UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549
FORM 6-K
REPORT
OF FOREIGN PRIVATE ISSUER PURSUANT TO RULE 13a-16 OR 15d-16 UNDER
THE SECURITIES EXCHANGE
ACT OF 1934
For the month of May, 2011.
Commission File Number: 000-30540
GIGAMEDIA LIMITED
8th Floor, 207 Tiding Boulevard, Section 2, Taipei 114, Taiwan, R.O.C.
Tel: 886-2-2656-8000; Fax: 886-2-2656-8003
(Address of principal executive office)
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 þ Form 40-F o
Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by
Regulation S-T Rule 101(b)(1):o
Note: Regulation S-T Rule 101(b)(1) only permits the submission in paper of a Form 6-K if submitted
solely to provide an attached annual report to security holders.
Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by
Regulation S-T Rule 101(b)(7):o
Note: Regulation S-T Rule 101(b)(7) only permits the submission in paper of a Form 6-K if submitted
to furnish a report or other document that the registrant foreign private issuer must furnish and
make public under the laws of the jurisdiction in which the registrant is incorporated, domiciled
or legally organized (the registrants home country), or under the rules of the home country
exchange on which the registrants securities are traded, as long as the report or other document
is not a press release, is not required to be and has not been distributed to the registrants
security holders, and, if discussing a material event, has already been the subject of a Form 6-K
submission or other Commission filing on EDGAR.