SECURITIES AND EXCHANGE COMMISSION

Washington, DC 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16 OF

THE SECURITIES EXCHANGE ACT OF 1934

For the month of October, 2016

ChipMOS TECHNOLOGIES (Bermuda) LTD.

(Translation of Registrant’s Name Into English)

No. 1, R&D Rd. 1, Hsinchu Science Park

Hsinchu, Taiwan

Republic of China

(Address of Principal Executive Offices)

(Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.)

Form 20-F ☒ Form 40-F ☐

(Indicate by check mark whether the registrant by furnishing the information contained in this form is also thereby furnishing the information to the Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.)

Yes ☐ No ☒

(If “Yes” is marked, indicate below the file number assigned to the registrant in connection with Rule 12g3-2(b): 82- .)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Contacts:

In Taiwan Dr. S.K. Chen ChipMOS TECHNOLOGIES ~~(Bermuda) LTD~~INC. +886-6-507-7712 s.k._chen@chipmos.com In the U.S. David Pasquale Global IR Partners +1-914-337-8801 dpasquale@globalirpartners.com

~~UPDATE~~ALERT: ChipMOS BERMUDA ANNOUNCES COMPLETION OF MERGER ~~EXPECTED~~WITH TOAND ~~CLOSE~~INTO ~~OCTOBER~~ChipMOS 31TAIWAN

~~Hsinchu,~~• ~~Taiwan,~~Consolidation ~~October 20,~~Marks ~~2016~~Start ~~- ChipMOS TECHNOLOGIES (Bermuda) LTD. (“ChipMOS Bermuda” or “Company” or “IMOS”) (Nasdaq: IMOS) today announced it expects to close on October 31, 2016 the merger (the “Merger”)~~ of ~~ChipMOS~~New ~~Bermuda~~Era ~~with~~for ~~and~~Industry ~~into~~Leading ~~its~~OSAT ~~58.3% owned subsidiary ChipMOS TECHNOLOGIES INC. (“ChipMOS Taiwan”) (Taiwan Stock Exchange (“TWSE”): 8150).~~ Company

~~Pursuant~~• Company to ~~the~~Capitalize ~~previously~~on ~~announced~~Compelling ~~agreement~~Long-Term ~~and~~Growth ~~plan of merger~~Opportunities, ~~dated~~Cost ~~January 21,~~Savings ~~2016, by~~ and ~~between ChipMOS~~Financial ~~Bermuda~~Benefits ~~and~~Afforded ~~ChipMOS~~by ~~Taiwan~~Streamlined ~~(the “Merger Agreement”):~~ Structure

•Hsinchu, Taiwan, October 31, 2016 - ChipMOS ~~Taiwan~~TECHNOLOGIES ~~will~~(Bermuda) beLTD. (“ChipMOS Bermuda” or “IMOS”) (Nasdaq: IMOS) today announced the completion of the merger (the “Merger”) of ChipMOS Bermuda with and into its 58.3% owned subsidiary ChipMOS TECHNOLOGIES INC. (“ChipMOS Taiwan”) (Taiwan Stock Exchange: 8150), with ChipMOS Taiwan being the surviving company after the Merger, pursuant to the previously announced agreement and plan of merger, dated January 21, 2016, by and between ChipMOS Bermuda and ChipMOS Taiwan (the “Merger Agreement”).

•S.J. InCheng, ~~accordance~~Chairman ~~with~~and ~~the~~Chief ~~Merger~~Executive ~~Agreement~~Officer, atcommented, “Today marks the ~~effective~~official ~~time~~start of ~~the~~a ~~Merger~~new ~~(the~~era ~~“Effective~~for ~~Time”),~~our ~~each~~Company. ~~common~~We ~~share~~are ofmoving ~~IMOS~~forward, ~~par~~with overwhelmingly ~~value~~positive ~~US$0.04~~shareholder ~~per share (each~~support, anwith ~~“IMOS~~a ~~Share”,~~unified structure and ~~collectively,~~purpose – ready to capitalize on the ~~“IMOS~~compelling ~~Shares”)~~long-term growth opportunities, ~~issued~~cost savings and ~~outstanding~~financial ~~immediately~~benefits ~~prior~~afforded toby ~~the~~our ~~Effective~~streamlined ~~Time~~ownership structure. We expect this consolidation will behelp ~~cancelled~~investors inand ~~exchange~~financial ~~for~~analysts in the ~~right~~U.S. byand ~~each~~Asia ~~holder~~to ofmore ~~such~~appropriately ~~cancelled~~value ~~IMOS~~our ~~Shares~~company tobased ~~receive~~on our business profile, ~~with~~long-term ~~respect~~prospects and strategy, and to ~~each~~also ~~such~~more ~~IMOS~~appropriately ~~Share~~value our company relative to other public OSAT companies. We would like to thank the regulatory authorities in Taiwan, the U.S. and Bermuda for their efforts in this transaction and our shareholders for their continued support.”

•As ~~(i)~~a 0result of the merger, ChipMOS Taiwan will have approximately 856.~~9355~~9 million ~~American~~shares ~~depositary~~outstanding ~~share~~on ~~(each~~a fully diluted basis, awhich ~~“ChipMOS~~trade on the Taiwan Stock ~~ADS~~Exchange (“TWSE”,) ~~and~~under ~~collectively,~~ the ticker symbol “8150”. Former ChipMOS ~~Taiwan~~Bermuda ~~ADSs”)~~shareholders will own approximately 59.8%, ~~each~~and former ChipMOS Taiwan ~~ADS~~shareholders ~~representing~~will 20own ~~common~~approximately ~~shares~~40.2%. ofChipMOS Taiwan has obtained approval from NASDAQ to list the ChipMOS Taiwan ADSs to be issued in connection with the Merger on NASDAQ where, ~~par~~subject ~~value~~to ~~NT$10~~official ~~per~~notice ~~share~~of ~~(each~~issuance, acommencing ~~“ChipMOS~~on ~~Taiwan~~November 1, ~~Share”~~2016, they will trade under the ticker symbol “IMOS”. There will be approximately 25.6 million ADSs on a fully diluted basis. The Company is an industry leading provider of semiconductor assembly and ~~collectively~~test services, boasting one of the ~~“ChipMOS~~world’s largest LCD driver capacity footprints for packaging and testing, backed by advanced facilities in Hsinchu Science Park, Hsinchu Industrial Park and Southern Taiwan ~~Shares”)~~Science ~~(the~~Park ~~“Share~~in ~~Consideration”)~~Taiwan and Qingpu Industrial Zone in Shanghai. ChipMOS provides assembly and test services to a broad range of customers, including leading fabless semiconductor companies, integrated device manufacturers and independent semiconductor foundries.

•In accordance with the terms of the Merger Agreement, each common share of IMOS, par value US$0.04 per share (iieach, an “IMOS Share”, and collectively, the “IMOS Shares”), issued and outstanding immediately prior to the effective time of the Merger (the “Effective Time”) has been cancelled in exchange for the right by each former holder of such cancelled IMOS Shares (each, a “Former IMOS Shareholder”) to receive, with respect to each such IMOS Share, (i) 0.9355 American depositary share (each, a “ChipMOS Taiwan ADS”, and collectively, the “ChipMOS Taiwan ADSs”), each ChipMOS Taiwan ADS representing 20 common shares of ChipMOS Taiwan, par value NT$10 per share (each, a “ChipMOS Taiwan Share”, and collectively, the “ChipMOS Taiwan Shares”) (the “Share Consideration”), and (ii) US$3.71 in cash, without interest, net of any applicable withholding tax (the “Cash Consideration” and together with the Share Consideration and any cash- in- lieu ~~payment~~ of any fractional ChipMOS Taiwan ADS entitlement (the “Cash-in-Lieu Payment”), the “Merger Consideration”). The entitlement to any Cash-in-Lieu Payment will be determined on the basis of US$17.69 per ChipMOS Taiwan ADS.

~~Trading~~Former isIMOS ~~expected~~Shareholders toholding becertificates ~~suspended~~representing in the ~~common~~cancelled ~~shares~~IMOS ofShares ~~ChipMOS~~will ~~Bermuda~~receive onfrom ~~the NASDAQ~~Citibank, ~~Capital~~N.A. ~~Market~~ (“~~NASDAQ~~Citibank”), as ofexchange ~~4:00~~agent ~~p.m.~~for ~~(New~~the ~~York~~Merger ~~time)~~and onas ~~Friday,~~depositary ~~October 28,~~for ~~2016.~~ChipMOS ~~NASDAQ~~Taiwan ~~notification~~ADSs, toa ~~the~~letter ~~U.S.~~of ~~Securities~~transmittal and ~~Exchange~~instructions ~~Commission~~on ~~(the~~how ~~“SEC”)~~to surrender their cancelled IMOS Shares in exchange for the ~~delisting~~Merger ofConsideration ~~IMOS’s~~and ~~registered~~should wait ~~securities~~to ~~is expected~~receive onthe ~~Monday,~~letter ~~October 31,~~of ~~2016.~~transmittal ~~ChipMOS~~before ~~Bermuda~~surrendering ~~intends~~their tocancelled ~~terminate~~IMOS ~~its~~Shares. ~~reporting~~Former ~~obligations~~IMOS ~~under~~Shareholders holding the ~~Securities~~cancelled ~~Exchange~~IMOS ~~Act~~Shares ofin ~~1934,~~uncertificated asform ~~amended,~~will byreceive ~~promptly~~from ~~filing~~Citibank a ~~Form~~statement 15reflecting ~~with~~ChipMOS ~~the~~Taiwan ~~SEC~~ADSs ~~after~~issued in ~~the~~such ~~closing~~Former IMOS Shareholder’s name as a result of the Merger. ~~ChipMOS Bermuda’s~~and ~~obligation~~a tocheck ~~file~~for ~~with~~ the ~~SEC~~net ~~certain~~Cash ~~reports~~Consideration and ~~forms,~~Cash-in-Lieu ~~including~~Payment ~~Form~~to ~~20-F~~which ~~and~~such ~~Form~~Former ~~6-K,~~IMOS ~~will~~Shareholder beis ~~suspended~~entitled as a result of the ~~filing~~Merger. ~~date~~Payment of the ~~Form~~Merger Consideration 15will ~~and~~be ~~will~~made ~~cease~~to ~~once~~Former IMOS Shareholders as soon as practicable after Citibank receives from ChipMOS Taiwan the ~~deregistration~~aggregate ~~becomes~~Merger ~~effective~~Consideration.

Trading of IMOS Shares on the ~~to-be-issued~~NASDAQ ~~ChipMOS~~Capital ~~Taiwan~~Market ~~ADSs~~(“NASDAQ”) isceased ~~expected~~as toof ~~commence~~4:00 p.m. (New York time) on October 28, 2016. IMOS also requested that NASDAQ ~~under~~file as of 9:00 a.m. (New York time) on October 31, 2016 a Form 25 with the ~~ticker~~Securities ~~symbol~~and Exchange Commission (the “~~IMOS~~SEC”) onnotifying ~~Tuesday~~the SEC of the delisting of IMOS Shares from NASDAQ and the deregistration of IMOS’s registered securities. The deregistration will become effective 90 days after the filing of Form 25 or such shorter period as may be determined by the SEC. ChipMOS Bermuda intends to terminate its reporting obligations under the Securities Exchange Act of 1934, ~~November 1~~as amended, ~~2016~~by filing a Form 15 with the SEC within ten days of the Effective Time. The Company’s obligation to file with the SEC certain reports and forms, including Form 20-F and Form 6-K, will be suspended immediately as of the filing date of the Form 15 and will cease once the deregistration becomes effective.

ChipMOS Taiwan ~~Shares~~expects ~~will~~to ~~continue~~report tofinancial ~~trade~~results for the third quarter of 2016 at 6:00 a.m. on Thursday, November 10, 2016 before the ~~TWSE~~NASDAQ ~~under~~open (New York time). ChipMOS Taiwan has obtained approval from NASDAQ to list the ~~current~~ChipMOS Taiwan ADSs to be issued in connection with the Merger on NASDAQ where, subject to official notice of issuance, commencing on November 1, 2016, they will trade under the ticker symbol “~~8150~~IMOS.”

The Company expects to report financial results for the third quarter of 2016 on Thursday, November 10, 2016 before the NASDAQ open (New York time).

This press release is not an offering of securities for sale in any jurisdiction:

ChipMOS Taiwan filed a registration statement on Form F-4 with the SEC in connection with the ~~merger~~Merger. The Form F-4 contains a prospectus, proxy statement for the ~~merger~~Merger and other documents. In addition, certain participants in the ~~merger~~Merger filed with the SEC a Schedule 13E-3 transaction statement. These documents contain important information about ChipMOS Taiwan and ChipMOS Bermuda, the ~~merger~~Merger and related matters, including the terms and conditions of the transaction. Former IMOS ~~Shares~~Shareholders ~~holders~~ are urged to carefully read these documents. The Form F-4, prospectus, proxy statement, Schedule 13E-3 and all other documents filed with the SEC in connection with the ~~merger~~Merger are available, free of charge, on the SEC’s website at www.sec.gov and in the SEC section of the ChipMOS Investor Relations website at www.chipmos.com. In addition, these documents will be made available, free of charge, to ~~IMOS~~ ~~Shares~~Former ~~holders~~IMOS Shareholders who make a written request to irene_tsai@chipmos.com.

This announcement is neither a solicitation of a proxy, an offer to purchase nor a solicitation of an offer to sell any securities and it is not a substitute for any filings made with the SEC.

About ChipMOS TECHNOLOGIES (Bermuda) LTD.:

ChipMOS ~~TECHNOLOGIES (~~Bermuda) ~~LTD.~~ (~~“ChipMOS Bermuda” or the “Company”) (~~NASDAQ: IMOS) (http://www.chipmos.com) isprior anto ~~industry~~completion ~~leading provider~~ of ~~semiconductor~~the ~~assembly~~Merger ~~and~~has ~~test~~been ~~services.~~an ~~With~~industry ~~advanced~~leading ~~facilities~~provider inof ~~Hsinchu~~semiconductor ~~Science Park, Hsinchu Industrial Park and Southern Taiwan Science Park in Taiwan and Qinpu Industrial Zone in Shanghai, ChipMOS Bermuda and its subsidiaries provide~~ assembly and test services ~~to a broad range of customers, including leading fabless semiconductor companies, integrated device manufacturers and independent semiconductor foundries~~.

About ChipMOS TECHNOLOGIES INC.:

ChipMOS TECHNOLOGIES INC. (“ChipMOS Taiwan”) (Taiwan Stock Exchange: 8150), was established in August 1997 and is an industry leading provider of semiconductor assembly and test services. ChipMOS Taiwan is a leader in Taiwan’s IC packaging and testing industry and has one of the world’s largest LCD driver capacity footprints for packaging and testing. With advanced facilities in Hsinchu Science Park, Hsinchu Industrial Park and Southern Taiwan Science Park in Taiwan and Qingpu Industrial Zone in Shanghai, ChipMOS Taiwan and its subsidiaries provide assembly and test services to a broad range of customers, including leading fabless semiconductor companies, integrated device manufacturers and independent semiconductor foundries. For more details, please refer to ChipMOS Taiwan’s website http://www.chipmos.com.tw.

Forward-Looking Statements

~~Certain~~This ~~statements~~press ~~contained~~release incontains ~~this~~certain ~~announcement~~forward-looking ~~may~~statements. beThese ~~viewed as “~~forward-looking statements” ~~within~~may ~~the~~be ~~meaning~~identified ofby ~~Section 27A~~words ofsuch ~~the~~as ~~U.S.~~‘believes,’ ~~Securities~~‘expects,’ ~~Act~~‘anticipates,’ of‘projects,’ ~~1933~~‘intends,’ as‘should,’ ~~amended~~‘seeks,’ ~~and~~‘estimates,’ ~~Section 21E~~‘future’ ofor ~~the~~similar ~~U.S.~~expressions ~~Securities~~or ~~Exchange~~by ~~Act~~discussion of, ~~1934~~among other things, asstrategy, goals, ~~amended.~~plans ~~Such~~or ~~forward-looking~~intentions. These statements ~~involve~~include ~~known~~financial projections and ~~unknown~~estimates ~~risks, uncertainties~~ and ~~other~~their ~~factors~~underlying assumptions, ~~which~~statements ~~may~~regarding ~~cause~~plans, ~~the~~objectives ~~actual performance,~~and ~~financial~~expectations ~~condition~~with orrespect ~~results~~to offuture operations, ofproducts ~~the~~and ~~Company~~services, toand statements beregarding ~~materially~~future ~~different~~performance. ~~from~~Actual ~~any~~results ~~future~~may ~~performance,~~differ ~~financial~~materially ~~condition~~in orthe ~~results~~future offrom ~~operations~~those ~~implied~~reflected byin ~~such~~ forward-looking statements. ~~Further~~contained ~~information~~in ~~regarding these~~this ~~risks~~document, ~~uncertainties~~due ~~and~~to ~~other~~various factors. isThese ~~included~~risks inand ~~the~~uncertainties ~~Company’s~~include ~~most~~those ~~recent~~discussed under ~~Annual~~“Cautionary ~~Report~~Statement onConcerning ~~Form~~Forward ~~20-F~~Looking ~~filed~~Statements” ~~with the U.S. Securities~~ and ~~Exchange Commission (the~~ “~~SEC~~Risk Factors”) ~~and~~ in the ~~Company’s~~prospectus ~~other~~included ~~filings~~in ~~with~~ the ~~SEC, including~~registration ~~the~~statement ~~Schedule~~on ~~13E~~Form F-34 ~~transaction~~that ~~statement~~ChipMOS ~~and~~Taiwan ~~the proxy statement~~ filed bywith the ~~Company~~U.S. SEC.

ChipMOS TECHNOLOGIES (Bermuda) LTD.

(Registrant)

Date: October 20, 2016

/S/ S. J. Cheng

Date: October 31, 2016

/S/ S. J. Cheng

Name: S. J. Cheng

Title: Chairman & Chief Executive Officer

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