Adage Capital Discloses 5.45% Stake in Tango Therapeutics (5.9M)

Rhea-AI Filing Summary

Adage Capital Management, L.P., together with Robert Atchinson and Phillip Gross, reports beneficial ownership of 5,905,349 shares of Tango Therapeutics common stock, equal to 5.45% of the company’s outstanding shares based on an 108,394,190 share count used in the filing. The reported position shows shared voting and dispositive power of 5,905,349 shares and no sole voting or dispositive power.

The filing is submitted on Schedule 13G and states the securities are held in the ordinary course of business and not for the purpose of changing or influencing control of the issuer.

Positive

• Material disclosed stake: Reporting Persons beneficially own 5,905,349 shares (5.45%), exceeding the 5% reporting threshold.
• Passive classification: The filing is on Schedule 13G and states the securities are held in the ordinary course of business and not to change control.

Negative

• No sole voting or dispositive power is reported, indicating the Reporting Persons do not control voting decisions for the shares.

Insights

Financial Analyst

TL;DR: Adage holds a material passive stake (5.45%) in Tango, signaling meaningful investor interest without control intent.

Adage’s disclosed 5,905,349-share position represents a material ownership level above the 5% reporting threshold and is calculated against 108,394,190 shares outstanding as referenced in the filing. The filing under Schedule 13G and the explicit certification that the securities are held in the ordinary course indicate a passive investment stance rather than an active campaign for control. For market participants, this confirms institutional attention while maintaining the company’s existing governance structure.

Corporate Governance Expert

TL;DR: The reporters disclose only shared voting/dispositive power and assert passive intent, so governance control is not indicated.

The statement shows no sole voting or dispositive power and only shared authority over the 5.45% stake. The Schedule 13G classification and the certification language reduce the likelihood that this holding will be treated as an attempt to influence board composition or corporate control. That said, a >5% passive stake can still prompt issuer engagement; the filing itself contains no indication of activist intent or proposed governance actions.

FAQ

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

Who filed the Schedule 13G for Tango Therapeutics (TNGX)?

The filing was made by Adage Capital Management, L.P. and individuals Robert Atchinson and Phillip Gross as Reporting Persons.

How many Tango Therapeutics (TNGX) shares were reported?

The filing reports beneficial ownership of 5,905,349 shares of common stock.

What percent of Tango Therapeutics does the reported stake represent?

The reported position represents 5.45% of the outstanding common stock, based on 108,394,190 shares used in the filing's calculation.

Do the filers have voting or dispositive power over the shares?

The filers report no sole voting or dispositive power and instead report shared voting and shared dispositive power for 5,905,349 shares.

Is the position reported as passive or activist?

The Schedule 13G includes a certification that the securities are held in the ordinary course of business and were not acquired to change or influence control, indicating a passive position.

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

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Accepted by SEC EDGAR 08/12/2025 - 09:06 AM EDT Learn about SEC filing dates

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

Tango Therapeutics, Inc.

(Name of Issuer)

Common Stock, par value $0.001 per share

(Title of Class of Securities)

87583X109

(CUSIP Number)

06/30/2025

(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. 87583X109

1

Names of Reporting Persons

Adage Capital Management, L.P.

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 5,905,349.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 5,905,349.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,905,349.00

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)

5.45 %

12

Type of Reporting Person (See Instructions)

IA, PN

SCHEDULE 13G

CUSIP No. 87583X109

1

Names of Reporting Persons

Robert Atchinson

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 5,905,349.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 5,905,349.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,905,349.00

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)

5.45 %

12

Type of Reporting Person (See Instructions)

HC, IN

SCHEDULE 13G

CUSIP No. 87583X109

1

Names of Reporting Persons

Phillip Gross

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 5,905,349.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 5,905,349.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

5,905,349.00

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)

5.45 %

12

Type of Reporting Person (See Instructions)

HC, IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Tango Therapeutics, Inc.
(b)	Address of issuer's principal executive offices: 201 Brookline Ave., Suite 901, Boston, MA 02215
Item 2.
(a)	Name of person filing: This statement is filed by: (i) Adage Capital Management, L.P., a Delaware limited partnership ("ACM"), as the investment manager of Adage Capital Partners, L.P., a Delaware limited partnership ("ACP"), with respect to the shares of common stock, par value $0.001 per share ("Common Stock") of Tango Therapeutics, Inc., a Delaware corporation (the "Company") directly held by ACP; (ii) Robert Atchinson ("Mr. Atchinson"), as (1) managing member of Adage Capital Advisors, L.L.C., a limited liability company organized under the laws of the State of Delaware ("ACA"), managing member of Adage Capital Partners GP, L.L.C., a limited liability company organized under the laws of the State of Delaware ("ACPGP"), general partner of ACP and (2) managing member of Adage Capital Partners LLC, a Delaware limited liability company ("ACPLLC"), general partner of ACM, with respect to the shares of Common Stock directly held by ACP; and (iii) Phillip Gross ("Mr. Gross"), as (1) managing member of ACA, managing member of ACPGP and (2) managing member of ACPLLC, general partner of ACM, with respect to the shares of Common Stock directly held by ACP. The foregoing persons are hereinafter sometimes collectively referred to as the "Reporting Persons." Any disclosures herein with respect to persons other than the Reporting Persons are made on information and belief after making inquiry to the appropriate party. The filing of this statement should not be construed in and of itself as an admission by any Reporting Person as to beneficial ownership of the securities 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 200 Clarendon Street, 52nd Floor, Boston, Massachusetts 02116.
(c)	Citizenship: ACM is a limited partnership organized under the laws of the State of Delaware. Messrs. Gross and Atchinson are citizens of the United States.
(d)	Title of class of securities: Common Stock, par value $0.001 per share
(e)	CUSIP No.: 87583X109
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 Row 9 of the cover page for each of the Reporting Persons and is incorporated herein by reference. The percentage set forth in this Schedule 13G is calculated based upon an aggregate of 108,394,190 shares of Common Stock outstanding as of May 5, 2025, as reported in the Company's Quarterly Report on Form 10-Q for the quarterly period ended March 31, 2025, filed with the Securities and Exchange Commission on May 12, 2025.
(b)	Percent of class: 5.45%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: The information required by Item 4(c)(i) is set forth in Row 5 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
	(ii) Shared power to vote or to direct the vote: The information required by Item 4(c)(ii) is set forth in Row 6 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
	(iii) Sole power to dispose or to direct the disposition of: The information required by Item 4(c)(iii) is set forth in Row 7 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
	(iv) Shared power to dispose or to direct the disposition of: The information required by Item 4(c)(iv) is set forth in Row 8 of the cover page for each of the Reporting Persons and is incorporated herein by reference.
Item 5.	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(a).
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.

Adage Capital Management, L.P.

Signature:	/s/ Robert Atchinson
Name/Title:	By: Adage Capital Partners LLC, its General Partner, By: Robert Atchinson, its Managing Member
Date:	08/12/2025

Robert Atchinson

Signature:	/s/ Robert Atchinson
Name/Title:	Robert Atchinson, individually
Date:	08/12/2025

Phillip Gross

Signature:	/s/ Phillip Gross
Name/Title:	Phillip Gross, individually
Date:	08/12/2025

Exhibit Information

Exhibit 99.1: Joint Filing Agreement