You have but to ask...

Here are the current underwriters for WETA from http://tinyurl.com/39hljb

I formatted them so that a vertical bar (|) delineates the various fields. The first field is the corporate name, second is the phone number, third is the web site, etc. Using the vertical bar should make it easier to format this stuff in your favorite spreadsheet, word processor, etc. If there is no e-mail contact, it's because I couldn't find one. Anything with a URL is an e-mail website. I hope the URLs work.

Airbus|703 834-3400|www.airbusnorthamerica.com|90.9 FM Supporter
Americom Government Services|1-609-987-4000|www.ses-americom.com/|90.9 Supporter, TV 26 Supporter| americom@ses-americom.com
Arena Stage|202.488.4377|www.arenastage.org|90.9 FM Supporter|info@arenastage.org
Booz Allen Hamilton|703.902.4933|www.bah.com|TV 26 Supporter|Diane Merolla at communications@bah.com
Cabot Creamery||www.cabotcheese.com|90.9 FM Supporter|info@cabotcheese.com or http://tinyurl.com/32jzfn
Case Design/Remodeling, Inc.|(800) 426-9434|www.casedesign.com|90.9 FM Supporter|http://tinyurl.com/375xan
CDW•G|800.581.4239|www.cdwg.com|90.9 Supporter, TV 26 Supporter|CustomerRelations@web.cdw.com
Chevy Chase Bank||www.chevychasebank.com|90.9 FM Supporter|http://tinyurl.com/2bxvfl
Don Beyer Volvo and Land Rover Alexandria|703.237.5000|www.donbeyervolvo.com|90.9 FM Supporter|sbeyer@donbeyervolvo.com
Dow, Lohnes & Albertson|202.776.2000|www.dlalaw.com|90.9 FM Supporter|http://tinyurl.com/26vbeg
Folger Shakespeare Library||www.folger.edu|90.9 FM Supporter|membership@folger.edu
Freddie Mac||www.freddiemac.com|90.9 FM Supporter|corprel@freddiemac.com
Georgetown University Center for Professional Development|202.687.7000 |www.cpd.georgetown.edu|90.9 Supporter, TV 26 Supporter|
Giant Food of Maryland, Inc.|301.341.4100|www.giantfood.com|90.9 FM Supporter|http://tinyurl.com/22e8nv
Golin/Harris|703.741.7500|www.golinharris.com|90.9 FM Supporter|information@golinharris.com
Harness, Dickey & Pierce, P.L.C.|703.668.8000|www.hdp.com|90.9 FM Supporter|hdpinfo@hdp.com
John F. Kennedy Center for the Performing Arts|202.467.4600|www.kennedy-center.org|90.9 FM Supporter
Kaiser Permanente of the Mid-Atlantic States||www.kaiserpermanente.org|90.9 FM Supporter
Katten Muchin Rosenman, LLP|202.625.3500|www.kattenlaw.com|90.9 FM Supporter|http://tinyurl.com/2yoffn
Koshland Museum||www.koshlandsciencemuseum.org|90.9 FM Supporter|ksm@nas.edu
M&T Bank|800.724.2440|www.mandtbank.com|TV 26 Supporter|http://tinyurl.com/2amtkt
Microsoft Corporation||www.microsoft.com|90.9 Supporter, TV 26 Supporter|Didn't even try.
Mindbank|1-800-MINDBANK|www.mindbank.com|90.9 FM Supporter|administration@mindbank.com
Mitretek Systems||www.mitretek.org|90.9 FM Supporter|corpcomm@mitretek.org
Morgan Franklin||www.morgan-franklin.com|90.9 FM Supporter|http://tinyurl.com/2f2ldr
Nixon Peabody LLP|202.585.8000|www.nixonpeabody.com|90.9 FM Supporter|Andrea Goodman, Director of Communications, at 617-345-1381, agoodman@nixonpeabody.com (maybe?)
Peapod by Giant|800.573.2763|www.giantfood.com/peapod|TV 26 Supporter|See Giant Food of Maryland
Phillips Collection|(202) 387-2151|www.phillipscollection.org|90.9 Supporter, TV 26 Supporter|directorsoffice@phillipscollection.org
Syms Corporation|201.902.9100|www.syms.com|TV 26 Supporter|customerservice@syms.com
Washington Ballet|202.467.4600|www.washingtonballet.org|90.9 FM Supporter|Caroline Baldwin, Manager of Foundation Relations, 202.362.3606 x123, cbaldwin@washingtonballet.org
Washington National Opera|202.432.seat|www.ticketmaster.com|90.9 FM Supporter|info@dc-opera.org
Washington Performing Arts Society||www.wpas.org|90.9 FM Supporter|info@wpas.org
Weschler's Auction House|202.628.1281|www.weschlers.com|TV 26 Supporter|info@weschlers.com
Williams Mullen||www.williamsmullen.com|90.9 FM Supporter|ask@williamsmullen.com
Wolf Trap Foundation for the Performing Arts||www.wolf-trap.org|90.9 FM Supporter|wolftrap@wolftrap.org

Here is a list of all the email addresses I could find separated from the above list in a format suitable for sticking in the To: line of an email. There are 22 out of a grand total of 35.
administration@mindbank.com
agoodman@nixonpeabody.com
ask@williamsmullen.com
cbaldwin@washingtonballet.org
corpcomm@mitretek.org
corprel@freddiemac.com
CustomerRelations@web.cdw.com
customerservice@syms.com
communications@bah.com
directorsoffice@phillipscollection.org
hdpinfo@hdp.com
americom@ses-americom.com
info@arenastage.org
info@cabotcheese.com
info@dc-opera.org
info@weschlers.com
info@wpas.org
information@golinharris.com
ksm@nas.edu
membership@folger.edu
sbeyer@donbeyervolvo.com
wolftrap@wolftrap.org