reporting Persons

BlackRock, 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 2,997,105.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 3,057,039.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

3,057,039.00

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)

6.9 %

12

Type of Reporting Person (See Instructions)

HC

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 CA 95050
Item 2.
(a)	Name of person filing: BlackRock, Inc. In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. It does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated from that of the Reporting Business Units in accordance with such release.
(b)	Address or principal business office or, if none, residence: BlackRock, Inc., 50 Hudson Yards New York, NY 10001
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 825704109
Item 4.	Ownership
(a)	Amount beneficially owned: 3057039
(b)	Percent of class: 6.9 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 2997105
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 3057039
	(iv) Shared power to dispose or to direct the disposition of: 0
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. Various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the common stock of SI-BONE, Inc.. No one person's interest in the common stock of SI-BONE, Inc. is more than five percent of the total outstanding common shares.
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 Exhibit 99
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.

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.

BlackRock, Inc.

Signature:	Spencer Fleming
Name/Title:	Managing Director
Date:	04/24/2026

Exhibit Information

Exhibit 24: Power of Attorney Exhibit 99: Item 7