ChipMOS REPORTS SEPTEMBER 2022 AND 3Q22 QUARTERLY REVENUE

HSINCHU,Taiwan,Oct. 7,2022 -- 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 its unaudited consolidated revenue for the month of September 2022 and for the third quarter ended September 30,2022. All U.S. dollar figures cited in this press release are based on the exchange rate of NT$31.78 to US$1.00 as of September 30,2022.

Revenue for thethird quarter of 2022 was NT$5,254.0 million or US$165.3 million,representing a decrease of23.3%from the secondquarter of 2022,and a decrease of 26.6%fromthe third quarter of 2021.

Revenue for the month of September2022was NT$1,590.9million or US$50.1million,representing a decreaseof7.2% fromAugust2022,and a decreaseof32.1%fromSeptember2021.

The Company noted that while its long-term business catalysts remain firmly in place,the decline in its monthly and year-over-year revenue reflects broader end market conditions and ongoing inventory adjustments in response to end market demand levels,which are impacting the entire industry.

Consolidated Monthly Revenues (Unaudited)

September 2022

August 2022

September 2021

MoM Change

YoY Change

Revenues

(NT$ million)

1,590.9

1,715.1

2,343.8

-7.2%

-32.1%

Revenues

(US$ million)

50.1

54.0

73.8

-7.2%

-32.1%

Consolidated Quarterly Revenues (Unaudited)

Third Quarter

2022

Second Quarter

2022

Third Quarter

2021

QoQ Change

YoY Change

Revenues

(NT$ million)

5,254.0

6,851.7

7,161.0

-23.3%

-26.6%

Revenues

(US$ million)

165.3

215.6

225.3

-23.3%

-26.6%

About ChipMOS TECHNOLOGIES INC.:

ChipMOS TECHNOLOGIES INC. ("ChipMOS" or the "Company") (Taiwan Stock Exchange: 8150 and NASDAQ: IMOS) (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 is known for its track record of excellence and history of innovation. The Company provides end-to-end assembly and test services to leading fabless semiconductor companies,integrated device manufacturers and independent semiconductor foundries serving virtually all end markets worldwide.

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,strategies,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. 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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