X0306 4 2014-02-06 0 0000728331 SUTRON CORP STRN 0001472885 Perlus Microcap Fund L.P. 5TH FLOOR, 37 ESPLANADE ST. HELIER JERSEY X0 JE1 2TR UNITED KINGDOM 0 0 1 0 0001601068 PERLUS INVESTMENT MANAGEMENT LLP PLEDGDON LODGE BISHIOP'S STORTFORD X0 CM22 B6N UNITED KINGDOM 0 0 1 0 0001600873 PERLUS Ltd 5TH FLOOR 37 ESPLANADE ST HELIER ST HELIER CHANNEL ISLANDS Y9 JE1 2T4 JERSEY 0 0 1 0 Common Stock 548099 D Common Stock 2014-02-06 4 J 0 9500 5.20 A 9500 I (1) Common Stock 2014-02-08 4 J 0 250 5.20 A 9750 I (1) Common Stock 2014-02-18 4 J 0 1300 5.20 A 11050 I (1) Perlus Investment Management LLP holds these shares in a managed account on behalf of its client. Perlus Investment Management LLP generates performance fees on this managed account and is deemed to have indirect pecuniary interest in these shares. Perlus Microcap Fund L.P., Perlus Limited and Perlus Investment Management LLP disclaim any beneficial ownership of these shares. /s/ James Boucherat 2014-02-25