Sycamore Networks, Inc.

DateInflation Amount Per Share*
10/22/1999**$32.0714***
10/25/1999$24.5453
10/26/1999$41.2225
10/27/1999$38.8047
10/28/1999$41.1102
10/29/1999$42.5834
11/1/1999$45.1333
11/2/1999$45.1422
11/3/1999$47.2163
11/4/1999$45.5404
11/5/1999$58.4532
11/8/1999$55.7207
11/9/1999$51.1098
11/10/1999$48.827
11/11/1999$45.3104
11/12/1999$53.6242
11/15/1999$53.0678
11/16/1999$58.8569
11/17/1999$58.1189
11/18/1999$64.5752
11/19/1999$55.4202
11/22/1999$45.9062
11/23/1999$41.4077
11/24/1999$41.9399
11/26/1999$42.3837
11/29/1999$37.5518
11/30/1999$36.4523
12/1/1999$33.2296
12/2/1999$37.9712
12/3/1999$43.1056
12/6/1999$38.5694
12/7/1999$41.4237
12/8/1999$45.0092
12/9/1999$39.3628
12/10/1999$30.6904
12/13/1999$37.1502
12/14/1999$39.2779
12/15/1999$41.3734
12/16/1999$37.112
12/17/1999$34.8214
12/20/1999$45.8193
12/21/1999$53.2773
12/22/1999$58.1988
12/23/1999$59.8949
12/27/1999$56.7301
12/28/1999$67.5031
12/29/1999$64.1619
12/30/1999$57.114
12/31/1999$60.7771
1/3/2000$60.3217
1/4/2000$58.8653
1/5/2000$54.3982
1/6/2000$43.5762
1/7/2000$56.7373
1/10/2000$54.3884
1/11/2000$38.6959
1/12/2000$43.7781
1/13/2000$38.8863
1/14/2000$41.5381
1/18/2000$35.8952
1/19/2000$27.5786
1/20/2000$22.9415
1/21/2000$45.2609
1/24/2000$46.6486
1/25/2000$53.7034
1/26/2000$59.8928
1/27/2000$67.4055
1/28/2000$69.4833
1/31/2000$71.6913
2/1/2000$61.6293
2/2/2000$59.7974
2/3/2000$59.2767
2/4/2000$50.3164
2/7/2000$46.7914
2/8/2000$43.4597
2/9/2000$52.8268
2/10/2000$56.3289
2/11/2000$55.1947
2/14/2000$66.2572
2/15/2000$66.5475
2/16/2000$74.1435
2/17/2000$79.155
2/18/2000$75.6949
2/22/2000$73.4157
2/23/2000$68.7038
2/24/2000$65.9071
2/25/2000$79.2641
2/28/2000$86.9237
2/29/2000$87.1307
3/1/2000$87.1307
3/2/2000$87.1307
3/3/2000$87.1307
3/6/2000$87.1307
3/7/2000$87.1307
3/8/2000$87.1307
3/9/2000$87.1307
3/10/2000$87.1307
3/13/2000$87.1307
3/14/2000$87.0265
3/15/2000$85.9227
3/16/2000$85.5749
3/17/2000$87.0519
3/20/2000$82.3499
3/21/2000$75.7761
3/22/2000$86.0427
3/23/2000$79.615
3/24/2000$87.1307
3/27/2000$87.1196
3/28/2000$84.1036
3/29/2000$74.1405
3/30/2000$82.2387
3/31/2000$80.0035
4/3/2000$49.7243
4/4/2000$46.213
4/5/2000$52.617
4/6/2000$67.6078
4/7/2000$63.9761
4/10/2000$47.1798
4/11/2000$33.3539
4/12/2000$6.4407
4/13/2000$0
4/14/2000$0
4/17/2000$0
4/18/2000$9.2613
4/19/2000$6.2264
4/20/2000$2.4047
4/24/2000$1.8464
4/25/2000$4.2509
4/26/2000$0.0744
4/27/2000$1.9496
4/28/2000$10.4444
5/1/2000$26.3455
5/2/2000$23.0875
5/3/2000$13.4365
5/4/2000$20.4964
5/5/2000$33.2083
5/8/2000$38.0015
5/9/2000$11.781
5/10/2000$3.3607
5/11/2000$3.0609
5/12/2000$6.4891
5/15/2000$10.5304
5/16/2000$27.7745
5/17/2000$38.0254
5/18/2000$50.5163
5/19/2000$36.0174
5/22/2000$34.8896
5/23/2000$25.9024
5/24/2000$25.4422
5/25/2000$28.2393
5/26/2000$31.4893
5/30/2000$47.4257
5/31/2000$38.8102
6/1/2000$44.3312
6/2/2000$68.719
6/5/2000$57.9345
6/6/2000$58.6971
6/7/2000$52.4959
6/8/2000$56.0159
6/9/2000$49.2436
6/12/2000$58.9155
6/13/2000$56.5027
6/14/2000$55.7025
6/15/2000$55.3015
6/16/2000$53.8627
6/19/2000$71.9118
6/20/2000$67.7038
6/21/2000$74.5177
6/22/2000$72.6907
6/23/2000$75.2733
6/26/2000$78.3573
6/27/2000$79.9781
6/28/2000$68.7117
6/29/2000$55.4826
6/30/2000$67.4445
7/3/2000$72.3906
7/5/2000$74.5924
7/6/2000$68.8318
7/7/2000$86.0778
7/10/2000$87.1307
7/11/2000$87.0627
7/12/2000$81.4064
7/13/2000$84.7937
7/14/2000$87.1307
7/17/2000$87.1307
7/18/2000$87.1307
7/19/2000$87.1307
7/20/2000$87.1307
7/21/2000$87.1307
7/24/2000$87.1307
7/25/2000$87.1307
7/26/2000$87.1307
7/27/2000$87.1307
7/28/2000$80.3437
7/31/2000$86.6564
8/1/2000$82.6556
8/2/2000$72.9929
8/3/2000$87.052
8/4/2000$87.1307
8/7/2000$87.1307
8/8/2000$87.1307
8/9/2000$87.1307
8/10/2000$87.1307
8/11/2000$87.1307
8/14/2000$87.1307
8/15/2000$87.1307
8/16/2000$87.1307
8/17/2000$87.1307
8/18/2000$87.1307
8/21/2000$87.1307
8/22/2000$87.1307
8/23/2000$87.1307
8/24/2000$87.1307
8/25/2000$87.1307
8/28/2000$87.1307
8/29/2000$87.1307
8/30/2000$87.1307
8/31/2000$87.1307
9/1/2000$87.1307
9/5/2000$87.1307
9/6/2000$87.1307
9/7/2000$79.1631
9/8/2000$74.0833
9/11/2000$82.6059
9/12/2000$74.4259
9/13/2000$72.7139
9/14/2000$68.7986
9/15/2000$63.6291
9/18/2000$58.5571
9/19/2000$63.3816
9/20/2000$61.0075
9/21/2000$74.021
9/22/2000$81.5527
9/25/2000$78.2089
9/26/2000$76.5686
9/27/2000$71.8912
9/28/2000$63.8502
9/29/2000$74.248
10/2/2000$74.9262
10/3/2000$67.6215
10/4/2000$70.2214
10/5/2000$51.1362
10/6/2000$33.6855
10/9/2000$48.9432
10/10/2000$38.6715
10/11/2000$30.187
10/12/2000$41.8238
10/13/2000$47.575
10/16/2000$48.105
10/17/2000$41.0201
10/18/2000$24.8116
10/19/2000$32.3318
10/20/2000$42.4786
10/23/2000$49.527
10/24/2000$40.72
10/25/2000$10.3796
10/26/2000$4.8577
10/27/2000$5.518
10/30/2000$0
10/31/2000$1.322
11/1/2000$0.4538
11/2/2000$0.1503
11/3/2000$5.0873
11/6/2000$8.3051
11/7/2000$2.6874
11/8/2000$0.0775
11/9/2000$1.3389
11/10/2000$1.4511
11/13/2000$5.8417
11/14/2000$7.4467
11/15/2000$17.348
11/16/2000$5.0773
11/17/2000$10.7801
11/20/2000$1.5855
11/21/2000$4.3447
11/22/2000$0
11/24/2000$2.0723
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$3.6673
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 $38.00 per share have no artificial inflation.