This study is open to adults with chronic kidney disease at risk of progression. People with and without type 2 diabetes can take part in this study. The study is open to people who take other medicines called angiotensin converting enzyme inhibitors (ACEi) or angiotensin receptor blockers (ARB). People who already take empagliflozin or any other sodium-glucose cotransporter-2 inhibitor (SGLT2i) can also join. The study is also open to people who currently do not take any of these treatments. The purpose of this study is to find out whether a medicine called BI 690517 helps people with chronic kidney disease when taken in combination with a study medicine called empagliflozin. Worsening of kidney function increases the risk for kidney failure, cardiovascular disease, and heart disease.

After a run-in period, during which participants are confirmed to be receiving clinically appropriate renin-angiotensin system blockade and are established on empagliflozin, they are randomly assigned (by chance) to 1 of 2 groups. One group receives BI 690517 tablets, and the other group receives placebo tablets. Placebo tablets look like BI 690517 but do not contain any medicine. Participants take 1 study tablet once a day, in addition to empagliflozin, for the duration of the study.

The doctors document when participants experience worsening of their kidney disease, go to hospital due to heart failure, or die of cardiovascular problems during the study. The time to these events is compared between the 2 treatment groups to see whether the treatment works. The study continues until the required number of events have occurred which is about 3 to 4 years. During this time, participants visit the study site about 4 times within the first 6 months. Then they visit the study site every 6 months. At the visits, doctors regularly check participants' health, take blood and urine samples, measure blood pressure and weight, check kidney function, and take note of any unwanted effects.

Key Inclusion Criteria:

• Evidence of chronic kidney disease (CKD) at risk of kidney disease progression is defined on the basis of local laboratory results recorded at least 3 months before and at the time of the Screening visit, and requires:

  1. Chronic Kidney Disease Epidemiology Collaboration (CKD-EPI) eGFR ≥20 <45 mL/min/1.73m²; or
  2. CKD-EPI eGFR ≥45 <90 mL/min/1.73m² with urine albumin-to-creatinine ratio (uACR) ≥200 mg/g (or protein-to-creatinine ratio ≥300 mg/g).

• Neither requires an Aldosterone Synthase inhibitor (ASi) or Mineralocorticoid Receptor Antagonist (MRA), nor that such treatment is definitely inappropriate.

Key Exclusion Criteria:

• Blood potassium of >5.2 mmol/L at screening visit
• Blood Alanine Transaminase (ALT) or Aspartate Transaminase (AST) >3x Upper Limit of Normal (ULN) at Screening visit
• Known liver cirrhosis
• On dialysis, functioning kidney transplant, or scheduled living donor transplant
• Treated with new immunosuppression therapy for new (or relapse/flare of pre-existing) kidney disease within the last 60 days
• Receiving more than one Renin-Angiotensin System (RAS) inhibitor (i.e. on dual therapy with two of an Angiotensin-Converting Enzyme inhibitor (ACEi), Angiotensin Receptor Blocker (ARB) or direct renin inhibitor)
• Currently treated with an Mineralocorticoid Receptor Antagonist (MRA) (e.g. spironolactone, eplerenone, finerenone)
• Currently treated with systemic mineralocorticoid replacement therapy (e.g. fludrocortisone) Further exclusion criteria apply.

Once the criteria in section "Time Frame" are fulfilled, researchers can use the following link https://www.clinicalstudies.boehringer-ingelheim.com/msw/datasharing to request access to the clinical study documents regarding this study, and upon a signed "Document Sharing Agreement".

Furthermore, researchers can request access to the clinical study data, for this and other listed studies, after the submission of a research proposal and according to the terms outlined in the website.

One year after the approval has been granted by major Regulatory Authorities and after the primary manuscript has been accepted for publication, or after termination of the development program.

For study documents - upon signing of a 'Document Sharing Agreement'. For study data - 1. after the submission and approval of the research proposal (checks will be performed by the sponsor and/or the independent review panel, including checking that the planned analysis does not compete with sponsor's publication plan); 2. and upon signing of a legal agreement.