DEXCOM INC

Ticker: DXCM CUSIP: 252131107 Class: EQTY

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

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

Q1 2017

Shares 20,580 Value ($000) $1,744 Avg Close $19.52 Range $14.42 - $22.20

Q4 2016

Shares 66,280 Value ($000) $3,957 Avg Close $17.71 Range $14.84 - $21.95

Q3 2016

Shares 115,890 Value ($000) $10,159 Avg Close $22.24 Range $19.05 - $24.09

Q2 2016

Shares 133,175 Value ($000) $10,565 Avg Close $17.03 Range $15.02 - $20.31

Q1 2016

Shares 150,245 Value ($000) $10,203 Avg Close $16.70 Range $11.98 - $20.97

Q4 2015

Shares 95,785 Value ($000) $7,845 Avg Close $20.81 Range $17.57 - $22.36

Q3 2015

Shares 13,100 Value ($000) $1,125 Avg Close $22.31 Range $19.11 - $25.82

Q2 2015

Shares 18,300 Value ($000) $1,464 Avg Close $17.56 Range $15.20 - $20.14

Q1 2015

Shares 17,000 Value ($000) $1,060 Avg Close $15.11 Range $13.32 - $16.16

Q4 2014

Shares 4,200 Value ($000) $231 Avg Close $12.24 Range $9.69 - $14.58

Q3 2014

Shares 5,500 Value ($000) $220 Avg Close $10.22 Range $8.67 - $11.59

Q2 2014

Shares 5,200 Value ($000) $206 Avg Close $8.86 Range $7.02 - $10.62

Period	Shares	Value ($000)	Average Close	Price Range
Q1 2017	20,580	$1,744	$19.52	$14.42 - $22.20
Q4 2016	66,280	$3,957	$17.71	$14.84 - $21.95
Q3 2016	115,890	$10,159	$22.24	$19.05 - $24.09
Q2 2016	133,175	$10,565	$17.03	$15.02 - $20.31
Q1 2016	150,245	$10,203	$16.70	$11.98 - $20.97
Q4 2015	95,785	$7,845	$20.81	$17.57 - $22.36
Q3 2015	13,100	$1,125	$22.31	$19.11 - $25.82
Q2 2015	18,300	$1,464	$17.56	$15.20 - $20.14
Q1 2015	17,000	$1,060	$15.11	$13.32 - $16.16
Q4 2014	4,200	$231	$12.24	$9.69 - $14.58
Q3 2014	5,500	$220	$10.22	$8.67 - $11.59
Q2 2014	5,200	$206	$8.86	$7.02 - $10.62