Bolt Threads was a synthetic biology company that engineered biomaterials for the beauty, fashion and textile industries. Founded in 2009 as Refactored Materials, it used fermentation to make protein-based alternatives to animal- and petroleum-derived ingredients, including Microsilk engineered spider silk, the Mylo mycelium leather alternative and the b-silk peptide used in personal care formulations. Mylo production was halted in 2023, and the company went public in August 2024 as Bolt Projects Holdings. It was delisted from Nasdaq in early 2026, deregistered with the SEC in March 2026, and its website now states that the company is no longer operating.
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
7 rounds
Last Private Valuation
$0.25B
Oct 1, 2023
Delisted from Nasdaq (effective ~Mar 12, 2026) for equity-compliance shortfall; filed to deregister with SEC, now trades OTC Pink as BSLK.
Severely reduced liquidity/transparency; SEC deregistration ends public reporting entirely.
Funding data and valuation marks are estimates and may be incomplete, stale, erroneous, or revised.
Total raised $466M across 7 rounds
Last updated 09-25-2026
| Date | Round | Amount Raised | Valuation | Lead Investors |
|---|---|---|---|---|
| Oct 4, 2023 | Convertible Note Bridge | $27.2M | — | Not disclosed |
| Oct 2023 | SPAC Merger (Bolt Projects Holdings) | Not disclosed | $0.25B | N/A |
| Jun 2021 | Series E | $253M | — | Not disclosed |
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 listed on Nasdaq as Bolt Projects Holdings (BSLK) through its August 2024 merger with Golden Arrow Merger Corp, but Nasdaq issued a delisting determination on December 31, 2025 for failing the minimum stockholders' equity standard, suspended trading on January 5, 2026, and the common stock and warrants moved to the OTC Pink Market as BSLK and BSLKW the same day. The company did not appeal, delisted voluntarily, and filed a Form 15 on March 12, 2026 to suspend and terminate its SEC reporting obligations. Its website now states that the company is no longer operating and directs inquiries to the insolvency firm Verdolino & Lowey, P.C.; no dated wind-down announcement has been published.
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 7 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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