X0303 4 2011-03-03 0 0000724004 MESA LABORATORIES INC /CO MLAB 0001246295 GUILLEMIN EVAN 380 LAFAYETTE STREET SIXTH FLOOR NEW YORK NY 10003 1 0 0 0 Mesa Laboratories, Inc. Common Stock 2011-03-03 2011-03-03 4 P 0 10000 29 A 200000 I SEG Ventures, LLC C/O Select Equities Group, Inc. 380 Lafayette St., 6th Floor New York, NY 10003 Evan Guillemin 2011-03-03