Bolt Threads is a pioneering synthetic biology company developing engineered biomaterials for fashion, textiles, and beauty industries. Founded in 2009, Bolt creates sustainable materials including Microsilk (spider silk protein) and Mylo (mycelium-based leather alternative) using fermentation-based production processes. The company leverages a proprietary protein production platform to replace animal-derived and petrochemical ingredients with biologically engineered alternatives.
Bolt Threads is publicly traded
This company is no longer available on our private secondary market. Shares can be traded publicly under its listed ticker.
Company data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Founded
2009
Total Funding
$466M
6 rounds
Latest Valuation
$0.25B
October 2023
Total raised $466M across 6 rounds
Funding data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Last updated 06-25-2026
Latest Round
Type
SPAC Merger (Bolt Projects Holdings)
Date
October 2023
Amount
Not disclosed
Valuation
$0.25B
Lead Investors
| Date | Round | Amount Raised | Valuation | Lead Investors |
|---|---|---|---|---|
| October 2023 | SPAC Merger (Bolt Projects Holdings) | Not disclosed | $0.25B | N/A |
| June 2021 | Series E | $253M | — | Not disclosed |
| January 3, 2018 | Series D | $123M | — | Baillie Gifford |
Dan Widmaier
CEO and Co-founder
David Breslauer
Chief Product Officer and Chief Technology Officer, Co-founder
Ethan Mirsky
Vice President of Operations, Co-founder
Bolt Threads completed a business combination with Golden Arrow Merger Corp (SPAC) on August 14, 2024. The combined entity is now trading on NASDAQ under ticker BSLK as Bolt Projects Holdings Inc.
Bolt Threads shares can be purchased through any standard brokerage account — including Fidelity, Charles Schwab, TD Ameritrade, and online platforms like Robinhood or E*TRADE. Search for the ticker to place an order.
Bolt Threads had a valuation of approximately $0.25B at the time of its public offering. Current market capitalization fluctuates with the share price.
Bolt Threads raised $466M across 6 disclosed funding rounds prior to its public listing.
Bolt Threads was co-founded by Dan Widmaier, David Breslauer, and Ethan Mirsky in 2009.
Bolt Threads is headquartered in Berkeley, California, USA.
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