PIONEER THREE
N-30B-2, 1995-11-29
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<PAGE>

Dear Fellow Shareowners, 
 ----------------------------------------------------------------------------- 

Pioneer Three completed its 13th fiscal year on September 30, 1995. Investors 
welcomed a much-improved environment for stock investing as the period 
progressed -- particularly when compared to the lackluster results of 1994. 
Financial markets reached record levels as long-term interest rates moved 
lower and then stabilized. Your Fund also gained solid ground, providing a 
strong total return and consistent dividend payments for the year. 

                     Pioneer Three's Performance Results 

For the 12 months ended September 30, 1995, Pioneer Three offered 
shareowners: 

 (bullet) A total return of 16.24% based on net asset value. Total return 
          represents the change in net asset value per share and assumes the 
          reinvestment of all distributions at net asset value. 

 (bullet) Dividends totaling $0.23, and a capital gains distribution of 
          $1.145. 

 (bullet) Net asset value per share of $21.48 on September 30, 1995, versus 
          $19.92 one year earlier, even after the payment of distributions. 

For additional performance information, please turn to page 4. 

                            Interest Rates Played 
                       Major Role in Financial Markets 

Rising interest rates troubled financial markets in 1994 -- including the 
first quarter of your Fund's fiscal year -- as evidenced by the negative 
returns posted by many market indexes. The Federal Reserve (the Fed), trying 
to quell fears of inflation, raised short-term interest rates in November 
1994 to 5.5%. Investors, however, showed just as much apprehension toward 
higher interest rates as they did toward potential inflation, especially 
since economic indicators gave mixed messages on the economy's strength. As a 
result, turmoil in financial markets continued. 

As economic growth -- and inflationary fears -- continued, the Fed again 
intervened, pushing short- term interest rates to a three-year high of 6% on 
February 1. Investors this time applauded the hike, however, seeing it as a 
commitment to keep inflation low and to prevent the economy from growing too 
quickly. When signs of a slowing economy began to surface, long-term rates 
came down and created a better climate for investing. 

United States' financial markets reflected this shift and posted unusually 
strong returns. The Dow Jones Industrial Average of 30 large-capitalization 
stocks gained 27.93% for the year ended September 30. The Russell 2500 Index, 
an unmanaged measure of small- and medium-sized company stocks, closed the 
year with a gain of 25.48%. Large-capitalization technology stocks led the 
way, with issues hitting record-high prices. Financial stocks also were big 
gainers, thanks to a number of consolidations within the industry, as well as 
lower interest rates. Interest rates, in fact, worked so well to abate 
inflationary fears and to slow the economy that the Fed lowered the benchmark 
federal funds rate by 0.25 percentage points on July 6 to prevent the economy 
from slowing too significantly. This latest Fed intervention also was well 
received by investors, further benefiting financial markets. 

                     How Pioneer Managed Your Investment 

Pioneer Three invests primarily in small- and medium-sized companies that 
pursue capital growth and make regular dividend payments. This dual 
investment objective, however, meant the Fund couldn't fully participate in 
the gains many high-growth stocks experienced over the year; therefore, the 
Fund's return did not match that of some unmanaged indexes. Keep in mind, 
however, that the Fund's selection process does have the benefit of lowering 
the portfolio's volatility versus the overall stock market. The technology 
sector is a good case in point; because these typically volatile companies 
tend to offer growth potential only and do not pay much -- if anything -- in 
the way of dividends, few of these stocks made their way into Pioneer Three's 
portfolio. We are pleased to note, however, that the 

<PAGE>
 
technology stocks that did meet your Fund's investment criteria performed 
well over the past year. One standout was Marshall Industries, a 
semiconductor distributor. 

Your management looks for value in terms of strong balance sheets and income 
statements, high-quality management with a personal stake in the company, and 
low stock prices in relation to assets and earning power. We prefer companies 
that should progress regardless of external conditions; however, we also 
review how the economy may affect industries. Consider, for example, the 
consumer non-durables sector, specifically the retail industry. Over the past 
year, retail sales generally were stagnant, reflecting the slow economy and a 
lack of consumer confidence. We reduced Pioneer Three's exposure to consumer 
non-durables, particularly apparel-related companies, over the past 12 
months, and instead added to the Fund's holdings in other, less-economically 
sensitive areas. An exception was Consolidated Stores, a retailer that sells 
discounted and "close-out" merchandise in over 400 stores. The company, which 
continues to show its ability to buy and sell merchandise throughout various 
economic cycles, has been a profitable investment for your Fund. We are 
confident it will further contribute to your Fund's performance moving 
forward. 

The healthcare industry remains an important part of Pioneer Three's 
portfolio. The Fund's largest holding, Boston Scientific, falls in this 
category; during the year the company acquired SciMed Life Systems (a maker 
of disposable medical devices), which the Fund also held before the takeover. 
We kept Boston Scientific after it bought SciMed Life, as we have been 
pleased with the company's performance and expect its strong results to 
continue. We also have been pleased with the majority of the portfolio's 
other healthcare holdings, many of which we added as a result of last year's 
concern over industry reforms. Late in the Fund's fiscal year, the group 
rebounded and we took gains, scaling back the Fund's positions in several 
medical equipment companies we believe hit, or were coming close to, full 
value. The Fund's more recent investments in this area are concentrated in 
nursing homes and rehabilitation facilities, including MediSense, Integrated 
Health Services and Sun Healthcare. 

At present, the Fund also holds a number of insurance investments we think 
represent good value. The industry as a whole has performed strongly in 1995, 
due in large part to lower interest rates coupled with low company 
valuations. The Fund holds a sizable weighting in American Bankers Insurance 
Group, a seller of credit-related insurance products, and Selective Insurance 
Group, a provider of automobile and home insurance. The accompanying chart 
shows the Fund's investments, categorized by industry, at the close of the 
fiscal year. 

[Plot points for pie chart] 

                             Sector Distribution 
                      (Percentage of equity investments 
                          as of September 30, 1995) 

Services 18%  
Financial 13% 
Consumer Non-Durables 16% 
Consumer Durables 5%
Capital Goods 17%  
Other 8%
Energy 6% 
Basic Industries 8%  
Technology 9% 

Looking Ahead 

In 1995, the various events that hindered financial markets in 1994 were 
replaced with significantly improved market conditions and renewed investor 
optimism. While the market cannot sustain such a scorching upward pace 
forever, 1995 already has well rewarded investors. 

In our last annual report to you we emphasized that successful investors 
maintain a long-term outlook. While the Fund and stock market have been 
strong over much of the past year, they both will continue to be influenced 
by near-term conditions and will experience day-to-day price swings. 
Investors should not 

                                      2 
<PAGE>
 
try to "time the market." Instead, look at an investment's long-term 
potential, just as your Fund's management does. We will continue to monitor 
and adjust the Fund's portfolio to maintain a collection of well-valued 
small- and mid-sized stocks we think will be solid investments moving 
forward. We are confident that Pioneer Three's diversified holdings, and our 
value approach to investing, will create solid long-term results. 

Please refer to the following pages for the audited list of the Fund's 
portfolio holdings and financial statements as of September 30, 1995. If you 
have any questions about your investment in Pioneer Three, please contact 
your investment representative, or call Pioneer at 1-800-225-6292. Thank you 
for your continued support. 

Respectfully, 

/s/ John F. Cogan, Jr. 


John F. Cogan, Jr. 
Chairman and President, 
Pioneer Three 

November 3, 1995 


                                      3 

<PAGE>
 
Growth of a $10,000 Investment 

   This chart shows the growth of a $10,000 investment made in Pioneer Three 
at public offering price, compared with the growth of the Russell 2500 Index. 

 

[Plot points for line chart] 


   PIONEER THREE: 
Average Annual Total Returns 
(as of September 30, 1995) 
<TABLE>
<CAPTION>
                              Net Asset     Public Offering 
        Time Period             Value           Price* 
<S>                           <C>            <C>
- --------------------------    ------------   --------------- 
Life-of-Fund (11/19/82)         13.45%           12.93% 
  10 Years                      12.91            12.24 
   5 Years                      18.01            16.62 
   1 Year                       16.24             9.53 
</TABLE>


9/85 10000  9425 
9/86 12828 11350 
9/87 16737 14472 
9/88 15225 13616 
9/89 18911 17199 
9/90 14316 13865 
9/91 21021 18828 
9/92 23190 21662 
9/93 30167 26604 
9/94 31038 27302 
9/95 38947 31735 
 

*Reflects deduction of the maximum 5.75% sales charge at the beginning of the 
 period and assumes reinvestment of all distributions at net asset value. 

The Russell 2500 Index is an unmanaged, market-weighted measure of stock 
market performance. It contains stocks of the 2,500 smallest publicly traded 
companies. The largest company in the Index has a market capitalization of 
approximately $3.7 billion. Index returns assume reinvestment of dividends 
and, unlike Fund returns, do not reflect any fees, expenses or sales charges. 
Investors cannot directly invest in the Index. 

Past performance does not guarantee future results. Return and principal 
fluctuate so that an investor's shares, when redeemed, may be worth more or 
less than their original cost. 

                                      4 



<PAGE>
          SCHEDULE OF INVESTMENTS-PIONEER THREE-September 30, 1995
<TABLE>
<CAPTION>
   Shares                                                        Value 
                           COMMON STOCKS--91.8% 
                          BASIC INDUSTRIES--7.7% 
                             Chemicals--2.0% 
<S>           <C>                                             <C>
155,000       Cambrex Corp.                                   $  6,238,750 
198,600       Crompton & Knowles Corp.                           2,954,175 
331,850       The Dexter Corp.                                   8,462,175 
170,700       The Geon Co.                                       4,352,850 
                                                               ------------ 
                                                              $ 22,007,950 
                                                               ------------ 
                          Forest Products--1.1% 
299,135       Potlatch Corp.                                  $ 12,227,143 
                                                               ------------ 
                            Iron & Steel--2.5% 
510,300       Armco, Inc.                                     $  3,316,950 
721,000       Chaparral Steel Co.                                7,750,750 
151,700       Harsco Corp.                                       8,438,312 
602,500       Intermet Corp.                                     6,778,125 
 56,000        NS Group, Inc.*                                      168,000 
                                                               ------------ 
                                                              $ 26,452,137 
                                                               ------------ 
                           Paper Products--0.6% 
134,750       Pentair, Inc.                                   $  6,063,750 
                                                               ------------ 
                         Pollution & Waste--1.0% 
433,200       Applied Bioscience International, Inc.*         $  2,761,650 
107,600       Gundle Environmental Systems, Inc.*                  800,275 
290,300       Zurn Industries, Inc.                              7,366,362 
                                                               ------------ 
                                                              $ 10,928,287 
                                                               ------------ 
                          Precious Metals--0.5% 
464,700       Hecla Mining Co.*                               $  5,634,487 
                                                               ------------ 
                 Total Basic Industries                       $ 83,313,754 
                                                               ------------ 
                           CAPITAL GOODS--15.2% 
                     Construction & Engineering--3.5% 
280,100       Granite Construction, Inc.                      $  7,562,700 
148,350       Hughes Supply, Inc.                                3,560,400 
467,975       Ply-Gem Industries, Inc.                           8,891,525 
633,750       RPM, Inc.                                         12,595,781 
387,700       The Ryland Group, Inc.                             6,009,350 
                                                               ------------ 
                                                              $ 38,619,756 
                                                               ------------ 
                          Producer Goods--11.7% 
525,000       Castech Aluminum Group, Inc.*                   $  8,465,625 
322,150       CLARCOR, Inc.                                      7,570,525 
445,000       DT Industries, Inc.                                6,118,750 
413,000       The Duriron Co., Inc.                             12,080,250 
172,900       Farrel Corp.                                         778,050 
558,480       Federal Signal Corp.                              12,426,180 
199,600       Ferrofluidics Corp.*                               2,395,200 
203,300       Finning, Ltd.                                      3,207,458 
425,000       Greenfield Industries                             13,068,750 
396,400       Kennametal, Inc.                                  14,369,500 
257,251       Keystone International, Inc.                       5,530,896 
227,800       Kimball International, Inc. (Class B)              6,378,400 
898,000       Regal-Beloit Corporation                          16,725,250 
465,800       Shelby Williams Industries, Inc.+                  6,055,400 
477,400       Watts Industries, Inc. (Class A)                  11,875,325 
                                                               ------------ 
                                                              $127,045,559 
                                                               ------------ 
                 Total Capital Goods                          $165,665,315 
                                                               ------------ 

The accompanying notes are an integral part of these financial statements. 

                                      5 

<PAGE>
 
                            CONSUMER DURABLES--4.8%
                             Consumer Durables--0.7%
301,000       Leggett & Platt, Inc.                           $  7,412,125 
                                                               ------------ 

                              Motor Vehicles--4.1%
314,400       Arvin Industries, Inc.                          $  6,720,300 
323,000       Gentex Corp.*                                      7,752,000 
512,000       Hi-Lo Automotive, Inc.*                            3,712,000 
202,800       Modine Manufacturing Co.                           5,779,800 
707,012       Simpson Industries, Inc.                           6,981,748 
313,400       Standard Motor Products, Inc.                      5,954,600 
800,000       TBC Corp.*                                         7,700,000 
                                                               ------------ 
                                                              $ 44,600,448 
                                                               ------------ 
                 Total Consumer Durables                      $ 52,012,573 
                                                               ------------ 
                          CONSUMER NON-DURABLES--14.7%
                            Agriculture & Food--0.7%
208,950       Flowers Industries, Inc.                        $  4,309,594 
195,500       Thorn Apple Valley, Inc.                           3,665,625 
                                                               ------------ 
                                                              $  7,975,219 
                                                               ------------ 
                             Consumer Luxuries--0.8%
347,300       Huffy Corp.                                     $  3,950,537 
240,800       Outboard Marine Corp.                              5,177,200 
                                                               ------------ 
                                                              $  9,127,737 
                                                               ------------ 
                                Retail Food--0.6%
244,000       Ruddick Corp.                                   $  6,588,000 
                                                               ------------ 
                              Retail Non-Food--8.2%
751,500       Arbor Drugs, Inc.                               $ 14,090,625 
390,000       Catherines Stores*+                                4,582,500 
104,800       Cato Corp. (Class A)                                 746,700 
734,900       CML Group, Inc.                                    5,144,300 
742,300       Consolidated Stores Corp.*                        17,165,688 
700,000       Designs, Inc.*                                     5,425,000 
513,000       Family Dollar Stores, Inc.                         9,747,000 
166,000       Fingerhut Companies, Inc.                          2,676,750 
315,000       Fred Meyer, Inc.*                                  7,717,500 
455,700       MicroAge, Inc.*                                    5,069,663 
826,464       Pier 1 Imports, Inc.                               8,367,948 
443,600       Russ Berrie and Company, Inc.                      6,764,900 
221,100       Vans, Inc.*                                        1,602,975 
                                                               ------------ 
                                                              $ 89,101,549 
                                                               ------------ 
                             Textiles/Clothes--4.4%
299,200       Angelica Corp.                                  $  7,517,400 
450,000       Cone Mills Corp.*                                  6,018,750 
377,100       Crown Crafts, Inc.                                 4,902,300 
 75,400       Cutter & Buck Inc.*                                  556,075 
448,400       Guilford Mills, Inc.                              10,873,700 
550,000       Paragon Trade Brands, Inc.*                        8,525,000 
368,212       Unifi, Inc.                                        9,021,194 
                                                               ------------ 
                                                              $ 47,414,419 
                                                               ------------ 
                 Total Consumer Non-Durables                  $160,206,924 
                                                               ------------ 

The accompanying notes are an integral part of these financial statements. 

                                      6 

<PAGE>
 
                               ENERGY--5.7% 
                            Oil Services--2.4% 
558,300       Enterra Corp.*                                  $ 12,282,600 
390,000       Matrix Service Co.*                                1,730,625 
788,300       Oceaneering International, Inc.*                   8,572,762 
352,900       Stolt Comex Seaway S.A.*                           3,837,788 
                                                               ------------ 
                                                              $ 26,423,775 
                                                               ------------ 
                        Oil & Gas Extraction--3.3% 
691,518       Anderson Exploration Ltd.*                      $  6,481,858 
171,900       Diamond Shamrock, Inc.                             4,233,038 
502,700       Plains Resources, Inc.*                            3,990,181 
244,000       Seagull Energy Corp.*                              4,941,000 
112,600       Southwestern Energy Co.                            1,534,175 
478,100       Vintage Petroleum, Inc.                           10,040,100 
1,096,400     Wainoco Oil Corp.*                                 4,111,500 
                                                               ------------ 
                                                              $ 35,331,852 
                                                               ------------ 
                 Total Energy                                 $ 61,755,627 
                                                               ------------ 
                             FINANCIAL--11.6% 
                          Commercial Bank--3.6% 
442,500       Magna Group, Inc.                               $ 10,730,625 
309,200       Meridian Bancorp, Inc.                            11,826,900 
425,801       Old Kent Financial Corp.                          16,233,663 
                                                               ------------ 
                                                              $ 38,791,188 
                                                               ------------ 
                         Insurance-General--2.2% 
475,000       American Bankers Insurance Group, Inc.          $ 17,693,750 
463,200       Western National Corp.                             6,369,000 
                                                               ------------ 
                                                              $ 24,062,750 
                                                               ------------ 
                         Non-Life Insurance--4.7% 
936,900       Allmerica Property & Casualty Companies, Inc.   $ 22,368,488 
530,000       Guaranty National Corp.                            8,811,250 
413,000       Selective Insurance Group, Inc.                   15,074,500 
563,712       Willis Corroon Group Plc (A.D.R.)                  5,566,656 
                                                               ------------ 
                                                              $ 51,820,894 
                                                               ------------ 
                           Savings & Loan--0.8% 
275,000       Albank Financial Corp.                          $  8,250,000 
                                                               ------------ 
                          Misc. Financial--0.3% 
262,900       DVI, Inc.*                                      $  3,614,875 
                                                               ------------ 
                 Total Financial                              $126,539,707 
                                                               ------------ 
                             SERVICES--16.8% 
                  Health Services & Personal Care--11.7% 
370,900       Allied Healthcare Products+                     $  6,815,288 
421,100       American Healthcorp, Inc.*+                        2,947,700 
558,560       Bergen Brunswig Corp. (Class A)                   11,939,220 
507,300       BioWhittaker, Inc.*                                3,931,575 
653,121       Boston Scientific Corporation*                    27,839,283 
550,000       Coastal Physician Group, Inc.*                     9,625,000 
384,199       Community Health Systems, Inc.*                   15,512,035 
 81,495       Healthdyne Technologies, Inc.*                     1,110,369 
375,000       Integrated Health Services, Inc.*                 10,593,750 
410,000       Lincare Holdings, Inc.*                           10,557,500 
600,000       MediSense, Inc.*                                  14,475,000 
300,000       Owen Healthcare, Inc.*                             4,893,750 
575,000       Sun Healthcare Group, Inc.*                        7,403,125 
                                                               ------------ 
                                                              $127,643,595 
                                                               ------------ 

The accompanying notes are an integral part of these financial statements. 

                                      7 

<PAGE>
 
                          Pharmaceuticals--1.4% 
925,800       Medeva Plc (A.D.R.)                             $ 15,044,250 
                                                               ------------ 
                             Publishing--0.9% 
210,000       Houghton Mifflin Company                        $  9,765,000 
                                                               ----------- 
                              Services--2.8% 
493,600       The Interpublic Group of Companies, Inc.        $ 19,620,600 
288,100       Ideon Group, Inc.                                  2,953,025 
360,500       New England Business Service, Inc.                 7,435,312 
                                                               ------------ 
                                                              $ 30,008,937 
                                                               ------------ 
                 Total Services                               $182,461,782 
                                                               ------------ 
                             TECHNOLOGY--8.7% 
                         Business Machines--2.5% 
900,000       Data General Corp.*                             $  9,337,500 
446,000       National Computer Systems, Inc.                    9,589,000 
300,000       Stratus Computer, Inc.*                            7,875,000 
                                                               ------------ 
                                                              $ 26,801,500 
                                                               ------------ 
                         Computer Software--1.5% 
450,000       BancTec, Inc.*                                  $  9,675,000 
630,000       Banyan Systems, Inc.*                              6,378,750 
                                                               ------------ 
                                                              $ 16,053,750 
                                                               ------------ 
                            Electronics--4.7% 
606,015       Baldor Electric Co.                             $ 15,226,127 
218,600       Belden, Inc.                                       5,738,250 
 87,500       Intergraph Corp.*                                  1,060,938 
285,000       Kuhlman Corp.                                      3,455,625 
249,100       Marshall Industries*                               9,403,525 
690,000       Micro Focus Group Plc (A.D.R.)*                    7,762,500 
302,100       Whittaker Corp.*                                   5,815,425 
318,900       Zenith Electronics Corp.*                          2,750,513 
                                                               ------------ 
                                                              $ 51,212,903 
                                                               ------------ 
                 Total Technology                             $ 94,068,153 
                                                               ------------ 
                           TRANSPORTATION--3.3% 
                           Air Transport--1.0% 
444,600       Airborne Freight Corp.                          $ 10,892,700 
                                                               ------------ 
                          Ships & Shipping--1.4% 
507,900       American President Companies, Ltd.              $ 14,856,075 
                                                               ------------ 
                     Truck Transport & Storage--0.9% 
880,000       Arkansas Best Corp.                             $ 10,450,000 
                                                               ------------ 
                 Total Transportation                         $ 36,198,775 
                                                               ------------ 
                             UTILITIES--3.3% 
                            Gas Utility--2.2% 
591,300       KN Energy, Inc.                                 $ 16,112,925 
274,300       Peoples Energy Corp.                               7,543,250 
                                                               ------------ 
                                                              $ 23,656,175 
                                                               ------------ 
                           Utility/Other--1.1% 
373,000       Eastern Enterprises                             $ 11,982,625 
                                                               ------------ 
                 Total Utilities                              $ 35,638,800 
                                                               ------------ 
                 TOTAL COMMON STOCKS (Cost $706,166,519) (a)  $997,861,410 
                                                               ------------ 
</TABLE>

The accompanying notes are an integral part of these financial statements. 

                                      8 
<PAGE>
 
<TABLE>
<CAPTION>
  Principal 
    Amount                                                                 Value 
- -------------                                                           ------------- 
                        TEMPORARY CASH INVESTMENTS--8.2%
<S>             <C>                                                   <C>
$13,236,000     Commercial Credit Co., 5.72%, 10/2/95                 $   13,254,924 
 12,104,000     Ford Motor Credit Co., 5.74%, 10/3/95                     12,115,594 
 15,217,000     Norwest Financial Inc., 5.72%, 10/4/95                    15,229,104 
 19,473,000     Prudential Funding Corp., 5.76%, 10/5/95                  19,485,479 
 13,850,000     Exxon Credit Corp., 5.76%, 10/6/95                        13,856,657 
 14,729,000     Associates Corp. of North America, 5.98%, 10/10/95        14,733,902 
                                                                        ------------- 
                  TOTAL TEMPORARY CASH INVESTMENTS (Cost $88,609,000) $   88,675,660 
                                                                        ------------- 
                  TOTAL INVESTMENT IN SECURITIES AND TEMPORARY 
                  CASH INVESTMENTS--100.0% (Cost $794,775,519)        $1,086,537,070 
                                                                        ============= 
</TABLE>

  * Non-income producing security. 
  + Investments held by the Fund representing 5% or more of the outstanding 
    voting stock of such company (see Note 5). 
(a) At September 30, 1995, the net unrealized gain on investments based on 
    cost for federal income tax purposes of $706,166,519 was as follows: 

<TABLE>
<CAPTION>
<S>                                                                                    <C>
  Aggregate gross unrealized gain for all investments in which there is an excess of 
  value over tax cost ...............................................................  $356,662,977 
  Aggregate gross unrealized loss for all investments in which there is an excess of 
  tax cost over value ...............................................................   (64,968,086) 
                                                                                        ------------ 
  Net unrealized gain...............................................................   $291,694,891 
                                                                                        ============ 
</TABLE>

Purchases and sales of securities (excluding temporary cash investments) for 
the year ended September 30, 1995 aggregated approximately $184,933,000 and 
$300,257,000, respectively. 

                      BALANCE SHEET--SEPTEMBER 30, 1995 
               (Dollars In Thousands Except Per Share Amounts) 

<TABLE>
<CAPTION>
<S>                                                                                           <C>
 ASSETS: 
 Investment in securities, at value (including temporary cash investment of $88,676) (cost 
  $794,776; see Schedule of Investments and Notes 1 and 5)..................................  $1,086,537 
 Receivables-- 
  Investment securities sold................................................................       2,033 
  Dividends.................................................................................       1,021 
  Trust shares sold.........................................................................         207 
 Other......................................................................................          32 
                                                                                                ---------- 
   Total assets.............................................................................  $1,089,830 
                                                                                                ---------- 
Liabilities: 
 Payables-- 
  Investment securities purchased...........................................................  $    6,072 
  Trust shares repurchased..................................................................         557 
  Due to bank...............................................................................         168 
 Accrued expenses-- 
  Management fees (Note 2)..................................................................          68 
  Other (Notes 2, 3 and 4)..................................................................         811 
                                                                                                --------- 
   Total liabilities........................................................................  $    7,676 
                                                                                                ---------- 
NET ASSETS: 
 Paid-in capital (Note 1)...................................................................  $  712,460 
 Accumulated undistributed net investment income............................................       6,320 
 Accumulated undistributed net realized gain on investments (Note 1)........................      71,679 
 Net unrealized gain on investments.........................................................     291,695 
                                                                                                ---------- 
  Total net assets (equivalent to $21.48 per share based on 50,390,819 shares 
   outstanding--unlimited number of shares authorized)......................................  $1,082,154 
                                                                                                ========== 
</TABLE>
The accompanying notes are an integral part of these financial statements. 

                                      9

<PAGE>
 
                            STATEMENT OF OPERATIONS
                      For the Year Ended September 30, 1995
                             (Dollars in Thousands)

<TABLE>
<CAPTION>
<S>                                                                <C>
 INVESTMENT INCOME (Note 1): 
 Dividends (net of foreign taxes withheld of $58)                  $ 17,273 
 Interest                                                             2,593 
 Other (Note 6)                                                         750 
                                                                    -------- 
  Total investment income                                          $ 20,616 
                                                                    -------- 

Expenses: 
 Management fees (Note 2)                                          $  4,701 
 Distribution fees (Note 4)                                           1,799 
 Transfer agent fees (Note 3)                                         1,705 
 Registration fees                                                       50 
 Professional fees                                                       82 
 Accounting (Note 2)                                                     98 
 Custodian fees                                                          83 
 Printing                                                                55 
 Fees and expenses of nonaffiliated trustees                             46 
 Miscellaneous                                                           56 
                                                                    -------- 
  Total expenses                                                   $  8,675 
   Less fees paid indirectly (Note 7)                                   (70) 
                                                                    -------- 
   Net expenses                                                    $  8,605 
                                                                    -------- 
   Net investment income                                           $ 12,011 
                                                                    -------- 
Realized and Unrealized Gain on Investments: 
 Net realized gain on investments (Note 1)                         $ 76,657 
 Change in net unrealized gain on investments                        66,524 
                                                                    -------- 
  Net gain on investments                                          $143,181 
                                                                    -------- 
   Net increase in net assets resulting from operations            $155,192 
                                                                    ======== 
</TABLE>

                     STATEMENTS OF CHANGES IN NET ASSETS 
               For the Years Ended September 30, 1995 and 1994 
               (Dollars in Thousands Except Per Share Amounts) 

<TABLE>
<CAPTION>
                                                                                        1995         1994 
<S>                                                       <C>           <C>           <C>         <C>
                                                                                      ----------    ---------- 
FROM OPERATIONS: 
 Net investment income                                                                $   12,011  $   12,317 
 Net realized gain on investments                                                         76,657      61,071 
 Change in net unrealized gain on investments                                             66,524     (46,767) 
                                                                                      ----------    ---------- 
  Net increase in net assets resulting from operations                                $  155,192  $   26,621 
                                                                                      ----------    ---------- 
DISTRIBUTIONS TO SHAREHOLDERS FROM: 
 Net investment income ($0.23 and $0.25 per share, respectively)                      $  (11,708) $  (12,441) 
 Net realized gain on investments ($1.15 and $1.51 per share, respectively)              (57,659)    (72,766) 
                                                                                      ----------    ---------- 
  Decrease in net assets resulting from distributions to shareholders                 $  (69,367) $  (85,207) 
                                                                                      ----------    ---------- 
FROM TRUST SHARE TRANSACTIONS: 
                                                                   SHARES 
                                                          ------------------------- 
 Net proceeds from sale of shares                          4,234,630    6,605,985     $   81,319  $  134,158 
 Net asset value of shares issued to shareholders in 
   reinvestment of dividends                               3,754,378    4,067,109         66,582      81,921 
 Cost of shares repurchased                               (8,669,270)  (7,844,246)      (168,805)   (159,319) 
                                                          -----------   -----------   ----------    ---------- 
  Net increase (decrease) in net assets resulting from 
    trust share transactions                                (680,262)   2,828,848     $  (20,904) $   56,760 
                                                          ===========   ===========   ----------    ---------- 
  Net increase (decrease) in net assets                                               $   64,921  $   (1,826) 
NET ASSETS: 
 Beginning of year                                                                     1,017,233   1,019,059 
                                                                                      ----------    ---------- 
 End of year (including accumulated undistributed net investment income of $6,320 
    and $3,251, respectively)                                                         $1,082,154  $1,017,233 
                                                                                      ==========    ========== 
</TABLE>
The accompanying notes are an integral part of these financial statements. 

                                      10
<PAGE>
 
                             FINANCIAL HIGHLIGHTS 
        Selected Data For a Share Outstanding For The Years Presented 

<TABLE>
<CAPTION>
                                                             For the Years Ended September 30, 
                         1995         1994         1993        1992       1991       1990       1989       1988       1987     1986 
<S>                   <C>          <C>          <C>          <C>        <C>        <C>        <C>        <C>        <C>        <C>
Net asset value, 
   beginning of 
   year               $19.92       $21.12       $18.03      $16.16     $12.96    $ 17.80     $15.09     $18.52     $16.01    $13.98 
Increase (decrease) 
   from investment 
   operations: 
 Net investment 
    income            $ 0.24       $ 0.24       $ 0.28      $ 0.33     $ 0.41    $  0.41     $ 0.42     $ 0.30     $ 0.28    $ 0.34 
 Net realized and 
    unrealized gain 
    (loss) on 
    investments         2.70         0.32         3.72        2.04       3.94      (3.56)      3.33      (1.91)      3.76      2.41 
                      ------       ------       ------      ------     ------    --------    ------     -------    ------    ------ 
Total increase 
   (decrease) from 
   investment 
   operations         $ 2.94       $ 0.56       $ 4.00      $ 2.37     $ 4.35    $ (3.15)    $ 3.75     $(1.61)    $ 4.04    $ 2.75 
Distributions to 
   shareholders 
   from: 
 Net investment 
    income             (0.23)       (0.25)       (0.29)      (0.35)     (0.41)     (0.46)     (0.36)     (0.41)     (0.36)    (0.36)
 Net realized gain     (1.15)       (1.51)       (0.62)      (0.15)     (0.74)     (1.23)     (0.68)     (1.41)     (1.17)    (0.36)
Net increase 
   (decrease) in 
  net  asset value    $ 1.56       $(1.20)      $ 3.09      $ 1.87     $ 3.20    $ (4.84)    $ 2.71     $(3.43)    $ 2.51    $ 2.03 
                      ------       -------      ------      ------     ------    --------    ------     -------    ------    ------ 
Net asset value, 
   end of year        $21.48       $19.92       $21.12      $18.03     $16.16    $ 12.96     $17.80     $15.09     $18.52    $16.01 
                      ======       ======       ======      ======     ======    ========    ======     =======    ======    ====== 
Total return*          16.24%        2.62%       22.82%      15.05%     35.80%    (19.39%)    26.32%     (6.00%)    27.50%    20.40%
Ratio of net 
   operating 
   expenses to 
   average net 
  assets                0.85%**      0.86%        0.84%       0.85%      0.74%      0.71%      0.72%      0.76%      0.68%    0.71%
Ratio of net 
   investment 
   income to  
   average net 
   assets               1.18%**      1.19%        1.43%       1.85%      2.72%      2.58%      2.56%      2.15%      1.74%    2.41%
Porfolio turnover 
   rate                   19%          15%          18%         12%         5%        14%        16%        12%        23%      24%
Net assets, 
   end of year (in
   thousands)      $1,082,154   $1,017,233   $1,019,059   $779,631   $692,344   $562,343   $752,135   $616,953   $734,300  $543,173
</TABLE>

- ----------------
 * Assumes initial investment at net asset value at the beginning of each 
   year, reinvestment of all distributions, the complete redemption of the 
   investment at the net asset value at the end of each year and no sales 
   charges. Total return would be reduced if sales charges were taken into 
   account. 

** Ratios include expenses paid through certain expense offset arrangements. 
   Exclusion of such offset arrangements has no effect on these ratios. 

The accompanying notes are an integral part of these financial statements. 

                                      11

<PAGE>
 
NOTES TO FINANCIAL STATEMENTS--September 30, 1995 
 ----------------------------------------------------------------------------- 
1. Pioneer Three (the Fund) is a Massachusetts business trust registered 
under the Investment Company Act of 1940 as a diversified, open-end 
management investment company. The following is a summary of significant 
accounting policies consistently followed by the Fund, which are in 
conformity with those generally accepted in the investment company industry. 

    A. Security Valuation -- Security transactions are recorded on trade 
  date. Each day, securities are valued at the last sale price on the 
  principal exchange where they are traded. Securities that have not traded 
  on the date of valuation, or securities for which sale prices are not 
  generally reported, are valued at the mean between the last bid and asked 
  prices. Securities for which market quotations are not readily available 
  are valued at their fair values as determined by, or under the direction 
  of, the Board of Trustees. Temporary cash investments are valued at 
  amortized cost plus accrued interest, which approximates value. Dividend 
  income is recorded on the ex-dividend date and interest income is recorded 
  on the accrual basis. 

    Gains and losses on sales of investments are calculated on the 
  "identified cost" method for both financial reporting and federal income 
  tax purposes. It is the Fund's practice to first select for sale those 
  securities that have the highest cost and also qualify for long-term 
  capital gain or loss treatment for tax purposes. 

    B. Federal Taxes -- It is the Fund's policy to comply with the 
  requirements of the Internal Revenue Code applicable to regulated 
  investment companies and to distribute all of its taxable income and net 
  realized capital gains, if any, to its shareholders. Therefore, no federal 
  income tax provision is required. 

    The characterization of distributions to shareholders for financial 
  reporting purposes is determined in accordance with federal income tax 
  rules. Therefore, the source of the Fund's distributions may be shown in 
  the accompanying financial statements as either from or in excess of net 
  investment income or net realized gain on investment transactions, or from 
  paid-in capital, depending on the type of book/tax differences that may 
  exist. 

    At September 30, 1995, the Fund reclassified approximately $93,000 and 
  $2,673,000 from paid-in capital and accumulated undistributed net realized 
  gain, respectively, to accumulated undistributed net investment income. 
  This reclassification has no impact on the net asset value of the Fund and 
  is designed to present the Fund's capital accounts on a tax basis. 

    C. Trust Shares -- The Fund records sales and repurchases of its trust 
  shares on the trade date. Net losses, if any, as a result of cancellations 
  are absorbed by Pioneer Funds Distributor, Inc. (PFD), the principal 
  underwriter for the Fund and an indirect subsidiary of The Pioneer Group, 
  Inc. (PGI). PFD earned approximately $185,000 in underwriting commissions 
  on the sale of the Fund's trust shares during the year ended September 30, 
  1995. Distributions to shareholders are recorded as of the ex-dividend 
  date. 

2. Pioneering Management Corporation (PMC), the Fund's investment adviser, 
manages the Fund's portfolio and is a wholly owned subsidiary of PGI. 
Management fees are calculated daily at the annual rate of 0.50% of the 
Fund's average daily net assets up to $250,000,000; 0.48% of the next 
$50,000,000; and 0.45% of excess over $300,000,000. 

 In addition, under the management agreement, certain other services and 
costs, including accounting, regulatory reporting and insurance premiums, are 
paid by the Fund. Included in Accrued expenses -- Other is approximately 
$27,000 in accounting fees payable to PMC at September 30, 1995. 

                                       12
<PAGE>
 
NOTES TO FINANCIAL STATEMENTS--September 30, 1995 (Continued) 
 ----------------------------------------------------------------------------- 

3. Pioneering Services Corporation (PSC), a wholly owned subsidiary of PGI, 
provides substantially all transfer agent and shareholder services to the 
Fund at negotiated rates. Included in Accrued expenses -- Other is 
approximately $184,000 in transfer fees payable to PSC at September 30, 1995. 

4. The Fund adopted a Plan of Distribution (the Plan) that allows for the 
Fund to reimburse PFD for expenditures to finance any activities primarily 
intended to result in the sale of trust shares. The Plan provides for 
reimbursement of such expenditures in an amount not to exceed 0.15% on 
qualifying investments in the Fund made prior to August 19, 1991 and 0.25% on 
qualifying investments made on or subsequent to that date. Included in 
Accrued expenses -- Other is approximately $504,000 in distribution fees 
payable to PFD at September 30, 1995. 

5. The Fund's investment in certain companies may exceed 5% of the 
outstanding voting stock. Such companies are deemed affiliates of the Fund 
for financial reporting purposes. The following summarizes transactions with 
affiliates of the Fund as of September 30, 1995: 


                                   Purchases   Sales    Dividend 
            Affiliates               Cost      Cost      Income      Value 
Allied Healthcare Products             $--      $--     $100,143   $ 6,815,288 
American Healthcorp, Inc.*              --       --        --        2,947,700 
Catherines Stores*                      --       --        --        4,582,500 
Shelby Williams Industries, Inc.        --     26,600    130,522     6,055,400 
                                       ---    -------   --------   ----------- 
TOTAL                                  $--    $26,600   $230,665   $20,400,888 
                                       ===    =======   ========   =========== 

*Non-income producing security 

6. During the year ended September 30, 1995, PMC paid the Fund approximately 
$750,000 as a result of a class action settlement related to one of the 
Fund's portfolio investments. 

7. PMC has entered into certain expense offset arrangements resulting in the 
reduction in the Fund's total expenses. For the year ended September 30, 
1995, transfer agent fees paid in connection with interest earned on account 
balances maintained by the transfer agent were approximately $70,000. 

                                       13
<PAGE>
 
REPORT OF INDEPENDENT PUBLIC ACCOUNTANTS 
 ----------------------------------------------------------------------------- 
TO THE SHAREHOLDERS AND THE BOARD OF TRUSTEES OF PIONEER THREE: 

We have audited the accompanying balance sheet of Pioneer Three, including 
the schedule of investments, as of September 30, 1995, and the related 
statement of operations, statements of changes in net assets and financial 
highlights for the years presented. These financial statements and financial 
highlights are the responsibility of the Fund's management. Our 
responsibility is to express an opinion on these financial statements and 
financial highlights based on our audits. 

We conducted our audits in accordance with generally accepted auditing 
standards. Those standards require that we plan and perform the audit to 
obtain reasonable assurance about whether the financial statements and 
financial highlights are free of material misstatement. An audit includes 
examining, on a test basis, evidence supporting the amounts and disclosures 
in the financial statements. Our procedures included confirmation of 
securities owned as of September 30, 1995 by correspondence with the 
custodian. An audit also includes assessing the accounting principles used 
and significant estimates made by management, as well as evaluating the 
overall financial statement presentation. We believe that our audits provide 
a reasonable basis for our opinion. 

In our opinion, the financial statements and financial highlights referred to 
above present fairly, in all material respects, the financial position of 
Pioneer Three as of September 30, 1995, the results of its operations, the 
changes in its net assets and financial highlights for the years presented, 
in conformity with generally accepted accounting principles. 

                                                           ARTHUR ANDERSEN LLP 

Boston, Massachusetts 
October 27, 1995 
                                       14
<PAGE>
 
TRUSTEES' FEES, PRINCIPAL SHAREHOLDERS AND SHARE OWNERSHIP OF TRUSTEES AND 
OFFICERS (UNAUDITED) 
 ----------------------------------------------------------------------------- 
The aggregate direct remuneration paid by the Fund to nonaffiliated trustees 
and officers during the year ended September 30, 1995 was approximately 
$43,000, plus expenses incurred in attending trustees meetings of 
approximately $4,000. Fees of trustees who are affiliated with or "interested 
persons" of Pioneering Management Corporation and Pioneer Funds Distributor, 
Inc., investment adviser and principal underwriter, respectively, of the Fund 
($1,000 in 1995), are reimbursed to the Fund by Pioneering Management 
Corporation in accordance with the management contract with the Fund. At 
September 30, 1995, the trustees and officers of the Fund owned beneficially 
27,190 shares of the Fund (approximately 0.05% of the outstanding shares). 
The Pioneer Group, Inc., the parent company of Pioneering Management 
Corporation and Pioneer Funds Distributor, Inc., is a publicly-held 
corporation of which Mr. Cogan, Chairman and President of the Fund, owned 
approximately 15% of the outstanding shares of capital stock at September 30, 
1995. 


 ----------------------------------------------------------------------------- 
 TAX TREATMENT OF DISTRIBUTIONS MADE DURING THE YEAR ENDED SEPTEMBER 30, 1995 
 ............................................................................. 

    During the fiscal year ended September 30, 1995, the Fund paid the 
following distributions: 

<TABLE>
<CAPTION>
                                                  Distributions Per Share 
                                                  ----------------------- 
                                             From Net 
   To Shareholders                          Investment          From Net 
      of Record           Payment Date        Income         Realized Gain 
      ---------           ------------        ------         ------------- 
                                                        Short-Term   Long-Term 
                                                        ----------   --------- 
<S>                      <C>                  <C>       <C>          <C>
  December 20, 1994      December 28, 1994    $0.12       $0.192       $0.953 
  June 22, 1995          June 30, 1995         0.11         --           -- 
                                               ----        -----        ----- 
                         TOTAL                $0.23       $0.192       $0.953 
                                              =====       ======       ====== 
</TABLE>

    On a per share basis, the distributions from net realized gain include 
$0.953, which should be reported as long-term capital gain. The remaining 
$0.192 should be combined with the $0.23 distribution from net investment 
income for a total of $0.422, which represents ordinary income. 

    Corporate shareholders may deduct up to 70% of qualifying dividends 
received during the year. For purposes of computing the exclusion, 100% of 
distributions from net investment income represents qualifying dividends. 

    Shareholders who elected to take the Capital Gain Distribution in 
additional shares of the Fund should report the distribution as explained 
above. The tax cost of the shares received on December 28, 1994 is $17.56 per 
share. 
                                       15

<PAGE>
 
                                PIONEER THREE 
                               60 State Street 
                         Boston, Massachusetts 02109 

OFFICERS 
JOHN F. COGAN, JR., Chairman and President 
DAVID D. TRIPPLE, Executive Vice President 
ROBERT W. BENSON, Vice President 
WILLIAM H. KEOUGH, Treasurer 
JOSEPH P. BARRI, Secretary 

TRUSTEES 
JOHN F. COGAN, JR. 
RICHARD H. EGDAHL, M.D. 
MARGARET B. W. GRAHAM 
JOHN W. KENDRICK 
MARGUERITE A. PIRET 
DAVID D. TRIPPLE 
STEPHEN K. WEST 
JOHN WINTHROP 

INVESTMENT ADVISER 
PIONEERING MANAGEMENT 
CORPORATION 

PRINCIPAL UNDERWRITER 
PIONEER FUNDS 
DISTRIBUTOR, INC. 

CUSTODIAN 
BROWN BROTHERS HARRIMAN & CO. 

INDEPENDENT PUBLIC 
ACCOUNTANTS 
ARTHUR ANDERSEN LLP 

LEGAL COUNSEL 
HALE AND DORR 

SHAREHOLDER SERVICES AND TRANSFER AGENT 
PIONEERING SERVICES CORPORATION 
60 State Street 
Boston, Massachusetts 02109 

 ----------------------------------------------------------------------------- 
Please call Pioneer for information on: 
Existing accounts, new accounts, 
prospectuses, applications, 
and service forms 1-800-225-6292 
Fund yields and prices 1-800-225-4321 
Toll-free fax 1-800-225-4240 
Retirement plans 1-800-622-0176 
Telecommunications Device for the Deaf 
(TDD) 1-800-225-1997 
 ----------------------------------------------------------------------------- 

When distributed to persons who are not shareowners of the Fund, this report 
must be accompanied by an official prospectus, which discusses the 
objectives, policies and other information about the Fund. 

1195-2821 
(C)Pioneer Funds Distributor, Inc. 

[Pioneer Logo] 

Pioneer 
Three 

ANNUAL REPORT 
SEPTEMBER 30, 1995 



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