Inclusion Criteria

1. Participant is between 18 and 90 years of age.
2. Participant weight is 40 kg to 160 kg inclusive.
3. Participant to be randomized and infusion with investigational product initiated within 24 hours of last known normal/AIS stroke onset.
4. Participant has NIHSS ≥5 and ≤15 at approximately the time of randomization. This criterion also applies to participants who meet the following conditions:
   • The participant initially presents with an NIHSS score below 5 but clinically worsens, including cases of progressing stroke/stroke-in-evolution, resulting in a subsequent persistent NIHSS score of ≥5 and ≤15; and
   • Participant meets all other inclusion and exclusion criteria, including repeat brain imaging to rule out hemorrhagic transformation.
5. Participant had a pre-morbid mRS score of 0 to 1 (mRS score prior to AIS) as stated by participant or participant’s representative.
6. If participant has received fibrinolytic treatment for AIS within 4.5 hours of last known normal/AIS stroke onset and at least 6 hours after completing fibrinolytic treatment, and the participant meets all of the following criteria:
   • Participant’s initial NIHSS score prior to fibrinolytics was ≤15; and
   • At least six hours after fibrinolytics, the participant has NIHSS score of ≥5 and ≤15 with a persistent deficit; and
   • The participant’s NIHSS score showed less than a 4-point improvement, or worsened, after receiving fibrinolytics; and
   • Participant meets all other inclusion and exclusion criteria including repeat brain imaging to rule out hemorrhagic transformation. Hemorrhagic transformation is defined as any of the following:
     • PH1 or PH2 type hemorrhage based on Heidelberg Classification
       • Note: HI1 and HI2 type hemorrhages based on Heidelberg classification are not exclusionary.
     • Hemorrhage resulting in neurologic deterioration
7. Participant and/or legally authorized representative is able to provide informed consent.
8. Participant is willing and able to comply with the study protocol, in the Investigator’s judgment.

Exclusion Criteria

1. At screening, or with repeat imaging (see Inclusion 4 and 6), participant has imaging confirmed hemorrhage stroke.
2. Participant has image findings with symptomatic large vessel occlusion at one or more of the following locations: Intracranial carotid I/T/L or M1 segment MCA, vertebral or basilar artery (BA).
3. Participant has large core of established infarction defined as Alberta Stroke Program Early CT Score (ASPECTS) 0-5.
4. Participant has or will receive MT for their current AIS. (Diagnostic angiogram without proceeding to MT is not exclusionary).
5. Participant has suspected or confirmed extracranial arterial dissection.
6. Participant has imaging findings and symptoms consistent with a brain stem or cerebellar stroke. Posterior cerebral artery strokes without any associated brain stem or cerebellar involvement are allowable.
7. Participant has 2 consecutive recorded measurements of SBP <100 mmHg or MAP <65 mmHg; MAP = DBP + [1/3 (SBP – DBP)] after stroke symptom onset and within 6 hours prior to randomization.
8. Participant is currently prescribed angiotensin-converting enzyme inhibitor (ACEi) and is unable or unwilling to convert to another antihypertensive pharmacological treatment through Day 29 ±1 day (8 days after last treatment).
9. Participant is currently prescribed an (ACEi), and the last reported dose by the participant or their representative:
   • was taken less than 24 hours prior to the start of IV IP infusion for participants with normal or mild (CKD 1-3a [eGFR ≥ 45 mL/min/1.73 m²]), or
   • was taken less than 48 hours prior to the start of IV IP infusion for participants with significant (CKD 3b or higher [eGFR < 45 mL/min/1.73 m²])
10. Participant has a history of clinically significant allergic reactions such as angioedema or anaphylaxis requiring hospitalization.
11. Participant has a diagnosis or suspected diagnosis of hereditary angioedema (HAE) or is taking or prescribed medications commonly used as prophylaxis/treatment of HAE, such as C1-esterase inhibitors (Cinryze, Berinert, Ruconest, Haegarda), Danazol, kallikrein inhibitors (Ecallantide, Berotralstat, Lanadelumab), Bradykinin B2 Receptor Antagonists (Icatibant), or other medication designed to influence the kallikrein-kinin system.
12. Life expectancy estimated at ≤1 year prior to enrollment.
13. Participant has clinical evidence of an active infection at the time of enrollment requiring parenteral treatment or hospitalization to monitor or manage the infection.
    NOTE: Treatment of uncomplicated infections with oral antibiotics would not be an exclusion (for example, the treatment of uncomplicated urinary tract infections or sinus infections with oral antibiotics would not be exclusionary).
14. Participant has known alpha 1-antitrypsin deficiency (α1-antitrypsin deficiency).
15. Participant is pregnant or nursing.
    NOTE: Participants who agree to stop nursing may be considered for inclusion at the discretion of the Investigator.
16. Participants of child-bearing potential who do not agree to use medically acceptable contraceptive measures to prevent pregnancy. All participants of childbearing potential (defined as sexually mature participants who have had menses within the preceding 24 months and have not undergone permanent sterilization methods such as hysterectomy, bilateral oophorectomy, bilateral salpingectomy, etc.) must have a negative serum pregnancy test performed locally. Participants participating in sexual activity must agree to use, or for their partner to use, 2 highly effective birth control methods (those with a failure rate of less than 1% per year when used consistently and correctly) until they have completed the study (after the Day 90 visit). Such methods include:
    • Combined (estrogen and progesterone containing) hormonal oral, intravaginal, or transdermal contraception associated with the inhibition of ovulation
    • Progesterone-only oral, injectable, or implantable hormonal contraception associated with the inhibition of ovulation
    • Intrauterine device (IUD)
    • Intrauterine hormone-releasing system (IUS)
    • Bilateral tubal occlusion
    • Vasectomized partner
    • Sexual abstinence
17. Participant is currently participating in or has participated in a study using an investigational device or drug or received an investigational drug or investigational use of a licensed drug within 30 days prior to screening.
18. Participant does not have sufficient venous access for infusion of investigational product or blood sampling.
19. Participant is unable or unwilling to comply with protocol requirements, including assessments, tests, and follow-up visits.
20. Participant has any other medical condition (such as hemodialysis) which in the opinion of the Investigator will make participation medically unsafe or interfere with the study results.