Gunderson Dettmer Represents Long-Time Client BillionToOne in its Upsized $273.1 Million Initial Public Offering

Rhea-AI Summary

BillionToOne (Nasdaq: BLLN) completed an upsized initial public offering of 4.6 million shares of Class A common stock at $60 per share, generating approximately $273.1 million in aggregate gross proceeds. The shares began trading on the Nasdaq Global Select Market on November 6, 2025, with the offering expected to close on November 7, 2025.

Gunderson Dettmer represented BillionToOne across multiple financings from Series A through late-stage rounds and advised on the public listing; J.P. Morgan, Piper Sandler, Jefferies and William Blair acted as joint book-running managers, with Stifel, Wells Fargo Securities and BTIG also serving as book-running managers.

Positive

• Proceeds of $273.1 million from the IPO
• Shares issued of 4.6 million at $60 per share
• Listing on Nasdaq Global Select Market on Nov 6, 2025
• Long-term legal relationship: represented from Series A through late-stage rounds

Negative

• IPO execution occurred amid the current government shutdown, introducing potential market uncertainty

Insights

Equity Capital Markets Analyst

BillionToOne completed an upsized IPO of 4.6 million shares at $60, raising about $273.1 million; listing began on Nasdaq on Nov 6, 2025.

BillionToOne sold 4.6 million Class A shares at $60 per share, producing roughly $273.1 million in gross proceeds. The shares began trading on the Nasdaq Global Select Market on Nov 6, 2025 and the offering is expected to close on Nov 7, 2025. The firm used multiple book‑running managers including J.P. Morgan, Piper Sandler, Jefferies, and William Blair.

The primary business effect is a material increase in publicly accessible capital for the company through a fully marketed equity issuance. Key dependencies include final closing of the offering on Nov 7, 2025 and successful integration as a Nasdaq‑listed public company. Watch the closing confirmation on Nov 7, 2025 and any subsequent disclosures about use of proceeds, lock‑ups, or follow‑on financings within the first quarter after listing.

REDWOOD CITY, Calif., Nov. 6, 2025 /PRNewswire/ -- Gunderson Dettmer Stough Villeneuve Franklin & Hachigian, LLP, a leading law firm in technology and life sciences transactions, represented long-time client BillionToOne, Inc. (Nasdaq: BLLN), a molecular diagnostics company on a mission to make powerful and accessible genetic tests available to all, in its upsized initial public offering of 4.6 million shares of Class A common stock at a price to the public of $60 per share, generating approximately $273.1 million in aggregate gross proceeds. The shares began trading on the Nasdaq Global Select Market on November 6, 2025, and the offering is expected to close on November 7, 2025.

Gunderson Dettmer represented BillionToOne through multiple major financing rounds, from its Series A to late-stage equity and debt private rounds. Gunderson's strategic counsel supported BillionToOne from early-stage funding to public markets entry, navigating a dynamic and complex capital markets environment including the current government shutdown.

J.P. Morgan, Piper Sandler, Jefferies and William Blair are acting as joint book-running managers for the offering. Stifel, Wells Fargo Securities and BTIG are also acting as book-running managers for the offering.

The Gunderson deal team included corporate partner Nick Harley, Public Companies/Public Offerings partners Andrew Thorpe and Alexa Belonick, Public Companies/Public Offerings associates Elena Vespoli and Michael Tiab, corporate associates Jenny Whalen-Ball and Megan Wiener, executive compensation partner Michael Richman and associate Erik Ward, and senior paralegals Scott Paraker and Doug Ikegami.

About Gunderson Dettmer

Gunderson Dettmer is the preeminent international law firm with an exclusive focus on the innovation economy. The firm serves market-leading venture capital and growth equity investors and pioneering companies through inception, growth and maturity, as well as groundbreaking public companies that result from the global venture capital ecosystem. The firm's clear-cut focus and well-honed technical skill enables an accelerated pace and unmatched efficiency, delivering best-in-class value at each phase of a client's business.

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SOURCE Gunderson Dettmer

FAQ

What were the terms of BillionToOne's (BLLN) November 6, 2025 IPO?

BillionToOne sold 4.6 million Class A shares at $60 per share, raising about $273.1 million.

When did BillionToOne (BLLN) begin trading on Nasdaq and when does the offering close?

Shares began trading on the Nasdaq Global Select Market on Nov 6, 2025, and the offering was expected to close on Nov 7, 2025.

Which banks managed BillionToOne's (BLLN) IPO syndicate?

Joint book-running managers were J.P. Morgan, Piper Sandler, Jefferies and William Blair; Stifel, Wells Fargo Securities and BTIG were also book-running managers.

How much capital did BillionToOne (BLLN) raise in its upsized IPO?

The company generated approximately $273.1 million in aggregate gross proceeds.

What role did Gunderson Dettmer play in BillionToOne's (BLLN) IPO?

Gunderson Dettmer represented BillionToOne across multiple financing rounds and provided counsel for the company's public market entry.