[SCHEDULE 13G/A] RadNet, Inc. Amended Passive Investment Disclosure
RTW Investments reports 6.2% stake in RadNet
RTW Investments, LP and Roderick Wong, M.D. report beneficial ownership of 4,846,958 shares of RadNet, Inc. common stock, representing 6.2% of the class, based on 78,634,236 shares outstanding as of May 8, 2026.
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RTW Investments, LP and Roderick Wong, M.D. report beneficial ownership of 4,846,958 shares of RadNet, Inc. common stock, representing 6.2% of the class, based on 78,634,236 shares outstanding as of May 8, 2026.
Both reporting persons have shared voting and dispositive power over all 4,846,958 shares and no sole voting or dispositive power. The shares are directly held by certain RTW-managed funds, which have the right to receive dividends and sale proceeds on these shares.
Key Figures
Shares beneficially owned:4,846,958 sharesPercent of class:6.2%Shares outstanding:78,634,236 shares+2 more
5 metrics
Shares beneficially owned4,846,958 sharesRadNet common stock beneficially owned by RTW Investments and Roderick Wong
Percent of class6.2%Ownership percentage of RadNet common stock based on 78,634,236 shares outstanding
Shares outstanding78,634,236 sharesRadNet common stock outstanding as of May 8, 2026
Shared voting power4,846,958 sharesShares over which RTW Investments and Roderick Wong share voting power
Shared dispositive power4,846,958 sharesShares over which RTW Investments and Roderick Wong share dispositive power
Key Terms
beneficial owner, shared voting power, shared dispositive power, percent of class, +1 more
5 terms
beneficial ownerregulatory
"for the purposes of Section 13 of the Securities Exchange Act of 1934, as amended, the beneficial owner of the Shares reported"
A beneficial owner is the person who ultimately owns or controls a financial asset or property, even if their name isn't directly on official documents. Think of it like someone who secretly holds the keys to a safe deposit box—others may appear to have access, but the true owner is the one who benefits from what's inside. Identifying beneficial owners helps ensure transparency and prevent illegal activities like money laundering or fraud.
shared voting powerregulatory
"Shared Voting Power 4,846,958.00"
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 4,846,958.00"
percent of classfinancial
"The percentages set forth in Row 11 of the cover pages are calculated based upon 78,634,236 Shares outstanding"
Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.
investment adviserfinancial
"RTW Investments, LP, a Delaware limited partnership and the investment adviser to certain funds"
An investment adviser is a person or firm that professionally manages money and gives recommendations about buying, selling, or holding investments. Like a financial coach or guide, they have a legal duty to act in a client's best financial interest, so their advice, fees and potential conflicts can directly affect returns and risk — making their role important for investors who want informed, accountable help with portfolios.
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
How much of RadNet, Inc. (RDNT) does RTW Investments currently own?
RTW Investments and Roderick Wong report beneficial ownership of 4,846,958 RadNet shares, equal to 6.2% of the common stock based on 78,634,236 shares outstanding as of May 8, 2026.
Who are the reporting persons in this RadNet (RDNT) Schedule 13G/A?
The reporting persons are RTW Investments, LP, a Delaware investment adviser to certain funds, and Roderick Wong, M.D., its Managing Partner and Chief Investment Officer, regarding RadNet common stock held by RTW-managed funds.
What voting power does RTW Investments have over RadNet (RDNT) shares?
RTW Investments and Roderick Wong report 0 sole voting power and 4,846,958 shares of shared voting power in RadNet, meaning decisions are made jointly with related entities holding the shares.
Who receives dividends from the RadNet (RDNT) shares held by RTW Investments?
The RTW Funds managed by RTW Investments have the right to receive or direct the receipt of dividends and sale proceeds from the 4,846,958 RadNet shares reported as beneficially owned.
How was the 6.2% ownership in RadNet (RDNT) calculated?
The 6.2% ownership figure is based on 78,634,236 RadNet shares outstanding as of May 8, 2026, a share count disclosed in RadNet’s Quarterly Report on Form 10-Q filed on May 11, 2026.
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
SCHEDULE 13G
UNDER THE SECURITIES EXCHANGE ACT OF 1934
(Amendment No. 1)
RadNet, Inc.
(Name of Issuer)
Common Stock, $0.0001 par value
(Title of Class of Securities)
750491102
(CUSIP Number)
06/30/2026
(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):
750491102
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
4,846,958.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
4,846,958.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,846,958.00
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)
6.2 %
12
Type of Reporting Person (See Instructions)
IA, PN
SCHEDULE 13G
CUSIP Number(s):
750491102
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
4,846,958.00
7
Sole Dispositive Power
0.00
8
Shared Dispositive Power
4,846,958.00
9
Aggregate Amount Beneficially Owned by Each Reporting Person
4,846,958.00
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)
6.2 %
12
Type of Reporting Person (See Instructions)
HC, IN
SCHEDULE 13G
Item 1.
(a)
Name of issuer:
RadNet, Inc.
(b)
Address of issuer's principal executive offices:
1510 Cotner Avenue, Los Angeles, CA, 90025.
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 RadNet, 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.:
750491102
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 78,634,236 Shares outstanding as of May 8, 2026, as reported in the Issuer's Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission (the "SEC") on May 11, 2026.
(b)
Percent of class:
RTW Investments: 6.2%
Dr. Wong: 6.2%
(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: 4,846,958 Shares
Dr. Wong: 4,846,958 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: 4,846,958 Shares
Dr. Wong: 4,846,958 Shares
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 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:
08/14/2026
Roderick Wong
Signature:
/s/ Roderick Wong, M.D.
Name/Title:
Roderick Wong, M.D.
Date:
08/14/2026
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 February 17, 2026).
