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


                                  SCHEDULE 13G


                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                                (AMENDMENT NO. )*



                      Pioneer Diversified High Income Trust
--------------------------------------------------------------------------------
                                (NAME OF ISSUER)

                                  Common Stock
--------------------------------------------------------------------------------
                         (TITLE OF CLASS OF SECURITIES)



                                    723653101
                                 ==============
                                 (CUSIP NUMBER)

                                December 31, 2009
--------------------------------------------------------------------------------
             (DATE OF EVENT WHICH REQUIRES FILING OF THIS STATEMENT)

Check the appropriate box to designate the rule pursuant to which this Schedule
is filed:

|X| Rule 13d-1(b)

| | Rule 13d-1(c)

| | Rule 13d-1(d)

*  The remainder of this cover page shall be filled out for a reporting person's
   initial filing on this form with respect to the subject class of securities,
   and for any subsequent amendment containing information which would alter the
   disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of (S) 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).

CUSIP No. 723653101
--------------------------------------------------------------------------------
1. Names of Reporting Persons.

     Claymore Securities Defined Portfolios, Series 491, 503, 507,
     524, 532, 534, 540, 547, 553, 569, 572, 580, 596, 613, 614 and
     635
--------------------------------------------------------------------------------

                                       1

--------------------------------------------------------------------------------
I.R.S. Identification Nos. of above persons (entities only):

     Claymore  Securities  Defined  Portfolios,  Series 491 -- Tax ID# 137593933
     Claymore  Securities  Defined  Portfolios,  Series 491 -- Tax ID# 137593980
     Claymore  Securities  Defined  Portfolios,  Series 503 -- Tax ID# 137605871
     Claymore  Securities  Defined  Portfolios,  Series 507 -- Tax ID# 137605900
     Claymore  Securities  Defined  Portfolios,  Series 524 -- Tax ID# 306165974
     Claymore  Securities  Defined  Portfolios,  Series 532 -- Tax ID# 386863731
     Claymore  Securities  Defined  Portfolios,  Series 534 -- Tax ID# 616358259
     Claymore  Securities  Defined  Portfolios,  Series 540 -- Tax ID# 386863707
     Claymore  Securities  Defined  Portfolios,  Series 547 -- Tax ID# 546806531
     Claymore  Securities  Defined  Portfolios,  Series 553 -- Tax ID# 546806610
     Claymore  Securities  Defined  Portfolios,  Series 553 -- Tax ID# 546806609
     Claymore  Securities  Defined  Portfolios,  Series 569 -- Tax ID# 616370058
     Claymore  Securities  Defined  Portfolios,  Series 572 -- Tax ID# 616370061
     Claymore  Securities  Defined  Portfolios,  Series 580 -- Tax ID# 306187565
     Claymore  Securities  Defined  Portfolios,  Series 596 -- Tax ID# 276089514
     Claymore  Securities  Defined  Portfolios,  Series 613 -- Tax ID# 276176919
     Claymore  Securities  Defined  Portfolios,  Series 614 -- Tax ID# 276183141
     Claymore  Securities  Defined  Portfolios,  Series 635 -- Tax ID# 276298021
     Claymore  Securities  Defined  Portfolios,  Series 635 -- Tax ID# 276297976


--------------------------------------------------------------------------------
2. Check the Appropriate Box if a Member of a Group (See Instructions)
     (a) __
     (b) __
--------------------------------------------------------------------------------
3. SEC Use Only
--------------------------------------------------------------------------------
4. Citizenship or Place of Organization:

     Claymore Securities Defined Portfolios, Series 491, Lisle, IL
     Claymore Securities Defined Portfolios, Series 503, Lisle, IL
     Claymore Securities Defined Portfolios, Series 507, Lisle, IL
     Claymore Securities Defined Portfolios, Series 524, Lisle, IL
     Claymore Securities Defined Portfolios, Series 532, Lisle, IL
     Claymore Securities Defined Portfolios, Series 534, Lisle, IL
     Claymore Securities Defined Portfolios, Series 540, Lisle, IL
     Claymore Securities Defined Portfolios, Series 547, Lisle, IL
     Claymore Securities Defined Portfolios, Series 553, Lisle, IL
     Claymore Securities Defined Portfolios, Series 569, Lisle, IL
     Claymore Securities Defined Portfolios, Series 572, Lisle, IL
     Claymore Securities Defined Portfolios, Series 580, Lisle, IL
     Claymore Securities Defined Portfolios, Series 596, Lisle, IL
     Claymore Securities Defined Portfolios, Series 613, Lisle, IL
     Claymore Securities Defined Portfolios, Series 614, Lisle, IL
     Claymore Securities Defined Portfolios, Series 635, Lisle, IL


--------------------------------------------------------------------------------

   Number of     5.    Sole Voting Power
    Shares
Beneficially by                507,326
   Owned by    -----------------------------------------------------------------
     Each        6.    Shared Voting Power
   Reporting
    Person     -----------------------------------------------------------------
     With:       7.    Sole Dispositive Power

                               507,326
               -----------------------------------------------------------------
                 8.    Shared Dispositive Power


                                       2

--------------------------------------------------------------------------------
9. Aggregate Amount Beneficially Owned by Each Reporting Person

                 507,326
--------------------------------------------------------------------------------
10. Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
Instructions)
--------------------------------------------------------------------------------
11. Percent of Class Represented by Amount in Row (9)

                 6.20%
--------------------------------------------------------------------------------
12. Type of Reporting Person (See Instructions)

                 IV
--------------------------------------------------------------------------------

ITEM 1.        (a) Name of Issuer

                    Pioneer Investment Management Inc.

               (b) Address of Issuer's Principal Executive Offices

                    60 State Street
                    Boston, MA 02109

ITEM 2.        (a) Name of Person Filing

                    Claymore Securities, Inc. as Sponsor for the Filing Entities

               (b) Address of Principal Business Office or, if none, Residence

                    2455 Corporate West Drive
                    Lisle, IL 60532

               (c) Citizenship

                    USA

               (d) Title of Class of Securities

                    Common Stock

               (e) CUSIP Number

                    723653101

ITEM 3.        IF THIS STATEMENT IS FILED PURSUANT TO (S) (S) 240.13D-1 (B) OR
               240.13D-2(B) OR (C), CHECK WHETHER THE PERSON FILING IS A:

                    (a) |X|Broker or dealer  registered  under section 15 of the
                    Act (15  U.S.C,  78o).

                    (b) | |Bank as  defined  in section  3(a)(6) of the Act (15
                    U.S.C. 78c).

                    (c) | |Insurance  company as defined in section 3(a)(19) of
                    the  Act  (15  U.S.C.   78c).

                    (d) | |Investment  company registered under section 8 of the
                    Investment  Company Act of 1940 (15 U.S.C 80a-8).

                    (e) | |An   investment    adviser   in   accordance   with
                    SECTION240.13d-l(b)(l}(ii)(E);

                    (f) | |An  employee  benefit  plan  or  endowment  fund  in
                    accordance  with  SECTION240.13d-l(b)(l}(ii)(F);

                    (g) | |A  parent  holding  company  or  control  person  in
                    accordance  with  SECTION240.13d-l(b)(l)(ii)(G);

                    (h) | | A savings associations as defined in Section 3(b) of
                    the Federal Deposit Insurance Act (12 U.S.C.  1813);

                    (i) | | A church plan that is excluded  from the  definition
                    of an  investment  company  under  section  3(c)(14)  of the
                    Investment  Company Act of 1940 (15 U.S.C.  80a-3);

                    (j) | |A church plan that is excluded from the definition of
                    an  investment   company  under  section   3(c)(14)  of  the
                    Investment Company Act of 1940 (15 U.S.C. 80a-3);

                    (j) | | Group, in accordance with
                    SECTION240.13d-l(b)(l)(ii)(J).

                                       3


ITEM 4. OWNERSHIP.

      Provide the following information regarding the aggregate number and
percentage of the class of securities of the issuer identified in Item 1.

                    (a) Amount beneficially owned: 507,326

                    (b) Percent of class: 6.20%

                    (c) Number of shares as to which the person  has:

                         (i) Sole  power to vote or to direct the vote  507,326

                         (ii) Shared  power to vote or to direct the vote _____.

                         (iii) Sole power to dispose or to direct the
                         disposition of 507,326

                         (iv) Shared power to dispose or to direct the
                         disposition of _______.

      Instruction. For computations regarding securities which represent a right
      to acquire an underlying security see Section N240.13d-3(d)(l).

ITEM 5. OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

      If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than
five percent of the class of securities, check the following | |.

Instruction: Dissolution of a group requires a response to this item.

ITEM 6. OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON.

      If any other person is known to have the right to receive or the power to
direct the receipt of dividends from, or the proceeds from the sale of, such
securities, a statement to that effect should be included in response to this
item and, if such interest relates to more than five percent of the class, such
person should be identified. A listing of the shareholders of an investment
company registered under the Investment Company Act of 1940 or the beneficiaries
of employee benefit plan, pension fund or endowment fund is not required.

ITEM 7. IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE
SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY

      If a parent holding company has filed this schedule, pursuant to Rule
13d-l(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the
identity and the Item 3 classification of the relevant subsidiary. If a parent
holding company has filed this schedule pursuant to Rule 13d-l(c) or Rule
13d-l(d), attach an exhibit stating the identification of the relevant
subsidiary.

ITEM 8. IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

      If a group has filed this schedule pursuant to
SECTION240.13d-l(b)(l)(ii)(J), so indicate under Item 3(j) and attach an exhibit
stating the identity and Item 3 classification of each member of the group. If a
group has filed this schedule pursuant to SECTION240.13d-l(c) or
SECTION240.13d-I(d), attach an exhibit stating the identity of each member of
the group.

ITEM 9. NOTICE OF DISSOLUTION OF GROUP

      Notice of dissolution of a group may be furnished as an exhibit stating
the date of the dissolution and that all further filings with respect to
transactions in the security reported on will be filed, if required, by members
of the group, in their individual capacity. See Item 5.

ITEM 10. CERTIFICATION

     (a) The following certification shall be included if the statement is
     filed pursuant to SECTION240.13d-1 (b):

               By signing  below I certify that, to the best of my knowledge and
               belief,  the  securities  referred to above were acquired and are
               held in the ordinary course of business and were not acquired and
               are not held for the purpose of or with the effect of changing or
               influencing  the control of the issuer of the securities and were
               not  acquired  and  are  not  held  in  connection  with  or as a
               participant in any transaction having that purpose or effect.

                                       4


     (b)The following certification shall be included if the statement is filed
     pursuant to SECTIONS240.13d-l(c):

               By signing  below I certify that, to the best of my knowledge and
               belief,  the  securities  referred to above were not acquired and
               are not held for the purpose of or with the effect of changing or
               influencing  the control of the issuer of the securities and were
               not  acquired  and  are  not  held  in  connection  with  or as a
               participant in any transaction having that purpose or effect.


                                    SIGNATURE

      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.



                                               January 25, 2010
                              ==================================================
                                                     Date


                                            /s/ Kevin M. Robinson
                              ==================================================
                                                  Signature

                                  Kevin M. Robinson, Senior Managing Director,
                                      General Counsel and Corporate Secretary
                                          Claymore Securities, Inc.
                              --------------------------------------------------
                                                  Name/Title

      The original statement shall be signed by each person on whose behalf the
statement is filed or his authorized representative. If the statement is signed
on behalf of a person by his authorized representative other than an executive
officer or general partner of the filing person, evidence of the
representative's authority to sign on behalf of such person shall be filed with
the statement, provided, however, that a power of attorney for this purpose
which is already on file with the Commission may be incorporated by reference.
The name and any title of each person who signs the statement shall be typed or
printed beneath his signature.

NOTE: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See SECTIONS240.13d-7 for other
parties for whom copies are to be sent.

ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT CONSTITUTE FEDERAL
CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001)

                                       5