Centra Software, Inc.

DateInflation Amount Per Share*
2/3/2000**$22.1271***
2/4/2000$20.5112
2/7/2000$18.8047
2/8/2000$20.208
2/9/2000$19.3562
2/10/2000$18.8686
2/11/2000$19.7467
2/14/2000$19.4905
2/15/2000$21.2829
2/16/2000$21.6006
2/17/2000$21.0602
2/18/2000$20.8899
2/22/2000$21.1346
2/23/2000$21.3996
2/24/2000$22.1271
2/25/2000$21.8327
2/28/2000$21.9002
2/29/2000$22.1271
3/1/2000$22.1271
3/2/2000$21.7156
3/3/2000$21.9412
3/6/2000$21.9877
3/7/2000$21.8893
3/8/2000$20.383
3/9/2000$20.012
3/10/2000$21.758
3/13/2000$20.8315
3/14/2000$21.2096
3/15/2000$22.1045
3/16/2000$21.5235
3/17/2000$21.0616
3/20/2000$20.809
3/21/2000$20.0195
3/22/2000$19.3586
3/23/2000$18.4305
3/24/2000$18.7971
3/27/2000$18.9263
3/28/2000$16.8076
3/29/2000$14.9787
3/30/2000$15.0465
3/31/2000$13.6601
4/3/2000$11.2862
4/4/2000$8.1631
4/5/2000$9.1438
4/6/2000$9.4121
4/7/2000$7.8922
4/10/2000$6.6684
4/11/2000$7.5541
4/12/2000$8.3677
4/13/2000$5.4868
4/14/2000$4.1236
4/17/2000$3.5863
4/18/2000$2.9599
4/19/2000$2.1562
4/20/2000$2.3112
4/24/2000$1.7751
4/25/2000$1.7127
4/26/2000$1.3804
4/27/2000$1.9897
4/28/2000$2.6155
5/1/2000$3.1457
5/2/2000$2.8271
5/3/2000$2.6607
5/4/2000$2.6708
5/5/2000$1.8327
5/8/2000$1.0573
5/9/2000$1.2432
5/10/2000$0.8921
5/11/2000$1.0145
5/12/2000$0.7744
5/15/2000$1.4641
5/16/2000$0.8396
5/17/2000$0.4505
5/18/2000$0.9267
5/19/2000$1.21
5/22/2000$1.1808
5/23/2000$0.6404
5/24/2000$1.5636
5/25/2000$0.2413
5/26/2000$0.4146
5/30/2000$0.5055
5/31/2000$0.2716
6/1/2000$0.1657
6/2/2000$1.1235
6/5/2000$2.668
6/6/2000$4.1081
6/7/2000$5.3853
6/8/2000$4.2219
6/9/2000$4.3698
6/12/2000$4.8488
6/13/2000$4.7279
6/14/2000$4.3197
6/15/2000$4.5315
6/16/2000$4.4665
6/19/2000$4.4301
6/20/2000$4.1553
6/21/2000$3.6412
6/22/2000$4.4322
6/23/2000$3.6939
6/26/2000$2.9816
6/27/2000$2.4023
6/28/2000$2.5429
6/29/2000$2.967
6/30/2000$2.7733
7/3/2000$2.787
7/5/2000$2.9501
7/6/2000$4.1168
7/7/2000$4.4808
7/10/2000$3.7459
7/11/2000$3.213
7/12/2000$2.5144
7/13/2000$5.5298
7/14/2000$8.4017
7/17/2000$7.7323
7/18/2000$8.0941
7/19/2000$6.9424
7/20/2000$7.5915
7/21/2000$6.25
7/24/2000$6.0845
7/25/2000$5.9782
7/26/2000$5.2581
7/27/2000$3.6367
7/28/2000$2.7189
7/31/2000$1.1886
8/1/2000$0.7376
8/2/2000$1.1045
8/3/2000$1.1888
8/4/2000$1.0421
8/7/2000$1.0958
8/8/2000$0.7059
8/9/2000$0.7568
8/10/2000$0.5761
8/11/2000$0.5432
8/14/2000$0.7815
8/15/2000$0.7001
8/16/2000$0.8093
8/17/2000$0.4294
8/18/2000$0.427
8/21/2000$0.5322
8/22/2000$0.282
8/23/2000$0.2396
8/24/2000$0.3656
8/25/2000$0.3456
8/28/2000$0.2146
8/29/2000$0.3577
8/30/2000$2.9636
8/31/2000$2.0163
9/1/2000$1.7429
9/5/2000$2.1998
9/6/2000$1.8985
9/7/2000$1.0609
9/8/2000$1.1955
9/11/2000$1.0935
9/12/2000$1.4328
9/13/2000$1.1968
9/14/2000$1.4119
9/15/2000$0.9644
9/18/2000$0.8467
9/19/2000$0.8246
9/20/2000$0.5595
9/21/2000$0.4335
9/22/2000$0.4954
9/25/2000$1.067
9/26/2000$1.4439
9/27/2000$0.5695
9/28/2000$0.1727
9/29/2000$0.3859
10/2/2000$0.3233
10/3/2000$0.0573
10/4/2000$0.1393
10/5/2000$0.0213
10/6/2000$0.0881
10/9/2000$0.1017
10/10/2000$0.0201
10/11/2000$0
10/12/2000$0.528
10/13/2000$0.042
10/16/2000$0
10/17/2000$0.0364
10/18/2000$0
10/19/2000$0.0333
10/20/2000$0.119
10/23/2000$0.9627
10/24/2000$0.3363
10/25/2000$0.1631
10/26/2000$0.4633
10/27/2000$0.2451
10/30/2000$0
10/31/2000$0.2388
11/1/2000$0.1803
11/2/2000$0.0219
11/3/2000$0.1131
11/6/2000$0.588
11/7/2000$2.1446
11/8/2000$2.0755
11/9/2000$2.4372
11/10/2000$2.3718
11/13/2000$2.3756
11/14/2000$2.5112
11/15/2000$1.8334
11/16/2000$1.4757
11/17/2000$1.4613
11/20/2000$1.9698
11/21/2000$2.0494
11/22/2000$1.7921
11/24/2000$1.3688
11/27/2000$1.6077
11/28/2000$1.526
11/29/2000$0.7579
11/30/2000$0.3259
12/1/2000$0.8204
12/4/2000$0.1817
12/5/2000$0.1732
12/6/2000$0

* Data shown are adjusted forward for all stock splits between the IPO and 12/6/00.

** Purchases on a date not listed in the chart above have no artificial inflation.

*** Purchases in the IPO itself at $14.00 per share have no artificial inflation.