AMBQ · CIK 0001500412
What Ambiq Micro, Inc. told the SEC could break it.
Ambiq is concentrated at both ends of its chip business. Its revenue rests on a handful of end customers — three made up 40.9%, 21.4% and 14.3% of net sales in 2024 (about 77% combined) — so losing a key one would materially cut revenue. Its supply is just as concentrated geographically: all of its wafers come from TSMC in Taiwan, with assembly and test by subcontractors elsewhere in Asia, exposing it directly to Taiwan–China geopolitical developments. That entirely Asia-based supply chain also sits in the path of semiconductor trade policy, including proposed 100% U.S. tariffs on imported semiconductors and U.S./China/Taiwan export-control and sanctions risk.
3 self-disclosed vulnerabilities, pulled from its own filings, each in the company’s words, with the source. This is the risk register almost nobody reads.
In its own words
What could break it.
Customer concentration
- Small number of end customers (top three ~77% in 2024)high
Revenue depends on a limited number of end customers; three end customers represented 40.9%, 21.4% and 14.3% of net sales in 2024 (two of them recurring in 2025), so loss of a key customer would materially reduce revenue.
“Three end customers, two of which were the same customers in 2025, represented 40.9 % , 21.4 % , and 14.3 % , respectively, of total net sales for the year ended December 31, 2024.”
SEC filing →As of 2026
Geographic concentration
- All wafers sourced from Taiwan (TSMC); assembly/test in Asiahigh
All wafer supply comes from TSMC in Taiwan, and products are assembled/tested by subcontractors in Asia, exposing supply to Taiwan/China geopolitical risk.
“because we source all of our wafers from TSMC, located in Taiwan, our supply of wafers and other critical components may be materially and adversely affected by diplomatic, geopolitical and other developments affecting the relationship between Mainland China and Taiwan”
Regulatory & policy
- Proposed 100% U.S. tariffs on imported semiconductors; export controlshigh
Faces semiconductor trade-policy risk — proposed 100% U.S. tariffs on imported semiconductors and U.S./China/Taiwan export-control and sanctions exposure — given its entirely Asia-based supply chain.
“Ongoing tariff, trade restrictions and macroeconomic uncertainty, including proposed 100% tariffs on imported semiconductors by the United States, may contribute to volatility in the price of our common stock.”
The hidden graph
Who it depends on, and who depends on it.
Relationships surfaced from filings, including ones disclosed by the other side, which is how the non-obvious ones come to light.
Its suppliers
Taiwan Semiconductor Manufacturing Company (TSMC)
“Additionally, we source all of our wafers from TSMC, located in Taiwan.”
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