Exhibit 99 CONTACT: Mark J. Plush Vice President and Chief Financial Officer - -------------------------------------------------------------------------------- KEITHLEY KEITHLEY INSTRUMENTS, INC. 28775 Aurora Road Cleveland, Ohio 44139-1891 440-248-0400 o Fax: 440-248-6168 http://www.keithley.com FOR IMMEDIATE RELEASE KEITHLEY INSTRUMENTS RECORDS NON-CASH ADJUSTMENT TO INCOME TAX PROVISION Cleveland, Ohio - December 8, 2003 - Keithley Instruments, Inc. (NYSE:KEI), a leader in solutions for emerging measurement needs, announced a non-cash adjustment to income tax expense for its previously released results for the fourth quarter and fiscal year ended September 30, 2003. The Company's pretax results were not affected by the change. The Company and its independent accountants have reviewed the accounting treatment under Statement of Financial Accounting Standards No. 109, "Accounting for Income Taxes," related to a tax valuation reserve for certain tax credits that were generated as a result of the previous exercise of non-qualified stock options. In the November 3, 2003 earnings release, the valuation reserve was recorded as a charge against shareholders' equity. The appropriate accounting treatment is to charge the valuation reserve against the provision for income taxes. The adjustment does not affect previously reported sales, gross margins, or other components of pretax results or cash flows. The deferred tax assets valuation allowance is reviewed periodically for continued probability of realization as part of the Company's normal accounting processes. This may result in an increase or decrease in the deferred tax assets valuation allowance amount as future conditions dictate. The Company's previously released pretax income for the fourth quarter ended September 30, 2003 of $1.1 million remains unchanged, as does the reported pretax loss for the full fiscal year. However, the provision for income taxes is being increased by $1.7 million resulting in a net loss for the fourth quarter of $0.8 million, or $0.05 per share. For the full fiscal year, the revised net loss is $4.2 million, or $0.27 per share. This change does not affect any other previously reported periods. The Company is reporting this change before the filing of its fiscal year 2003 Annual Report on Form 10-K, which is due to be filed with the Securities and Exchange Commission on or before December 29, 2003. About Keithley Instruments. With more than 50 years of measurement expertise, Keithley Instruments has become a world leader in advanced electrical test instruments and systems from DC to RF (radio frequency) for semiconductor, wireless, optoelectronics, and other segments of the worldwide electronics industry. Engineers and scientists rely on Keithley's instrumentation to make even the most demanding electrical measurements with confidence. Keithley technology can be found on production floors of the most advanced electronics manufacturing facilities, in leading development labs, and in research departments of the world's prominent universities and corporate R&D centers. KEITHLEY INSTRUMENTS, INC. Consolidated Statement of Income (In Thousands of Dollars Except for Per Share Data) (Unaudited) FOR THE THREE MONTHS FOR THE FISCAL YEAR ENDED SEPTEMBER 30, ENDED SEPTEMBER 30, --------------------------------------- ----------------------------------------- 2003 2002 2003 2002 ------------------- ---------------- ------------------ ------------------- NET SALES $29,303 100.0% $28,423 100.0% $106,718 100.0% $96,922 100.0% Cost of goods sold 12,346 42.1 12,183 42.9 47,646 44.7 42,441 43.8 Selling, general and administrative expenses 12,149 41.5 12,130 42.7 49,534 46.4 45,056 46.5 Product development expenses 3,408 11.6 3,427 12.0 13,488 12.6 13,987 14.4 Severance charges 310 1.1 -- -- 845 0.8 1,461 1.5 Net financing income (51) (0.2) (212) (0.7) (434) (0.4) (977) (1.0) ------- ----- -------- ----- -------- ----- -------- ----- Income (loss) before income taxes 1,141 3.9 895 3.1 (4,361) (4.1) (5,046) (5.2) Income taxes (benefit) 1,977 6.7 143 0.5 (169) (0.2) (1,966) (2.0) ------ ----- ------ ---- -------- ----- --------- ----- NET (LOSS) INCOME $ (836) (2.8)% $ 752 2.6% $ (4,192) (3.9)% $ (3,080) (3.2)% ======= ====== ======= ===== ======= ===== ======= ===== Basic (loss) earnings per share $ (0.05) $ 0.05 $ (0.27) $ (0.20) ======= ======= ======= ======== Diluted (loss) earnings per share $ (0.05) $ 0.05 $ (0.27) $ (0.20) ======= ======= ====== ======== Cash dividends per Common Share $ .0375 $ .0375 $ .1500 $ .1500 ====== ====== ======== ======= Cash dividends per Class B Common Share $ .0300 $ .0300 $ .1200 $ .1200 ====== ====== ======== ======= Weighted average number of shares outstanding - Diluted (000) 15,501 16,175 15,487 15,687 ====== ====== ====== ====== KEITHLEY INSTRUMENTS, INC. Consolidated Balance Sheet (In Thousands of Dollars) (Unaudited) September 30, 2003 September 30, 2002 ------------------ ------------------ ASSETS Current assets: Cash and cash equivalents $ 15,739 $ 21,707 Short-term investments 20,070 28,171 Refundable income taxes 519 954 Accounts receivable and other, net of allowances 15,607 14,140 Inventory 11,214 10,112 Other current assets 5,111 5,095 -------- -------- Total current assets 68,260 80,179 Property, plant and equipment, net 14,301 13,808 Other assets 31,625 26,384 -------- -------- Total assets $114,186 $120,371 ======== ======== LIABILITIES AND SHAREHOLDERS' EQUITY Current liabilities: Accounts payable $ 7,071 $ 7,170 Other current liabilities 12,721 13,583 -------- -------- Total current liabilities 19,792 20,753 Long-term debt -- -- Other long-term liabilities 9,631 7,170 Shareholders' equity 84,763 92,448 -------- -------- Total liabilities and shareholders' equity $114,186 $120,371 ======== ========