Adage Capital Amends IDEAYA Biosciences Stake

TL;DR

**Adage Capital updated its IDEAYA Biosciences stake, signaling a potential shift in institutional confidence.**

AI Summary

Adage Capital Partners, L.P. filed an amended SC 13G/A on February 7, 2024, indicating a change in their ownership of IDEAYA Biosciences, Inc. common stock as of December 31, 2023. While the exact percentage or share count change isn't explicitly stated in the provided text, the filing signifies an update to their previously reported holdings. This matters to investors because Adage Capital is a significant institutional investor, and changes in their position can signal their confidence (or lack thereof) in IDEAYA's future prospects.

Why It Matters

Large institutional investors like Adage Capital Partners often conduct extensive research, so their buying or selling activity can influence market sentiment and the stock price of IDEAYA Biosciences.

Risk Assessment

Risk Level: low — This filing is a routine disclosure of ownership changes by a large investor and does not inherently indicate a high-risk event for the company.

Analyst Insight

Investors should monitor subsequent filings from Adage Capital Partners for IDEAYA Biosciences to understand the magnitude and direction of their ownership changes, which could provide insights into institutional sentiment.

Key Players & Entities

• IDEAYA Biosciences, Inc. (company) — the subject company whose securities are being reported
• Adage Capital Partners, L.P. (company) — the reporting person filing the SC 13G/A
• December 31, 2023 (date) — the date of the event which required the filing
• Delaware (company) — place of organization for Adage Capital Partners, L.P.

FAQ

Key Financial Figures

• $0.0001 — me of Issuer) Common Stock, par value $0.0001 per share (Title of Class of Securitie

Filing Documents

• p24-0430sc13ga.htm (SC 13G/A) — 96KB
• 0000902664-24-001184.txt ( ) — 98KB

(a)

Item 1(a). NAME OF ISSUER The name of the issuer is IDEAYA Biosciences, Inc. (the “ Company ”).

(b)

Item 1(b). ADDRESS OF ISSUER’S PRINCIPAL EXECUTIVE OFFICES The Company’s principal executive offices are located at 7000 Shoreline Court, Suite 350, South San Francisco, California 94080.

(a)

Item 2(a). NAME OF PERSON FILING This statement is filed by: (i) Adage Capital Partners, L.P., a Delaware limited partnership (“ ACP ”) with respect to the Common Stock directly owned by it; (ii) Adage Capital Partners GP, L.L.C., a limited liability company organized under the laws of the State of Delaware (“ ACPGP ”), as general partner of ACP with respect to the Common Stock directly owned by ACP; (iii) Adage Capital Advisors, L.L.C., a limited liability company organized under the laws of the State of Delaware (“ ACA ”), as managing member of ACPGP, general partner of ACP, with respect to the Common Stock directly owned by ACP; (iv) Robert Atchinson (“ Mr. Atchinson ”), as managing member of ACA, managing member of ACPGP, general partner of ACP with respect to the Common Stock directly owned by ACP; and (v) Phillip Gross (“ Mr. Gross ”), as managing member of ACA, managing member of ACPGP, general partner of ACP with respect to the Common Stock directly owned 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)

Item 2(b). ADDRESS OF 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)

Item 2(c). CITIZENSHIP ACP is a limited partnership organized under the laws of the State of Delaware. ACPGP and ACA are limited liability companies organized under the laws of the State of Delaware. Messrs. Gross and Atchinson are citizens of the United States.

(d)

Item 2(d). TITLE OF CLASS OF SECURITIES Common stock, par value $0.0001 per share (the “ Common Stock ”).

(e)

Item 2(e). CUSIP NUMBER 45166A102 CUSIP No. 45166A102 13G/A Page 8 of 10 Pages Item 3. IF THIS STATEMENT IS FILED PURSUANT TO Rules 13d-1(b), OR 13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A: (a) Broker or dealer registered under Section 15 of the Act; (b) Bank as defined in Section 3(a)(6) of the Act; (c) Insurance company as defined in Section 3(a)(19) of the Act; (d) Investment company registered under Section 8 of the Investment Company Act of 1940; (e) An investment adviser in accordance with Rule 13d-1(b)(1)(ii)(E); (f) An employee benefit plan or endowment fund in accordance with Rule 13d-1(b)(1)(ii)(F); (g) A parent holding company or control person in accordance with Rule 13d-1(b)(1)(ii)(G); (h) A savings association as defined in Section 3(b) of the Federal Deposit Insurance Act; (i) A church plan that is excluded from the definition of an investment company under Section 3(c)(14) of the Investment Company Act; (j) A non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J); (k) Group, in accordance with Rule 13d-1(b)(1)(ii)(K). If filing as a non-U.S. institution in accordance with Rule 13d-1(b)(1)(ii)(J), please specify the type of institution: Not applicable . Item 4. A. Adage Capital Partners, L.P., Adage Capital Partners GP, L.L.C. and Adage Capital Advisors, L.L.C. (a) Amount beneficially owned: 2,925,094 (b) Percent of class: 4.54%. The percentage set forth in this Schedule 13G/A is calculated based upon 64,459,472 shares of Common Stock outstanding as of November 3, 2023, as reported in the Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2023, filed with the Securities and Exchange Commission on November 7, 2023. (c) (i) Sole power to vote or direct the vote: 0 (ii) Shared power to vote or direct the vote: 2,925,094 (iii) Sole power to dispose or direct the disposition: 0 (iv) Shared power to dispose or di

SIGNATURES

SIGNATURES After reasonable inquiry and to the best of his or its knowledge and belief, each of the undersigned certifies that the information set forth in this statement is true, complete and correct. DATE: February 7, 2024 ADAGE CAPITAL PARTNERS, L.P. By: Adage Capital Partners GP, L.L.C., its general partner By: Adage Capital Advisors, L.L.C., its managing member /s/ Robert Atchinson Name: Robert Atchinson Title: Managing Member ADAGE CAPITAL PARTNERS GP, L.L.C. By: Adage Capital Advisors, L.L.C., its managing member /s/ Robert Atchinson Name: Robert Atchinson Title: Managing Member ADAGE CAPITAL ADVISORS, L.L.C. /s/ Robert Atchinson Name: Robert Atchinson Title: Managing Member ROBERT ATCHINSON /s/ Robert Atchinson ROBERT ATCHINSON, individually PHILLIP GROSS /s/ Phillip Gross PHILLIP GROSS, individually

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View this SC 13G/A filing on SEC EDGAR