A Study to Investigate the Safety, Tolerability, and Preliminary Efficacy With AION-301 Administered by Intravenous Infusion Compared With Placebo Administered by Intravenous Infusion Investigational Intervention in Participants Aged 35 to 75 Years of Age With Chronic Kidney Disease (CKD)

Inclusion Criteria: Participants are eligible to be included in the study only if all of the following criteria apply: * Patient is able to communicate well with the investigator, is capable of giving signed informed consent which includes compliance with the requirements and restrictions listed in the informed consent form (ICF) and in this protocol, understands all requirements of the study, and understands and signs the written ICF before any study-specific procedure. * Willing and able to comply with the scheduled visits and treatment plan. * Either biological sex * Participant must be 35 to 75 years of age inclusive, at the time of signing the informed consent. * Diagnosis of CKD stage 3, G3 (a and b): persistent eGFR between 30 and 59 mL/min/1.73 m² (at least 2 measures within that range in the preceding 3 months, including the one at screening visit), and persistent increased Albuminuria (at least 2 measures within 3 months, including 1 before screening and 1 at screening (criterion for increased Albuminuria at screening: ≥2 out of 3 repeat daily early morning samples at screening) (UACR ≥ 200 mg/g and \< than 5000 mg/g) * Treatment with maximum labelled or tolerated dose of a renin-angiotensin-aldosterone system (RAAS) blocking agent including an angiotensin converting enzyme (ACE) inhibitor or an angiotensin II receptor blocker (ARB), and SGLT2 inhibitors (SGLT2i) unless such treatment is contraindicated or not tolerated\*. Treatment dose must be stable for at leas…