AMBQ SEC Filing News — Ambiq Micro, Inc.

Latest SEC filings for Ambiq Micro, Inc. (AMBQ) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-10-16.

Ambiq Micro, Inc. provides ultra-low-power semiconductor solutions in the United States, Europe, Asia, and internationally. It develops sub-threshold power-optimized technology (SPOT) platform which is designed to reduce power consumption of battery- and wireline-powered devices alike. The company's flagship products include Apollo family of products which pair rich peripheral sets with host processors capable of software-based AI computations or vector-accelerated AI computations; and Atomiq, t…
Sector: Technology Industry: Semiconductors Market Cap: $1.2B
20
Total Filings
0
Bullish Classifications
13
Bearish Classifications
13
Insider Transactions
0
Material Events (8-K)
0
Periodic Reports
Rule-based classifications for AMBQ currently lean bearish. Of the 20 filing records displayed, 13 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 0 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.
AMBQ Filing Activity Snapshot 2026-09-09 — 2026-10-16
Insider Transactions (Form 4)
0 buys vs 13 sells
Net insider selling in this period — insiders sell for many reasons beyond conviction.
Largest Form 144 Filing
$3.98M
Esaka Fumihide (Director, Chief Executive Officer) · 2026-09-15
63,500 shares · Form 4
Form 144 Notices
7
Proposed insider sales filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.
Insider Transactions 13 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 13 filings in this group are Form 4s for Ambiq Micro, Inc.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 13 insider filings shown, the breakdown is 13 open-market sale. 13 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Open-market sale ×13
The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.
Form 4 Open-market sale Insider Selling 2026-10-16

AMBQ insider Hanson Scott McLean (Director, Chief Technology Officer) sold 7,000 shares (~$357.0K)

Hanson Scott McLean, listed as Director, Chief Technology Officer at Ambiq Micro, Inc., reported an open-market sale of 7,000 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 7,000 $8.12 $56.8K
S Open-market sale 600 $49.06 $29.4K
S Open-market sale 900 $50.08 $45.1K
S Open-market sale 3,700 $51.12 $189.1K
S Open-market sale 1,800 $51.86 $93.4K
M Option exercise derivative · Stock Option (Right to Buy) 7,000 — —
Filing: Form 4 (Insider Transaction) Insider: Hanson Scott McLean (Director, Chief Technology Officer) Shares: 7,000 Est. Value: $357.0K
Form 4 Open-market sale Insider Selling 2026-10-16

AMBQ insider Esaka Fumihide (Director, Chief Executive Officer) sold 5,000 shares (~$255.0K)

Esaka Fumihide, listed as Director, Chief Executive Officer at Ambiq Micro, Inc., reported an open-market sale of 5,000 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 5,000 $8.12 $40.6K
S Open-market sale 500 $49.13 $24.6K
S Open-market sale 500 $50.02 $25.0K
S Open-market sale 2,800 $51.15 $143.2K
S Open-market sale 1,200 $51.85 $62.2K
M Option exercise derivative · Stock Option (Right to Buy) 5,000 — —
Filing: Form 4 (Insider Transaction) Insider: Esaka Fumihide (Director, Chief Executive Officer) Shares: 5,000 Est. Value: $255.0K
Form 4 Open-market sale Insider Selling 2026-10-16

AMBQ insider Chen Sean Chihhsiang (President and COO) sold 15,000 shares (~$772.4K)

Chen Sean Chihhsiang, listed as President and COO at Ambiq Micro, Inc., reported an open-market sale of 15,000 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 15,000 $8.12 $121.8K
S Open-market sale 7,539 $50.13 $377.9K
S Open-market sale 1,261 $51.53 $65.0K
S Open-market sale 2,000 $52.47 $104.9K
S Open-market sale 4,000 $53.44 $213.7K
S Open-market sale 200 $54.27 $10.9K
M Option exercise derivative · Stock Option (Right to Buy) 15,000 — —
Filing: Form 4 (Insider Transaction) Insider: Chen Sean Chihhsiang (President and COO) Shares: 15,000 Est. Value: $772.4K
Form 4 Open-market sale Insider Selling 2026-10-06

AMBQ insider Winzeler Jeffrey G (Chief Financial Officer) sold 5,455 shares (~$379.6K)

Winzeler Jeffrey G, listed as Chief Financial Officer at Ambiq Micro, Inc., reported an open-market sale of 5,455 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 2,343 $69.11 $161.9K
S Open-market sale 2,828 $69.77 $197.3K
S Open-market sale 284 $71.86 $20.4K
Filing: Form 4 (Insider Transaction) Insider: Winzeler Jeffrey G (Chief Financial Officer) Shares: 5,455 Est. Value: $379.6K
Form 4 Open-market sale Insider Selling 2026-10-06

AMBQ insider Esaka Fumihide (Director, Chief Executive Officer) sold 16,560 shares (~$1.15M)

Esaka Fumihide, listed as Director, Chief Executive Officer at Ambiq Micro, Inc., reported an open-market sale of 16,560 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 7,113 $69.11 $491.6K
S Open-market sale 8,585 $69.77 $599.0K
S Open-market sale 862 $71.86 $61.9K
Filing: Form 4 (Insider Transaction) Insider: Esaka Fumihide (Director, Chief Executive Officer) Shares: 16,560 Est. Value: $1.15M
Form 4 Open-market sale Insider Selling 2026-10-06

AMBQ insider Hanson Scott McLean (Director, Chief Technology Officer) sold 8,680 shares (~$604.1K)

Hanson Scott McLean, listed as Director, Chief Technology Officer at Ambiq Micro, Inc., reported an open-market sale of 8,680 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 3,728 $69.11 $257.6K
S Open-market sale 4,500 $69.77 $314.0K
S Open-market sale 452 $71.86 $32.5K
Filing: Form 4 (Insider Transaction) Insider: Hanson Scott McLean (Director, Chief Technology Officer) Shares: 8,680 Est. Value: $604.1K
Form 4 Open-market sale Insider Selling 2026-10-06

AMBQ insider Chen Sean Chihhsiang (President and COO) sold 14,007 shares (~$951.7K)

Chen Sean Chihhsiang, listed as President and COO at Ambiq Micro, Inc., reported an open-market sale of 14,007 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 2,492 $69.11 $172.2K
S Open-market sale 3,008 $69.77 $209.9K
S Open-market sale 302 $71.86 $21.7K
S Open-market sale 5,508 $66.38 $365.6K
S Open-market sale 1,797 $67.29 $120.9K
S Open-market sale 800 $68.08 $54.5K
S Open-market sale 100 $69.51 $7.0K
Filing: Form 4 (Insider Transaction) Insider: Chen Sean Chihhsiang (President and COO) Shares: 14,007 Est. Value: $951.7K
Form 4 Open-market sale Insider Selling 2026-09-17

AMBQ insider Hanson Scott McLean (Director, Chief Technology Officer) sold 7,000 shares (~$421.9K)

Hanson Scott McLean, listed as Director, Chief Technology Officer at Ambiq Micro, Inc., reported an open-market sale of 7,000 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 7,000 $8.12 $56.8K
S Open-market sale 1,953 $59.53 $116.3K
S Open-market sale 4,947 $60.56 $299.6K
S Open-market sale 100 $61.00 $6.1K
M Option exercise derivative · Stock Option (Right to Buy) 7,000 — —
Filing: Form 4 (Insider Transaction) Insider: Hanson Scott McLean (Director, Chief Technology Officer) Shares: 7,000 Est. Value: $421.9K
Form 4 Open-market sale Insider Selling 2026-09-15

AMBQ insider ZHANG KER (Director) sold 10,000 shares (~$634.4K)

ZHANG KER, listed as Director at Ambiq Micro, Inc., reported an open-market sale of 10,000 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
S Open-market sale 9,100 $63.39 $576.8K
S Open-market sale 900 $63.95 $57.6K
Filing: Form 4 (Insider Transaction) Insider: ZHANG KER (Director) Shares: 10,000 Est. Value: $634.4K
Form 4 Open-market sale Insider Selling 2026-09-15

AMBQ insider Chen Sean Chihhsiang (President and COO) sold 15,000 shares (~$902.1K)

Chen Sean Chihhsiang, listed as President and COO at Ambiq Micro, Inc., reported an open-market sale of 15,000 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 15,000 $8.12 $121.8K
S Open-market sale 2,600 $59.36 $154.3K
S Open-market sale 11,000 $60.24 $662.6K
S Open-market sale 1,400 $60.83 $85.2K
M Option exercise derivative · Stock Option (Right to Buy) 15,000 — —
Filing: Form 4 (Insider Transaction) Insider: Chen Sean Chihhsiang (President and COO) Shares: 15,000 Est. Value: $902.1K
Form 4 Open-market sale Insider Selling 2026-09-15

AMBQ insider Esaka Fumihide (Director, Chief Executive Officer) sold 63,500 shares (~$3.98M)

Esaka Fumihide, listed as Director, Chief Executive Officer at Ambiq Micro, Inc., reported an open-market sale of 63,500 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 50,000 $12.60 $630.0K
S Open-market sale 42,083 $63.27 $2.66M
S Open-market sale 7,917 $63.86 $505.6K
M Option exercise 13,500 $8.12 $109.6K
S Open-market sale 3,785 $59.56 $225.4K
S Open-market sale 9,615 $60.55 $582.2K
S Open-market sale 100 $61.00 $6.1K
M Option exercise derivative · Stock Option (Right to Buy) 19,007 — —
M Option exercise derivative · Stock Option (Right to Buy) 30,993 — —
M Option exercise derivative · Stock Option (Right to Buy) 13,500 — —
Filing: Form 4 (Insider Transaction) Insider: Esaka Fumihide (Director, Chief Executive Officer) Shares: 63,500 Est. Value: $3.98M
Form 4 Open-market sale Insider Selling 2026-09-09

AMBQ insider Chen Sean Chihhsiang (President and COO) sold 15,000 shares (~$857.6K)

Chen Sean Chihhsiang, listed as President and COO at Ambiq Micro, Inc., reported an open-market sale of 15,000 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 15,000 $8.12 $121.8K
S Open-market sale 12,874 $57.09 $734.9K
S Open-market sale 2,126 $57.68 $122.6K
M Option exercise derivative · Stock Option (Right to Buy) 15,000 — —
Filing: Form 4 (Insider Transaction) Insider: Chen Sean Chihhsiang (President and COO) Shares: 15,000 Est. Value: $857.6K
Form 4 Open-market sale Insider Selling 2026-09-09

AMBQ insider ZHANG KER (Director) sold 185 shares (~$10.5K)

ZHANG KER, listed as Director at Ambiq Micro, Inc., reported an open-market sale of 185 AMBQ shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code Nature Shares Price Value
M Option exercise 1,785 $5.88 $10.5K
S Open-market sale 185 $56.92 $10.5K
M Option exercise derivative · Stock Option (Right to Buy) 1,785 — —
Filing: Form 4 (Insider Transaction) Insider: ZHANG KER (Director) Shares: 185 Est. Value: $10.5K
Proposed Insider Sales 7 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. Ambiq Micro, Inc. has 7 such notices in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2026-10-05

AMBQ Form 144 filed for proposed insider sale by SEAN CHEN (53,205 shares) ~$3.63M

SEAN CHEN filed a Form 144 with the SEC indicating intent to sell AMBQ (Ambiq Micro, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: SEAN CHEN Shares: 53,205 Est. Value: $3.63M
Form 144 Proposed Insider Sale 2026-10-02

AMBQ Form 144 filed for proposed insider sale by Jeffrey G. Winzeler (5,455 shares) ~$377.2K

Jeffrey G. Winzeler filed a Form 144 with the SEC indicating intent to sell AMBQ (Ambiq Micro, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Jeffrey G. Winzeler Shares: 5,455 Est. Value: $377.2K
Form 144 Proposed Insider Sale 2026-10-02

AMBQ Form 144 filed for proposed insider sale by Scott McLean Hanson (8,680 shares) ~$600.2K

Scott McLean Hanson filed a Form 144 with the SEC indicating intent to sell AMBQ (Ambiq Micro, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Scott McLean Hanson Shares: 8,680 Est. Value: $600.2K
Form 144 Proposed Insider Sale 2026-10-02

AMBQ Form 144 filed for proposed insider sale by Fumihide Esaka (16,560 shares) ~$1.15M

Fumihide Esaka filed a Form 144 with the SEC indicating intent to sell AMBQ (Ambiq Micro, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Fumihide Esaka Shares: 16,560 Est. Value: $1.15M
Form 144 Proposed Insider Sale 2026-10-02

AMBQ Form 144 filed for proposed insider sale by Sean Chihhsiang Chen (5,802 shares) ~$401.2K

Sean Chihhsiang Chen filed a Form 144 with the SEC indicating intent to sell AMBQ (Ambiq Micro, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Sean Chihhsiang Chen Shares: 5,802 Est. Value: $401.2K
Form 144 Proposed Insider Sale 2026-09-11

AMBQ Form 144 filed for proposed insider sale by KER ZHANG (10,000 shares) ~$634.4K

KER ZHANG filed a Form 144 with the SEC indicating intent to sell AMBQ (Ambiq Micro, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: KER ZHANG Shares: 10,000 Est. Value: $634.4K
Form 144 Proposed Insider Sale 2026-09-11

AMBQ Form 144 filed for proposed insider sale by FUMIHIDE ESAKA (50,000 shares) ~$3.17M

FUMIHIDE ESAKA filed a Form 144 with the SEC indicating intent to sell AMBQ (Ambiq Micro, Inc.) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: FUMIHIDE ESAKA Shares: 50,000 Est. Value: $3.17M

How we classify Ambiq Micro, Inc.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on AMBQ. Read these alongside the fundamentals rather than in isolation.

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Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.
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