Maternal deaths due to obstetric hemorrhage are largely preventable in the U.S., including Massachusetts. Alarmingly, Black pregnant and postpartum people who experience obstetric hemorrhage have disparate rates of severe maternal morbidity (SMM). The Perinatal-Neonatal Quality Improvement Network of Massachusetts (PNQIN) began implementation of the AIM Obstetric Hemorrhage Patient Safety Bundle in June 2021 with 21 of the state’s 40 birthing facilities. Between April 2021 and June 2022, the percentage of patients who had their blood loss measured from birth through the recovery period using quantitative and cumulative techniques increased by 33%, from 60% to 80%. During the same time, MA observed a decrease of 8.1% in SMM excluding blood transfusions among birthing people with an obstetric hemorrhage, from 6.2% to 5.7%. SMM decreased for all racial groups with the greatest decrease observed among Black patients. PNQIN continues to collect process and structure measures data for the patient safety bundle, focusing on collecting data disaggregated by race and ethnicity to assess inequities in care and disparities in outcomes.