PIONEER THREE
N-30B-2, 1995-05-25
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 Dear Fellow Shareowners, 
    
Pioneer Three ended the first six months of its 13th fiscal year on March 31, 
1995. During this time, the market for smaller-capitalization stocks generally 
improved, particularly moving into the first quarter of 1995. Pioneer Three 
also achieved stronger results as the period progressed, and the Fund provided 
shareowners with a positive total return for the semiannual period. 

Your Fund's Performance 

   For the six months ended March 31, 1995, we report the following results for 
Pioneer Three: 

   
    * Shareowners received a dividend of $0.12 per share, and a capital gains 
distribution of $1.15, both paid in December 1994. 
    
   
    * Net asset value per share stood at $19.09 on March 31, 1995, versus 
$19.92 on September 30, 1994, in part reflecting the payment of distributions. 
    
   
    * The Fund's six-month total return was 2.74% based on net asset value, and 
-3.19% based on maximum public offering price. Total return represents the 
change in share price and assumes the reinvestment of all distributions at net 
asset value. The performance figures below reflect your Fund's longer-term 
results. 
    
<TABLE>
<CAPTION>
   
                 Average Annual Total Returns 
                    (as of March 31, 1995) 
                              Net Asset    Public Offering 
Period                          Value           Price* 
<S>                             <C>             <C>
Life-of-Fund (11/19/82)         12.90%          12.36% 
10 Years                        11.55           10.90 
5 Years                         10.91            9.60 
1 Year                           2.59           -3.29 
</TABLE>
    
Improving Market Conditions 

The Federal Reserve (the Fed) increased short-term interest rates twice during 
the period, bringing the federal funds rate to a three-year high of 6%. By 
raising rates, the Fed hoped to keep both the economy and inflation under 
control. Recent economic indicators are signaling some success on the Fed's 
part; home sales, construction costs and consumer spending are just a few 
indicators that have declined in recent months, suggesting a slower-paced 
economy. 
   
Investors returned to the smaller-company market at the end of 1994, as they 
gained confidence in the economy's direction and became less fearful of 
additional interest rate increases. Pioneer Three benefited from these improved 
conditions, as evidenced by its stronger results. While the Fund's total return 
for the final three months of 1994 was -3.02%, its total return for the first 
quarter of 1995 was 5.94%. However, large-capitalization stocks continued to 
outperform smaller-capitalization investments for much of the period; their 
name recognition and ease of trading apparently appealed to many investors. In 
fact, the Dow Jones Industrial Average (the Dow) of 30 large-capitalization 
stocks reached an historic level of 4000 in February, and continued to move up, 
closing the period at 4157.68. For the six months ended March 31, 1995, the Dow 
gained 9.69%. 
    

How Pioneer Managed Your Investment 

   
Pioneer Three pursues long-term capital growth and income by investing in 
companies we think demonstrate value in terms of strong balance sheets and 
income statements, high-quality management and low stock prices in relation to 
assets and earning power. As of March 31, 1995, Pioneer Three's portfolio held 
132 stocks from a wide range of companies and sectors. The following chart 
shows the Fund's sector distribution at the close of the semiannual period. 
    
   
*Reflects deduction of the maximum 5.75% sales charge and assumes reinvestment 
of all distributions at net asset value. 
Past performance does not guarantee future results. Return and share price 
fluctuate, and your shares, when redeemed, may be worth more or less than their 
original cost. 
    

                                        1 
<PAGE> 
Sector Distribution 
(as of March 31, 1995) 
<TABLE>
<CAPTION>
<S>                                  <C>
Capital Goods                          16% 
Consumer Durables                       6% 
Consumer Non-Durables                  18% 
Financial                              11% 
Services                               15% 
Technology                              9% 
Basic Industries                       10% 
Energy                                  6% 
Other                                   9% 
</TABLE>

   
Your management continues to find opportunities in the healthcare sector. One 
of the Fund's largest holdings, SciMed Life, was recently acquired by another 
healthcare company, Boston Scientific. The acquisition pushed up the price of 
SciMed Life, generating a sizable increase in the value of the Fund's original 
investment. We continue to hold Boston Scientific, believing it to be a good 
value with attractive growth prospects. We also augmented the portfolio's 
position in other healthcare companies, particularly those providing 
much-needed services to elderly patients. These companies include Health 
Systems, Medisense and Sun Health Care. 
    

   
We are gradually reducing Pioneer Three's exposure to consumer sectors, both 
non-durables (due to continued stagnant retail sales) and durables (because of 
slowing economic growth). On the other side of the coin, we modestly increased 
your Fund's exposure to companies in the technology and energy areas. Diamond 
Shamrock, a refinery, was a recent addition to the portfolio. Because of 1994's 
abnormal weather patterns (e.g., an unusually warm winter and cooler- 
than-normal summer), demand for energy declined, causing many energy companies 
to suffer. The recent lower demand has allowed your management to buy some 
bargains we think should perform well over the long run. 
    

   
Over the past six months, we sold a number of stocks that either had become 
overvalued or less attractive due to a change in company characteristics. These 
stocks were: Chesapeake Corp., GranCare, Inc., Thomas Industries, Inc., 
Petrolite Corp., CPI Corp., American Maize-Products Co., Waverly, Inc., Vallen 
Corp., Coherent, Inc., and Dravo Corp. Clubcar, another portfolio holding, was 
taken over by Clark Equipment in a cash acquisition that generated a solid 
profit for the Fund. 
    

Looking Ahead 

   
The two increases in short-term interest rates over the past six months show 
the Fed's continued determination to control inflation. Of course, we intend to 
keep a careful eye on interest rate movements, particularly given the 
uncertainty of additional increases over the near term. We also will look for 
signs of other events that could have an impact on the stock market, such as 
the weakening dollar and conditions overseas. 
    

   
Your management will monitor and adjust the Fund's portfolio to maintain a wide 
selection of well-valued stocks we think are solid investments for the Fund. We 
remain confident that your Fund's diversified portfolio of small- and 
medium-sized companies, and our value approach to investing, will lead to 
continued strong long-term results. 
    

   
Please refer to the following pages for the audited list of the Fund's 
portfolio holdings as of March 31, 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. 
    

   
Respectfully, 
[signature of John F. Cogan, Jr.] 
John F. Cogan, Jr. 
Chairman and President, 
Pioneer Three 
    

May 3, 1995 

                                        2 
<PAGE> 
<TABLE>
<CAPTION>
 Shares                                                            Value 
<S>         <C>                                               <C>
                          COMMON STOCKS--96.0% 
                         BASIC INDUSTRIES--9.5% 
                            Chemicals--3.4% 
274,000      Cambrex Corp.+                                     $  8,357,000 
231,400      Chemed Corp.                                          7,231,250 
331,850      The Dexter Corp.                                      7,259,219 
200,000      The Geon Co.                                          5,600,000 
164,700      Vigoro Corp.                                          6,093,900 
                                                                $ 34,541,369 
                         Forest Products--1.3% 
299,135      Potlatch Corp.                                     $ 12,601,062 
                           Iron & Steel--2.3% 
721,000      Chaparral Steel Co.                                $  6,579,125 
151,700      Harsco Corp.                                          6,674,800 
935,500      Intermet Corp.                                        7,600,937 
484,500      NS Group, Inc.*                                       1,938,000 
                                                                $ 22,792,862 
                          Paper Products--0.9% 
209,750      Pentair, Inc.                                      $  8,861,937 
                        Pollution & Waste--1.1% 
873,800      Applied Bioscience International, Inc.*            $  4,696,675 
283,000      Roy F. Weston, Inc. (Class A)*                        1,255,812 
290,300      Zurn Industries, Inc.                                 5,334,262 
                                                                $ 11,286,749 
                         Precious Metals--0.5% 
464,700      Hecla Mining Co.*                                  $  5,344,050 
                Total Basic Industries                          $ 95,428,029 
                          CAPITAL GOODS--15.7% 
                    Construction & Engineering--3.9% 
505,100      Granite Construction, Inc.                         $  9,281,212 
148,350      Hughes Supply, Inc.                                   3,022,631 
467,975      Ply-Gem Industries, Inc.                              8,365,053 
633,750      RPM, Inc. Ohio                                       12,595,781 
387,700      The Ryland Group, Inc.                                5,573,187 
                                                                $ 38,837,864 
                         Producer Goods--11.8% 
486,400      Castech Aluminum Group, Inc.*                      $  7,235,200 
416,950      CLARCOR, Inc.                                         8,808,069 
445,000      DT Industries, Inc.                                   5,340,000 
463,000      The Duriron Co., Inc.                                 9,491,500 
240,500      Farrel Corp.                                          1,172,437 
558,480      Federal Signal Corp.                                 12,077,130 
234,600      Ferrofluidics Corp.*                                  1,671,525 
248,100      Finning Ltd.                                          3,449,027 
425,000      Greenfield Industries                                12,006,250 
241,800      Hawker Siddeley Canada, Inc.                          2,671,918 
546,400      Kennametal, Inc.                                     14,684,500 
257,251      Keystone International, Inc.                          5,563,053 
206,400      Kimball International, Inc. (Class B)                 5,314,800 
898,000      Regal-Beloit Corporation                             14,031,250 
465,800      Shelby Williams Industries, Inc.+                     4,425,100 
477,400      Watts Industries, Inc. (Class A)                     10,502,800 
                                                                $118,444,559 
                Total Capital Goods                             $157,282,423 

                                        3 
<PAGE> 
                        CONSUMER DURABLES--5.9% 
                        Consumer Durables--1.2% 
200,500      Leggett & Platt, Inc.                              $  8,421,000 
91,600       National Presto Industries, Inc.                      3,721,250 
                                                                $ 12,142,250 
                          Motor Vehicles--4.7% 
314,400      Arvin Industries, Inc.                             $  6,681,000 
512,000      Hi-Lo Automotive, Inc.*                               4,352,000 
242,800      Modine Manufacturing Co.                              8,133,800 
844,012      Simpson Industries, Inc.                              8,334,623 
212,300      SPX Corp.                                             3,078,350 
413,400      Standard Motor Products, Inc.                         8,319,675 
800,000      TBC Corp.*                                            8,100,000 
                                                                $ 46,999,448 
                Total Consumer Durables                         $ 59,141,698 
                      CONSUMER NON-DURABLES--18.2% 
                        Agriculture & Food--0.9% 
258,950      Flowers Industries, Inc.                           $  4,661,100 
114,734      Golden Poultry Co., Inc.                                745,771 
195,500      Thorn Apple Valley, Inc.                              3,763,375 
                                                                $  9,170,246 
                        Consumer Luxuries--1.1% 
406,100      Huffy Corp.                                        $  6,142,262 
240,800      Outboard Marine Corp.                                 5,056,800 
                                                                $ 11,199,062 
                           Retail Food--0.8% 
417,800      Ruddick Corp.                                      $  8,356,000 
                         Retail Non-Food--10.3% 
501,000      Arbor Drugs, Inc.                                  $ 11,898,750 
503,100      Caldor Corp.*                                        10,753,762 
390,000      Catherines Stores*+                                   3,412,500 
183,800      Cato Corp. (Class A)                                  1,171,725 
734,900      CML Group, Inc.                                       6,522,238 
742,300      Consolidated Stores Corp.*                           14,938,788 
700,000      Designs, Inc.*                                        6,300,000 
513,000      Family Dollar Stores, Inc.                            6,540,750 
166,000      Fingerhut Companies, Inc.                             1,971,250 
315,000      Fred Meyer, Inc.*                                     9,331,875 
220,700      Hancock Fabrics, Inc.                                 2,234,588 
359,700      Nine West Group, Inc.*                               10,611,150 
787,109      Pier 1 Imports, Inc.                                  7,280,758 
542,800      Russ Berrie and Company, Inc.                         7,802,750 
455,000      Vans, Inc.*                                           2,331,875 
                                                                $103,102,759 
                         Textiles/Clothes--5.1% 
350,000      Angelica Corp.                                     $  9,625,000 
550,000      Cone Mills Corp.*                                     6,737,500 
400,000      Crown Crafts, Inc.                                    6,800,000 
448,400      Guilford Mills, Inc.                                  9,640,600 
550,000      Paragon Trade Brands, Inc.*                           7,837,500 
368,212      Unifi, Inc.                                           9,941,724 
                                                                $ 50,582,324 
                Total Consumer Non-Durables                     $182,410,391 

                                        4 
<PAGE> 
                              ENERGY--5.6% 
                           Oil Services--2.1% 
558,300      Enterra Corp.*                                     $  9,560,888 
450,000      Matrix Service Co.*                                   1,603,125 
788,300      Oceaneering International, Inc.*                      7,784,463 
326,500      Stolt Comex Seaway, S.A.*                             2,285,500 
                                                                $ 21,233,976 
                       Oil & Gas Extraction--3.5% 
171,900      Diamond Shamrock, Inc.                             $  4,533,863 
606,100      Home Oil Co., Ltd.*                                   6,157,357 
502,700      Plains Resources, Inc.*                               3,895,925 
244,000      Seagull Energy Corp.*                                 4,819,000 
112,600      Southwestern Energy Co.                               1,689,000 
478,100      Vintage Petroleum, Inc.                               9,502,238 
1,096,400    Wainoco Oil Corp.*                                    4,385,600 
                                                                $ 34,982,983 
                Total Energy                                    $ 56,216,959 
                            FINANCIAL--10.8% 
                         Commercial Bank--3.8% 
442,500      Magna Group, Inc.                                  $  8,850,000 
309,200      Meridian Bancorp, Inc.                                9,469,250 
405,525      Old Kent Financial Corp.                             12,774,038 
128,610      SunTrust Banks, Inc.                                  6,880,635 
                                                                $ 37,973,923 
                        Insurance-General--1.4% 
500,000      American Bankers Insurance Group, Inc.             $ 14,312,500 
                        Non-Life Insurance--4.7% 
936,900      Allmerica Property & Casualty Companies, Inc.      $ 17,918,213 
530,000      Guaranty National Corp.                               8,215,000 
483,000      Selective Insurance Group, Inc.                      13,886,250 
563,712      Willis Corroon Group Plc. (A.D.R.)                    6,412,224 
                                                                $ 46,431,687 
                          Savings & Loan--0.9% 
355,000      Albank Financial Corp.                             $  8,875,000 
                Total Financial                                 $107,593,110 
                            SERVICES--15.0% 
                 Health Services & Personal Care--9.7% 
370,900      Allied Healthcare Products+                        $  5,702,588 
421,100      American Healthcorp, Inc.*+                           3,158,250 
558,560      Bergen Brunswig Corp. (Class A)                      14,941,480 
507,300      BioWhittaker, Inc.*                                   4,058,400 
1,073,121    Boston Scientific Corporation*                       26,425,605 
384,199      Community Health Systems, Inc.*                      12,102,269 
205,000      Healthdyne, Inc.*                                     2,101,250 
276,000      Integrated Health Services, Inc.                     10,453,500 
40,000       Lincare Holdings, Inc.*                               1,185,000 
450,000      MediSense, Inc.*                                      8,887,500 
313,800      Sun Healthcare Group, Inc.*                           8,001,900 
                                                                $ 97,017,742 
                         Pharmaceuticals--1.3% 
925,800      Medeva Plc. (A.D.R.)                               $ 12,382,575 
                            Publishing--0.2% 
50,000       Houghton Mifflin Company                           $  2,325,000 

                                        5 
<PAGE> 
                             Services--3.8% 
77,900       Cadmus Communications Corp.                        $  1,460,625 
518,600      The Interpublic Group of Companies, Inc.             19,382,675 
581,850      National Data Corp.                                  10,109,644 
385,500      New England Business Service, Inc.                    7,083,562 
                                                                $ 38,036,506 
                Total Services                                  $149,761,823 
                            TECHNOLOGY--9.4% 
                        Business Machines--2.6% 
850,000      Data General Corp.*                                $  6,268,750 
521,000      National Computer Systems, Inc.                       8,726,750 
1,217,100    Smith Corona Corp.                                    3,042,750 
250,000      Stratus Computer, Inc.*                               7,812,500 
                                                                $ 25,850,750 
                        Computer Software--1.2% 
450,000      BancTec, Inc.*                                     $  6,750,000 
350,000      Banyan Systems, Inc.*                                 5,293,750 
                                                                $ 12,043,750 
                           Electronics--5.6% 
404,010      Baldor Electric Co.                                $ 11,211,278 
218,600      Belden, Inc.                                          4,809,200 
182,500      HADCO Corp.*                                          2,201,406 
345,750      Joslyn Corp.                                          8,470,875 
285,000      Kuhlman Corp.                                         3,313,125 
249,100      Marshall Industries*                                  6,476,600 
690,000      Micro Focus Group Plc. (A.D.R.)*                      7,805,625 
428,500      Structural Dynamics Research Corp.*                   3,749,375 
302,100      Whittaker Corp.*                                      5,815,425 
318,900      Zenith Electronics Corp.*                             2,471,475 
                                                                $ 56,324,384 
                Total Technology                                $ 94,218,884 
                          TRANSPORTATION--2.8% 
                          Air Transport--0.8% 
356,900      Airborne Freight Corp.                             $  7,450,288 
                         Ships & Shipping--1.1% 
507,900      American President Companies, Ltd.                 $ 11,110,312 
                    Truck Transport & Storage--0.9% 
855,000      Arkansas Best Corp.                                $  9,084,375 
                Total Transportation                            $ 27,644,975 
                            UTILITIES--3.1% 
                           Gas Utility--2.1% 
591,300      KN Energy, Inc.                                    $ 14,191,200 
   
274,300      Peoples Energy Corp.                                  6,857,500 
                                                                $ 21,048,700 
                          Utility/Other--1.0% 
373,000      Eastern Enterprises                                $ 10,350,750 
                Total Utilities                                 $ 31,399,450 
                TOTAL COMMON STOCKS (Cost $748,921,907) (a)     $961,097,742 
</TABLE>
    
                                        6 
<PAGE> 
<TABLE>
<CAPTION>
Principal 
 Amount                                                                          Value 
                    TEMPORARY CASH INVESTMENTS--4.0% 
<S>        <C>                                                             <C>
   
$ 9,412,000  Commercial Credit Corp., Commercial Paper, 5.93% due 4/3/95     $    9,418,208 
 11,193,000  Chevron Oil Finance, Commercial Paper, 5.96% due 4/4/95             11,198,555 
  9,356,000  Associates Corp. of America, Commercial Paper, 5.95% due 4/5/95      9,359,096 
 10,360,000  Norwest Financial Inc., Commercial Paper, 6.00% due 4/6/95          10,361,728 
               TOTAL TEMPORARY CASH INVESTMENTS (Cost $40,321,000)           $   40,337,587 
               TOTAL INVESTMENT IN SECURITIES (Cost $789,242,907)--100%      $1,001,435,329 
</TABLE>
    
   
* Represents non-income producing security 
+ Investments held representing 5% or more of the outstanding voting stock of 
such company (Note 5) 
(a) At March 31, 1995, the net unrealized appreciation on investments based on 
cost for federal income tax purposes of $748,921,907 was as follows: 
    

<TABLE>
<CAPTION>
<S>                                                                          <C>
Aggregrate gross unrealized appreciation for all investments in which 
  there is an excess of value over tax cost                                    $298,972,867 
Aggregrate gross unrealized depreciation for all investments in which 
  there is an excess of tax cost over value                                     (86,797,032) 
Net unrealized appreciation                                                    $212,175,835 
</TABLE>

   
Purchases and sales of investments securities (excluding temporary cash 
investments) for the six months ended March 31, 1995, aggregated $89,879,470 
and $119,045,703, respectively. 
    


                                        7 
<PAGE> 
                          BALANCE SHEET--MARCH 31, 1995 
                 (Dollars in Thousands Except Per Share Amounts) 

<TABLE>
<CAPTION>
<S>                                                                         <C>
   
 ASSETS: 
 Investment in securities, at value (including temporary cash 
  investments of $40,338) (cost $789,243; see Schedule of Investments 
  and Notes 1 and 5)                                                          $1,001,435 
 Cash                                                                              1,823 
 Receivables-- 
  Investment securities sold                                                       3,717 
  Dividends and interest                                                           1,213 
  Trust shares sold                                                                1,436 
 Other                                                                                31 
   Total assets                                                               $1,009,655 
LIABILITIES: 
 Payables-- 
  Investment securities purchased                                             $      999 
  Trust shares repurchased                                                           917 
 Accrued expenses-- 
  Management fees (Note 2)                                                            51 
  Other (Notes 2, 3 and 4)                                                           731 
   Total liabilities                                                          $    2,698 
NET ASSETS: 
 Trust shares (unlimited number of shares authorized), amount paid in on 
  52,753,223 shares outstanding (Note 1)                                      $  760,500 
 Accumulated undistributed net investment income                                   3,332 
 Accumulated undistributed net realized gain on investments                       30,949 
 Net unrealized gain on investments                                              212,176 
  Total net assets (equivalent to $19.09 per share based on 52,753,223 
  trust shares outstanding)                                                   $1,006,957 
</TABLE>
    
                                        8 
<PAGE> 
                            STATEMENT OF OPERATIONS 
                     For the Six Months Ended March 31, 1995 
                             (Dollars in Thousands) 

<TABLE>
<CAPTION>
   
<S>                                                        <C>        <C>
 INVESTMENT INCOME (Note 1): 
 Dividends                                                 $9,411 
 Interest                                                     887 
  Total investment income                                              $ 10,298 
EXPENSES: 
 Management fees (Note 2)                                  $2,273 
 Transfer fees (Note 3)                                       877 
 Distribution fees (Note 4)                                   783 
 Accounting (Note 2)                                           54 
 Custodian fees                                                46 
 Professional fees                                             38 
 Registration fees                                             27 
 Fees and expenses of nonaffiliated trustees                   26 
 Printing                                                      22 
 Miscellaneous                                                 26 
  Total expenses                                                          4,172 
   Net investment income                                               $  6,126 
REALIZED AND UNREALIZED GAIN (LOSS) ON INVESTMENTS: 
 Net realized gain on investments (Note 1)                             $ 33,254 
 Decrease in net unrealized gain on investments                         (12,995) 
  Net gain on investments                                              $ 20,259 
   Net increase in net assets resulting from 
    operations                                                         $ 26,385 
</TABLE>
    
                                        9 
<PAGE> 
                                        STATEMENTS OF CHANGES IN NET ASSETS 
<TABLE>
<CAPTION>
                         For the Six Months Ended March 31, 1995 and for the Year Ended September 30, 1994 
                                          (Dollars in Thousands Except Per Share Amounts) 

   
                                                                                                Six Months 
                                                                                                   Ended         Year Ended 
                                                                                                 Mar. 31,         Sept. 30 
                                                                                                   1995             1994 
<S>                                                            <C>              <C>             <C>              <C>
FROM OPERATIONS: 
 Net investment income                                                                          $    6,126       $   12,317 
 Net realized gain on investments                                                                   33,254           61,071 
 Increase (decrease) in net unrealized gain on investments                                         (12,995)         (46,767) 
  Net increase in net assets resulting from operations                                          $   26,385       $   26,621 
DISTRIBUTIONS TO SHAREHOLDERS FROM: 
 Net investment income ($0.12 and $0.25 per share, respectively)                                $   (6,045)      $  (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                           $  (63,704)      $  (85,207) 
FROM TRUST SHARE TRANSACTIONS: 
                                                                         SHARES 
 Net proceeds from sale of shares                               2,701,551        6,605,985      $   50,667       $  134,158 
 Net asset value of shares issued to shareholders in 
  reinvestment of dividends and capital gain 
  distributions                                                 3,483,545        4,067,109          61,171           81,921 
 Cost of shares repurchased                                    (4,502,954)      (7,844,246)        (84,795)        (159,319) 
  Increase in net assets resulting from trust share 
  transactions                                                  1,682,142        2,828,848      $   27,043       $   56,760 
  Net increase (decrease) in net assets                                                         $  (10,276)      $   (1,826) 
NET ASSETS: 
 Beginning of period                                                                             1,017,233        1,019,059 
 End of period (including accumulated undistributed net investment income of $3,332 and 
  $3,251, respectively)                                                                         $1,006,957       $1,017,233 
</TABLE>
    


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

<TABLE>
<CAPTION>
                       Six 
                      Months 
                      Ended 
                     March 31,                                       For the Year Ended September 30, 
                       1995       1994       1993       1992     1991      1990      1989     1988      1987     1986       1985 
   
<S>                   <C>        <C>        <C>        <C>      <C>      <C>        <C>      <C>       <C>      <C>        <C>
Net asset value, 
  beginning of 
  period              $19.92     $21.12     $18.03     $16.16   $12.96   $ 17.80    $15.09   $18.52    $16.01   $13.98     $13.19 
   
Income from 
  investment 
  operations-- 
 Net investment 
  income              $ 0.12     $ 0.24     $ 0.28     $ 0.33   $ 0.41   $  0.41    $ 0.42   $ 0.30    $ 0.28   $ 0.34     $ 0.34 
   
 Net realized 
  and unrealized 
  gain (loss) on 
  investments           0.32       0.32       3.72       2.04     3.94     (3.56)     3.33    (1.91)     3.76     2.41       0.97 
   
Total increase 
  (decrease) from 
  investment 
  operations          $ 0.44     $ 0.56     $ 4.00     $ 2.37   $ 4.35   $ (3.15)   $ 3.75   $(1.61)   $ 4.04   $ 2.75     $ 1.31 
   
Distribution to 
  shareholders 
  from-- 
 Net investment 
  income               (0.12)     (0.25)     (0.29)     (0.35)   (0.41)    (0.46)    (0.36)   (0.41)    (0.36)   (0.36)     (0.34) 
 Net realized 
  capital gains        (1.15)     (1.51)     (0.62)     (0.15)   (0.74)    (1.23)    (0.68)   (1.41)    (1.17)   (0.36)     (0.18) 
Net increase 
  (decrease) in 
  net asset value     $(0.83)    $(1.20)    $ 3.09     $ 1.87   $ 3.20   $ (4.84)   $ 2.71   $(3.43)   $ 2.51   $ 2.03     $ 0.79 
Net asset value, 
  end of period       $19.09     $19.92     $21.12     $18.03   $16.16   $ 12.96    $17.80   $15.09    $18.52   $16.01     $13.98 
   
Total return*           2.74%      2.62%     22.82%     15.05%   35.80%   (19.39%)   26.32%   (6.00%)   27.50%   20.40%     10.21% 
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%      0.75% 
Ratio of net 
  investment 
  income to 
  average net 
  assets                1.25%**    1.19%      1.43%      1.85%    2.72%     2.58%     2.56%    2.15%     1.74%    2.41%      3.08% 
Porfolio 
  turnover rate           19%**      15%        18%        12%       5%       14%       16%      12%       23%      24%        11% 
Net assets end 
  of  period (in 
  thousands)       $1,006,957 $1,017,233 $1,019,059  $779,631 $692,344  $562,343  $752,135 $616,953  $734,300  $543,173  $369,080 
</TABLE>
    
* Assumes initial investment at net asset value at the beginning of each 
period, reinvestment of all distributions, the complete redemption of the 
investment at the net asset value at the end of each period and no sales 
charges. Total return would be reduced if sales charges were taken into 
account. 

   
** Annualized 
    


                                       11 
<PAGE> 
NOTES TO FINANCIAL STATEMENTS-March 31, 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 
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. Investment Securities--Security transactions are recorded on the date the 
securities are purchased or sold. Investments in 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. Temporary cash investments are valued at 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 from 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 first to 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 provisions are required. 

   
  The characterization of distributions to shareholders for financial reporting 
purposes is determined in accordance with income tax rules. Therefore, the 
source of a 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 capital, depending on the type of 
book/tax differences that may exist. 
    

  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 a wholly owned subsidiary of The Pioneer Group, Inc. (PGI). 
PFD earned $102,000 in underwriting commissions on the sale of trust shares of 
the Fund during the six months ended March 31, 1995. Dividends and 
distributions to shareholders are recorded as of the ex-dividend date. 

   
2. Pioneering Management Corporation (PMC) is 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 such assets between 
$250,000,000 and $300,000,000, and 0.45% of such assets in excess of 
$300,000,000. 
    
   
 In addition, under the management agreement, certain services and costs 
including accounting, regulatory reporting and insurance premiums are paid by 
the Fund. Included in Accrued expenses--Other is approximately $12,000 in 
accounting fees payable to PMC at March 31, 1995. 
    

   
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 
$253,000 in transfer fees payable to PSC at March 31, 1995. 
    

   
4. The Fund has adopted a Plan of Distribution (the Plan) in accordance with 
Rule 12b-1 under the Investment Company Act of 1940. The Plan generally 
provides that the Fund will reimburse PFD for PFD's actual expenditures to 
finance activities intended to result in the sale of the Fund's shares or to 
provide services to the Fund's shareholders. Expenditures to the fund pursuant 
to the Plan may 
    
                                       12 
<PAGE> 
   
not exceed 0.25% of the Fund's average annual net assets. The Plan provides for 
service fees to be paid at a rate of 0.15% per annum 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 $378,000 in distribution fees payable to PFD at March 31, 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 March 31, 1995. 
    


<TABLE>
<CAPTION>
                                                (Dollar amounts in thousands) 
   
                                        Purchases     Sales     Dividend 
             Affiliates                   Cost        Cost       Income       Value 
<S>                                        <C>         <C>        <C>         <C>
Allied Healthcare Products                 $--         $--        $ 52       $ 5,703 
American Healthcorp, Inc.*                  --          --          --         3,158 
Cambrex Corp.                               --          --          27         8,357 
Catherines Stores*                          --          --          --         3,413 
Shelby Williams Industries, Inc.           --           27          65         4,425 
TOTAL                                      $--         $27        $144       $25,056 
</TABLE>
    
   
*Represents non-income producing security 
    


                                       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 (a 
Massachusetts business trust) including the schedule of investments, as of 
March 31, 1995, and the related statement of operations, the statements of 
changes in net assets and the financial highlights for the periods 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 
March 31, 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 March 31, 1995, the results of its operations, the changes 
in its net assets and the financial highlights for the periods presented, in 
conformity with generally accepted accounting principles. 
                                                             ARTHUR ANDERSEN LLP
    
   
Boston, Massachusetts 
April 21, 1995 
    

                                       14 
<PAGE> 
   
                            INTENTIONALLY LEFT BLANK 
    


                                       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, sales charges, and other information about the Fund. 
    
0595-2435 
(c) Pioneer Funds Distributor, Inc. 

[Pioneer Logo] 
Pioneer 
Three 

SEMIANNUAL REPORT 
MARCH 31, 1995 

                                       16


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