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 Mar 31, 2025
Ownership Breakdown
319
Institutional Holders
▼ 8 vs Q4
$1.77B
Total Inst. Value
▼ $681.16M vs Q4
43.87M
Shares Outstanding
freeFloat 94.34%
35.25M
13F Shares Held
▲ 1.48M vs Q4
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
Q1 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
VANGUARD GROUP INC semiconductors & related devices | 4.85M | 11.74% | 11.74% | $244.02B | May 9, 2025 | ▲ 152.2K |
BLACKROCK, INC. semiconductors & related devices | 3.79M | 9.18% | 9.18% | $190.74B | May 2, 2025 | ▼ 34.9K |
STATE STREET CORP semiconductors & related devices | 1.70M | 4.12% | 4.12% | $85.74B | May 15, 2025 | ▲ 116.8K |
MANUFACTURERS LIFE INSURANCE COMPANY, THE semiconductors & related devices | 1.32M | 3.19% | 3.19% | $66.36B | May 15, 2025 | ▼ 133.6K |
UBS ASSET MANAGEMENT AMERICAS INC semiconductors & related devices | 1.23M | 2.98% | 2.98% | $62.02B | May 19, 2025 | ▲ 579.9K |
GEODE CAPITAL MANAGEMENT, LLC semiconductors & related devices | 947.9K | 2.29% | 2.29% | $47.72B | May 13, 2025 | ▲ 33.4K |
FULLER & THALER ASSET MANAGEMENT, INC. semiconductors & related devices | 910.9K | 2.21% | 2.21% | $45.85B | May 13, 2025 | ▲ 185.4K |
KODAI CAPITAL MANAGEMENT LP semiconductors & related devices | 904.5K | 2.19% | 2.19% | $45.53B | May 15, 2025 | ▲ 126.0K |
MILLENNIUM MANAGEMENT LLC semiconductors & related devices | 910.2K | 2.18% | 2.18% | $45.81B | May 15, 2025 | ▼ 484.0K |
MORGAN STANLEY semiconductors & related devices | 761.9K | 1.84% | 1.84% | $38.34B | May 15, 2025 | ▼ 80.9K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q1 2025 vs prior quarter
Q1 2025
25
Increased
+3.98M shares5
New Positions
first time holders19
Decreased
−1.68M shares0
Sold Out
fully exitedNet shares change (top 50)
+2.30M
+3.98M / −1.68M
Net new holders
+11
5 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 80.4% of total shares outstanding. Company insiders own approximately 5.66%, while retail and public investors account for the remaining 13.98%.
The largest institutional shareholder of Ambarella, Inc. is VANGUARD GROUP INC, holding approximately 4.85 million shares — equal to 11.74% of outstanding shares — as of March 31, 2025.
A total of 319 institutional investors currently hold AMBA stock, with a combined institutional value of approximately $1.77 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 80.4% of shares. The largest shareholder is VANGUARD GROUP INC with a 11.74% stake. Company insiders hold 5.66%. Data sourced from SEC Form 13F as of March 31, 2025.