Ambarella, Inc.
US ˙ NasdaqGS ˙ KYG037AX1015

SecurityAMBA / Ambarella, Inc.
InstitutionQuantbot Technologies LP
Latest Disclosed Ownership25,225 shares
Latest Disclosed Value $ 1,298,457
Quantbot Technologies LP reports 6.40% increase in ownership of AMBA / Ambarella, Inc.

On May 13, 2026 - Quantbot Technologies LP filed a 13F-HR form disclosing ownership of 25,225 shares of Ambarella, Inc. (US:AMBA) valued at $1,298,457 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 10, 2026 disclosing 23,707 shares of Ambarella, Inc.. This represents a change in shares of 6.40% during the quarter. The current value of the position is $1,861,605 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)
2026-05-13 2026-03-31 13F AMBARELLA COM G037AX101 25,225 1,518 6.40 1,298 -22.69 0.0531
2026-02-10 2025-12-31 13F AMBARELLA COM G037AX101 23,707 18,192 329.86 1,679 269.01 0.0559
2025-11-12 2025-09-30 13F AMBARELLA COM G037AX101 5,515 -6,274 -53.22 455 -41.52 0.0124
2025-08-13 2025-06-30 13F AMBARELLA COM G037AX101 11,789 8,185 227.11 779 329.83 0.0200
2025-05-13 2025-03-31 13F AMBARELLA COM G037AX101 3,604 3,604 181 0.0058
2025-02-11 2024-12-31 13F AMBARELLA COM G037AX101 0 -18,872 -100.00 0 -100.00
2024-11-13 2024-09-30 13F AMBARELLA COM G037AX101 18,872 -7,649 -28.84 1,064 -25.59 0.0420
2024-08-09 2024-06-30 13F AMBARELLA COM G037AX101 26,521 -31,906 -54.61 1,431 -51.79 0.0692
2024-05-06 2024-03-31 13F AMBARELLA COM G037AX101 58,427 19,033 48.31 2,966 22.87 0.1672
2024-02-14 2023-12-31 13F AMBARELLA COM G037AX101 39,394 16,685 73.47 2,414 100.50 0.1402
2023-11-07 2023-09-30 13F AMBARELLA COM G037AX101 22,709 21,088 1,300.93 1,204 791.85 0.0809
2023-08-08 2023-06-30 13F AMBARELLA COM G037AX101 1,621 1,408 661.03 136 743.75 0.0089
2023-05-12 2023-03-31 13F AMBARELLA COM G037AX101 213 213 16 0.0012
2023-02-13 2022-12-31 13F AMBARELLA COM G037AX101 0 -17,175 -100.00 0 -100.00
2022-11-07 2022-09-30 13F AMBARELLA COM G037AX101 17,175 17,175 964 0.0728
2022-05-16 2022-03-31 13F AMBARELLA COM G037AX101 0 -2,204 -100.00 0 -100.00
2022-02-11 2021-12-31 13F AMBARELLA COM G037AX101 2,204 -7,059 -76.21 447 -69.00 0.0363
2021-11-09 2021-09-30 13F AMBARELLA COM G037AX101 9,263 9,263 1,442 0.1055
2021-08-12 2021-06-30 13F AMBARELLA COM G037AX101 0 -22,115 -100.00 0 -100.00
2021-05-14 2021-03-31 13F AMBARELLA COM G037AX101 22,115 22,115 2,220 0.2113
2020-11-16 2020-09-30 13F AMBARELLA COM G037AX101 0 -5 -100.00 0 0.0000
2020-08-13 2020-06-30 13F AMBARELLA COM G037AX101 5 5 0 0.0000
2020-05-13 2020-03-31 13F AMBARELLA COM G037AX101 0 -1,568 -100.00 0 -100.00
2020-02-10 2019-12-31 13F AMBARELLA COM G037AX101 1,568 -29,799 -95.00 94 -95.23 0.0093
2019-11-12 2019-09-30 13F AMBARELLA COM G037AX101 31,367 2,833 9.93 1,970 56.47 0.1942
2019-08-13 2019-06-30 13F AMBARELLA COM G037AX101 28,534 24,234 563.58 1,259 580.54 0.1259
2019-05-13 2019-03-31 13F AMBARELLA COM G037AX101 4,300 1,755 68.96 185 107.87 0.0176
2019-02-13 2018-12-31 13F AMBARELLA COM G037AX101 2,545 -22,591 -89.88 89 -90.84 0.0087
2018-11-13 2018-09-30 13F AMBARELLA COM G037AX101 25,136 -20,470 -44.88 972 -44.77 0.0680
2018-08-13 2018-06-30 13F AMBARELLA COM G037AX101 45,606 45,606 1,760 0.1198
2017-11-07 2017-09-30 13F AMBARELLA COM G037AX101 0 -9,832 -100.00 0 -100.00
2017-08-11 2017-06-30 13F AMBARELLA COM G037AX101 9,832 4,591 87.60 477 66.78 0.0449
2017-05-10 2017-03-31 13F AMBARELLA COM G037AX101 5,241 -1,944 -27.06 286 -26.29 0.0300
2017-02-09 2016-12-31 13F AMBARELLA COM G037AX101 7,185 7,185 388 0.0430
2016-08-02 2016-06-30 13F AMBARELLA COM G037AX101 0 -20,301 -100.00 0 -100.00
2016-04-28 2016-03-31 13F AMBARELLA COM G037AX101 20,301 7,640 60.34 907 28.65 0.1452
2016-01-22 2015-12-31 13F AMBARELLA COM G037AX101 12,661 -3,969 -23.87 705 -26.64 0.1210
2015-10-22 2015-09-30 13F AMBARELLA COM G037AX101 16,630 16,607 72,204.35 961 47,950.00 0.1676
2015-07-27 2015-06-30 13F AMBARELLA COM G037AX101 23 -14,829 -99.85 2 -99.82 0.0004
2015-04-24 2015-03-31 13F AMBARELLA COM G037AX101 14,852 14,852 1,124 0.2782
2014-10-15 2014-09-30 13F AMBARELLA COM G037AX101 0 -8,397 -100.00 0 -100.00
2014-07-08 2014-06-30 13F AMBARELLA COM G037AX101 8,397 4,897 139.91 261 180.65 0.0413
2014-05-21 2014-03-31 13F AMBARELLA COM G037AX101 3,500 3,500 93 0.0219
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.