ChipMOS REPORTS 19.1% YoY INCREASE IN FY21 REVENUE; 3.4% YoY INCREASE IN DECEMBER 2021 MONTHLY REVENUE; 7.6% YoY INCREASE IN 4Q21 QUARTERLY REVENUE

HSINCHU,Jan. 10,2022 -- ChipMOS TECHNOLOGIES INC. ("ChipMOS"or the "Company") (Taiwan Stock Exchange:8150 and NASDAQ: IMOS),an industry leading provider of outsourced semiconductor assembly and test services ("OSAT"),today reported a 19.1% year over year increase in revenue for the full year ended December 31,2021,compared to the full year ended December 31,2020. All U.S. dollar figures cited in this press release are based on the exchange rate of NT$27.74 toUS$1.00 as ofDecember 30,2021.

Revenue for the full year ended December 31,2021 increased 19.1% on a year over year basis to NT$27,400.0million or US$987.7 million,as compared to NT$23,011.4million or US$829.5 million for the full year ended December 31,2020. Full year 2021 revenue represents a new record high for the Company,reflecting the addition of incremental capacity to meet higher aggregate demand levels,and the benefit of stable higher utilization levels across its DDIC high-end test and memory platforms.

Revenue for thefourth quarter of 2021 increased 7.6% on a year over year basis to NT$6,791.4 million or US$244.8 million,representing a decrease of5.2%from the thirdquarter of 2021.

Revenue for the month of December 2021increased 3.4% on a year over year basis to NT$2.265.5million or US$81.7 million,representing an increaseof1.3% compared to November 2021.

Consolidated Monthly Revenues (Unaudited)

December2021

November 2021

December2020

MoM Change

YoY Change

Revenues

(NT$ million)

2,265.5

2,236.5

2,190.6

1.3%

3.4%

Revenues

(US$ million)

81.7

80.6

79.0

1.3%

3.4%

Consolidated Quarterly Revenues (Unaudited)

Fourth Quarter

2021

Third Quarter

2021

Fourth Quarter

2020

QoQ Change

YoY Change

Revenues

(NT$ million)

6,791.4

7,161.0

6,310.3

-5.2%

7.6%

Revenues

(US$ million)

244.8

258.1

227.5

-5.2%

7.6%

About ChipMOS TECHNOLOGIES INC.:

ChipMOS TECHNOLOGIES INC.("ChipMOS"or the "Company")(Taiwan Stock Exchange: 8150 and NASDAQ: IMOS) (https://www.chipmos.com) is an industry leading provider of outsourced semiconductor assembly and test services. With advanced facilities in Hsinchu Science Park,Hsinchu Industrial Park and Southern Taiwan Science Park in Taiwan,ChipMOS provide assembly and test services to a broad range of customers,including leading fabless semiconductor companies,integrated device manufacturers and independent semiconductor foundries.

Forward-Looking Statements

This press release may contain certain forward-looking statements. These forward-looking statements may be identified by words such as 'believes,' 'expects,' 'anticipates,' 'projects,' 'intends,' 'should,' 'seeks,' 'estimates,' 'future' or similar expressions or by discussion of,among other things,strategy,goals,plans or intentions. These statements may include financial projections and estimates and their underlying assumptions,statements regarding plans,objectives and expectations with respect to future operations,products and services,and statements regarding future performance. Actual results may differ materially in the future from those reflected in forward-looking statements contained in this document,due to various factors,including the ongoingimpact of COVID-19. Further information regarding these risks,uncertainties and other factors are included in the Company's most recent Annual Report on Form 20-F filed with the U.S. Securities and Exchange commission (the "SEC") and in the Company's other filings with the SEC.

Contacts:

In Taiwan

Jesse Huang

ChipMOS TECHNOLOGIES INC.

+886-6-5052388 ext. 7715

IR@chipmos.com

In the U.S.

David Pasquale

Global IR Partners

+1-914-337-8801

dpasquale@globalirpartners.com

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