United States · Series D startup
2 rounds we have observed, with the 9 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.
Funding summaryUpdated 26 Oct 2026
$34Mraised across 2 rounds since 2005, from 2 sources
Each circle is a round, placed by date and sized by amount. The line above is the running total.
ProQuest InvestmentsFrom a historical funding record
The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.
From historical deal records. Wrong? Tell us.
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Optimer Pharmaceuticals's investors include ProQuest Investments, BB Biotech Ventures, China Development Industrial Bank (CDIB), Lurie Investment Fund and SB Life Science, and 4 more on record.
Optimer Pharmaceuticals has raised $34M across 2 rounds since 2005.
Optimer Pharmaceuticals's most recent round was a Series D of $22M in Dec 2005.
Its most recent round, $22M in Dec 2005, is also its largest on record.
Optimer Pharmaceuticals's first round on record, in Mar 2005, was backed by Par Pharmaceuticals.
Optimer Pharmaceuticals's latest named round is a Series D, in Dec 2005.
Optimer Pharmaceuticals is based in the United States.
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United States · 