1. Must be able to understand a written informed consent, which must be obtained prior to initiation of study procedures.

2. Must be willing and able to comply with all study requirements

3. Healthy males or non-pregnant, non-lactating healthy females with obesity or overweight.

4. For Part 1 (SAD cohorts), BMI of 25.0 to 40.0 kg/m2 as measured at screening, with no chronic health conditions.

5. For Part 2 (MAD cohorts), BMI of 30.0 to 45.0 kg/m2, as measured at screening with no chronic health conditions.

6. Have a stable body weight (less than or equal to 5% body weight gain or loss) for 3 months prior to screening.

7. HbA1c ≤ 6.5%

Medical/Surgical History and Mental Health

1. Known self or family history (first-degree relative) of medullary thyroid cancer and/or multiple endocrine neoplasia Type 2 (MEN2).

2. History of stomach or intestinal surgery or resection and/or gastroparesis (except that appendectomy and/or hernia repair will be allowed).

3. Significant history of or currently have major depressive disorder or psychiatric disorder or suicidal ideation within the last 2 years.

4. Severe uncontrolled treated or untreated hypertension (systolic blood pressure [BP] >150 mmHg or diastolic BP >90 mmHg).

5. Mean QTcF interval greater than 450 msec on triplicate ECGs.

Diagnostic Assessments

6. Clinically significant abnormal clinical chemistry, hematology, coagulation or urinalysis as judged by the investigator

7. Positive hepatitis B surface antigen (HBsAg), hepatitis C virus antibody (HCV Ab) or human immunodeficiency virus (HIV) antibody results.

8. eGFR of <60 mL/min/1.73 m2

9. AST, ALT or total bilirubin > ULN

10. Lipase and/or amylase > ULN

11. Calcitonin ≥20 ng/L

Prior Study Participation

12. Participants who have received any IMP in a clinical research study within 5 half -lives or within 30 days prior to first dose

Prior and Concomitant Medication

13. Participants who are taking, or have taken, any prescribed or over-the-counter drug or herbal remedies (other than HRT/hormonal contraception) in the 14 days before first IMP administration

14. Use of prescription or over-the-counter medications known to significantly prolong the QT or QTc interval is excluded.

15. Currently dieting (formal weight loss program) and/or are currently using or have used within 2 months of screening any drugs for weight management

16. Participants who have previously used GLP-1 receptor agonist, or GIP/GLP-1 dual receptor agonists, or any investigational medicine containing a GLP-1 and/or GIP receptor agonist in the 6 months prior to first IMP administration