UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

 
SCHEDULE 13D
 

 
Under the Securities Exchange Act of 1934
 
(Amendment No. 1)*
 

Markwest Energy Partners, L.P.
(Name of Issuer)


Common Units Representing Limited Partner Interests
 (Title of Class of Securities)

570759100
(CUSIP Number)


Diane Bono, Chief Compliance Officer
11550 Ash Street
Suite 300
Leawood, KS  66211
Telephone (913) 981-1020
 (Name, Address and Telephone Number of Person
Authorized to Receive Notices and Communications)


December 4, 2015
(Date of Event Which Requires Filing of this Statement)


 
If the filing person has previously filed a statement on Schedule 13G to report the acquisition that is the subject of this Schedule 13D, and is filing this schedule because of sections 240.13d-1(e), 240.13d-1(f) or 140.13d-1(g), check the following box.  []
 

 
_____________________
 
The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes).
 

Page 1 of 4
 
 
 
CUSIP No. 50187A107 (Common Units)

1.
 Names of Reporting Persons
 Tortoise Capital Advisors, L.L.C.
 
2.
 Check the Appropriate Box if a Member of a Group (See Instructions)
 (a)           ¨
 (b)           ý
3.
 SEC Use Only
 
 
4.
 Source of Funds (See Instructions)
 
 
 OO
5.
 Check if Disclosure of Legal Proceedings is Required Pursuant to Items 2(d) or 2(e)
 
 
 ¨
6.
 Citizenship or Place of Organization
 
 Delaware Limited Liability Company
Number of
Shares
Beneficially
Owned by
Each
Reporting
Person With
7.
 Sole Voting Power
 
 0
8.
 Shared Voting Power
 
 0
9.
 Sole Dispositive Power
 
 0
10.
 Shared Dispositive Power
 
 0
11.
 Aggregate Amount Beneficially Owned by Each Reporting Person
 
 0
12.
 Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions)¨
 
 
13.
 Percent of Class Represented by Amount in Row (11)
 
 0%
14.
 Type of Reporting Person (See Instructions)
 
 IA

Page 2 of 4
 
 
 
CUSIP No. 50187A107 (Common Units)


This Amendment No. 1 to Schedule 13D relates to common units representing limited partner interests (“Common Units”) of MarkWest Energy Partners, L.P. (“Issuer”) and amends the statement on Schedule 13D filed by Tortoise Capital Advisors, L.L.C. on November 17, 2015 (the “Initial Statement” and, together with this Amendment No. 1, the “Schedule 13D”).  Capitalized terms used but not defined in this Amendment No. 1 shall have the same meaning ascribed to them in the Initial Statement.  Except as expressly amended or supplemented in this Amendment No. 1, all other information in the Initial Statement is as set forth therein.  Only the Items amended are set forth herein.


Item 4.  Purpose of Transaction.
 
Item 4 of the Initial Statement is hereby amended by adding the following:
 
“Pursuant to the terms of the Amended Merger Agreement, on December 4, 2015, Merger Sub was merged with and into the Issuer, with the Issuer surviving the Merger as a wholly owned subsidiary of MPLX.
 
At the effective time of the Merger, each issued and outstanding Common Unit of the Issuer was converted into the right to receive 1.09 common units of MPLX and $6.20 per Common Unit in cash.
 
As a result of the transactions described above, TCA no longer beneficially owns any Common Units of the Issuer.”
 

 
Item 5.  Interest in Securities of the Issuer.
 
Item 5 of the Initial Statement is hereby amended and supplemented as follows:

“(a,b) TCA no longer beneficially owns any Common Units of Issuer.

(c)      Transactions
Please refer to Exhibit 5 for transactions since the date of the last transaction included in Exhibit 5 to the Initial Statement.
 
(d)      The investment companies and client managed accounts discussed in the Initial Statement had the right to receive all dividends from, and the proceeds from the sale of, the securities held in their respective accounts.  The interest of any one such person did not exceed 5% of the class of securities.
 
(e)      On December 4, 2015, TCA ceased to be the beneficial owner of more than five percent of the Common Units of Issuer.”


Item 7.  Material to be Filed as Exhibits. 

 
Exhibit 5.
Transactions in Issuer Common Units by the Reporting Person since the filing of the Initial Statement.
 

 

Page 3 of 4
 
 
 
CUSIP No. 50187A107 (Common Units)

SIGNATURES
 

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.
 
  TORTOISE CAPITAL ADVISORS, L.L.C.  
       
Dated: December 8, 2015
By:
/s/ Matthew G.P. Sallee  
    Name: Matthew G.P. Sallee   
    Title: Managing Director   
       
 
 
 
 
 
 
 
 
 

 

Page 4 of 4
 
 
 



EXHIBIT 5
 
 
The following table sets forth all transactions with respect to the Common Units Representing Limited Partnership Interests ("Common Units") effected by the Reporting Person since November 16, 2015 to the effective time of the Merger. All such transactions were purchases or sales of units effected in the open market.  The per unit prices noted in the table below include commissions/fees paid.
 
All transactions reported were effected on behalf of client accounts for which the Reporting Person is the investment adviser.
 

 
Nature of Transaction
Reporting Person
  
Date of Transaction
    
Amount of Securities
    
Price per Unit ($)
  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     11-16-2015       1,428       45.29  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     11-17-2015       476       43.41  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     11-19-2015       111       44.32  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     11-20-2015       3,663       42.76  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     11-23-2015       1,137       42.37  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     11-24-2015       1,995       44.03  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     11-25-2015       2,444       43.81  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     11-25-2015       1,184       44.13  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     11-27-2015       56       43.73  
Purchase of Common Units
Tortoise Capital Advisors, L.L.C.
     11-30-2015       348       47.36  
Purchase of Common Units
Tortoise Capital Advisors, L.L.C.
     11-30-2015       186       47.35  
Purchase of Common Units
Tortoise Capital Advisors, L.L.C.
     11-30-2015       63,958       47.39  
Purchase of Common Units
Tortoise Capital Advisors, L.L.C.
     11-30-2015       520       47.32  
Purchase of Common Units
Tortoise Capital Advisors, L.L.C.
     11-30-2015       1,001       46.99  
Purchase of Common Units
Tortoise Capital Advisors, L.L.C.
     11-30-2015       435       47.32  
Purchase of Common Units
Tortoise Capital Advisors, L.L.C.
     11-30-2015       5,698       47.39  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     11-30-2015       2,796       47.24  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     11-30-2015       935       47.69  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     11-30-2015       15,050       47.43  
Purchase of Common Units
Tortoise Capital Advisors, L.L.C.
     11-30-2015       36,612       47.41  
Purchase of Common Units
Tortoise Capital Advisors, L.L.C.
     11-30-2015       1,596       47.38  
Purchase of Common Units
Tortoise Capital Advisors, L.L.C.
     12-01-2015       69,743       46.74  
Purchase of Common Units
Tortoise Capital Advisors, L.L.C.
     12-01-2015       242       46.77  
Purchase of Common Units
Tortoise Capital Advisors, L.L.C.
     12-01-2015       883       47.81  
Purchase of Common Units
Tortoise Capital Advisors, L.L.C.
     12-01-2015       50       46.89  
Purchase of Common Units
Tortoise Capital Advisors, L.L.C.
     12-01-2015       161       46.78  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     12-01-2015       1,425       48.61  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     12-01-2015       2,395       47.99  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     12-01-2015       818       45.53  
Purchase of Common Units
Tortoise Capital Advisors, L.L.C.
     12-01-2015       6,914       46.76  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     12-01-2015       381       45.53  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     12-01-2015       2,786       45.95  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     12-02-2015       368       45.30  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     12-03-2015       240       42.49  
Sale of Common Units
Tortoise Capital Advisors, L.L.C.
     12-03-2015       767       42.24  
                           

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