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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1092367	Sycamore Networks Inc	SCMR	Telephone & Telegraph Apparatus (3661)	043410558

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1119837	W John Gerdelman	C/O Sycamore Networks, Inc. 220 Mill Road Chelmsford MA 01824		Yes	No	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2009-12-16	7,450	$21.16	2,248	No	4	P	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	P	Direct

Footnotes

Shares were acquired pursuant to an automatic broker dividend reinvestment plan as a result of the Company's payment of a $1.00 per share of Common Stock cash distribution on December 15, 2009 and reflect number of shares acquired prior to the implementation of the reverse stock split referenced below.
This number reflects the total number of shares of Common Stock held by such person following the implementation of the previously announced 1-for-10 reverse stock split of the Company's Common Stock, which became effective at 5:00 p.m., Eastern Time, on December 21, 2009. Under the terms of the reverse stock split, every ten shares of the Company's issued and outstanding Common Stock immediately prior to the effective time were combined into one share of Common Stock. No fractional shares were issued as a result of the reverse stock split.