Ambiq Micro, Inc. (NYSE: AMBQ), a maker of ultra-low-power semiconductors for edge artificial-intelligence (AI) workloads, filed a Form S-1 registration statement with the U.S. Securities and Exchange Commission on June 22, 2026, registering a follow-on equity offering. The preliminary prospectus states the company is offering 1,800,000 shares of common stock, par value $0.000001 per share, with the underwriters holding an option to purchase up to 270,000 additional shares. Based on an assumed public offering price of $90.48 per share — the last reported sale price of AMBQ on the New York Stock Exchange on June 18, 2026 — the company estimates net proceeds of approximately $152.3 million, or about $175.2 million if the underwriters exercise their option in full.

The offering is a follow-on: Ambiq's common stock already trades on the NYSE under the symbol AMBQ, and the S-1 registers additional shares for sale by the company. The prospectus states that 23,159,204 shares will be outstanding after the offering (23,429,204 if the option is exercised in full). At the assumed $90.48 price, the 1,800,000 base shares correspond to roughly $162.9 million in gross proceeds before underwriting discounts, commissions, and offering expenses; the company's $152.3 million net-proceeds estimate reflects those deductions. The accompanying Calculation of Filing Fee exhibit registers a larger figure — 2,070,000 shares (the base shares plus the 270,000-share underwriter option) at a maximum aggregate offering price of $169,077,600 — a number the filing states was computed for fee purposes using the average of the high and low NYSE prices on June 17, 2026, $81.68 per share. The S-1 states the company intends to use the net proceeds primarily for general corporate purposes, including working capital, sales and marketing, product development, general and administrative matters, and capital expenditures, and that it does not currently have specific or preliminary plans for the proceeds beyond those categories.

What the filing says Ambiq makes

The prospectus describes Ambiq as a designer of low-power chips aimed at running AI computation at the edge — on battery- and wireline-powered devices such as consumer wearables, digital health devices, and industrial, smart-home, and building endpoints — rather than in the data center. In the filing's own words, the company frames its position this way:

"We are a pioneer and leading provider of ultra-low power semiconductor solutions designed to address the significant power consumption challenges of general purpose and AI compute – especially at the edge."— Ambiq Micro Form S-1, source

The S-1 centers Ambiq's technology on a proprietary platform it calls Sub-threshold Power Optimized Technology (SPOT). The filing states that, depending on the application, devices incorporating SPOT demonstrate a two-to-five-times reduction in power consumption compared with conventional integrated-circuit designs, and that SPOT lets Ambiq manufacture at more cost-effective, mature process nodes rather than chasing the most advanced nodes. The company says it has partnered since its founding with Taiwan Semiconductor Manufacturing Company Limited (TSMC) for its system-on-chip products across 180-nanometer, 90-nanometer, 40-nanometer, 22-nanometer, and 12-nanometer process nodes, leveraging mature fabrication processes the filing characterizes as more cost-effective than leading-edge nodes. The prospectus describes two flagship SoC product families: the Apollo line, which pairs peripheral sets with host processors capable of software-based or vector-accelerated AI computation. The filing also notes the company's framing that reliance on advanced process nodes and Moore's Law to solve the power problem is, in its words, "particularly limiting as Moore's Law is viewed by many as dead or broken."

The financials disclosed in the registration statement

The S-1 discloses recent operating results that frame the offering. For the three months ended March 31, 2026, Ambiq states it generated net sales of $25.1 million, up from $15.7 million in the same period of 2025. For the full years ended December 31, 2025 and 2024, the company reported net sales of $72.5 million and $76.1 million, respectively — a year-over-year decline at the annual level even as the most recent quarter showed sequential and year-over-year growth. The filing lists among its risk factors that the company has a history of net losses and may not achieve or maintain profitability, and that it depends on a limited number of end customers for most of its revenue, such that the loss of, or a significant reduction in orders from, key end customers could significantly reduce revenue. The prospectus discloses that Ambiq is increasingly focused on end customers in the United States, Europe, and Asia excluding Mainland China, and breaks out customer- and geographic-concentration data in its notes.

The registration statement identifies Ambiq as an "emerging growth company" under the federal securities laws, a status the filing says continues until the earliest of several dates — including December 31, 2030, or the fiscal year in which total annual gross revenue reaches at least $1.235 billion, or the date the company becomes a large accelerated filer. The S-1 also notes the company's founding history, stating that Scott Hanson, Ph.D., founded Ambiq and has served as Chief Technology Officer since February 2013, after serving as Chief Executive Officer from January 2010 to January 2013, and as a director since January 2010.

What the document does and does not settle

The Monday filing is a preliminary prospectus marked "Subject to Completion," meaning the final share count and offering price are not yet fixed; the $90.48 figure is an assumed price tied to the June 18 close, and the net-proceeds estimate scales with whatever final price is set when the offering prices. The filing discloses the over-allotment mechanics (270,000 additional shares), the post-offering share counts, and the categories of intended use, but it does not specify allocations among those categories or name a closing date. For the broader semiconductor business picture, the disclosures of note are the quarter-over-quarter revenue acceleration into early 2026, the full-year revenue decline from 2024 to 2025, the customer-concentration and net-loss risk-factor language, and the company's stated dependence on TSMC's mature nodes rather than leading-edge logic — a positioning the filing argues is central to its low-power approach. Where a value is not disclosed in the document, it is left open by the filing itself.