Company profile
Ticker
OHM
Exchange
Employees
Incorporated
Location
Fiscal year end
Industry (SIC)
SEC CIK
Corporate docs
Latest filings (excl ownership)
424B3
Prospectus supplement
21 Sep 99
S-4
Registration of securities issued in business combination transactions
23 Apr 99
15-12B
Securities registration termination
25 Jun 98
15-12B
Securities registration termination
25 Jun 98
DEFA14A
Additional proxy soliciting materials
22 May 98
10-Q
1998 Q1
Quarterly report
15 May 98