Ambarella, Inc.
US ˙ NasdaqGS ˙ KYG037AX1015

SecurityAMBA / Ambarella, Inc.
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership638,587 shares
Latest Disclosed Value $ 32,866,366
Dimensional Fund Advisors Lp reports 28.06% increase in ownership of AMBA / Ambarella, Inc.

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 638,587 shares of Ambarella, Inc. (US:AMBA) valued at $32,871,266 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 498,659 shares of Ambarella, Inc.. This represents a change in shares of 28.06% during the quarter. The current value of the position is $40,563,046 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)
2026-05-07 2026-03-31 13F AMBARELLA SHS G037AX101 638,587 139,928 28.06 32,866 -6.95 0.0068
2026-02-12 2025-12-31 13F AMBARELLA SHS G037AX101 498,659 -12,939 -2.53 35,322 -16.33 0.0074
2025-11-12 2025-09-30 13F AMBARELLA SHS G037AX101 511,598 -4,561 -0.88 42,217 23.79 0.0091
2025-08-12 2025-06-30 13F AMBARELLA SHS G037AX101 516,159 -27,524 -5.06 34,104 24.64 0.0079
2025-05-13 2025-03-31 13F AMBARELLA SHS G037AX101 543,683 -79,436 -12.75 27,362 -39.63 0.0068
2025-02-13 2024-12-31 13F AMBARELLA SHS G037AX101 623,119 -28,212 -4.33 45,325 23.37 0.0109
2024-11-07 2024-09-30 13F AMBARELLA SHS G037AX101 651,331 -31,788 -4.65 36,738 -0.31 0.0089
2024-08-09 2024-06-30 13F AMBARELLA SHS G037AX101 683,119 2,994 0.44 36,854 6.73 0.0096
2024-05-10 2024-03-31 13F AMBARELLA SHS G037AX101 680,125 -24,225 -3.44 34,530 -20.02 0.0093
2024-02-07 2023-12-31 13F AMBARELLA SHS G037AX101 704,350 29,379 4.35 43,171 20.61 0.0126
2023-11-09 2023-09-30 13F AMBARELLA SHS G037AX101 674,971 8,952 1.34 35,793 -35.77 0.0117
2023-08-09 2023-06-30 13F AMBARELLA SHS G037AX101 666,019 35,005 5.55 55,726 14.07 0.0178
2023-05-12 2023-03-31 13F AMBARELLA SHS G037AX101 631,014 24,920 4.11 48,852 99,597.96 0.0165
2023-02-09 2022-12-31 13F AMBARELLA SHS G037AX101 606,094 21,071 3.60 50 -99.85 0.0147
2022-11-10 2022-09-30 13F AMBARELLA SHS G037AX101 585,023 32,045 5.79 32,869 -9.20 0.0126
2022-08-12 2022-06-30 13F AMBARELLA SHS G037AX101 552,978 -26,829 -4.63 36,200 -40.49 0.0130
2022-05-13 2022-03-31 13F AMBARELLA CLA G037AX101 579,807 -9,948 -1.69 60,834 -49.16 0.0187
2022-02-09 2021-12-31 13F AMBARELLA CLA G037AX101 589,755 -46,534 -7.31 119,652 20.74 0.0362
2021-11-12 2021-09-30 13F AMBARELLA CLA G037AX101 636,289 -2,959 -0.46 99,096 45.38 0.0319
2021-08-12 2021-06-30 13F AMBARELLA CLA G037AX101 639,248 -34,990 -5.19 68,164 0.62 0.0216
2021-05-14 2021-03-31 13F AMBARELLA CLA G037AX101 674,238 -42,722 -5.96 67,744 2.90 0.0224
2021-03-08 2020-12-31 13F/A-2 AMBARELLA CLA G037AX101 716,960 -8,287 -1.14 65,832 73.96 0.0238
2021-02-11 2020-12-31 13F AMBARELLA CLA G037AX101 716,960 -8,287 65,832 23,775.0192
2020-11-12 2020-09-30 13F AMBARELLA CLA G037AX101 725,247 6,105 0.85 37,843 14.90 0.0160
2020-08-13 2020-06-30 13F AMBARELLA CLA G037AX101 719,142 23,351 3.36 32,935 -2.52 0.0145
2020-05-14 2020-03-31 13F AMBARELLA CLA G037AX101 695,791 -12,035 -1.70 33,785 -21.18 0.0176
2020-02-14 2019-12-31 13F AMBARELLA CLA G037AX101 707,826 2,890 0.41 42,866 -3.22 0.0156
2019-11-12 2019-09-30 13F AMBARELLA CLA G037AX101 704,936 -297 -0.04 44,294 42.32 0.0172
2019-08-13 2019-06-30 13F AMBARELLA CLA G037AX101 705,233 9,830 1.41 31,122 3.60 0.0121
2019-08-12 2019-03-31 13F/A-2 AMBARELLA CLA G037AX101 695,403 230,586 49.61 30,041 84.75 0.0120
2019-05-10 2019-03-31 13F AMBARELLA CLA G037AX101 695,403 230,586 30,041
2019-02-26 2018-12-31 13F/A-1 AMBARELLA CLA G037AX101 464,817 92,847 24.96 16,260 13.01 0.0074
2019-02-13 2018-12-31 13F AMBARELLA CLA G037AX101 464,817 92,847 16,260
2018-11-13 2018-09-30 13F AMBARELLA CLA G037AX101 371,970 -13,838 -3.59 14,388 -3.41 0.0055
2018-08-10 2018-06-30 13F AMBARELLA CLA G037AX101 385,808 82,457 27.18 14,896 0.24 0.0059
2018-05-11 2018-03-31 13F AMBARELLA CLA G037AX101 303,351 130,586 75.59 14,861 46.41 0.0062
2018-02-12 2017-12-31 13F AMBARELLA CLA G037AX101 172,765 0 0.00 10,150 19.88 0.0042
2017-11-13 2017-09-30 13F AMBARELLA CLA G037AX101 172,765 98,965 134.10 8,467 136.31 0.0037
2017-08-11 2017-06-30 13F AMBARELLA CLA G037AX101 73,800 -4,494 -5.74 3,583 -16.36 0.0017
2017-05-12 2017-03-31 13F AMBARELLA CLA G037AX101 78,294 -2,072 -2.58 4,284 -1.52 0.0020
2017-02-09 2016-12-31 13F AMBARELLA CLA G037AX101 80,366 -3,155 -3.78 4,350 -29.23 0.0022
2016-11-10 2016-09-30 13F AMBARELLA CLA G037AX101 83,521 79,508 1,981.26 6,147 2,913.24 0.0033
2016-08-09 2016-06-30 13F AMBARELLA CLA G037AX101 4,013 4,013 204 0.0001
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.