Inclusion Criteria:

Laboratory-confirmed SARS-CoV-2 infection as determined by an approved polymerase chain reaction (PCR) or an approved antigen test of any specimen (can be documented from inpatient medical record)
Hospitalized with at least “severe” COVID-19-induced ARD or ARDS as defined per FDA Guidance; COVID-19: Developing Drugs and Biological Products for Treatment or Prevention
Requires oxygen supplementation at Screening
Willing to follow contraception guidelines

Exclusion

Exclusion Criteria:

Current standard of care treatments for COVID-19 appear to be working and the subject is clinically improving
Has severe ARDS with a PaO2/FiO2 (PF ratio) ≤ 100 mmHg or SpO2/FiO2 ratio < 150 mmHg with PEEP ≥ 5cm H2O A previous stem cell infusion unrelated to this trial Pregnant or breast feeding or planning for either during the study Suspected uncontrolled active bacterial, fungal, viral, or other infection (aside from infection with COVID-19) History of a splenectomy, lung transplant or lung lobectomy Concurrent participation in another clinical trial involving therapeutic interventions (observational study participation is acceptable) Expected survival or time to withdrawal of life-sustaining treatments expected to be < 7 days Has an existing "Do Not Intubate" order Has undergone home mechanical ventilation (noninvasive ventilation or via tracheotomy) except for continuous positive airway pressure or bi-level positive airway pressure (CPAP/BIPAP) used solely for sleep-disordered breathing (eg, obstructive sleep apnea) Has any significant medical condition, laboratory abnormality or psychiatric illness that in the investigator's opinion would interfere or prevent the subject from safely participating in the study