ONTO INNOVATION INC.

Revenue by geographic region is as follows: Three Months Ended March 30 April 1, 2024 2023 Revenue from third parties: South Korea $ 80,239 $ 45,473 Taiwan 71,103 26,705 China 20,994 36,551 United States 20,868 40,713 Southeast Asia 16,078 17,301 Japan 13,335 14,504 Europe 6,229 17,918 Total revenue $ 228,846 $ 199,165 The following customers accounted for 10% or more of total revenue for the indicated periods: Three Months Ended March 30, April 1, 2024 2023 Samsung Semiconductor 26 % 20 % Taiwan Semiconductor Manufacturing Co. Ltd. 26 % 14 % SK Hynix Inc. 12 % 2 %

Revenue by geographic region is as follows: Year Ended December 30, 2023 December 31, 2022 January 1, 2022 Revenue from third parties: South Korea $ 169,323 $ 224,172 $ 160,373 Taiwan 141,915 199,104 194,458 China 136,940 250,968 151,027 United States 130,292 121,487 123,858 Japan 93,831 58,133 61,186 Southeast Asia 87,585 71,062 33,054 Europe 55,982 80,256 64,943 Total revenue $ 815,868 $ 1,005,183 $ 788,899 The following chart identifies our customers that represented 10% or more of total revenue for each of the last three fiscal years: 2023 2022 2021 Samsung Semiconductor 19 % 13 % 16 % Taiwan Semiconductor Manufacturing Co. Ltd. 14 % 15 % 18 % SK Hynix Inc. ^ 11 % ^ ^ The customer accounted for less than 10% of total revenue during the period.

Revenue by geographic region is as follows: Three Months Ended April 1, April 2, 2023 2022 Revenue from third parties: South Korea $ 45,473 $ 61,135 United States 40,713 26,801 China 36,551 63,394 Taiwan 26,705 53,392 Europe 17,918 18,428 Southeast Asia 17,301 9,225 Japan 14,504 8,975 Total revenue $ 199,165 $ 241,350 The following customers accounted for 10% or more of total revenue for the indicated periods: Three Months Ended April 1, April 2, 2023 2022 Samsung Semiconductor 20 % 10 % Taiwan Semiconductor Manufacturing Co. Ltd. 14 % 16 % SK Hynix Inc. 2 % 19 %

Taiwan Semiconductor Manufacturing Co. Ltd. 16 % 13 %

Revenue by geographic region is as follows: Year Ended December 31, 2022 January 1, 2022 December 26, 2020 Revenue from third parties: China $ 250,968 $ 151,027 $ 125,023 South Korea 224,172 160,373 90,193 Taiwan 199,104 194,458 120,959 United States 121,487 123,858 81,708 Europe 80,256 64,943 49,697 Japan 58,133 61,186 59,295 Southeast Asia 71,062 33,054 29,621 Total revenue $ 1,005,183 $ 788,899 $ 556,496 The following chart identifies our customers that represented 10% or more of total revenue for each of the last three fiscal years: 2022 2021 2020 Taiwan Semiconductor Manufacturing Co. Ltd. 15 % 18 % 14 % Samsung Semiconductor 13 % 16 % 15 % SK Hynix Inc. 11 % ^ ^ ^ The customer accounted for less than 10% of total revenue during the period.

Taiwan Semiconductor Manufacturing Co. Ltd. 13 % 17 %

Taiwan Semiconductor Manufacturing Co. Ltd. 18 % 14 % 13 %

With respect to customer concentration, SK hynix, Intel Corporation, Toshiba Memory Corporation, Taiwan Semiconductor Manufacturing Company, and Samsung Electronics Co. Ltd. each accounted for more than 10% of total sales for the three months ended September 28, 2019, and SK hynix, Intel Corporation, Taiwan Semiconductor Manufacturing Company Limited, and Samsung Electronics Co. Ltd. each accounted for more than 10% of total sales for the nine months ended September 28, 2019.

Samsung Electronics Co. Ltd, SK Hynix, Taiwan Semiconductor Manufacturing Company Limited and Intel Corporation each accounted for more than 10% of total sales for the three months ended April 1, 2017.

With respect to customer concentration, Samsung Electronics Co. Ltd., SK hynix, Toshiba Corporation, and Intel Corporation each accounted for more than 10% of total sales for the year ended December 29, 2018, and Samsung Electronics Co. Ltd., SK hynix, Micron Technology, Inc., Intel Corporation, and Toshiba Corporation each accounted for more than 10% of total sales for the year ended December 30, 2017, and Micron Technology, Inc., Intel Corporation, SK hynix, and Taiwan Semiconductor Manufacturing Company Limited each accounted for more than 10% of total sales for the year ended December 31, 2016.

Taiwan Semiconductor Manufacturing Company Limited 16.7% 10.1%

Taiwan Semiconductor Manufacturing Company Limited *** 10% 19%

Taiwan Semiconductor Manufacturing Company Limited *** 17.0 % *** 19.0 %

Taiwan Semiconductor Manufacturing Company Limited *** 17.0 % *** 20.0 %

Taiwan Semiconductor Manufacturing Company Limited 20.1 % 25.6 % 20.2 %

With respect to customer concentration, SK hynix, Intel Corporation, Toshiba Memory Corporation, Taiwan Semiconductor Manufacturing Company, and Samsung Electronics Co. Ltd. each accounted for more than 10% of total sales for the three months ended September 28, 2019, and SK hynix, Intel Corporation, Taiwan Semiconductor Manufacturing Company Limited, and Samsung Electronics Co. Ltd. each accounted for more than 10% of total sales for the nine months ended September 28, 2019.

With respect to customer concentration, SK hynix, Intel and Taiwan Semiconductor each accounted for more than 10% of total sales for the three months ended March 30, 2019, and Samsung Electronics Co. Ltd., SK hynix, Micron Technology, Inc., and Toshiba Memory Corporation each accounted for more than 10% of total sales for the three months ended March 31, 2018.

With respect to customer concentration, Samsung Electronics Co. Ltd., SK hynix, Toshiba Corporation, and Intel Corporation each accounted for more than 10% of total sales for the year ended December 29, 2018, and Samsung Electronics Co. Ltd., SK hynix, Micron Technology, Inc., Intel Corporation, and Toshiba Corporation each accounted for more than 10% of total sales for the year ended December 30, 2017, and Micron Technology, Inc., Intel Corporation, SK hynix, and Taiwan Semiconductor Manufacturing Company Limited each accounted for more than 10% of total sales for the year ended December 31, 2016.

With respect to customer concentration, Micron Technology, Inc., SK hynix, and Yangtze Memory Technologies Co. Ltd. each accounted for more than 10% of total sales for the three months ended June 29, 2019, and Intel Corporation, SK hynix, and Taiwan Semiconductor Manufacturing Company Limited each accounted for more than 10% of total sales for the six months ended June 29, 2019.

Samsung Electronics Co. Ltd., Micron Technology, Inc., and Intel Corporation each accounted for more than 10% of total accounts receivable as of December 30, 2017.

Samsung Electronics Co. Ltd, SK Hynix, Taiwan Semiconductor Manufacturing Company Limited and Intel Corporation each accounted for more than 10% of total sales for the three months ended April 1, 2017.

Intel Corporation 14% 19% 12% 19%

Intel Corporation *** 24% 11% 20%

Intel Corporation 15.6% 15.7%

Intel Corporation 18.0% *** 12.6%

With respect to customer concentration, Micron Technology, Inc., SK hynix, and Yangtze Memory Technologies Co. Ltd. each accounted for more than 10% of total sales for the three months ended June 29, 2019, and Intel Corporation, SK hynix, and Taiwan Semiconductor Manufacturing Company Limited each accounted for more than 10% of total sales for the six months ended June 29, 2019.

With respect to customer concentration, SK hynix, Intel and Taiwan Semiconductor each accounted for more than 10% of total sales for the three months ended March 30, 2019, and Samsung Electronics Co. Ltd., SK hynix, Micron Technology, Inc., and Toshiba Memory Corporation each accounted for more than 10% of total sales for the three months ended March 31, 2018.

With respect to customer concentration, Samsung Electronics Co. Ltd., SK hynix, Toshiba Corporation, and Intel Corporation each accounted for more than 10% of total sales for the year ended December 29, 2018, and Samsung Electronics Co. Ltd., SK hynix, Micron Technology, Inc., Intel Corporation, and Toshiba Corporation each accounted for more than 10% of total sales for the year ended December 30, 2017, and Micron Technology, Inc., Intel Corporation, SK hynix, and Taiwan Semiconductor Manufacturing Company Limited each accounted for more than 10% of total sales for the year ended December 31, 2016.

Samsung Electronics Co. Ltd., Micron Technology, Inc., and Intel Corporation each accounted for more than 10% of total accounts receivable as of December 30, 2017.

Micron Technology, Inc. 19% 15% 11% 25%

Micron Technology, Inc. *** 36% *** 31%

Micron Technology, Inc. *** 25.9%

Micron Technology, Inc. 12% 20% 16%

Micron 14.6 % 14.0 % 25.2 % 18.0 %

Micron 35.9 % 32.0 % 31.3 % 19.0 %

Micron Technology, Inc. 20.3% 15.8% 10.4%

With respect to customer concentration, SK hynix, Intel Corporation, Toshiba Memory Corporation, Taiwan Semiconductor Manufacturing Company, and Samsung Electronics Co. Ltd. each accounted for more than 10% of total sales for the three months ended September 28, 2019, and SK hynix, Intel Corporation, Taiwan Semiconductor Manufacturing Company Limited, and Samsung Electronics Co. Ltd. each accounted for more than 10% of total sales for the nine months ended September 28, 2019.

With respect to customer concentration, Micron Technology, Inc., SK hynix, and Yangtze Memory Technologies Co. Ltd. each accounted for more than 10% of total sales for the three months ended June 29, 2019, and Intel Corporation, SK hynix, and Taiwan Semiconductor Manufacturing Company Limited each accounted for more than 10% of total sales for the six months ended June 29, 2019.

With respect to customer concentration, SK hynix, Intel and Taiwan Semiconductor each accounted for more than 10% of total sales for the three months ended March 30, 2019, and Samsung Electronics Co. Ltd., SK hynix, Micron Technology, Inc., and Toshiba Memory Corporation each accounted for more than 10% of total sales for the three months ended March 31, 2018.

With respect to customer concentration, Samsung Electronics Co. Ltd., SK hynix, Toshiba Corporation, and Intel Corporation each accounted for more than 10% of total sales for the year ended December 29, 2018, and Samsung Electronics Co. Ltd., SK hynix, Micron Technology, Inc., Intel Corporation, and Toshiba Corporation each accounted for more than 10% of total sales for the year ended December 30, 2017, and Micron Technology, Inc., Intel Corporation, SK hynix, and Taiwan Semiconductor Manufacturing Company Limited each accounted for more than 10% of total sales for the year ended December 31, 2016.

With respect to customer concentration, Samsung Electronics Co. Ltd., Yangtze Memory Technologies Co. Ltd., Intel Corporation, and Toshiba Corporation each accounted for more than 10% of total sales for the three months ended June 30, 2018, and Samsung Electronics Co. Ltd., SK Hynix, Toshiba Corporation, Yangtze Memory Technologies CO.

With respect to customer concentration, Samsung Electronics Co. Ltd, SK Hynix, Micron Technology, Inc. and Toshiba Corporation each accounted for more than 10% of total sales for the three months ended March 31, 2018.

SK Hynix *** 19% 15% 14%

SK Hynix 13.6% 16.7%

SK Hynix 13% 15% 11%

SK Hynix 18.8 % 15.0 % 14.0 % 13.0 %

SK Hynix *** 10.0 % *** 12.0 %

SK Hynix 16.7 % 13.4 %

SK Hynix 15.3% 10.7% 12.2%

With respect to customer concentration, Samsung Electronics Co. Ltd., SK hynix, Toshiba Corporation, and Intel Corporation each accounted for more than 10% of total sales for the year ended December 29, 2018, and Samsung Electronics Co. Ltd., SK hynix, Micron Technology, Inc., Intel Corporation, and Toshiba Corporation each accounted for more than 10% of total sales for the year ended December 30, 2017, and Micron Technology, Inc., Intel Corporation, SK hynix, and Taiwan Semiconductor Manufacturing Company Limited each accounted for more than 10% of total sales for the year ended December 31, 2016.

With respect to accounts receivable concentration, Toshiba Corporation and SK Hynix each accounted for more than 10% of total accounts receivable as of September 29, 2018.

With respect to customer concentration, Samsung Electronics Co. Ltd., Yangtze Memory Technologies Co. Ltd., Intel Corporation, and Toshiba Corporation each accounted for more than 10% of total sales for the three months ended June 30, 2018, and Samsung Electronics Co. Ltd., SK Hynix, Toshiba Corporation, Yangtze Memory Technologies CO.

With respect to customer concentration, Samsung Electronics Co. Ltd, SK Hynix, Micron Technology, Inc. and Toshiba Corporation each accounted for more than 10% of total sales for the three months ended March 31, 2018.

Toshiba Corporation 11% *** 10%

Toshiba Corporation *** 11.9%

Toshiba Corporation *** 13.0 % *** ***

With respect to customer concentration, SK hynix, Intel Corporation, Toshiba Memory Corporation, Taiwan Semiconductor Manufacturing Company, and Samsung Electronics Co. Ltd. each accounted for more than 10% of total sales for the three months ended September 28, 2019, and SK hynix, Intel Corporation, Taiwan Semiconductor Manufacturing Company Limited, and Samsung Electronics Co. Ltd. each accounted for more than 10% of total sales for the nine months ended September 28, 2019.

Intel Corporation, Samsung Electronics Co. Ltd., Toshiba Memory Corporation, and Yangtze Memory Technologies Co. Ltd. each accounted for more than 10% of total sales for the three months ended June 30, 2018.

With respect to customer concentration, SK hynix, Intel and Taiwan Semiconductor each accounted for more than 10% of total sales for the three months ended March 30, 2019, and Samsung Electronics Co. Ltd., SK hynix, Micron Technology, Inc., and Toshiba Memory Corporation each accounted for more than 10% of total sales for the three months ended March 31, 2018.

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