Avici Systems, Inc.

DateInflation Amount Per Share*
7/28/2000**$56.0654***
7/31/2000$56.2698
8/1/2000$59.055
8/2/2000$59.055
8/3/2000$59.055
8/4/2000$59.055
8/7/2000$59.055
8/8/2000$59.055
8/9/2000$59.055
8/10/2000$59.055
8/11/2000$59.055
8/14/2000$59.055
8/15/2000$59.055
8/16/2000$59.055
8/17/2000$59.055
8/18/2000$59.055
8/21/2000$59.055
8/22/2000$59.055
8/23/2000$59.055
8/24/2000$59.055
8/25/2000$59.055
8/28/2000$59.055
8/29/2000$59.055
8/30/2000$59.055
8/31/2000$59.055
9/1/2000$59.055
9/5/2000$59.055
9/6/2000$59.055
9/7/2000$59.055
9/8/2000$59.055
9/11/2000$59.055
9/12/2000$57.4949
9/13/2000$57.1905
9/14/2000$56.4566
9/15/2000$53.1818
9/18/2000$46.9136
9/19/2000$58.1185
9/20/2000$59.055
9/21/2000$59.055
9/22/2000$59.055
9/25/2000$59.055
9/26/2000$59.0451
9/27/2000$58.4589
9/28/2000$58.3955
9/29/2000$55.2066
10/2/2000$41.1581
10/3/2000$46.0321
10/4/2000$41.5793
10/5/2000$43.2239
10/6/2000$40.2801
10/9/2000$39.6779
10/10/2000$32.9196
10/11/2000$43.5482
10/12/2000$42.2794
10/13/2000$44.0239
10/16/2000$49.1209
10/17/2000$44.631
10/18/2000$36.9107
10/19/2000$27.418
10/20/2000$28.8123
10/23/2000$29.7179
10/24/2000$25.3749
10/25/2000$16.1612
10/26/2000$7.8671
10/27/2000$8.9175
10/30/2000$3.9755
10/31/2000$5.6631
11/1/2000$2.6141
11/2/2000$7.5088
11/3/2000$11.8361
11/6/2000$6.8449
11/7/2000$9.3662
11/8/2000$7.6748
11/9/2000$8.8558
11/10/2000$7.2354
11/13/2000$6.0995
11/14/2000$7.4598
11/15/2000$4.5562
11/16/2000$0.6908
11/17/2000$0
11/20/2000$0
11/21/2000$0
11/22/2000$0
11/24/2000$0
11/27/2000$0
11/28/2000$0
11/29/2000$0
11/30/2000$0
12/1/2000$0
12/4/2000$0
12/5/2000$0
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 $31.00 per share have no artificial inflation.