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Form EFFECT - Notice of Effectiveness:
SEC Accession No. 9999999995-12-003145
Accepted
2012-11-05 00:15:17
Documents
1
Effectiveness Date
2012-11-02
Registration Form
S-3

Document Format Files

Seq Description Document Type Size
1 primary_doc.html EFFECT  
1 primary_doc.xml EFFECT 5774
  Complete submission text file 9999999995-12-003145.txt   25099
Mailing Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9200
MARKWEST HYDROCARBON INC (Filer) CIK: 0001019756 (see all company filings)

IRS No.: 841352233 | State of Incorp.: DE | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-02 | Film No.: 121178411
SIC: 1311 Crude Petroleum & Natural Gas

Mailing Address 1515 ARAPAHOE STREET TOWER 1, SUITE 1600 DENVER CO 80202
Business Address 1515 ARAPAHOE STREET TOWER 1, SUITE 1600 DENVER CO 80202 303-925-9200
MARKWEST ENERGY PARTNERS L P (Filer) CIK: 0001166036 (see all company filings)

IRS No.: 270005456 | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482 | Film No.: 121178409
SIC: 1311 Crude Petroleum & Natural Gas

Mailing Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9200
MarkWest Energy Operating CO LLC (Filer) CIK: 0001292406 (see all company filings)

IRS No.: 270005448 | State of Incorp.: DE | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-27 | Film No.: 121178441

Mailing Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9200
West Shore Processing CO LLC (Filer) CIK: 0001292408 (see all company filings)

IRS No.: 760501616 | State of Incorp.: MI | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-26 | Film No.: 121178440

Mailing Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9200
MarkWest Energy Appalachia LLC (Filer) CIK: 0001292409 (see all company filings)

IRS No.: 470852385 | State of Incorp.: DE | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-25 | Film No.: 121178439

Mailing Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 70 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 70 DENVER CO 80202-2126 303-925-9200
MarkWest Michigan Pipeline CO LLC (Filer) CIK: 0001292411 (see all company filings)

IRS No.: 830375568 | State of Incorp.: MI | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-23 | Film No.: 121178437

Mailing Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9200
MarkWest Oklahoma Gas CO LLC (Filer) CIK: 0001292413 (see all company filings)

IRS No.: 861089780 | State of Incorp.: OK | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-22 | Film No.: 121178435

Mailing Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9200
MarkWest Power Tex LLC (Filer) CIK: 0001292414 (see all company filings)

IRS No.: 450537840 | State of Incorp.: TX | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-16 | Film No.: 121178431

Mailing Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9200
MarkWest Pinnacle LLC (Filer) CIK: 0001292415 (see all company filings)

IRS No.: 300157461 | State of Incorp.: TX | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-20 | Film No.: 121178433

Mailing Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202
Business Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202 303-925-9200
MarkWest PNG Utility LLC (Filer) CIK: 0001292416 (see all company filings)

IRS No.: 300157467 | State of Incorp.: TX | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-19 | Film No.: 121178432

Mailing Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9200
MarkWest Texas PNG Utility LLC (Filer) CIK: 0001292417 (see all company filings)

IRS No.: 300157468 | State of Incorp.: TX | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-18 | Film No.: 121178416

Mailing Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9200
MarkWest Blackhawk LLC (Filer) CIK: 0001292418 (see all company filings)

IRS No.: 300157471 | State of Incorp.: TX | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-17 | Film No.: 121178415

Mailing Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9200
MarkWest New Mexico LLC (Filer) CIK: 0001292419 (see all company filings)

IRS No.: 300157474 | State of Incorp.: TX | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-21 | Film No.: 121178434

Mailing Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9200
MarkWest Pipeline CO LLC (Filer) CIK: 0001315242 (see all company filings)

IRS No.: 000000000 | State of Incorp.: TX | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-15 | Film No.: 121178430

Mailing Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9200
MarkWest Energy East Texas Gas CO LLC (Filer) CIK: 0001315262 (see all company filings)

IRS No.: 201311706 | State of Incorp.: DE | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-14 | Film No.: 121178429

Mailing Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9200
MarkWest Energy Finance CORP (Filer) CIK: 0001315263 (see all company filings)

IRS No.: 201805917 | State of Incorp.: DE | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-28 | Film No.: 121178442
SIC: 1311 Crude Petroleum & Natural Gas

Mailing Address 1515 ARAPAHOE STREET TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9278
Markwest Javelina Pipeline CO LLC (Filer) CIK: 0001349174 (see all company filings)

IRS No.: 382909338 | State of Incorp.: TX | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-12 | Film No.: 121178427

Mailing Address 1515 ARAPAHOE STREET TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9200
MarkWest Javelina CO LLC (Filer) CIK: 0001349175 (see all company filings)

IRS No.: 760263770 | State of Incorp.: TX | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-13 | Film No.: 121178428

Mailing Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202
Business Address 1515 ARAPAHOE STREET, TOWER 2, SUITE 700 DENVER CO 80202 303-925-9200
MarkWest Energy GP, L.L.C. (Filer) CIK: 0001412304 (see all company filings)

IRS No.: 010636219
Type: EFFECT | Act: 33 | File No.: 333-184482-03 | Film No.: 121178422

Mailing Address 1515 ARAPAHOE STREET TOWER II, SUITE 700 HOUSTON TX 80202
Business Address 1515 ARAPAHOE STREET TOWER II, SUITE 700 HOUSTON TX 80202 3039259200
Mason Pipeline LTD Liability CO (Filer) CIK: 0001435921 (see all company filings)

IRS No.: 000000000 | State of Incorp.: MI | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-24 | Film No.: 121178438

Mailing Address 1515 ARAPAHOE STREET TOWER II, SUITE 700 HOUSTON TX 80202
Business Address 1515 ARAPAHOE STREET TOWER II, SUITE 700 HOUSTON TX 80202 3039259200
MarkWest Marketing, L.L.C. (Filer) CIK: 0001435922 (see all company filings)

IRS No.: 262430225 | State of Incorp.: DE | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-01 | Film No.: 121178412

Mailing Address 1515 ARAPAHOE STREET TOWER II, SUITE 700 HOUSTON TX 80202
Business Address 1515 ARAPAHOE STREET TOWER II, SUITE 700 HOUSTON TX 80202 3039259200
MarkWest Gas Services, L.L.C. (Filer) CIK: 0001435923 (see all company filings)

IRS No.: 261795927 | State of Incorp.: TX | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-04 | Film No.: 121178418

Mailing Address 1515 ARAPAHOE STREET TOWER II, SUITE 700 HOUSTON TX 80202
Business Address 1515 ARAPAHOE STREET TOWER II, SUITE 700 HOUSTON TX 80202 3039259200
MarkWest Liberty Gas Gathering, L.L.C. (Filer) CIK: 0001435924 (see all company filings)

IRS No.: 262368254 | State of Incorp.: DE | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-10 | Film No.: 121178425

Mailing Address 1515 ARAPAHOE STREET TOWER II, SUITE 700 DENVER CO 80202
Business Address 1515 ARAPAHOE STREET TOWER II, SUITE 700 DENVER CO 80202 3039259200
Matrex, L.L.C. (Filer) CIK: 0001435926 (see all company filings)

IRS No.: 841349848 | State of Incorp.: MI | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-11 | Film No.: 121178426

Mailing Address 1515 ARAPAHOE STREET TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9200
MarkWest Gas Marketing, L.L.C. (Filer) CIK: 0001457473 (see all company filings)

IRS No.: 262827902 | State of Incorp.: TX | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-09 | Film No.: 121178424

Mailing Address 1515 ARAPAHOE STREET TOWER 2, SUITE 700 DENVER CO 80202-2126
Business Address 1515 ARAPAHOE STREET TOWER 2, SUITE 700 DENVER CO 80202-2126 303-925-9200
MarkWest McAlester, L.L.C. (Filer) CIK: 0001457474 (see all company filings)

IRS No.: 263195589 | State of Incorp.: OK | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-08 | Film No.: 121178423

Mailing Address 1515 ARAPAHOE STREET TOWER 1, SUITE 1600 DENVER CO 80202-2137
Business Address 1515 ARAPAHOE STREET TOWER 1, SUITE 1600 DENVER CO 80202-2137 (303) 925-9200
MarkWest Ranger Pipeline Company, L.L.C. (Filer) CIK: 0001512400 (see all company filings)

IRS No.: 274613260 | State of Incorp.: DE | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-07 | Film No.: 121178421

Mailing Address 1515 ARAPAHOE STREET TOWER I, STE. 1600 DENVER CO 80202-2137
Business Address 1515 ARAPAHOE STREET TOWER I, STE. 1600 DENVER CO 80202-2137 (303) 925-9200
MarkWest Mountaineer Pipeline Company, L.L.C. (Filer) CIK: 0001533090 (see all company filings)

IRS No.: 453160452 | State of Incorp.: DE | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-06 | Film No.: 121178420

Mailing Address 1515 ARAPAHOE STREET, TOWER 1 SUITE 1600 DENVER CO 80202
Business Address 1515 ARAPAHOE STREET, TOWER 1 SUITE 1600 DENVER CO 80202 (303) 925-9200
MarkWest Utica Operating Company, L.L.C. (Filer) CIK: 0001555528 (see all company filings)

IRS No.: 800773356 | State of Incorp.: DE | Fiscal Year End: 1231
Type: EFFECT | Act: 33 | File No.: 333-184482-05 | Film No.: 121178419