RTW Investments and Roderick Wong report a 2,000,000-share position in Beta Bionics, Inc. The filing amends prior disclosures and shows the Reporting Persons share voting and dispositive power over 2,000,000 shares, representing 4.5% of the common stock based on 44,561,695 shares outstanding as of March 23, 2026. The shares are held on behalf of the RTW Funds and the statement clarifies ownership and power allocations; signature date is May 15, 2026.
Positive
None.
Negative
None.
Insights
RTW Investments holds a disclosed 4.5% stake via 2,000,000 shared shares.
The Schedule 13G/A amendment lists 2,000,000 shares of Common Stock with shared voting and dispositive power attributed to RTW Investments and Dr. Roderick Wong, tied to the RTW Funds. The percentage is calculated from an explicit March 23, 2026 outstanding share count of 44,561,695.
Cash‑flow treatment and sale intentions are not stated in the excerpt; subsequent public filings or proxy disclosures would show any changes in holdings or voting arrangements.
Key Figures
Reported shares:2,000,000 sharesPercent of class:4.5%Shares outstanding (base):44,561,695 shares+1 more
4 metrics
Reported shares2,000,000 sharesShared voting/dispositive power reported in Schedule 13G/A
Percent of class4.5%Calculated from 44,561,695 shares outstanding as of March 23, 2026
Shares outstanding (base)44,561,695 sharesOutstanding common stock as of March 23, 2026 (proxy statement cited)
Filing amendment dateMay 15, 2026Signature date on Amendment No. 2 Schedule 13G/A
Key Terms
Schedule 13G/A, beneficially owned, shared dispositive power
3 terms
Schedule 13G/Aregulatory
"Amendment No. 2; filing type reporting passive/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 ownedfinancial
"Amount beneficially owned: The information required by Item 4(a) is set forth"
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 powerfinancial
"Shared power to dispose or to direct the disposition of: 2,000,000 Shares"
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 2)
BETA BIONICS, INC.
(Name of Issuer)
Common Stock, $0.0001 par value
(Title of Class of Securities)
08659B102
(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):
08659B102
1
Names of Reporting Persons
RTW Investments, 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
2,000,000.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
2,000,000.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
2,000,000.00
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)
4.5 %
12
Type of Reporting Person (See Instructions)
IA, PN
SCHEDULE 13G
CUSIP Number(s):
08659B102
1
Names of Reporting Persons
Roderick Wong
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
UNITED STATES
Number of Shares Beneficially Owned by Each Reporting Person With:
5
Sole Voting Power
0.00
6
Shared Voting Power
2,000,000.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
2,000,000.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
2,000,000.00
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)
4.5 %
12
Type of Reporting Person (See Instructions)
HC, IN
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
BETA BIONICS, INC.
(b)
Address of issuer's principal executive offices:
11 Hughes, Irvine, CA, 92618.
Item 2.
(a)
Name of person filing:
This statement is filed by:
(i) RTW Investments, LP ("RTW Investments"), a Delaware limited partnership and the investment adviser to certain funds (the "RTW Funds"), with respect to shares of Common Stock, par value $0.0001 per share (the "Shares") of Beta Bionics, Inc. (the "Company") directly held by the RTW Funds; and
(ii) Roderick Wong, M.D. ("Dr. Wong"), the Managing Partner and Chief Investment Officer of RTW Investments, with respect to the Shares directly held by the RTW Funds.
The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons."
The filing of this statement should not be construed as an admission that any of the foregoing persons or any Reporting Person is, for the purposes of Section 13 of the Securities Exchange Act of 1934, as amended, the beneficial owner of the Shares reported herein.
(b)
Address or principal business office or, if none, residence:
The address of the business office of each of the Reporting Persons is 40 10th Avenue, Floor 7, New York, New York 10014.
(c)
Citizenship:
RTW Investments is a Delaware limited partnership. Dr. Wong is a citizen of the United States.
(d)
Title of class of securities:
Common Stock, $0.0001 par value
(e)
CUSIP No.:
08659B102
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:
The information required by Item 4(a) is set forth in Rows 5 - 9 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The percentages set forth in Row 11 of the cover pages are calculated based upon 44,561,695 Shares outstanding as of March 23, 2026 as reported in the Company's definitive proxy statement, filed with the Securities and Exchange Commission (the "SEC") on April 10, 2026.
(b)
Percent of class:
RTW Investments: 4.5%
Dr. Wong: 4.5%
(c)
Number of shares as to which the person has:
(i) Sole power to vote or to direct the vote:
RTW Investments: 0
Dr. Wong: 0
(ii) Shared power to vote or to direct the vote:
RTW Investments: 2,000,000 Shares
Dr. Wong: 2,000,000 Shares
(iii) Sole power to dispose or to direct the disposition of:
RTW Investments: 0
Dr. Wong: 0
(iv) Shared power to dispose or to direct the disposition of:
RTW Investments: 2,000,000 Shares
Dr. Wong: 2,000,000 Shares
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.
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 Item 2. The RTW Funds have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the Shares reported herein.
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.
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.
RTW Investments, LP
Signature:
/s/ Roderick Wong, M.D.
Name/Title:
Roderick Wong, M.D., Managing Partner
Date:
05/15/2026
Roderick Wong
Signature:
s/ Roderick Wong, M.D.
Name/Title:
Roderick Wong, M.D.
Date:
05/15/2026
Exhibit Information
Exhibit 99.1 Joint Filing Agreement (incorporated by reference to Exhibit 99.1 to the Reporting Persons' Schedule 13G filed with the SEC on May 15, 2025).
