PSYCHEMEDICS CORP

CUSIP: 744375205 Class: COM NEW

OBERWEIS ASSET MANAGEMENT INC/'s Holding History (CIK: 0000937886)

Note: Option positions (PUT/CALL) are excluded.

Q2 2017
Shares 17,000 Value ($000) $424 Avg Close — Range —
Q1 2017
Shares 25,000 Value ($000) $501 Avg Close — Range —
Q4 2016
Shares 25,000 Value ($000) $617 Avg Close — Range —