Ambiq Micro
AMBQ on NYSE. Semiconductors & related devices. Market value $1.6bn.
Price checks use the past 12 months to June 2026. Some use the latest annual report instead, as marked. Quality checks use five annual reports, the latest for the year to December 2025.
Cash flow or capital spending isn't reported, so free cash flow is unknown.
Should I look at this?
Not a fit for our list right now
Why it could be worth it
What to watch out for
See Technology stocks that passed both tests
This is not advice. Check the numbers below.
We could not compute this from the filings.
The filings do not give us enough to work this out.
The filings do not give us enough to work this out.
Quality score: not known. Price score: 16 of 100. Our list needs 70 on quality and 60 on price.
$63.24 a share, 186% above its 1-year low
Over the past year the price has ranged from $22.12 to $91.61.
Pays no dividend
Prices from Tuesday’s close (6 October).
Five years of cash, in billions
| Revenue | |
| Revenue | $73m |
| Operating margin | |
| Operating margin | -54.5% |
| Debt to equity | |
| Debt to equity | 0.00 |
| Shares outstanding | |
| Shares outstanding | 0.02bn |
Health checks
- Free cash flow positiveNot enough data
- Accounting looks honest (Beneish)Not enough data
- Financial strength (Piotroski)Not enough data
- Profit backed by cash (accruals)Not enough data
- Debt0.00× equity
- Revenue growth, five yearsUnknown
- Buying back its own sharesRoughly flat
The quarter to June 2026
How the business did, compared with the same quarter a year earlier.
- Sales: $34 million last quarter, up 90% on a year ago.
- A loss of $7 million, compared with a loss of $8 million a year ago.
- 4734% more shares than a year ago. Each share owns a bit less of the company.
- It has $367 million more cash than debt, up from $48 million a year ago.
| Quarter to | Amount |
|---|---|
| June 2025 | $18m |
| September 2025 | $18m |
| December 2025 | $21m |
| March 2026 | $25m |
| June 2026 | $34m |
| Quarter to | Amount |
|---|---|
| June 2025 | -$8m |
| September 2025 | -$9m |
| December 2025 | -$11m |
| March 2026 | -$10m |
| June 2026 | -$7m |
From the company's quarterly reports to the SEC.
Dates
- Next results (estimated)
- n/a
- Last annual report (10-K)
- 5 March 2026
- Next quarterly (estimated, 10-Q)
- 10 November 2026
Who owns it
1 long-term investor we follow owns it, unchanged from 1 last quarter. 185 funds in all.
| Fund | Value | Share of that fund | Change |
|---|---|---|---|
| First Eagle Investment ManagementMatthew McLennan | $43m | <0.1% | Added |
Largest holders overall
- BlackRock$122mAdded
- T. Rowe Price Investment Management$89mCut
- D. E. Shaw$87mNew
- Atreides Management, LP$77m
- State Street$76mAdded
- Vanguard Capital Management$68mAdded
- TWO Sigma Investments, LP$58mAdded
- First Eagle Investment Management$43mAdded
- Goldman Sachs Group$39mAdded
- Geode Capital Management$30mAdded
From 13F filings for the quarter ended 30 June 2026.
Big holders and activists
2 investors own more than 5%.
- KPCB XVI Associates, LLCPassive investorat least 8.2%(filed with 5 related holders)Since 30 September 2025
- BlackRock, Inc.Passive investor5.3%Since 30 June 2026
- T. Rowe Price Investment Management, Inc.Passive investorSold down below 5%Since 30 June 2026
| Holder | Stake | Since | |
|---|---|---|---|
KPCB XVI Associates, LLC Passive investor | at least 8.2% (filed with 5 related holders) | 30 September 2025 | |
BlackRock, Inc. Passive investor | 5.3% | 30 June 2026 | |
T. Rowe Price Investment Management, Inc. Passive investor | Sold down below 5% | 30 June 2026 |
From Schedule 13D and 13G filings: anyone owning more than 5% must file one.
What insiders did
No insider bought shares on the open market in the last 12 months. 8 sold $38m, $15m of it under preset trading plans.
- Chen Sean ChihhsiangPresident and COOSoldunder a preset trading plan
- Date
- 5 October 2026
- Shares
- 8,205
- Price
- $66.78
- Value
- $547,950
- Chen Sean ChihhsiangPresident and COOSoldunder a preset trading plan
- Date
- 2 October 2026
- Shares
- 5,802
- Price
- $69.60
- Value
- $403,794
- Esaka FumihideChief Executive Officer, DirectorSold
- Date
- 2 October 2026
- Shares
- 16,560
- Price
- $69.60
- Value
- $1m
- Hanson Scott McLeanChief Technology Officer, DirectorSold
- Date
- 2 October 2026
- Shares
- 8,680
- Price
- $69.60
- Value
- $604,091
- Winzeler Jeffrey GChief Financial OfficerSold
- Date
- 2 October 2026
- Shares
- 5,455
- Price
- $69.60
- Value
- $379,645
- Hanson Scott McLeanChief Technology Officer, DirectorSoldunder a preset trading plan
- Date
- 15 September 2026
- Shares
- 7,000
- Price
- $60.28
- Value
- $421,942
- Esaka FumihideChief Executive Officer, DirectorSoldunder a preset trading plan
- Date
- 15 September 2026
- Shares
- 13,500
- Price
- $60.28
- Value
- $813,715
- Chen Sean ChihhsiangPresident and COOSoldunder a preset trading plan
- Date
- 14 September 2026
- Shares
- 15,000
- Price
- $60.14
- Value
- $902,130
- Esaka FumihideChief Executive Officer, DirectorSoldunder a preset trading plan
- Date
- 11 September 2026
- Shares
- 50,000
- Price
- $63.36
- Value
- $3m
- ZHANG KERDirectorSold
- Date
- 11 September 2026
- Shares
- 10,000
- Price
- $63.44
- Value
- $634,361
| Date | Who | Did | Shares | Price | Value |
|---|---|---|---|---|---|
| 5 October 2026 | Chen Sean Chihhsiang President and COO | Sold under a preset trading plan | 8,205 | $66.78 | $547,950 |
| 2 October 2026 | Chen Sean Chihhsiang President and COO | Sold under a preset trading plan | 5,802 | $69.60 | $403,794 |
| 2 October 2026 | Esaka Fumihide Chief Executive Officer, Director | Sold | 16,560 | $69.60 | $1m |
| 2 October 2026 | Hanson Scott McLean Chief Technology Officer, Director | Sold | 8,680 | $69.60 | $604,091 |
| 2 October 2026 | Winzeler Jeffrey G Chief Financial Officer | Sold | 5,455 | $69.60 | $379,645 |
| 15 September 2026 | Hanson Scott McLean Chief Technology Officer, Director | Sold under a preset trading plan | 7,000 | $60.28 | $421,942 |
| 15 September 2026 | Esaka Fumihide Chief Executive Officer, Director | Sold under a preset trading plan | 13,500 | $60.28 | $813,715 |
| 14 September 2026 | Chen Sean Chihhsiang President and COO | Sold under a preset trading plan | 15,000 | $60.14 | $902,130 |
| 11 September 2026 | Esaka Fumihide Chief Executive Officer, Director | Sold under a preset trading plan | 50,000 | $63.36 | $3m |
| 11 September 2026 | ZHANG KER Director | Sold | 10,000 | $63.44 | $634,361 |
From Form 4 filings: insiders must report trades in their own company's shares within two days.
Warning signs in its filings
Problems the company itself reported to the SEC, in its own words.
None of the serious warning signs we check for were found. 1 thing worth knowing.
We look for five warning signs: doubt it can keep going, weak checks on its own accounts, a notice that its past accounts can't be relied on, a change of auditor, and one customer bringing in a big share of sales. We don't check lawsuits, investigations or debt yet.
We checked the auditor's report, internal controls, restatement notices, auditor changes and big customers in the 10-K filed 5 Mar 2026, plus the 10-Q filed 11 Aug 2026 and 4 later 8-Ks.
One big customer
Worth knowingOne customer brings in a big share of sales: 35.6% last year. Losing that customer would hurt.
“Our largest end customer historically has accounted for a large portion of our sales, representing approximately 35.6% and 40.9% of our net sales for the years ended December 31, 2025 and 2024 respectively.”
From the 10-K filed 5 March 2026, Item 1A. Risk Factors. Read it in the filing
A 10-K is the yearly report every US company files with the SEC. An 8-K is a short notice of a big event.
What could go wrong
Cheap for a reason is the question the numbers cannot answer.
Whether the price already reflects the risks is what the deep dive is for.
The deep dive
Everything above is arithmetic on public filings. The deep dive reads the last ten years of annual reports, the proxy statements, and the earnings calls, then argues the case the way Buffett, Klarman, and Hohn would, and checks every claim against the source.
- What the business is worth, as a range, and the margin of safety at today’s price
- Prices to start buying, buy, and buy hard
- The three things that would make this a mistake
- Every number footnoted to the filing it came from
Your first deep dive is free.
Not advice. Numbers on this page come from SEC filings and are updated each night; prices are updated again after the US market closes. The five-year figures are rounded.