Ambarella, Inc.
US ˙ NasdaqGS ˙ KYG037AX1015

SecurityAMBA / Ambarella, Inc.
InstitutionFmr Llc
Latest Disclosed Ownership302,337 shares
Latest Disclosed Value $ 15,562,815
Fmr Llc reports 7.45% increase in ownership of AMBA / Ambarella, Inc.

On May 15, 2026 - Fmr Llc filed a 13F-HR form disclosing ownership of 302,337 shares of Ambarella, Inc. (US:AMBA) valued at $15,562,797 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 281,370 shares of Ambarella, Inc.. This represents a change in shares of 7.45% during the quarter. The current value of the position is $22,312,471 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F AMBARELLA SHS G037AX101 302,337 20,967 7.45 15,563 -21.92 0.0002
2026-02-17 2025-12-31 13F AMBARELLA SHS G037AX101 281,370 39,505 16.33 19,932 -0.13 0.0010
2025-11-13 2025-09-30 13F AMBARELLA SHS G037AX101 241,865 21,120 9.57 19,959 36.86 0.0010
2025-08-14 2025-06-30 13F AMBARELLA SHS G037AX101 220,745 -7,671 -3.36 14,584 26.85 0.0008
2025-05-12 2025-03-31 13F AMBARELLA SHS G037AX101 228,416 136,688 149.01 11,496 72.30 0.0007
2025-02-13 2024-12-31 13F AMBARELLA SHS G037AX101 91,728 74,626 436.36 6,672 592.12 0.0004
2024-11-13 2024-09-30 13F AMBARELLA SHS G037AX101 17,102 11,110 185.41 965 198.45 0.0001
2024-08-13 2024-06-30 13F AMBARELLA SHS G037AX101 5,992 4,500 301.61 323 330.67 0.0000
2024-05-13 2024-03-31 13F AMBARELLA SHS G037AX101 1,492 -350,262 -99.58 76 -99.65 0.0000
2024-02-13 2023-12-31 13F AMBARELLA SHS G037AX101 351,754 -189 -0.05 21,559 15.51 0.0017
2023-11-13 2023-09-30 13F AMBARELLA SHS G037AX101 351,943 -669 -0.19 18,664 -36.74 0.0016
2023-08-11 2023-06-30 13F AMBARELLA SHS G037AX101 352,612 336,576 2,098.88 29,503 2,277.36 0.0025
2023-08-11 2023-03-31 13F/A-1 AMBARELLA SHS G037AX101 16,036 13,381 503.99 1,242 469.27 0.0001
2023-05-11 2023-03-31 13F AMBARELLA SHS G037AX101 16,036 13,381 1,242 0.0000
2023-02-13 2022-12-31 13F AMBARELLA SHS G037AX101 2,655 332 14.29 218 66.41 0.0000
2022-11-10 2022-09-30 13F AMBARELLA SHS G037AX101 2,323 -165 -6.63 131 -19.63 0.0000
2022-08-12 2022-06-30 13F AMBARELLA SHS G037AX101 2,488 -164,477 -98.51 163 -99.07 0.0000
2022-05-13 2022-03-31 13F AMBARELLA SHS G037AX101 166,965 38,009 29.47 17,518 -33.05 0.0014
2022-02-14 2021-12-31 13F AMBARELLA SHS G037AX101 128,956 -81,740 -38.80 26,164 -20.27 0.0019
2022-02-14 2021-09-30 13F/A-1 AMBARELLA SHS G037AX101 210,696 41,656 24.64 32,814 82.05 0.0026
2021-11-15 2021-09-30 13F AMBARELLA SHS G037AX101 210,696 41,656 32,814 0.0026
2021-08-13 2021-06-30 13F AMBARELLA SHS G037AX101 169,040 -291,470 -63.29 18,025 -61.01 0.0014
2021-05-14 2021-03-31 13F AMBARELLA SHS G037AX101 460,510 349,728 315.69 46,231 354.49 0.0039
2021-02-08 2020-12-31 13F AMBARELLA SHS G037AX101 110,782 -36 -0.03 10,172 75.93 0.0009
2020-11-13 2020-09-30 13F AMBARELLA SHS G037AX101 110,818 -4,671 -4.04 5,782 9.32 0.0006
2020-08-24 2020-06-30 13F/A-1 AMBARELLA SHS G037AX101 115,489 -340,745 -74.69 5,289 -76.13 0.0006
2020-08-13 2020-06-30 13F AMBARELLA SHS G037AX101 115,489 -340,745 5,289 129.9353
2020-05-14 2020-03-31 13F AMBARELLA SHS G037AX101 456,234 -191,122 -29.52 22,154 -43.49 0.0031
2020-02-07 2019-12-31 13F AMBARELLA SHS G037AX101 647,356 619,245 2,202.86 39,204 2,119.93 0.0043
2019-11-13 2019-09-30 13F AMBARELLA SHS G037AX101 28,111 -87,761 -75.74 1,766 -65.47 0.0002
2019-08-13 2019-06-30 13F AMBARELLA SHS G037AX101 115,872 -8,210 -6.62 5,114 -4.59 0.0006
2019-05-13 2019-03-31 13F AMBARELLA SHS G037AX101 124,082 68 0.05 5,360 23.56 0.0006
2019-02-13 2018-12-31 13F AMBARELLA SHS G037AX101 124,014 -195,613 -61.20 4,338 -64.91 0.0006
2018-11-09 2018-09-30 13F AMBARELLA SHS G037AX101 319,627 319,627 12,363 0.0014
2018-02-12 2017-12-31 13F AMBARELLA SHS G037AX101 0 -246,900 -100.00 0 -100.00
2017-11-13 2017-09-30 13F AMBARELLA SHS G037AX101 246,900 115,600 88.04 12,101 89.82 0.0015
2017-08-29 2017-06-30 13F/A-1 AMBARELLA SHS G037AX101 131,300 -171,639 -56.66 6,375 -61.54 0.0008
2017-08-11 2017-06-30 13F AMBARELLA SHS G037AX101 131,300 -171,639 6,375
2017-05-11 2017-03-31 13F AMBARELLA SHS G037AX101 302,939 20,270 7.17 16,574 8.32 0.0021
2017-02-10 2016-12-31 13F AMBARELLA SHS G037AX101 282,669 -462,300 -62.06 15,301 -72.10 0.0020
2016-11-14 2016-09-30 13F AMBARELLA SHS G037AX101 744,969 133,433 21.82 54,838 76.49 0.0073
2016-08-11 2016-06-30 13F AMBARELLA SHS G037AX101 611,536 -113,164 -15.62 31,072 -4.08 0.0042
2016-05-16 2016-03-31 13F AMBARELLA SHS G037AX101 724,700 513,800 243.62 32,394 175.55 0.0045
2016-02-12 2015-12-31 13F AMBARELLA SHS G037AX101 210,900 210,900 0.00 11,756 0.0016
2015-11-10 2015-09-30 13F AMBARELLA SHS G037AX101 0 -739,900 -100.00 0 -100.00
2015-08-25 2015-06-30 13F/A-1 AMBARELLA SHS G037AX101 739,900 -709,060 -48.94 75,980 -30.74 0.0097
2015-08-13 2015-06-30 13F AMBARELLA SHS G037AX101 739,900 75,980
2015-05-14 2015-03-31 13F AMBARELLA SHS G037AX101 1,448,960 -64,200 -4.24 109,701 42.94 0.0140
2015-02-17 2014-12-31 13F AMBARELLA SHS G037AX101 1,513,160 -258,940 -14.61 76,748 -0.83 0.0100
2014-11-14 2014-09-30 13F AMBARELLA SHS G037AX101 1,772,100 379,600 27.26 77,387 78.24 0.0105
2014-08-14 2014-06-30 13F AMBARELLA SHS G037AX101 1,392,500 1,263,100 976.12 43,418 1,156.31 0.0058
2014-05-15 2014-03-31 13F AMBARELLA SHS G037AX101 129,400 129,400 3,456 0.0005
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.