15
EXHIBIT A
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Agreement of Joint Filing
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The undersigned hereby agree that they are filing jointly
pursuant to Rule 13d-1 of the Act the statement dated February 15,
1999, containing the information required by Schedule 13G, for the
6,708,738
Shares of the Common Stock of Tellabs, Inc. held by or on
behalf of Xxxxxxx X. Xxxxx, the 584,000 shares of the Common Stock of
Tellabs, Inc. held by Xxxxxxxxx X. Xxxxx and the 12,500,000 shares
of the Common Stock of Tellabs, Inc. held by Oak Street Investments,
L.P.
Dated: February 15, 1999
XXXXXXX X. XXXXX
s/Xxxxxxx X. Xxxxx
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XXXXXXXXX X. XXXXX
s/Xxxxxxxxx X. Xxxxx
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OAK STREET INVESTMENTS, L.P.
By: s/Xxxxxxx X. Xxxxx, General Partner
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