KEITHLEY INSTRUMENTS INC

Annual Report for period ending 2010-09-30

Notice under Rule 12b25 of inability to timely file all or part of a Form 10-K, 10-KSB, or 10-KT for period ending 2010-09-30

Quarterly Report for period ending 2010-06-30

Quarterly Report for period ending 2010-03-31

Quarterly Report for period ending 2009-12-31

Annual Report for period ending 2009-09-30

Quarterly Report for period ending 2009-06-30

Quarterly Report for period ending 2009-03-31

Quarterly Report for period ending 2008-12-31

Annual Report for period ending 2008-09-30

Current report filing

Current report filing

Current report filing

Current report filing

Current report filing

Current report filing

Current report filing

Current report filing

Current report filing

Current report filing

Notice of termination of registration of a class of securities under Section 12(b)

Notification filed by national security exchange to report the removal from listing and registration of matured, redeemed or retired securities

Annual report of employee stock purchase, savings and similar plans

Annual report to security holders

Annual report of employee stock purchase, savings and similar plans

A correspondence can be sent as a document with another submission type or can be sent as a separate submission.

A correspondence can be sent as a document with another submission type or can be sent as a separate submission.

Annual report of employee stock purchase, savings and similar plans

Annual report of employee stock purchase, savings and similar plans

Annual report of employee stock purchase, savings and similar plans

HOERSTEN MARK A: Statement of changes in beneficial ownership of securities

Faia Daniel A: Statement of changes in beneficial ownership of securities

JACKMAN BRIAN J: Statement of changes in beneficial ownership of securities

PENDERGRASS LARRY L: Statement of changes in beneficial ownership of securities

BACHMAN BRIAN R: Statement of changes in beneficial ownership of securities

GRISWOLD JAMES B: Statement of changes in beneficial ownership of securities

SCHERER BARBARA VAUGHN: Statement of changes in beneficial ownership of securities

SAPONAS THOMAS A: Statement of changes in beneficial ownership of securities

GAMCO INVESTORS, INC. ET AL: Major Shareholders

KEITHLEY JOSEPH P: Major Shareholders

Post-effective amendment to a S-8 registration statement

Post-effective amendment to a S-8 registration statement

Post-effective amendment to a S-8 registration statement

Post-effective amendment to a S-8 registration statement

Post-effective amendment to a S-8 registration statement

Post-effective amendment to a S-8 registration statement

Post-effective amendment to a S-8 registration statement

Post-effective amendment to a S-8 registration statement

Post-effective amendment to a S-8 registration statement

Initial registration statement for securities to be offered to employees pursuant to employee benefit plans

Definitive additional proxy soliciting materials including Rule 14(a)(12) material. Note: Submission type DEFA14A can be filed as part of Form 8-K. For filers subject to 8-K filing requirements, we recommend the use of the 8-K combined form type as the easiest method for fulfilling your filing requirement for both forms.

Definitive additional proxy soliciting materials including Rule 14(a)(12) material. Note: Submission type DEFA14A can be filed as part of Form 8-K. For filers subject to 8-K filing requirements, we recommend the use of the 8-K combined form type as the easiest method for fulfilling your filing requirement for both forms.

Definitive additional proxy soliciting materials including Rule 14(a)(12) material. Note: Submission type DEFA14A can be filed as part of Form 8-K. For filers subject to 8-K filing requirements, we recommend the use of the 8-K combined form type as the easiest method for fulfilling your filing requirement for both forms.

Definitive proxy statement relating to a merger, acquisition, or disposition

Definitive additional proxy soliciting materials including Rule 14(a)(12) material. Note: Submission type DEFA14A can be filed as part of Form 8-K. For filers subject to 8-K filing requirements, we recommend the use of the 8-K combined form type as the easiest method for fulfilling your filing requirement for both forms.

Preliminary proxy statement relating to a merger, acquisition, or disposition

Definitive additional proxy soliciting materials including Rule 14(a)(12) material. Note: Submission type DEFA14A can be filed as part of Form 8-K. For filers subject to 8-K filing requirements, we recommend the use of the 8-K combined form type as the easiest method for fulfilling your filing requirement for both forms.

Definitive proxy statements

Definitive proxy statements

Definitive proxy statements