Soligenix (SNGX) stock closed the regular session Tuesday up 31.5% at $0.51, then surged another 72% in after-hours trading before spiking more than 110% in pre-market Wednesday. The stock is on pace to reclaim the $1 level for the first time in a month.
The move came after Soligenix announced its ThermoVax platform could be used to quickly develop a thermostable vaccine for Bundibugyo virus — one of the strains behind the current Ebola outbreak in the Democratic Republic of Congo.
The DRC outbreak has recorded over 900 suspected infections and 223 suspected deaths as of May 2026. The World Health Organization classified the situation as a public health emergency of international concern earlier this month.
$SNGX < $.50c – Soligenix
Suitability of Vaccine Platform for Bundibugyo Virus, Cause of the Ebola Outbreak in Congo
— John Zidar aka/ Stock Wizard (@JohnZidar) May 26, 2026
Two confirmed cases have already spread into neighboring Uganda, with WHO’s Africa regional director warning of cross-border transmission risk.
Soligenix developed its vaccine formulations in partnership with the University of Hawaii. Professor Axel Lehrer, who collaborated on the project, said the vaccines showed 100% protection in non-human primate studies.
The vaccines can be stored for at least two years at 40°C (104°F), which is a practical advantage for distribution in endemic regions where cold-chain infrastructure is limited.
Lehrer added: “A single-vial subunit vaccine that can be shipped at ambient temperatures and then needs to only be reconstituted with sterile water immediately prior to use has the potential to improve vaccination efforts globally.”
There are currently no approved vaccines for Bundibugyo virus, Sudan virus, or Marburg virus. That gap is central to the market’s reaction to Soligenix’s announcement.
Soligenix CEO Christopher J. Schaber said the ThermoVax platform has already successfully stabilized vaccines for ricin toxin, Ebola, Sudan, Marburg, and COVID. The company says the platform can induce broad immune coverage and compete with technologies that require cold-chain storage.
Soligenix also holds FDA Orphan Drug Designations for Sudan and Marburg viruses. Those designations come with seven-year market exclusivity, eligibility for federal grants to fund clinical trials, and a waiver of FDA user fees on Biologics License Application submission.
Retail sentiment on Stocktwits flipped to “extremely bullish” from “bullish” within 24 hours, and chatter volume on the stock jumped roughly 14,000% over a seven-day period.
Short interest in SNGX is currently at a six-month high according to Koyfin data, raising the possibility that part of the price action reflects a short squeeze.
SNGX is also approaching the 100-day moving average, a technical level it has not traded above in a month. Resistance has been flagged by retail traders in the $1.13–$1.15 range.
The stock has a market cap of approximately $7.61 million and a 52-week range of $0.28 to $6.23. Over the past 12 months, SNGX has dropped 73%.
The CDC has called for tighter screening of travelers arriving from affected DRC and Uganda regions, keeping the outbreak in the news cycle.
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