Subjects who completed either OBERON or TITANIA will be offered the opportunity to consent for this Multicentre, Double-blind, Randomised, Placebo controlled, Parallel Group, Phase 3, extension study to evaluate the safety and efficacy of Tozorakimab in adult participants with symptomatic COPD.

Participants who have completed the study treatment period and have not been prematurely discontinued from IP in one of the predecessor studies, OBERON or TITANIA, will be offered the opportunity to consent for this Multicentre, Double-blind, Randomised, Placebo-controlled, Parallel Group, Phase 3 extension study to evaluate the efficacy and safety of Tozorakimab versus placebo in adult (40 years and older) participants with symptomatic COPD and with a history of exacerbations

Inclusion Criteria:

1. Participants who have completed the treatment period and have not been prematurely discontinued from IP in the predecessor studies.
2. Participants who received their last dose of IP in the predecessor studies within the previous 12 weeks and were not withdrawn from the predecessor study.
3. FOCBP (female(s) of childbearing potential) must have a negative urine pregnancy test at Visit 1.
4. Participants who are willing to continue using contraceptive methods as agreed to for the predecessor OBERON or TITANIA studies.
5. Capable of giving signed informed consent.

Exclusion Criteria:

1. Any clinically significant disorder or abnormal findings (clinical, laboratory, instrumental, etc) or major physical and/or cognitive impairment - which, in the opinion of the Investigator, may put the participant at risk because of his/her participation in the study or impact the interpretation of the study results, or otherwise make the participation of the participant inappropriate.

2. Participant meeting criteria for IP discontinuation as judged by the Investigator or the Sponsor.

3. Concurrent enrolment in other interventional clinical studies or treatment with another IP, with the exception of the OBERON and TITANIA predecessor studies.

4. Known history of:

   1. Severe allergic reaction to any monoclonal and polyclonal antibody.
   2. Allergy or reaction to any component of the IP formulation.

5. Chronic use (or expected need for chronic use during the study) of immunosuppressive medications (including, but not limited to, systemic corticosteroids), marketed or investigational biologic, or another prohibited medication.

6. Involvement in the planning and/or conduct of the study (applies to both staff employed by the Sponsor and/or staff at the study site).

7. Participants who are not able to comply with the study requirements, procedures, and restrictions.

Qualified researchers can request access to anonymized individual patient-level data from AstraZeneca group of companies sponsored clinical trials via the request portal. All request will be evaluated as per the AZ disclosure commitment:

https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure. Yes, indicates that AZ are accepting requests for IPD, but this does not mean all requests will be shared.

AstraZeneca will meet or exceed data availability as per the commitments made to the EFPIA Pharma Data Sharing Principles. For details of our timelines, please rerefer to our disclosure commitment at:

https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure.

When a request has been approved AstraZeneca will provide access to the deidentified individual patient-level data in an approved sponsored tool . Signed Data Sharing Agreement (non-negotiable contract for data accessors) must be in place before accessing requested information. Additionally, all users will need to accept the terms and conditions of the SAS MSE to gain access. For additional details, please review the Disclosure Statements at https://astrazenecagrouptrials.pharmacm.com/ST/Submission/Disclosure.