T. Rowe Price (BDTX) lists 4.03M shares, 7.0% stake in amendment

Rhea-AI Filing Summary

T. Rowe Price Investment Management, Inc. amended its Schedule 13G/A to report beneficial ownership of 4,028,202 shares of Black Diamond Therapeutics I common stock, representing 7.0% of the class as of 06/30/2026. The filing lists 3,992,774 shares as sole voting power and 4,028,202 as sole dispositive power. The filing also includes a statement that the filer "hereby declares and affirms that the filing of shall not be construed as an admission that Price Investment Management is the beneficial owner of the securities referred to, which beneficial ownership is expressly denied."

Insights

Institutional Ownership Analyst

Large passive stake reported: 4,028,202 shares (7.0%).

The amendment shows T. Rowe Price Investment Management, Inc. holds 4,028,202 shares with sole dispositive power and 3,992,774 shares with sole voting power as of 06/30/2026. This quantifies the firm's visible economic exposure in the issuer.

Filing language also contains an explicit denial of beneficial ownership; the statement should be read as the filer’s legal position about record versus beneficial ownership. Subsequent filings or disclosures by other holders could clarify economic/control status.

Key Figures

Filing type: Schedule 13G/A Amendment No. 4 Shares beneficially owned: 4,028,202 shares Percent of class: 7.0% +3 more

6 metrics

Filing type Schedule 13G/A Amendment No. 4 ownership disclosure amendment

Shares beneficially owned 4,028,202 shares as of 06/30/2026

Percent of class 7.0% percent of common stock

Sole voting power 3,992,774 shares voting power reported in Item 4

Sole dispositive power 4,028,202 shares dispositive power reported in Item 4

CUSIP 09203E105 Black Diamond Therapeutics I common stock identifier

Key Terms

Schedule 13G/A, beneficially owned, sole dispositive power

3 terms

Schedule 13G/A regulatory

"Amendment No. 4 to Schedule 13G/A reporting 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: 4028202"

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: 4028202"

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.

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

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Available on EDGAR 07/08/2026 - 11:30 AM Accepted by SEC EDGAR 07/08/2026 - 11:30 AM Learn about SEC filing dates

FAQ

What stake does T. Rowe Price report in BDTX?

T. Rowe Price reports 4,028,202 shares, equal to 7.0% of common stock, with the position stated as of 06/30/2026. The filing specifies sole voting and dispositive power counts.

How many votes does T. Rowe Price control in BDTX?

The filing lists 3,992,774 shares as the number with sole voting power. Shared voting power is reported as 0 in the amendment.

Does T. Rowe Price claim beneficial ownership of BDTX shares?

The filing includes a clause where the filer "hereby declares and affirms that the filing... shall not be construed as an admission that Price Investment Management is the beneficial owner," expressly denying beneficial ownership.

What document amended the ownership report for BDTX?

This is an Amendment No. 4 to a Schedule 13G for Black Diamond Therapeutics I reporting ownership details by T. Rowe Price Investment Management, Inc.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 4)

BLACK DIAMOND THERAPEUTICS I

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

09203E105

(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): 09203E105

1

Names of Reporting Persons

T. Rowe Price Investment Management, 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

MARYLAND

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 3,992,774.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 4,028,202.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

4,028,202.00

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)

7.0 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

Item 1.
(a)	Name of issuer: BLACK DIAMOND THERAPEUTICS I
(b)	Address of issuer's principal executive offices: ONE MAIN STREET, 14TH FLOOR, CAMBRIDGE, MA, 02142
Item 2.
(a)	Name of person filing: T. Rowe Price Investment Management, Inc.
(b)	Address or principal business office or, if none, residence: 1307 Point Street, Baltimore, MD 21231
(c)	Citizenship: Maryland
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP No.: 09203E105
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: 4028202
(b)	Percent of class: 7.0 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 3992774
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 4028202
	(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.
	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. T. Rowe Price Investment Management, Inc. hereby declares and affirms that the filing of Schedule 13G shall not be construed as an admission that Price Investment Management is the beneficial owner of the securities referred to, which beneficial ownership is expressly denied.

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.

T. Rowe Price Investment Management, Inc.

Signature:	Ellen York
Name/Title:	Vice President
Date:	07/08/2026