Exhibit 11 NAI TECHNOLOGIES, INC. AND SUBSIDIARIES (In thousands) - --------------------------------------------------------------------------------------------------- Three Months Ended June 28, June 29, 1997 1996 - --------------------------------------------------------------------------------------------------- Net Income (loss) $501 $815 Average shares of common stock outstanding during the period 9,075 8,031 Incremental shares from assumed exercise of stock options, stock warrants & employee stock purchase plan (primary) 1,316 482 Total shares used to calculate PEPS * 10,391 8,513 ------- ------- Primary earnings per share $0.05 $0.10 ======= ======= Net Income (loss) 501 815 Interest on Convertible Debt (Net of Taxes) 157 217 Amortization of OID (Net of Taxes) 32 35 Amortization of Deferred Debt Expense (Net of Taxes) 77 170 ------- ------- Adjusted Net Income 767 1,237 ======= ======= Average shares of common stock outstanding during the period 9,075 8,031 Incremental shares from assumed exercise of stock options, stock warrants & employee stock purchase plan (fully diluted) 1,316 870 Dilution from Convertible Debt 2,591 3,171 Total shares used to calculate FDEPS * 12,982 12,072 ------- ------- Fully Diluted earnings per share $0.06 $0.10 ======= ======= * Per APB 15, when a net loss is reported, exercise or conversion is not to be assumed. ================================================================================ Exhibit 11 NAI TECHNOLOGIES, INC. AND SUBSIDIARIES (In thousands) - --------------------------------------------------------------------------------------------------- Six months ended June 28, June 29, 1997 1996 - --------------------------------------------------------------------------------------------------- Net Income (loss) $880 $365 Average shares of common stock outstanding during the period 9,052 7,747 Incremental shares from assumed exercise of stock options, stock warrants & employee stock purchase plan (primary) 1,243 241 Total shares used to calculate PEPS * 10,295 7,988 ------- ------- Primary earnings per share $0.09 $0.05 ======= ======= Net Income (loss) 880 365 Interest on Convertible Debt (Net of Taxes) 308 363 Amortization of OID (Net of Taxes) 76 61 Amortization of Deferred Debt Expense (Net of Taxes) 180 225 ------- ------- Adjusted Net Income 1,444 1,014 ======= ======= Average shares of common stock outstanding during the period 9,052 7,747 Incremental shares from assumed exercise of stock options, stock warrants & employee stock purchase plan (primary) 1,336 436 Dilution from Convertible Debt 2,592 3,171 Total shares used to calculate FDEPS * 12,980 11,354 ------- ------- Fully Diluted earnings per share $0.11 $0.09 ======= ======= * Per APB 15, when a net loss is reported, exercise or conversion is not to be assumed. ================================================================================ -2-