Exhibit 11.1 BOX HILL SYSTEMS CORP. AND SUBSIDIARY PRO FORMA NET INCOME PER SHARE CALCULATION (in thousands, except per share amounts) Three Months Ended Nine Months Ended September 30, September 30, ----------------- ----------------- 1997 1996 1997 1996 ------- ------- ------- ------- Pro forma net income .................. $ 1,740 $ 794 $ 4,814 $ 2,476 ======= ======= ======= ======= Weighted average shares outstanding ... 10,506 9,900 10,104 9,900 Dilutive effect of common stock equivalents ...................... 1,078 1,093 1,077 1,080 Weighted average number of shares that were required to be sold to fund distributions to the S Corporation shareholders ..................... 635 753 714 753 ------- ------- ------- ------- Shares used in computing pro forma income per share ................. 12,219 11,746 11,895 11,733 ======= ======= ======= ======= Pro forma net income per share ........ $ .14 $ .07 $ .40 $ .21 ======= ======= ======= ======= -15- ____________ Mark up the preceding blank FDS for use, for example, with an annual report on Form 10-K or 10-KSB that would be filed by a registrant whose fiscal year ended December 31, 1995; note that responses to the monetary tags would be expressed in thousands of dollars (000's omitted) unless the value for [MULTIPLIER] were changed to a different, acceptable number. The preceding FDS is for use with EDGAR Release 4.40 (the current system). See "Format and Input of Financial Data Schedules (Applicable to All Filers)" in Appendix E of the EDGAR Filer Manual (December 1995) and "Financial Data Schedules: Frequently Asked Questions" in the October 1995 issue of SEC EDGAR News. July 22, 1996 EDGAR Services Global Financial Press (212) 387-7200