Exhibit 11 NAI TECHNOLOGIES, INC. AND SUBSIDIARIES (In thousands) - ----------------------------------------------------------------------------------------------------- Three Months Ended Sep 26, Sep 27, 1998 1997 - ----------------------------------------------------------------------------------------------------- Net Income (loss) ($521) ($3,409) Average shares of common stock outstanding during the period 9,174 9,133 ------------- ------------- Basic Earnings per share ($0.06) ($0.37) ============= ============= Net Income (loss) (521) (3,409) Interest on Convertible Debt (Net of Taxes) 0 0 Amortization of OID (Net of Taxes) 0 0 Amortization of Deferred Debt Expense (Net of Taxes) 0 0 ------------- ------------- Adjusted Net Income (521) (3,409) ============= ============= Average shares of common stock outstanding during the period 9,174 9,133 Incremental shares from assumed exercise of stock options, stock warrants & employee stock purchase plan 0 0 Dilution from Convertible Debt 0 0 Total shares used to calculate diluted EPS 9,174 9,133 ------------- ------------- Diluted earnings per share ($0.06) ($0.37) ============= =============