X0303 4 2010-01-28 0 0000317771 TELLABS INC TLAB 0001012910 BIRCK MICHAEL J ONE TELLABS CENTER 1415 W. DIEHL ROAD NAPERVILLE IL 60563 1 1 0 0 Chairman of the Board Common Stock 2010-01-28 4 S 0 50000 6.4528 D 15161000 I By Partnership Common Stock 2010-01-29 4 S 0 250000 6.5794 D 14911000 I By Partnership Common Stock 16558171 D Common Stock 1081 I By Managed Account Common Stock 2248870 I By Spouse The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by Oak Street Investments, L. P. on August 31, 2009. This transaction was executed in multiple trades at prices ranging from $6.38 to $6.47. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. Held by Oak Street - Mr. Birck disclaims beneficial ownership of the shares held by Oak Street except to the extent of his pecuniary interest therein. This transaction was executed in multiple trades at prices ranging from $6.50 to $6.74. The price reported above reflects the weighted average sales price. The reporting person hereby undertakes to provide upon request to the SEC staff, the issuer or a security holder of the issuer full information regarding the number of shares and prices at which the transaction was effected. Held through the Tellabs 401(k) Plan. Held by spouse - Mr. Birck disclaims beneficial ownership of these shares. By: /s/ James M. Sheehan For: Michael J. Birck 2010-02-01