Overview
ParcelBio is engineering a new class of mRNA medicines designed to deliver unprecedented potency and durability. Its proprietary APEXm™ platform uses novel RNA domains to enhance protein expression and extend activity, enabling therapies that reach the thresholds required for meaningful, and potentially curative, clinical outcomes. The company is advancing programs in autoimmune disease, oncology, and encoded protein therapeutics.
Founders & team
Previously Parcel Therapuetics, Parcel Therapeutics
David Weinberg
Founder/CEODavid is the co-founder and CEO of ParcelBio. He was previously VP of RNA Platform at Orbital Therapeutics / Circ Bio, where he led the development of a circular RNA therapeutics platform. Before that, he was Sr. Director of Molecular Research at Freenome, where he built the multiomics diagnostics platform that enabled a blood test for the early detection of cancer. David obtained his PhD from MIT, was a UCSF Faculty Fellow, and has been honored with Forbes ‘30 Under 30’ and an NIH DP5 Award.
Chris Carlson
FounderChris is the co-founder and CSO of ParcelBio. He was previously a scientist at Orbital Therapeutics, where he was the primary contributor on multiple patents regarding stabilization of therapeutic RNAs. Chris obtained his PhD from UCSF where he studied RNA packaging and protection in viruses.
Founded 2023 · Source ↗
Sources & observations
Y Combinator
Profile depthverified profile
Website observationwebsite reachable
Last website check2026-11-11
Location · source statedSan Francisco, CA, USA
Pricing evidenceNo pricing page confirmed
Maturity: Not assessed · 3 of 6 areas documented
Source-based assessment · automated evidence rules
The retained text does not establish product availability or customer use.
Maturity is an evidence-based assessment, not a success rating. It may understate the current stage where evidence is limited. Coverage records documented areas, not a complete or independently audited company history.
Stage definitionsindependent websitesource corroborationreachable websitedescriptive evidenceclassified market and modelsourced peoplesourced founding year
