```

                                                             OMB APPROVAL
                                                     OMB Number:       3235-0578
                                                     Expires:  April 30, 2013
                                                     Estimated average burden
                                                     hours per response.....
                                                     5.6

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

                                   FORM N-Q

                   QUARTERLY SCHEDULE OF PORTFOLIO HOLDINGS
    OF REGISTERED MANAGEMENT INVESTMENT COMPANY

  Investment Company Act file number 811-01466

                            Pioneer Fund
               (Exact name of registrant as specified in charter)

                       60 State Street, Boston, MA 02109
              (Address of principal executive offices) (ZIP code)

            Terrence J. Cullen, Pioneer Investment Management, Inc.,
                       60 State Street, Boston, MA 02109
                    (Name and address of agent for service)

Registrant's telephone number, including area code:  (617) 742-7825

Date of fiscal year end:  December 31

Date of reporting period:  March 31, 2013

Form N-Q is to be used by management investment companies, other than small
business investment companies registered on Form N-5 (239.24 and 274.5 of this
chapter), to file reports with the Commission, not later than 60 days after
close of the first and third fiscal quarters, pursuant to Rule 30b1-5 under
the Investment Company Act of 1940 (17 CFR 270.30b1-5).  The Commission may
use the information provided on Form N-Q in its regulatory, disclosure review,
inspection, and policymaking roles.

A registrant is required to disclose the information specified by Form N-Q,
and the Commission will make this information public. A registrant is not
required to respond to the collection of information contained in Form N-Q
unless the Form displays a currently valid Office of Management and Budget
("OMB") control number. Please direct comments concerning the accuracy of the
information collection burden estimate and any suggestions for reducing the
burden to Secretary, Securities and Exchange Commission, 450 Fifth Street, NW,
Washington, DC 20549-0609.  The OMB has reviewed this collection of information
under the clearance requirements of 44 U.S.C. ss. 3507.

<PAGE>
ITEM 1. Schedule of Investments.
```

```

```

|                                                                                                                                                                                                    |      |   |   | Pioneer Fund                                                                                                                                                |   |          |   |   |   |
|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----------|--------|--------|-------------------------------------------------------------------------------------------------------------------------------------------------------------|--------|---------------|--------|--------|--------|
|                                                                                                                                                                                                    |      |   |   | Schedule of Investments 3/28/2013                                                                                                                           |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
|                                                                                                                                                                                                    | Shares    |   |   |                                                                                                                                                        |   | Value         |   |   |   |
|                                                                                                                                                                                                    |      |   |   | COMMON STOCKS - 100.0%                                                                                                                                      |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Energy - 11.1%                                                                                                                                              |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Oil & Gas Drilling - 0.9%                                                                                                                               |   |          |   |   |   |
|                                                                                                                                                                                                    | 622,048   |   |   | Ensco Plc                                                                                                                                                   | $      | 37,322,880    |   |   |   |
|                                                                                                                                                                                                    | 150,182   |   |   | Helmerich & Payne, Inc.                                                                                                                                 |   | 9,116,047     |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 46,438,927    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Oil & Gas Equipment & Services - 1.9%                                                                                                               |   |          |   |   |   |
|                                                                                                                                                                                                    | 139,400   |   |   | Cameron International Corp. *                                                                                                                               | $      | 9,088,880     |   |   |   |
|                                                                                                                                                                                                    | 177,000   |   |   | FMC Technologies, Inc. *                                                                                                                                    |   | 9,627,030     |   |   |   |
|                                                                                                                                                                                                    | 391,400   |   |   | Halliburton Co.                                                                                                                                             |   | 15,816,474    |   |   |   |
|                                                                                                                                                                                                    | 334,100   |   |   | National Oilwell Varco, Inc.                                                                                                                                |   | 23,637,575    |   |   |   |
|                                                                                                                                                                                                    | 496,196   |   |   | Schlumberger, Ltd.                                                                                                                                          |   | 37,160,118    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 95,330,077    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Integrated Oil & Gas - 2.9%                                                                                                                             |   |          |   |   |   |
|                                                                                                                                                                                                    | 690,810   |   |   | Chevron Corp.                                                                                                                                               | $      | 82,082,044    |   |   |   |
|                                                                                                                                                                                                    | 608,600   |   |   | Exxon Mobil Corp.                                                                                                                                           |   | 54,840,946    |   |   |   |
|                                                                                                                                                                                                    | 107,500   |   |   | Occidental Petroleum Corp.                                                                                                                                  |   | 8,424,775     |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 145,347,765   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Oil & Gas Exploration & Production - 3.9%                                                                                                           |   |          |   |   |   |
|                                                                                                                                                                                                    | 503,964   |   |   | Apache Corp.                                                                                                                                                | $      | 38,885,862    |   |   |   |
|                                                                                                                                                                                                    | 793,500   |   |   | Cabot Oil & Gas Corp.                                                                                                                                   |   | 53,648,535    |   |   |   |
|                                                                                                                                                                                                    | 531,069   |   |   | ConocoPhillips                                                                                                                                              |   | 31,917,247    |   |   |   |
|                                                                                                                                                                                                    | 1,134,009 |   |   | Marathon Oil Corp.                                                                                                                                          |   | 38,238,783    |   |   |   |
|                                                                                                                                                                                                    | 882,841   |   |   | Southwestern Energy Co. *                                                                                                                                   |   | 32,894,656    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 195,585,083   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Oil & Gas Refining & Marketing - 1.5%                                                                                                               |   |          |   |   |   |
|                                                                                                                                                                                                    | 471,804   |   |   | Marathon Petroleum Corp.                                                                                                                                    | $      | 42,273,638    |   |   |   |
|                                                                                                                                                                                                    | 460,384   |   |   | Phillips 66                                                                                                                                                 |   | 32,213,068    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 74,486,706    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Energy                                                                                                                                                | $      | 557,188,558   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Materials - 2.5%                                                                                                                                            |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Fertilizers & Agricultural Chemicals - 0.5%                                                                                                             |   |          |   |   |   |
|                                                                                                                                                                                                    | 404,500   |   |   | The Mosaic Co.                                                                                                                                              | $      | 24,112,245    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Industrial Gases - 0.9%                                                                                                                                     |   |          |   |   |   |
|                                                                                                                                                                                                    | 420,615   |   |   | Airgas, Inc.                                                                                                                                                | $      | 41,708,183    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Specialty Chemicals - 0.9%                                                                                                                                  |   |          |   |   |   |
|                                                                                                                                                                                                    | 576,011   |   |   | Ecolab, Inc.                                                                                                                                                | $      | 46,184,562    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Paper Products - 0.2%                                                                                                                                       |   |          |   |   |   |
|                                                                                                                                                                                                    | 236,600   |   |   | International Paper Co.                                                                                                                                     | $      | 11,020,828    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Materials                                                                                                                                             | $      | 123,025,818   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Capital Goods - 9.0%                                                                                                                                        |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Aerospace & Defense - 1.8%                                                                                                                              |   |          |   |   |   |
|                                                                                                                                                                                                    | 174,000   |   |   | Raytheon Co.                                                                                                                                                | $      | 10,229,460    |   |   |   |
|                                                                                                                                                                                                    | 857,476   |   |   | United Technologies Corp.                                                                                                                                   |   | 80,113,983    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 90,343,443    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Construction & Engineering - 0.6%                                                                                                                       |   |          |   |   |   |
|                                                                                                                                                                                                    | 863,800   |   |   | KBR, Inc.                                                                                                                                                   | $      | 27,710,704    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Electrical Components & Equipment - 0.3%                                                                                                                |   |          |   |   |   |
|                                                                                                                                                                                                    | 172,955   |   |   | Rockwell Automation, Inc.                                                                                                                                   | $      | 14,934,664    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Industrial Conglomerates - 2.7%                                                                                                                             |   |          |   |   |   |
|                                                                                                                                                                                                    | 699,562   |   |   | 3M Co.                                                                                                                                                      | $      | 74,370,436    |   |   |   |
|                                                                                                                                                                                                    | 2,642,305 |   |   | General Electric Co.                                                                                                                                        |   | 61,090,092    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 135,460,528   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Construction & Farm Machinery & Heavy Trucks - 2.0%                                                                                                 |   |          |   |   |   |
|                                                                                                                                                                                                    | 340,400   |   |   | Cummins, Inc.                                                                                                                                               | $      | 39,421,724    |   |   |   |
|                                                                                                                                                                                                    | 328,000   |   |   | Joy Global, Inc.                                                                                                                                            |   | 19,522,560    |   |   |   |
|                                                                                                                                                                                                    | 814,490   |   |   | PACCAR, Inc.                                                                                                                                                |   | 41,180,614    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 100,124,898   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Industrial Machinery - 1.6%                                                                                                                                 |   |          |   |   |   |
|                                                                                                                                                                                                    | 895,100   |   |   | Ingersoll-Rand Plc                                                                                                                                          | $      | 49,239,451    |   |   |   |
|                                                                                                                                                                                                    | 402,800   |   |   | SPX Corp.                                                                                                                                                   |   | 31,805,088    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 81,044,539    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Capital Goods                                                                                                                                         | $      | 449,618,776   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Transportation - 2.2%                                                                                                                                       |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Air Freight & Logistics - 0.5%                                                                                                                          |   |          |   |   |   |
|                                                                                                                                                                                                    | 273,100   |   |   | United Parcel Service, Inc. (Class B)                                                                                                                       | $      | 23,459,290    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Railroads - 1.7%                                                                                                                                            |   |          |   |   |   |
|                                                                                                                                                                                                    | 598,409   |   |   | Norfolk Southern Corp.                                                                                                                                      | $      | 46,125,366    |   |   |   |
|                                                                                                                                                                                                    | 298,200   |   |   | Union Pacific Corp.                                                                                                                                         |   | 42,466,662    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 88,592,028    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Transportation                                                                                                                                        | $      | 112,051,318   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Automobiles & Components - 2.1%                                                                                                                         |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Auto Parts & Equipment - 1.0%                                                                                                                           |   |          |   |   |   |
|                                                                                                                                                                                                    | 265,063   |   |   | BorgWarner, Inc. *                                                                                                                                          | $      | 20,499,972    |   |   |   |
|                                                                                                                                                                                                    | 860,683   |   |   | Johnson Controls, Inc.                                                                                                                                      |   | 30,184,153    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 50,684,125    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Automobile Manufacturers - 1.1%                                                                                                                             |   |          |   |   |   |
|                                                                                                                                                                                                    | 3,974,340 |   |   | Ford Motor Co.                                                                                                                                              | $      | 52,262,571    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Automobiles & Components                                                                                                                          | $      | 102,946,696   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Consumer Durables & Apparel - 0.5%                                                                                                                      |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Apparel, Accessories & Luxury Goods - 0.5%                                                                                                              |   |          |   |   |   |
|                                                                                                                                                                                                    | 530,226   |   |   | Coach, Inc.                                                                                                                                                 | $      | 26,505,998    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Consumer Durables & Apparel                                                                                                                       | $      | 26,505,998    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Consumer Services - 1.6%                                                                                                                                    |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Hotels, Resorts & Cruise Lines - 0.2%                                                                                                                   |   |          |   |   |   |
|                                                                                                                                                                                                    | 217,300   |   |   | Marriott International, Inc.                                                                                                                                | $      | 9,176,579     |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Restaurants - 1.4%                                                                                                                                          |   |          |   |   |   |
|                                                                                                                                                                                                    | 437,100   |   |   | McDonald's Corp.                                                                                                                                            | $      | 43,574,499    |   |   |   |
|                                                                                                                                                                                                    | 509,300   |   |   | Starbucks Corp.                                                                                                                                             |   | 29,009,728    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 72,584,227    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Consumer Services                                                                                                                                     | $      | 81,760,806    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Media - 4.1%                                                                                                                                                |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Cable & Satellite - 0.3%                                                                                                                                |   |          |   |   |   |
|                                                                                                                                                                                                    | 370,800   |   |   | Comcast Corp.                                                                                                                                               | $      | 15,577,308    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Movies & Entertainment - 1.6%                                                                                                                           |   |          |   |   |   |
|                                                                                                                                                                                                    | 1,136,700 |   |   | The Walt Disney Co.                                                                                                                                         | $      | 64,564,560    |   |   |   |
|                                                                                                                                                                                                    | 287,500   |   |   | Time Warner, Inc.                                                                                                                                           |   | 16,565,750    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 81,130,310    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Publishing - 2.2%                                                                                                                                           |   |          |   |   |   |
|                                                                                                                                                                                                    | 2,838,431 |   |   | John Wiley & Sons, Inc. (Class A) +                                                                                                                     | $      | 110,585,272   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Media                                                                                                                                                 | $      | 207,292,890   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Retailing - 4.5%                                                                                                                                            |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Department Stores - 1.2%                                                                                                                                    |   |          |   |   |   |
|                                                                                                                                                                                                    | 794,500   |   |   | Macy's, Inc.                                                                                                                                                | $      | 33,241,880    |   |   |   |
|                                                                                                                                                                                                    | 475,247   |   |   | Nordstrom, Inc.                                                                                                                                             |   | 26,247,892    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 59,489,772    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | General Merchandise Stores - 1.1%                                                                                                                           |   |          |   |   |   |
|                                                                                                                                                                                                    | 839,441   |   |   | Target Corp.                                                                                                                                                | $      | 57,459,736    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Apparel Retail - 1.5%                                                                                                                                       |   |          |   |   |   |
|                                                                                                                                                                                                    | 566,300   |   |   | Ross Stores, Inc.                                                                                                                                           | $      | 34,329,106    |   |   |   |
|                                                                                                                                                                                                    | 896,900   |   |   | TJX Companies, Inc.                                                                                                                                         |   | 41,930,075    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 76,259,181    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Home Improvement Retail - 0.7%                                                                                                                              |   |          |   |   |   |
|                                                                                                                                                                                                    | 394,104   |   |   | Lowe's Companies, Inc.                                                                                                                                      | $      | 14,944,424    |   |   |   |
|                                                                                                                                                                                                    | 267,600   |   |   | The Home Depot, Inc.                                                                                                                                        |   | 18,673,128    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 33,617,552    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Retailing                                                                                                                                             | $      | 226,826,241   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Food & Staples Retailing - 2.7%                                                                                                                         |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Drug Retail - 2.3%                                                                                                                                          |   |          |   |   |   |
|                                                                                                                                                                                                    | 744,800   |   |   | CVS Caremark Corp.                                                                                                                                          | $      | 40,956,552    |   |   |   |
|                                                                                                                                                                                                    | 1,598,871 |   |   | Walgreen Co.                                                                                                                                                |   | 76,234,169    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 117,190,721   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Hypermarkets & Super Centers - 0.4%                                                                                                                     |   |          |   |   |   |
|                                                                                                                                                                                                    | 235,700   |   |   | Wal-Mart Stores, Inc.                                                                                                                                       | $      | 17,637,431    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Food & Staples Retailing                                                                                                                          | $      | 134,828,152   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Food, Beverage & Tobacco - 7.6%                                                                                                                         |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Soft Drinks - 1.0%                                                                                                                                          |   |          |   |   |   |
|                                                                                                                                                                                                    | 357,000   |   |   | Coca-Cola Enterprises, Inc.                                                                                                                                 | $      | 13,180,440    |   |   |   |
|                                                                                                                                                                                                    | 407,500   |   |   | Dr. Pepper Snapple Group, Inc.                                                                                                                              |   | 19,132,125    |   |   |   |
|                                                                                                                                                                                                    | 233,100   |   |   | PepsiCo, Inc.                                                                                                                                               |   | 18,440,541    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 50,753,106    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Packaged Foods & Meats - 6.6%                                                                                                                           |   |          |   |   |   |
|                                                                                                                                                                                                    | 534,912   |   |   | Campbell Soup Co.                                                                                                                                           | $      | 24,263,608    |   |   |   |
|                                                                                                                                                                                                    | 766,758   |   |   | General Mills, Inc.                                                                                                                                         |   | 37,808,837    |   |   |   |
|                                                                                                                                                                                                    | 1,178,446 |   |   | HJ Heinz Co.                                                                                                                                                |   | 85,166,292    |   |   |   |
|                                                                                                                                                                                                    | 410,596   |   |   | Kraft Foods Group, Inc.                                                                                                                                     |   | 21,158,012    |   |   |   |
|                                                                                                                                                                                                    | 1,231,888 |   |   | Mondelez International, Inc.                                                                                                                                |   | 37,708,092    |   |   |   |
|                                                                                                                                                                                                    | 1,421,599 |   |   | The Hershey Co.                                                                                                                                             |   | 124,432,564   |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 330,537,405   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Food, Beverage & Tobacco                                                                                                                          | $      | 381,290,511   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Household & Personal Products - 3.0%                                                                                                                    |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Household Products - 3.0%                                                                                                                                   |   |          |   |   |   |
|                                                                                                                                                                                                    | 889,837   |   |   | Colgate-Palmolive Co.                                                                                                                                       | $      | 105,027,461   |   |   |   |
|                                                                                                                                                                                                    | 237,251   |   |   | The Clorox Co.                                                                                                                                              |   | 21,003,831    |   |   |   |
|                                                                                                                                                                                                    | 311,900   |   |   | The Procter & Gamble Co.                                                                                                                                |   | 24,035,014    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 150,066,306   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Household & Personal Products                                                                                                                     | $      | 150,066,306   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Health Care Equipment & Services - 6.7%                                                                                                                 |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Health Care Equipment - 5.3%                                                                                                                                |   |          |   |   |   |
|                                                                                                                                                                                                    | 1,179,749 |   |   | Abbott Laboratories                                                                                                                                         | $      | 41,668,735    |   |   |   |
|                                                                                                                                                                                                    | 450,281   |   |   | Baxter International, Inc.                                                                                                                                  |   | 32,708,412    |   |   |   |
|                                                                                                                                                                                                    | 499,915   |   |   | Becton Dickinson and Co.                                                                                                                                    |   | 47,796,873    |   |   |   |
|                                                                                                                                                                                                    | 695,480   |   |   | Covidien Plc                                                                                                                                                |   | 47,181,363    |   |   |   |
|                                                                                                                                                                                                    | 704,441   |   |   | CR Bard, Inc.                                                                                                                                               |   | 70,993,564    |   |   |   |
|                                                                                                                                                                                                    | 1,914,689 |   |   | Smith & Nephew Plc                                                                                                                                      |   | 22,101,752    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 262,450,699   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Health Care Distributors - 0.3%                                                                                                                             |   |          |   |   |   |
|                                                                                                                                                                                                    | 392,644   |   |   | Cardinal Health, Inc.                                                                                                                                       | $      | 16,341,843    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Health Care Services - 0.6%                                                                                                                                 |   |          |   |   |   |
|                                                                                                                                                                                                    | 174,800   |   |   | DaVita HealthCare Partners, Inc. *                                                                                                                          | $      | 20,729,532    |   |   |   |
|                                                                                                                                                                                                    | 189,490   |   |   | Express Scripts Holding Co. *                                                                                                                               |   | 10,924,098    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 31,653,630    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Managed Health Care - 0.5%                                                                                                                                  |   |          |   |   |   |
|                                                                                                                                                                                                    | 476,200   |   |   | Aetna, Inc.                                                                                                                                                 | $      | 24,343,344    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Health Care Equipment & Services                                                                                                                  | $      | 334,789,516   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Pharmaceuticals, Biotechnology & Life Sciences - 8.8%                                                                                                   |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Biotechnology - 3.0%                                                                                                                                        |   |          |   |   |   |
|                                                                                                                                                                                                    | 490,070   |   |   | Amgen, Inc.                                                                                                                                                 | $      | 50,237,076    |   |   |   |
|                                                                                                                                                                                                    | 335,600   |   |   | Celgene Corp. *                                                                                                                                             |   | 38,899,396    |   |   |   |
|                                                                                                                                                                                                    | 445,000   |   |   | Gilead Sciences, Inc. *                                                                                                                                     |   | 21,773,850    |   |   |   |
|                                                                                                                                                                                                    | 683,500   |   |   | Vertex Pharmaceuticals, Inc. *                                                                                                                              |   | 37,578,830    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 148,489,152   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Pharmaceuticals - 5.2%                                                                                                                                      |   |          |   |   |   |
|                                                                                                                                                                                                    | 1,179,749 |   |   | AbbVie, Inc.                                                                                                                                                | $      | 48,110,164    |   |   |   |
|                                                                                                                                                                                                    | 382,724   |   |   | Eli Lilly & Co.                                                                                                                                         |   | 21,734,896    |   |   |   |
|                                                                                                                                                                                                    | 1,055,000 |   |   | Johnson & Johnson                                                                                                                                       |   | 86,014,150    |   |   |   |
|                                                                                                                                                                                                    | 576,827   |   |   | Merck & Co., Inc.                                                                                                                                       |   | 25,513,058    |   |   |   |
|                                                                                                                                                                                                    | 2,791,153 |   |   | Pfizer, Inc.                                                                                                                                                |   | 80,552,676    |   |   |   |
|                                                                                                                                                                                                    | 48,100    |   |   | Zoetis, Inc.                                                                                                                                                |   | 1,606,540     |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 263,531,484   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Life Sciences Tools & Services - 0.6%                                                                                                                   |   |          |   |   |   |
|                                                                                                                                                                                                    | 200,800   |   |   | Agilent Technologies, Inc.                                                                                                                                  | $      | 8,427,576     |   |   |   |
|                                                                                                                                                                                                    | 286,400   |   |   | Thermo Fisher Scientific, Inc.                                                                                                                              |   | 21,906,736    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 30,334,312    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Pharmaceuticals, Biotechnology & Life Sciences                                                                                                    | $      | 442,354,948   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Banks - 5.2%                                                                                                                                                |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Diversified Banks - 3.6%                                                                                                                                    |   |          |   |   |   |
|                                                                                                                                                                                                    | 256,200   |   |   | Canadian Imperial Bank of Commerce                                                                                                                          | $      | 20,081,664    |   |   |   |
|                                                                                                                                                                                                    | 1,721,852 |   |   | US Bancorp                                                                                                                                                  |   | 58,422,438    |   |   |   |
|                                                                                                                                                                                                    | 2,695,369 |   |   | Wells Fargo & Co.                                                                                                                                       |   | 99,701,699    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 178,205,801   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Regional Banks - 1.6%                                                                                                                                       |   |          |   |   |   |
|                                                                                                                                                                                                    | 1,230,080 |   |   | PNC Financial Services Group, Inc.                                                                                                                          | $      | 81,800,320    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Banks                                                                                                                                                 | $      | 260,006,121   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Diversified Financials - 6.6%                                                                                                                               |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Other Diversified Financial Services - 2.7%                                                                                                                 |   |          |   |   |   |
|                                                                                                                                                                                                    | 2,380,500 |   |   | Bank of America Corp.                                                                                                                                       | $      | 28,994,490    |   |   |   |
|                                                                                                                                                                                                    | 1,444,200 |   |   | Citigroup, Inc.                                                                                                                                             |   | 63,891,408    |   |   |   |
|                                                                                                                                                                                                    | 897,800   |   |   | JPMorgan Chase & Co.                                                                                                                                    |   | 42,609,588    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 135,495,486   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Consumer Finance - 1.3%                                                                                                                                     |   |          |   |   |   |
|                                                                                                                                                                                                    | 431,657   |   |   | American Express Co.                                                                                                                                        | $      | 29,119,581    |   |   |   |
|                                                                                                                                                                                                    | 774,900   |   |   | Discover Financial Services                                                                                                                                 |   | 34,746,516    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 63,866,097    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Asset Management & Custody Banks - 2.2%                                                                                                                 |   |          |   |   |   |
|                                                                                                                                                                                                    | 259,876   |   |   | Franklin Resources, Inc.                                                                                                                                    | $      | 39,191,900    |   |   |   |
|                                                                                                                                                                                                    | 748,309   |   |   | Invesco, Ltd.                                                                                                                                               |   | 21,671,029    |   |   |   |
|                                                                                                                                                                                                    | 676,475   |   |   | T. Rowe Price Group, Inc.                                                                                                                                   |   | 50,647,683    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 111,510,612   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Investment Banking & Brokerage - 0.4%                                                                                                                   |   |          |   |   |   |
|                                                                                                                                                                                                    | 122,900   |   |   | The Goldman Sachs Group, Inc.                                                                                                                               | $      | 18,084,735    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Diversified Financials                                                                                                                                | $      | 328,956,930   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Insurance - 3.2%                                                                                                                                            |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Life & Health Insurance - 0.7%                                                                                                                          |   |          |   |   |   |
|                                                                                                                                                                                                    | 661,200   |   |   | Aflac, Inc.                                                                                                                                                 | $      | 34,395,624    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Property & Casualty Insurance - 2.5%                                                                                                                    |   |          |   |   |   |
|                                                                                                                                                                                                    | 999,120   |   |   | The Chubb Corp.                                                                                                                                             | $      | 87,452,974    |   |   |   |
|                                                                                                                                                                                                    | 469,297   |   |   | The Travelers Companies, Inc.                                                                                                                               |   | 39,510,114    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 126,963,088   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Insurance                                                                                                                                             | $      | 161,358,712   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Software & Services - 10.3%                                                                                                                             |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Internet Software & Services - 1.8%                                                                                                                     |   |          |   |   |   |
|                                                                                                                                                                                                    | 604,700   |   |   | eBay, Inc. *                                                                                                                                                | $      | 32,786,834    |   |   |   |
|                                                                                                                                                                                                    | 736,560   |   |   | Facebook, Inc. *                                                                                                                                            |   | 18,841,205    |   |   |   |
|                                                                                                                                                                                                    | 51,600    |   |   | Google, Inc. *                                                                                                                                              |   | 40,971,948    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 92,599,987    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | IT Consulting & Other Services - 1.2%                                                                                                                   |   |          |   |   |   |
|                                                                                                                                                                                                    | 287,077   |   |   | International Business Machines Corp.                                                                                                                       | $      | 61,233,524    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Data Processing & Outsourced Services - 3.0%                                                                                                            |   |          |   |   |   |
|                                                                                                                                                                                                    | 824,179   |   |   | Automatic Data Processing, Inc.                                                                                                                             | $      | 53,588,119    |   |   |   |
|                                                                                                                                                                                                    | 354,074   |   |   | DST Systems, Inc.                                                                                                                                           |   | 25,234,854    |   |   |   |
|                                                                                                                                                                                                    | 325,546   |   |   | Fiserv, Inc. *                                                                                                                                              |   | 28,592,705    |   |   |   |
|                                                                                                                                                                                                    | 36,800    |   |   | Mastercard, Inc.                                                                                                                                            |   | 19,913,584    |   |   |   |
|                                                                                                                                                                                                    | 130,000   |   |   | Visa, Inc.                                                                                                                                                  |   | 22,079,200    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 149,408,462   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Application Software - 1.0%                                                                                                                                 |   |          |   |   |   |
|                                                                                                                                                                                                    | 811,615   |   |   | Adobe Systems, Inc. *                                                                                                                                       | $      | 35,313,369    |   |   |   |
|                                                                                                                                                                                                    | 615,699   |   |   | Nuance Communications, Inc. *                                                                                                                               |   | 12,424,806    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 47,738,175    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Systems Software - 3.3%                                                                                                                                     |   |          |   |   |   |
|                                                                                                                                                                                                    | 3,024,794 |   |   | Microsoft Corp.                                                                                                                                             | $      | 86,539,356    |   |   |   |
|                                                                                                                                                                                                    | 1,377,648 |   |   | Oracle Corp.                                                                                                                                                |   | 44,553,136    |   |   |   |
|                                                                                                                                                                                                    | 1,329,300 |   |   | Symantec Corp.                                                                                                                                              |   | 32,807,124    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 163,899,616   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Software & Services                                                                                                                               | $      | 514,879,764   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Technology Hardware & Equipment - 3.7%                                                                                                                  |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Communications Equipment - 1.3%                                                                                                                             |   |          |   |   |   |
|                                                                                                                                                                                                    | 1,605,774 |   |   | Cisco Systems, Inc.                                                                                                                                         | $      | 33,576,734    |   |   |   |
|                                                                                                                                                                                                    | 131,200   |   |   | F5 Networks, Inc. *                                                                                                                                         |   | 11,687,296    |   |   |   |
|                                                                                                                                                                                                    | 297,421   |   |   | Motorola Solutions, Inc.                                                                                                                                    |   | 19,043,867    |   |   |   |
|                                                                                                                                                                                                    | 1,932     |   |   | Palo Alto Networks, Inc. *                                                                                                                                  |   | 109,351       |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 64,417,248    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Computer Hardware - 1.9%                                                                                                                                    |   |          |   |   |   |
|                                                                                                                                                                                                    | 214,011   |   |   | Apple, Inc.                                                                                                                                                 | $      | 94,727,689    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Computer Storage & Peripherals - 0.5%                                                                                                                   |   |          |   |   |   |
|                                                                                                                                                                                                    | 763,000   |   |   | EMC Corp. *                                                                                                                                                 | $      | 18,228,070    |   |   |   |
|                                                                                                                                                                                                    | 169,100   |   |   | SanDisk Corp. *                                                                                                                                             |   | 9,300,500     |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 27,528,570    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Technology Hardware & Equipment                                                                                                                   | $      | 186,673,507   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Semiconductors & Semiconductor Equipment - 3.2%                                                                                                         |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Semiconductor Equipment - 0.4%                                                                                                                              |   |          |   |   |   |
|                                                                                                                                                                                                    | 274,845   |   |   | ASML Holding NV (A.D.R.)                                                                                                                                    | $      | 18,692,208    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Semiconductors - 2.8%                                                                                                                                       |   |          |   |   |   |
|                                                                                                                                                                                                    | 342,046   |   |   | Altera Corp.                                                                                                                                                | $      | 12,132,372    |   |   |   |
|                                                                                                                                                                                                    | 1,329,525 |   |   | Analog Devices, Inc.                                                                                                                                        |   | 61,809,617    |   |   |   |
|                                                                                                                                                                                                    | 821,542   |   |   | Intel Corp.                                                                                                                                                 |   | 17,950,693    |   |   |   |
|                                                                                                                                                                                                    | 398,917   |   |   | Maxim Integrated Products, Inc.                                                                                                                             |   | 13,024,640    |   |   |   |
|                                                                                                                                                                                                    | 927,800   |   |   | Xilinx, Inc.                                                                                                                                                |   | 35,414,126    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 140,331,448   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Semiconductors & Semiconductor Equipment                                                                                                          | $      | 159,023,656   |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Telecommunication Services - 0.9%                                                                                                                           |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Integrated Telecommunication Services - 0.9%                                                                                                                |   |          |   |   |   |
|                                                                                                                                                                                                    | 224,300   |   |   | AT&T, Inc.                                                                                                                                              | $      | 8,229,567     |   |   |   |
|                                                                                                                                                                                                    | 802,591   |   |   | Verizon Communications, Inc.                                                                                                                                |   | 39,447,348    |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        | $      | 47,676,915    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Telecommunication Services                                                                                                                            | $      | 47,676,915    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Utilities - 0.5%                                                                                                                                            |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Electric Utilities - 0.5%                                                                                                                                   |   |          |   |   |   |
|                                                                                                                                                                                                    | 476,200   |   |   | American Electric Power Co., Inc.                                                                                                                           | $      | 23,157,606    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Total Utilities                                                                                                                                             | $      | 23,157,606    |   |   |   |
|                                                                                                                                                                                                    |      |   |   | TOTAL COMMON STOCKS                                                                                                                                         |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | (Cost $3,046,976,948)                                                                                                                                       | $      | 5,012,279,745 |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | TOTAL INVESTMENT IN SECURITIES - 100.0%                                                                                                                     |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | (Cost $3,046,976,948) (a)                                                                                                                                   | $      | 5,012,279,745 |   |   |   |
|                                                                                                                                                                                                    |      |   |   | OTHER ASSETS & LIABILITIES - 0.0%                                                                                                                       | $      | (999,731)     |   |   |   |
|                                                                                                                                                                                                    |      |   |   | TOTAL NET ASSETS - 100.0%                                                                                                                                   | $      | 5,011,280,014 |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
|                                                                                                                                                                                                    | *         |   |   | Non-income producing security.                                                                                                                              |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
|                                                                                                                                                                                                    | (A.D.R.)  |   |   | American Depositary Receipts.                                                                                                                               |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
|                                                                                                                                                                                                    | +         |   |   | Investment held by the Fund representing 5% or more of the outstanding voting stock of such company.  See Notes to Financial Statements - Note 6. |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
|                                                                                                                                                                                                    | (a)       |   |   | At March 28, 2013, the net unrealized gain on investments based on                                                                                          |   |          |   |   |
|                                                                                                                                                                                                    |      |   |   | cost for federal income tax purposes of $3,051,709,679 was as follows:                                                                                      |   |          |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Aggregate gross unrealized gain for all investments in which                                                                                                |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | there is an excess of value over tax cost                                                                                                                   | $      | 1,979,053,026 |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Aggregate gross unrealized loss for all investments in which                                                                                                |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | there is an excess of tax cost over value                                                                                                                   |   | (18,482,960)  |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   | Net unrealized gain                                                                                                                                         | $      | 1,960,570,066 |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
| Various inputs are used in determining the value of the Fund’s investments.  These inputs are summarized in the three broad levels listed below.                                        |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
| Level 1 – quoted prices in active markets for identical securities                                                                                                                                |      |   |   |                                                                                                                                                        |   |
| Level 2 – other significant observable inputs (including quoted prices for similar securities, interest rates, prepayment speeds, credit risk, etc.) See Notes to Financial Statements - Note 1A. |
| Level 3 – significant unobservable inputs (including the Fund’s own assumptions in determining fair value of investments) See Notes to Financial Statements - Note 1A.                      |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
| Generally, equity securities are categorized as Level 1, fixed income securities and senior loans as Level 2 and securities valued                                                                      |
| using fair value methods (other than prices supplied by independent pricing services) as Level 3.  See Notes to Financial Statements - Note 1A.                                               |
|                                                                                                                                                                                                    |      |   |   |                                                                                                                                                        |   |          |   |   |   |
| The following is a summary of the inputs used as of March 28, 2013, in valuing the Fund’s investments:                                                                                            |      |   |

```

```

```

```

|          |   | Level 1 |          |   | Level 2 |   |   | Level 3 |   |   | Total |   |
|---------------|--------|---------|---------------|--------|---------|--------|--------|---------|--------|--------|-------|--------|
| Common Stocks |   | $       | 5,012,279,745 |   |    | $      | -      |    |   | $      | -     |   |   | $ | 5,012,279,745 |   |
| Total         |   | $       | 5,012,279,745 |   |    | $      | -      |    |   | $      | -     |   |   | $ | 5,012,279,745 |   |

```

ITEM 2. CONTROLS AND PROCEDURES.

(a) Disclose the conclusions of the registrant's principal executive
and principal financial officers, or persons performing similar functions,
regarding the effectiveness of the registrant's disclosure
controls and procedures (as defined in Rule 30a-3(c) under the Act (17 CFR
270.30a-3(c))) as of a date within 90 days of the filing date of the report
that includes the disclosure required by this paragraph, based on the
evaluation of these controls and procedures required by Rule 30a-3(b)
under the Act (17 CFR 270.30a-3(b))) and Rule 13a-15(b) or 15d-15(b)
under the Exchange Act (17 CFR 240.13a-15(b) or 240.15d-15(b)).

The registrant's principal executive officer and principal financial officer
have concluded that the registrant's disclosure controls and procedures are
effective based on their evaluation of these controls and procedures as of
a date within 90 days of the filing date of this report.

(b) Disclose any change in the registrant's internal controls over financial
reporting (as defined in Rule 30a-3(d) under the Act (17 CFR 270.30a-3(d))
that occurred during the registrant's last fiscal quarter that has materially
affected, or is reasonably likely to materially affect, the registrant's
internal control over financial reporting.

There were no significant changes in the registrant's internal control over
financial reporting that occurred during the second fiscal quarter of the
period covered by this report that have materially affected, or are
reasonably likely to materially affect, the registrant's internal control
over financial reporting.

ITEM 3. EXHIBITS.

(a) A separate certification for each principal executive officer and principal
financial officer of the registrant as required by Rule 30a-2(a) under the Act
(17 CFR 270.30a-2(a)).

Filed herewith.

<PAGE>

                                   SIGNATURES

                          [See General Instruction F]

Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment Company Act of 1940, the registrant has duly caused this report to be
signed on its behalf by the undersigned, thereunto duly authorized.

(Registrant) Pioneer Fund

By (Signature and Title)* /s/ John F. Cogan, Jr.
John F. Cogan, Jr, President

Date May 30, 2013

Pursuant to the requirements of the Securities Exchange Act of 1934 and the
Investment Company Act of 1940, this report has been signed below by the
following persons on behalf of the registrant and in the capacities and on the
dates indicated.

By (Signature and Title)* /s/ John F. Cogan, Jr.
John F. Cogan, Jr., President

Date May 30, 2013

By (Signature and Title)* /s/ Mark Bradley
Mark Bradley, Treasurer

Date May 30, 2013

* Print the name and title of each signing officer under his or her signature.
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