Adage Capital Partners Reports 8.0% Stake in Compass Therapeutics

TL;DR

**Adage Capital Partners still holds a big 8.0% stake in Compass Therapeutics as of year-end!**

AI Summary

Adage Capital Partners, L.P. filed an amended SC 13G/A on February 7, 2024, indicating a change in their beneficial ownership of Compass Therapeutics, Inc. common stock as of December 31, 2023. This filing shows that Adage Capital Partners, L.P. now beneficially owns 10,776,300 shares, representing 8.0% of the company's common stock. This matters to investors because it signals a significant institutional investor's continued, albeit slightly reduced, confidence in Compass Therapeutics, Inc., which could influence market perception and stock stability.

Why It Matters

This filing shows a major institutional investor's current stake, which can influence market sentiment and signal confidence (or lack thereof) in the company's future prospects.

Risk Assessment

Risk Level: low — This filing indicates a stable, significant institutional ownership, which generally reduces volatility and provides a level of confidence.

Analyst Insight

An investor should note the continued significant institutional ownership by Adage Capital Partners, L.P. and consider it as a factor in their due diligence, but also investigate any changes in the percentage owned compared to previous filings to understand the investor's evolving sentiment.

Key Numbers

• 10,776,300 — shares beneficially owned (total shares of Compass Therapeutics, Inc. common stock owned by Adage Capital Partners, L.P.)
• 8.0% — percentage of class (percentage of Compass Therapeutics, Inc. common stock beneficially owned by Adage Capital Partners, L.P.)
• December 31, 2023 — date of event (the date as of which the ownership change is reported)
• $0.0001 — par value per share (par value of Compass Therapeutics, Inc. common stock)

Key Players & Entities

• Adage Capital Partners, L.P. (company) — the reporting person beneficially owning shares
• Compass Therapeutics, Inc. (company) — the issuer of the securities
• Delaware (company) — place of organization for Adage Capital Partners, L.P.
• Boston (company) — business address city for Compass Therapeutics, Inc. and Adage Capital Partners GP, L.L.C.

Forward-Looking Statements

• Adage Capital Partners, L.P. will maintain a significant stake in Compass Therapeutics, Inc. (Adage Capital Partners, L.P.) — medium confidence, target: Q4 2024

FAQ

Key Financial Figures

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

Filing Documents

• p24-0377sc13ga.htm (SC 13G/A) — 90KB
• 0000902664-24-001129.txt ( ) — 92KB

(a)

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

(b)

Item 1(b). ADDRESS OF ISSUER’S PRINCIPAL EXECUTIVE OFFICES The Company’s principal executive offices are located at 80 Guest St., Suite 601, Boston, Massachusetts 02135.

(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 Management, L.P., a Delaware limited partnership (“ ACM ”), as the investment manager of ACP, with respect to the Common Stock directly owned by ACP; (iv) 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 ACPGP and (2) managing member of Adage Capital Partners LLC, a Delaware limited liability company (“ ACPLLC ”), general partner of ACM, with respect to the Common Stock directly owned by ACP; and (v) 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 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 and ACM are limited partnerships organized under the laws of the State of Delaware. ACPGP is a limited liability company organized under the laws of the State of Delaware. Messrs. Gross and Atchinson are citizens of the United States. CUSIP No. 20454B104 13G/A Page 8 of 10 Pages

(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 20454B104 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. The information required by Items 4(a) – (c) is set forth in Rows (5) – (11) of the cover page for each Reporting Person hereto and is incorporated herein by reference for each such Reporting Person. The percentage set forth in this Schedule 13G/A is calculated based upon 127,486,326 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 9, 2023. CUSIP No. 20454B104 13G/A Page 9 of 10 Pages Item 5. Not applicable. Item 6. Not applicable. Item 7.

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 MANAGEMENT, L.P. By: Adage Capital Partners LLC, its general partner /s/ Robert Atchinson Name: Robert Atchinson Title: Managing Member /s/ Robert Atchinson ROBERT ATCHINSON, individually /s/ Phillip Gross PHILLIP GROSS, individually

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View this SC 13G/A filing on SEC EDGAR