| SC 13G | 2002-12-09 | ESSEX INVESTMENT MANAGEMENT CO LLC | OSI SYSTEMS INC | 9 | 11.0% | EDGAR |
| SC 13G | 2002-11-07 | ESSEX INVESTMENT MANAGEMENT CO INC | OSI SYSTEMS INC | 9 | 11.0% | EDGAR |
| SC 13G | 2002-10-23 | CAVALLO CAPITAL CORP | OSI SYSTEMS INC | 755,967 | 5.4% | EDGAR |
| SC 13G | 2002-10-15 | ESSEX INVESTMENT MANAGEMENT CO INC | OSI SYSTEMS INC | 9 | 11.0% | EDGAR |
| SC 13G | 2002-09-05 | ESSEX INVESTMENT MANAGEMENT CO INC | OSI SYSTEMS INC | 9 | 11.0% | EDGAR |
| SC 13G | 2002-08-16 | ESSEX INVESTMENT MANAGEMENT CO INC | OSI SYSTEMS INC | 9 | 11.0% | EDGAR |
| SC 13G | 2002-08-16 | ESSEX INVESTMENT MANAGEMENT CO INC | OSI SYSTEMS INC | 9 | 11.0% | EDGAR |
| SC 13G | 2002-08-16 | ESSEX INVESTMENT MANAGEMENT CO INC | OSI SYSTEMS INC | 9 | 11.0% | EDGAR |
| SC 13G | 2002-08-15 | ESSEX INVESTMENT MANAGEMENT CO INC | OSI SYSTEMS INC | 9 | 11.0% | EDGAR |
| SC 13G | 2002-07-18 | OSI SYSTEMS INC | IMAGIS TECHNOLOGIES INC | 1,166,667 | 6.4% | EDGAR |
| SC 13G | 2002-04-10 | ESSEX INVESTMENT MANAGEMENT CO INC | OSI SYSTEMS INC | 9 | 11.0% | EDGAR |
| SC 13G | 2002-03-08 | ESSEX INVESTMENT MANAGEMENT CO INC | OSI SYSTEMS INC | 9 | 11.0% | EDGAR |
| SC 13G | 2002-02-15 | CAVALLO CAPITAL CORP | OSI SYSTEMS INC | 505,115 | 4.1% | EDGAR |
| SC 13G/A | 2002-02-14 | BENSON ASSOCIATES LLC | OSI SYSTEMS INC | 29,600 | 0.2% | EDGAR |
| SC 13G/A | 2002-02-12 | DIMENSIONAL FUND ADVISORS INC | OSI SYSTEMS INC | 710,800 | 5.7% | EDGAR |
| SC 13G | 2002-02-11 | ESSEX INVESTMENT MANAGEMENT CO INC | OSI SYSTEMS INC | 9 | 11.0% | EDGAR |
| SC 13G | 2002-01-10 | ESSEX INVESTMENT MANAGEMENT CO INC | OSI SYSTEMS INC | 9 | 11.0% | EDGAR |
| SC 13G/A | 2002-01-07 | CHAMBERLAIN SALLY F AS TRUSTEE OF THE EDWARD P FLEISCHER TRU | OSI SYSTEMS INC | 0 | 0.0% | EDGAR |
| SC 13G/A | 2002-01-07 | CHAMBERLAIN SALLY F AS TRUSTEE OF THE EDWARD P FLEISCHER TRU | OSI SYSTEMS INC | 965,853 | 9.9% | EDGAR |
| SC 13G | 2001-12-20 | CAVALLO CAPITAL CORP | OSI SYSTEMS INC | 1,145,276 | 9.2% | EDGAR |