BIO LOGIC SYSTEMS CORP

Beneficial ownership report for a passive holder of more than 5% (Schedule 13G)

Certification of termination of registration of a class of securities (Section 12(g))

Beneficial ownership report for a holder of more than 5% (Schedule 13D) (amendment)

1.01,5.02,9.01

Additional Information for Proxy Statement/ Votes

Beneficial ownership report for a holder of more than 5% (Schedule 13D) (amendment)

Additional Information for Proxy Statement/ Votes

No description available

No description available

Beneficial ownership report for a holder of more than 5% (Schedule 13D)

1.01,9.01

General form for quarterly reports under Section 13 or 15(d)

Entry into a Material Definitive Agreement

General form for quarterly reports under Section 13 or 15(d)

2.02,9.01

Definitive Proxy Statement

Preliminary Proxy Statement

Annual report pursuant to Section 13 or 15(d)

2.02,9.01

Entry into a Material Definitive Agreement

General form for quarterly reports under Section 13 or 15(d)

2.02,8.01

General form for quarterly reports under Section 13 or 15(d)

2.02

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

General form for quarterly reports under Section 13 or 15(d)

12

Required Information in Proxy Statement

Definitive Proxy Statement

Annual report pursuant to Section 13 or 15(d)

12

General form for quarterly reports under Section 13 or 15(d)

General form for quarterly reports under Section 13 or 15(d)

12

General form for quarterly reports under Section 13 or 15(d)

Definitive Proxy Statement

7,9

Annual report pursuant to Section 13 or 15(d)

7,9

No description available

No description available

No description available

Definitive Proxy Statement

No description available

No description available

No description available

No description available

No description available

No description available

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Definitive Proxy Statement

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Definitive Proxy Statement

Definitive Proxy Statement

4,7

4,7

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Definitive Proxy Statement

RAVIV GABRIEL; Raviv Dorit

JOHNSON RODERICK G

HANLEY MICHAEL J

DAMRON LAWRENCE D

MOORE CRAIG W

MILSTEIN ALBERT

JOHNSON RODERICK G

NATUS MEDICAL INC

MILSTEIN ALBERT

Raviv Dorit;RAVIV GABRIEL

Raviv Dorit;RAVIV GABRIEL

MOORE CRAIG W

JOHNSON RODERICK G

DAMRON LAWRENCE D

MOORE CRAIG W

MOORE CRAIG W