Background: Biosimilar medications have increasingly gained regulatory approvals in recent years. Numerous conditions in the fields of hematology, oncology, rheumatology, and endocrinology have a biosimilar treatment option available. Some biosimilar agents can be obtained at a significantly lower cost than reference medications. Methods: Intermountain Healthcare Oncology Pharmacy and Therapeutics (P&T) committee manages and maintains the formulary of accepted drugs. The committee consists of pharmacists, medical oncologists and oncology nurses. Biosimilar medications were approved in place of reference medications for the following: pegfilgrastim, bevacizumab, trastuzumab, and rituximab. Results: Annually, we administer about 6,450 combined doses of pegfilgastrim, bevacizumab, trastuzumab, and rituximab. Assuming 70% conversion from the reference medication to biosimilar agent, transitioning from the above listed reference medications to biosimilar would save an estimated $6.3 million annually (Table). This includes a $1.75 million savings from transitioning to rituximab alone. In addition, transitioning trastuzumab from a single dose vial to multi-dose vials is estimated to save an addition $730,000. Conclusions: Biosimilar agents can reduce the cost of oncology care to patients treated at our institution. We are utilizing biosimilar agents as part of our ongoing mission to decrease the financial toxicity of treatment for patients with cancer.