Ambarella, Inc.
Ambarella, Inc. (AMBA) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · AMBA · as of Sep 30, 2025
Ownership Breakdown
359
Institutional Holders
▲ 27 vs Q2
$2.94B
Total Inst. Value
▲ $613.88M vs Q2
43.87M
Shares Outstanding
freeFloat 94.34%
35.58M
13F Shares Held
▲ 431,236 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
AMBA largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC semiconductors & related devices | 5.17M | 12.19% | 12.19% | $426.52B | Nov 7, 2025 | ▲ 4.5K |
BLACKROCK, INC. semiconductors & related devices | 3.92M | 9.25% | 9.25% | $323.66B | Nov 12, 2025 | ▲ 4.5K |
STATE STREET CORP semiconductors & related devices | 1.68M | 3.97% | 3.97% | $138.70B | Nov 14, 2025 | ▼ 174.3K |
JERICHO CAPITAL ASSET MANAGEMENT L.P. semiconductors & related devices | 1.21M | 2.86% | 2.86% | $100.13B | Nov 14, 2025 | ▲ 114.9K |
FULLER & THALER ASSET MANAGEMENT, INC. semiconductors & related devices | 1.11M | 2.61% | 2.61% | $91.41B | Nov 13, 2025 | ▲ 90.4K |
GEODE CAPITAL MANAGEMENT, LLC semiconductors & related devices | 985.0K | 2.32% | 2.32% | $81.30B | Nov 12, 2025 | ▲ 8.7K |
MORGAN STANLEY semiconductors & related devices | 958.5K | 2.26% | 2.26% | $79.10B | May 27, 2026 | ▲ 166.4K |
MANUFACTURERS LIFE INSURANCE COMPANY, THE semiconductors & related devices | 853.2K | 2.01% | 2.01% | $70.41B | Nov 14, 2025 | ▼ 518.3K |
UBS GROUP AG semiconductors & related devices | 821.7K | 1.94% | 1.94% | $67.81B | Nov 13, 2025 | ▲ 650.3K |
BARCLAYS PLC semiconductors & related devices | 775.1K | 1.83% | 1.83% | $63.96B | Mar 31, 2026 | ▲ 425.5K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
33
Increased
+4.23M shares3
New Positions
first time holders14
Decreased
−1.74M shares0
Sold Out
fully exitedNet shares change (top 50)
+2.49M
+4.23M / −1.74M
Net new holders
+22
3 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
AMBA insider trading · insider activity
Source: SEC Form 4
Insiders have been primarily selling shares recently. Selling may be driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment.
1
Buy transactions
6
Sell transactions
0.17
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
Young John Alexander CFO | May 26, 2026 | Sale | 400 | $96.00 | $38.4K | 117.6K | Form 4 ↗ |
Wang Feng-Ming CEO | May 26, 2026 | Sale | 17,285 | $90.38 | $1.56M | 821.3K | Form 4 ↗ |
Wang Feng-Ming CEO | May 26, 2026 | Sale | 6,065 | $91.23 | $553.3K | 815.2K | Form 4 ↗ |
Wang Feng-Ming CEO | May 26, 2026 | Sale | 9,150 | $92.05 | $842.2K | 806.1K | Form 4 ↗ |
Young John Alexander CFO | Apr 21, 2026 | Sale | 1,971 | $60.00 | $118.3K | 117.6K | Form 4 ↗ |
Young John Alexander CFO | Mar 18, 2026 | Award | 5,560 | — | — | 122.6K | Form 4 ↗ |
Young John Alexander CFO | Mar 19, 2026 | Sale | 3,038 | $54.14 | $164.5K | 119.6K | Form 4 ↗ |
Young John Alexander CFO | Mar 17, 2026 | Sale | 4,577 | $52.77 | $241.5K | 117.1K | Form 4 ↗ |
Chen Yun-Lung VP, Business Development and M | Mar 18, 2026 | Award | 2,849 | — | — | 76.4K | Form 4 ↗ |
Lee Chan W Chief Operations Officer | Mar 18, 2026 | Award | 7,320 | — | — | 163.7K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Ambarella, Inc. (AMBA) is primarily owned by institutional investors, who hold approximately 81.1% of total shares outstanding. Company insiders own approximately 5.66%, while retail and public investors account for the remaining 13.23%.
The largest institutional shareholder of Ambarella, Inc. is VANGUARD GROUP INC, holding approximately 5.17 million shares — equal to 12.19% of outstanding shares — as of September 30, 2025.
A total of 359 institutional investors currently hold AMBA stock, with a combined institutional value of approximately $2.94 billion as of the most recent 13F filing period.
Frequently asked questions
AMBA ownershipAmbarella, Inc. (AMBA) is primarily owned by institutional investors, who hold approximately 81.1% of shares. The largest shareholder is VANGUARD GROUP INC with a 12.19% stake. Company insiders hold 5.66%. Data sourced from SEC Form 13F as of September 30, 2025.