SEC Form 4
Ambarella, Inc. (AMBA) insider trading
In the 12 months to Oct 26, 2026, 7 AMBA insiders reported open-market sales of $16.9M across 31 filings; no open-market purchases were filed.
Latest filing · Last 12 months · Source: SEC EDGAR · How we count
- Open-market sales
- $16.9M
- 31 filings · 7 insiders
- Open-market purchases
- $0
- 0 filings
- Pre-arranged sales (10b5-1)
- 9 of 31
- $8.1M of $16.9M sold (48%)
Who traded AMBA, and when
- Sale
- Sale, pre-arranged (10b5-1)
AMBA daily close from Oct 27, 2025 to Oct 26, 2026, between $48.65 and $95.51, last $66.47. 31 sale and 0 purchase filings by 7 insiders, marked at their filing dates. Feng-Ming Wang, CEO: sold $10.1M across 7 filings, first filed Dec 19, 2025, last Sep 18, 2026. Chi-Hong Ju, Senior VP, Systems & GM, Asia → Senior VP, Systems & GM: sold $2.8M across 7 filings, first filed Dec 19, 2025, last Sep 18, 2026. John Alexander Young, CFO: sold $1.7M across 7 filings, first filed Dec 19, 2025, last Sep 21, 2026. Yun-Lung Chen, VP, Business Development and → VP, Business Dev. & Marketing: sold $1.1M across 2 filings, first filed Jun 16, 2026, last Jul 10, 2026. Chan W. Lee, Chief Operations Officer: sold $1.1M across 4 filings, first filed Dec 19, 2025, last Sep 18, 2026. Christopher B. Paisley, Director: sold $69.3K across 3 filings, first filed Dec 29, 2025, last Sep 28, 2026. Elizabeth M. Schwarting, Director: sold $45.2K across 1 filing, first filed Dec 18, 2025, last Dec 18, 2025.
Largest mark · tap a row for others
Feng-Ming Wang · CEO
Sale $3,040,031
50,000 shares
Filed Mar 4, 2026 · traded Mar 2
Pre-arranged (10b5-1) · close on filing date $56.55
Feng-Ming Wang · CEO
CEO
$10.1M soldChi-Hong Ju · Senior VP, Systems & GM, Asia → Senior VP, Systems & GM
Senior VP, Systems & GM, Asia → Senior VP, Systems & GM
$2.8M soldJohn Alexander Young · CFO
CFO
$1.7M soldYun-Lung Chen · VP, Business Development and → VP, Business Dev. & Marketing
VP, Business Development and → VP, Business Dev. & Marketing
$1.1M soldChan W. Lee · Chief Operations Officer
Chief Operations Officer
$1.1M soldChristopher B. Paisley · Director
Director
$69.3K soldElizabeth M. Schwarting · Director
Director
$45.2K soldOpen-market trades
31 filings in the last 12 months| Insider | Role | Sold | Bought | Filings | Pre-arranged (10b5-1) | Last filed |
|---|---|---|---|---|---|---|
| Feng-Ming Wang | CEO | $10.1M | — | 7 | 74% of sales | |
| Chi-Hong Ju | Senior VP, Systems & GM, Asia → Senior VP, Systems & GM | $2.8M | — | 7 | — | |
| John Alexander Young | CFO | $1.7M | — | 7 | 37% of sales | |
| Yun-Lung Chen | VP, Business Development and → VP, Business Dev. & Marketing | $1.1M | — | 2 | — | |
| Chan W. Lee | Chief Operations Officer | $1.1M | — | 4 | — | |
| Christopher B. Paisley | Director | $69.3K | — | 3 | 48% of sales | |
| Elizabeth M. Schwarting | Director | $45.2K | — | 1 | — |
| Filed | Insider | Type | Shares | Value | Held after | Source |
|---|---|---|---|---|---|---|
traded | Christopher B. Paisley Director | SalePre-arranged (10b5-1) | 250 ordinary shares | $17.7K | 43,930 | |
traded | John Alexander Young CFO | SalePre-arranged (10b5-1) | 1,896 ordinary shares | $127.6K | 107,806 | |
traded | John Alexander Young CFO | Sale | 3,126 ordinary shares | $202.7K | 109,702 | |
traded | Chan W. Lee Chief Operations Officer | Sale | 2,893 ordinary shares | $187.6K | 154,443 | |
traded | Chi-Hong Ju Senior VP, Systems & GM | Sale | 2,009 ordinary shares | $130.2K | 154,153 | |
traded | Feng-Ming Wang CEO | Sale | 6,086 ordinary shares | $394.6K | 767,759 | |
traded | Yun-Lung Chen VP, Business Dev. & Marketing | Sale | 5,958 ordinary shares | $468.7K | 60,557 | |
traded | Feng-Ming Wang CEO | SalePre-arranged (10b5-1) | 16,250 ordinary shares | $1.5M | 773,607 | |
traded | Chi-Hong Ju Senior VP, Systems & GM | Sale | 10,000 ordinary shares | $888.4K | 155,924 | |
traded | Christopher B. Paisley Director | SalePre-arranged (10b5-1) | 250 ordinary shares | $15.5K | 41,029 | |
traded | Feng-Ming Wang CEO | Sale | 6,204 ordinary shares | $421.1K | 799,857 | |
traded | Chi-Hong Ju Senior VP, Systems & GM | Sale | 2,017 ordinary shares | $136.9K | 165,924 | |
traded | Chan W. Lee Chief Operations Officer | Sale | 2,951 ordinary shares | $200.3K | 157,098 | |
traded | John Alexander Young CFO | SalePre-arranged (10b5-1) | 5,033 ordinary shares | $339.9K | 112,590 | |
traded | Yun-Lung Chen VP, Business Development and | Sale | 9,856 ordinary shares | $660.9K | 66,515 | |
traded | Feng-Ming Wang CEO | SalePre-arranged (10b5-1) | 32,500 ordinary shares | $3.0M | 815,211 | |
traded | John Alexander Young CFO | SalePre-arranged (10b5-1) | 400 ordinary shares | $38.4K | 117,623 | |
traded | John Alexander Young CFO | SalePre-arranged (10b5-1) | 1,971 ordinary shares | $118.3K | 117,623 | |
traded | Feng-Ming Wang CEO | Sale | 27,059 ordinary shares | $1.4M | 838,561 | |
traded | Chi-Hong Ju Senior VP, Systems & GM, Asia | Sale | 6,884 ordinary shares | $366.2K | 167,941 | |
traded | Chan W. Lee Chief Operations Officer | Sale | 10,370 ordinary shares | $552.2K | 160,049 | |
traded | John Alexander Young CFO | Sale | 7,615 ordinary shares | $406.0K | 119,594 | |
traded | Feng-Ming Wang CEO | SalePre-arranged (10b5-1) | 50,000 ordinary shares | $3.0M | 781,019 | |
traded | Chi-Hong Ju Senior VP, Systems & GM, Asia | Sale | 7,945 ordinary shares | $558.1K | 149,587 | |
traded | Chi-Hong Ju Senior VP, Systems & GM, Asia | Sale | 7,728 ordinary shares | $584.1K | 146,039 | |
traded | Christopher B. Paisley Director | Sale | 500 ordinary shares | $36.1K | 41,279 | |
traded | Feng-Ming Wang CEO | Sale | 4,950 ordinary shares | $355.5K | 783,979 | |
traded | Chi-Hong Ju Senior VP, Systems & GM, Asia | Sale | 1,342 ordinary shares | $96.4K | 157,532 | |
traded | Chan W. Lee Chief Operations Officer | Sale | 2,406 ordinary shares | $172.8K | 124,566 | |
traded | John Alexander Young CFO | Sale | 6,370 ordinary shares | $461.8K | 102,738 | |
traded | Elizabeth M. Schwarting Director | Sale | 624 ordinary shares | $45.2K | 6,690 |
Shares are as filed (ordinary shares or ADS); values are as converted to US$ in the filing.
GET /stocks/filings/vX/form-4?tickers=AMBA&filing_date.gte=2025-10-26&sort=filing_date.desc&limit=500{
"status": "OK",
"results": [
{
"tickers": [
"AMBA"
],
"issuer_cik": "0001280263",
"owner_cik": "0001189229",
"accession_number": "0001280263-26-000077",
"form_type": "4",
"filing_date": "2026-09-28",
"period_of_report": "2026-09-25",
"issuer_name": "AMBARELLA INC",
"issuer_trading_symbol": "AMBA",
"owner_name": "PAISLEY CHRISTOPHER B",
"is_director": true,
"is_officer": false,
"is_ten_percent_owner": false,
"is_other": false,
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Ordinary Shares",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-09-25",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 250,
"transaction_price_per_share": 70.76,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 43930,
"transaction_value": 17690,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on September 22, 2025."
}
]
},
{
"tickers": [
"AMBA"
],
"issuer_cik": "0001280263",
"owner_cik": "0002009866",
"accession_number": "0001280263-26-000075",
"form_type": "4",
"filing_date": "2026-09-21",
"period_of_report": "2026-09-18",
"issuer_name": "AMBARELLA INC",
"issuer_trading_symbol": "AMBA",
"owner_name": "Young John Alexander",
"is_director": false,
"is_officer": true,
"is_ten_percent_owner": false,
"is_other": false,
"officer_title": "CFO",
"security_type": "non_derivative",
"record_type": "transaction",
"security_title": "Ordinary Shares",
"transaction_timeliness": "O",
"aff_10b5_one": true,
"transaction_date": "2026-09-18",
"transaction_code": "S",
"equity_swap_involved": false,
"transaction_shares": 1896,
"transaction_price_per_share": 67.28,
"transaction_acquired_disposed": "D",
"shares_owned_following_transaction": 107806,
"transaction_value": 127562.88,
"not_subject_to_section_16": false,
"direct_or_indirect": "D",
"footnotes": [
{
"id": "F1",
"description": "The sales reported on this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted on January 15, 2026."
}
]
}
]
}
// trimmed to 2 resultsThe response includes every Form 4 record; this page keeps open-market purchases and sales on common stock and removes duplicate joint-filer rows.
Other insider activity (not market trades) · 29 records
- Option exercises7 records
- Grants and awards18 records
- Gifts4 records
Reported on Form 4 but not purchases or sales in the market, so not counted in the totals above.
How to read this page
- Open-market purchase or sale
- A buy or sell of the company's stock at market price. Grants, option exercises, shares withheld for tax, gifts and employee stock plan purchases are listed separately and not counted.
- Pre-arranged (10b5-1)
- The insider marked the filing as made under a trading plan set up in advance (SEC Rule 10b5-1). The mark covers the whole filing, and an unmarked filing may still be under a plan.
- Role
- The title on each filing. Someone whose title changed shows more than one.
- Filing date
- Insiders have two business days to report a trade. Totals and the chart use the filing date, when the trade became public.
- Counted once
- When several owners (a fund and its partners, say) report the same trade, it's counted once. Corrected filings replace the originals.
Frequently asked questions
Has Ambarella, Inc.'s CEO sold stock?
Yes. Feng-Ming Wang (CEO) sold 143,049 shares ($10.1M) between Dec 2025 and Sep 2026, $7.5M of it under a pre-arranged 10b5-1 plan.
How current is AMBA’s insider data?
These are AMBA Form 4 filings from the last year, refreshed daily. The Massive Form 4 API has the full, continuously updated record.
What counts as an open-market buy or sell?
Only purchases and sales at the market price. Option exercises, grants, gifts, and shares withheld for taxes are reported on Form 4 but are left out of the buy and sell totals.
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This page joins two Massive endpoints: Form 4 filings and daily prices. Ask an agent to watch for new filings:
Using the Massive API (massive.com/docs/llms.txt), check Form 4 filings for AMBA every day with transaction_code=P and tell me when an insider files an open-market purchase, with their role, shares, price and the filing link.
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