SENTRY INVESTMENT MANAGEMENT INC
13F-HR, 1999-08-04
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                    FORM 13F

                               FORM 13F COVER PAGE

Report for the Calendar Year or Quarter Ended:  June 30, 1999

Check here if Amendment ( ); Amendment Number:
                                              -----------------
  This Amendment (Check only one.):                ( )is a restatement.
                                                   ( )adds new holdings entires.

Institutional Investment Manager Filing this Report:

Name:         SENTRY INVESTMENT MANAGEMENT, INC.
Address:      1800 North Point Drive
              Stevens Point, WI  54481

Form 13F File Number:  28-870

The institutional investment manager filing this report and the person by whom
it is signed hereby represent that the person signing the report is authorized
to submit it, that all information contained herein is true, correct and
complete, and that it is understood that all required items, statements,
schedules, lists, and tables, are considered integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:

Name:         Keith E. Ringberg
Title:        Director - Equities Management
Phone:        715-346-6825

Signature, Place, and Date of Signing:

Keith E. Ringberg           Stevens Point, Wisconsin                7/28/99
- -----------------           ------------------------                -------
  (Signature)                    (City, State)                       (Date)

Report Type (Check only one.):

(X)           13F HOLDINGS REPORT. (Check here if all holdings of this reporting
              manager are reported in this report.)

( )           13F NOTICE. (Check here if no holdings reported are in this
              report, and all holdings reported by other reporting manager(s).)

( )           13F COMBINATION REPORT. (Check here if a portion of the holdings
              for this reporting manager are reported in this report and a
              portion are reported by other reporting manager(s).)

<PAGE>   2
                              FORM 13F SUMMARY PAGE

Report Summary:


Number of Other Included Managers:                                         0
                                                    -------------------------

Form 13F Information Table Entry Total:                                  139
                                                    -------------------------

Form 13F Information Table Value Total:                              882,369
                                                    -------------------------
                                                          (thousands)


List of Other Included Managers:



Provide a numbered list of the name(s) and Form 13F file number(s) of all
institutional investment managers with respect to which this report is filed,
other than the manager filing this report.


                                      NONE
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<TABLE>
<CAPTION>

                                                      FORM 13F INFORMATION TABLE

              COLUMN 1       COLUMN 2     COLUMN 3    COLUMN 4        COLUMN 5         COLUMN 6     COLUMN 7            COLUMN 8
              --------       --------     --------    --------        --------         --------     --------            --------

                             TITLE OF               VALUE      SHRS OR    SH/   PUT/   INVESTMENT       OTHER  VOTING AUTHORITY
NAME OF ISSUER                  CLASS     CUSIP   (x $1000)    PRN AMT    PRN   CALL   DISCRETION    MANAGERS  SOLE   SHARED    NONE
- --------------                  -----     -----   ---------    -------    ---   ----   ----------    --------  ----   ------    ----

<S>                            <C>      <C>        <C>       <C>        <C>    <C>   <C>          <C>          <C>    <C>       <C>
ABBOTT LABORATORIES            COMMON    002824100    9,373     206,000   SHRS          SOLE         NONE     206,000
ALPHA TECHNOLOGIES GROUP       COMMON    020781100      219      58,334   SHRS          SOLE         NONE      58,334
AMSOUTH BANCORPORATION         COMMON    032165102      913      39,375   SHRS          SOLE         NONE      39,375
ANALYSTS INTL CORP.            COMMON    032681108    7,870     547,500   SHRS          SOLE         NONE     547,500
ANESTA CORP.                   COMMON    034603100    3,168     155,000   SHRS          SOLE         NONE     155,000
ANHEUSER-BUSCH                 COMMON    035229103    7,094     100,000   SHRS          SOLE         NONE     100,000
APPLIED POWER CL A             COMMON    038225108   18,532     678,500   SHRS          SOLE         NONE     678,500
ASHLAND INC                    COMMON    044204105    2,006      50,000   SHRS          SOLE         NONE      50,000
ASSOCIATED BANC-CORP.          COMMON    045487105   37,086     893,646   SHRS          SOLE         NONE     893,646
BANK ONE CORP                  COMMON    06423A103    7,262     121,930   SHRS          SOLE         NONE     121,930
BIOMET INC.                    COMMON    090613100    1,193      30,000   SHRS          SOLE         NONE      30,000
BLACK & DECKER CORP            COMMON    091797100   10,984     174,000   SHRS          SOLE         NONE     174,000
BLOCK (H&R) INC.               COMMON    093671105    5,250     105,000   SHRS          SOLE         NONE     105,000
BRIO TECHNOLOGY INC            COMMON    109704106      184       9,183   SHRS          SOLE         NONE       9,183
BRISTOL-MYERS SQUIBB           COMMON    110122108   24,343     345,600   SHRS          SOLE         NONE     345,600
BUTLER MANUFACTURING CO.       COMMON    123655102    2,933     105,000   SHRS          SOLE         NONE     105,000
CABOT OIL & GAS CORP.          COMMON    127097103    3,980     213,700   SHRS          SOLE         NONE     213,700
CARLISLE COMPANIES INC.        COMMON    142339100      963      20,000   SHRS          SOLE         NONE      20,000
CARNIVAL CORP                  COMMON    143658102    3,638      75,000   SHRS          SOLE         NONE      75,000
CENTRAL PARKING CORP.          COMMON    154785109    1,887      55,100   SHRS          SOLE         NONE      55,100
CLAIRE'S STORES INC            COMMON    179584107    2,819     110,000   SHRS          SOLE         NONE     110,000
CNB BANCSHARES INC.            COMMON    126126101    4,560      80,000   SHRS          SOLE         NONE      80,000
COHO ENERGY INC.               COMMON    192481109      301     578,000   SHRS          SOLE         NONE     578,000
COINSTAR INC.                  COMMON    19259P300    7,028     245,000   SHRS          SOLE         NONE     245,000
COMMUNITY FIRST BANKSHRS       COMMON    203902101    4,658     195,100   SHRS          SOLE         NONE     195,100
CONCENTRIC NETWORK CORP        COMMON    20589R107      164       4,133   SHRS          SOLE         NONE       4,133
CONSOLIDATED PRODUCTS INC.     COMMON    209798107    5,217     289,843   SHRS          SOLE         NONE     289,843
CONSOLIDATED STORES CORP.      COMMON    210149100    3,410     126,300   SHRS          SOLE         NONE     126,300
COOKER RESTAURANT CORP.        COMMON    216284208      398      71,600   SHRS          SOLE         NONE      71,600
CYTYC CORP.                    COMMON    232946103    6,094     312,500   SHRS          SOLE         NONE     312,500
</TABLE>


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<PAGE>   4

<TABLE>
<CAPTION>

                                                      FORM 13F INFORMATION TABLE


<S>                           <C>       <C>          <C>       <C>        <C>   <C>       <C>           <C>     <C>
DATA RESEARCH ASSOCIATES       COMMON    237853106    2,526     243,500   SHRS          SOLE         NONE     243,500
DELUXE CORP.                   COMMON    248019101    6,082     156,200   SHRS          SOLE         NONE     156,200
DIAMETRICS MEDICAL INC.        COMMON    252532106    1,200     200,000   SHRS          SOLE         NONE     200,000
ECLIPSE SURGICAL TECH INC.     COMMON    278849104      168      15,552   SHRS          SOLE         NONE      15,552
ENDOSONICS CORP                COMMON    29264K105    4,672     667,422   SHRS          SOLE         NONE     667,422
ENNIS BUSINESS FORMS INC.      COMMON    293389102    4,122     481,450   SHRS          SOLE         NONE     481,450
EXXON CORP.                    COMMON    302290101    4,628      60,000   SHRS          SOLE         NONE      60,000
FIRSTAR CORP                   COMMON    33763V109   16,052     573,288   SHRS          SOLE         NONE     573,288
FISERV, INC.                   COMMON    337768108   15,081     481,639   SHRS          SOLE         NONE     481,639
FLOW INTERNATIONAL CORP.       COMMON    343468104    1,000      92,500   SHRS          SOLE         NONE      92,500
GENERAL CABLE CORP.            COMMON    369300108    8,585     536,550   SHRS          SOLE         NONE     536,550
GENERAL ELECTRIC CO.           COMMON    369604103   22,227     196,700   SHRS          SOLE         NONE     196,700
GUIDANT CORP.                  COMMON    401698105    1,543      30,000   SHRS          SOLE         NONE      30,000
HANCOCK FABRICS INC.           COMMON    409900107    2,284     522,000   SHRS          SOLE         NONE     522,000
HARLEY-DAVIDSON INC.           COMMON    412822108   34,577     635,900   SHRS          SOLE         NONE     635,900
HEALTH MGMT ASSOCIATES         COMMON    421933102    5,625     500,000   SHRS          SOLE         NONE     500,000
HEALTHCARE RECOVERIES INC.     COMMON    42220K101    2,280     480,000   SHRS          SOLE         NONE     480,000
HOME FEDERAL BANCORP           COMMON    436926109    5,675     200,000   SHRS          SOLE         NONE     200,000
IDX SYSTEMS CORP.              COMMON    449491109    3,610     160,000   SHRS          SOLE         NONE     160,000
IHOP CORP.                     COMMON    449623107   11,069     460,000   SHRS          SOLE         NONE     460,000
INTL BUSINESS MACHINES         COMMON    459200101   39,887     308,600   SHRS          SOLE         NONE     308,600
INVACARE CORP.                 COMMON    461203101    7,758     290,000   SHRS          SOLE         NONE     290,000
ITI TECHNOLOGIES INC.          COMMON    450564109    8,989     397,300   SHRS          SOLE         NONE     397,300
JASON INC.                     COMMON    471171108    4,260     532,500   SHRS          SOLE         NONE     532,500
KEANE INC                      COMMON    486665102    5,349     236,400   SHRS          SOLE         NONE     236,400
KERR-MCGEE CORP.               COMMON    492386107    1,506      30,000   SHRS          SOLE         NONE      30,000
KOALA CORP.                    COMMON    499866101    1,953      73,000   SHRS          SOLE         NONE      73,000
KROGER CO                      COMMON    501044101    6,426     230,000   SHRS          SOLE         NONE     230,000
LANCASTER COLONY CORP.         COMMON    513847103   11,818     342,550   SHRS          SOLE         NONE     342,550
LINCARE HOLDINGS INC.          COMMON    532791100    1,250      50,000   SHRS          SOLE         NONE      50,000
LUMISYS INC.                   COMMON    550274104    1,313     400,000   SHRS          SOLE         NONE     400,000
LUNAR CORP.                    COMMON    550362107    1,025     130,150   SHRS          SOLE         NONE     130,150
MANITOWOC CO INC.              COMMON    563571108   16,153     388,050   SHRS          SOLE         NONE     388,050
MARSHALL & ILSLEY CORP.        COMMON    571834100   32,995     512,547   SHRS          SOLE         NONE     512,547
MCDERMOTT INTL. INC.           COMMON    580037109    4,828     170,900   SHRS          SOLE         NONE     170,900
</TABLE>


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<PAGE>   5

<TABLE>
<CAPTION>

                                                      FORM 13F INFORMATION TABLE

<S>                            <C>      <C>        <C>       <C>        <C>          <C>          <C>        <C>
MCDONALD'S CORP.               COMMON    580135101   16,938     410,000   SHRS          SOLE         NONE     410,000
MEADE INSTRUMENTS CORP         COMMON    583062104    4,313     250,000   SHRS          SOLE         NONE     250,000
MEDITRUST CORP.                COMMON    58501T306      860      65,848   SHRS          SOLE         NONE      65,848
MEDQUIST INC.                  COMMON    584949101    3,938      90,000   SHRS          SOLE         NONE      90,000
MEGABANK FINANCE CORP.         COMMON    58515J104      700      70,000   SHRS          SOLE         NONE      70,000
MEMBERWORKS INC                COMMON    586002107      363      12,505   SHRS          SOLE         NONE      12,505
MERIDIAN DIAGNOSTICS           COMMON    589602101    1,389     195,000   SHRS          SOLE         NONE     195,000
MGIC INVESTMENT CORP WIS       COMMON    552848103    6,808     140,000   SHRS          SOLE         NONE     140,000
MMC NETWORKS INC               COMMON    55308N102      288       6,426   SHRS          SOLE         NONE       6,426
MORTONS RESTAURANT             COMMON    619429103    2,276     119,400   SHRS          SOLE         NONE     119,400
MYLAN LABORATORIES INC         COMMON    628530107   10,865     410,000   SHRS          SOLE         NONE     410,000
NATIONAL CITY BANCORP          COMMON    635312101    1,676      80,300   SHRS          SOLE         NONE      80,300
NATIONAL CITY CORP             COMMON    635405103    2,646      40,400   SHRS          SOLE         NONE      40,400
NCI BUILDING SYSTEMS           COMMON    628852105    5,729     268,000   SHRS          SOLE         NONE     268,000
NORTEL NETWORKS CORP           COMMON    656569100    1,447      16,670   SHRS          SOLE         NONE      16,670
OCEANEERING INTL. INC.         COMMON    675232102    3,870     240,000   SHRS          SOLE         NONE     240,000
O'CHARLEY'S INC.               COMMON    670823103      880      55,000   SHRS          SOLE         NONE      55,000
OFFICE DEPOT INC               COMMON    676220106    7,722     350,000   SHRS          SOLE         NONE     350,000
OMNICARE INC                   COMMON    681904108    6,313     500,000   SHRS          SOLE         NONE     500,000
OSHKOSH TRUCK CORP.            COMMON    688239201   16,628     330,500   SHRS          SOLE         NONE     330,500
OSMONICS INC.                  COMMON    688350107       72       6,600   SHRS          SOLE         NONE       6,600
PAPA JOHN'S INTL. INC.         COMMON    698813102    1,788      40,000   SHRS          SOLE         NONE      40,000
PETROGLYPH ENERGY INC.         COMMON    71649C101      625     250,000   SHRS          SOLE         NONE     250,000
PHILIP MORRIS COS., INC.       COMMON    718154107   30,141     750,000   SHRS          SOLE         NONE     750,000
PNC BANK CORP.                 COMMON    693475105   14,089     244,500   SHRS          SOLE         NONE     244,500
POGO PRODUCING CO.             COMMON    730448107      931      50,000   SHRS          SOLE         NONE      50,000
PRIDE INTERNATIONAL INC.       COMMON    741932107      382      36,200   SHRS          SOLE         NONE      36,200
QUIDEL CORP.                   COMMON    74838J101    1,769     555,000   SHRS          SOLE         NONE     555,000
RALSTON PURINA CO.             COMMON    751277302    8,218     270,000   SHRS          SOLE         NONE     270,000
RANGE RESOURCES CORP.          COMMON    75281A109    2,819     460,300   SHRS          SOLE         NONE     460,300
RARE HOSPITALITY INTL          COMMON    753820109    8,624     338,200   SHRS          SOLE         NONE     338,200
RAYOVAC CORP.                  COMMON    755081106    7,544     332,500   SHRS          SOLE         NONE     332,500
REGAL-BELOIT CORP.             COMMON    758750103    1,713      72,500   SHRS          SOLE         NONE      72,500
REPUBLIC BANCORP INC (MI)      COMMON    760282103    2,584     170,170   SHRS          SOLE         NONE     170,170
REPUBLIC SERVICES INC CL A     COMMON    760759100   12,375     500,000   SHRS          SOLE         NONE     500,000
</TABLE>


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<TABLE>
<CAPTION>

                                                      FORM 13F INFORMATION TABLE

<S>                            <C>      <C>        <C>       <C>        <C>          <C>          <C>        <C>
RICHARDSON ELECTRONICS         COMMON    763165107    2,175     319,200   SHRS          SOLE         NONE     319,200
RICHFOOD HOLDINGS INC.         COMMON    763408101    9,302     527,800   SHRS          SOLE         NONE     527,800
RITE AID CORP                  COMMON    767754104    4,925     200,000   SHRS          SOLE         NONE     200,000
ROCHESTER MEDICAL CORP.        COMMON    771497104    1,975     197,500   SHRS          SOLE         NONE     197,500
ROYAL CARIBBEAN CRUISES        COMMON    V7780T103    3,500      80,000   SHRS          SOLE         NONE      80,000
RUBY TUESDAY INC.              COMMON    781182100    2,643     139,100   SHRS          SOLE         NONE     139,100
ST. JUDE MEDICAL INC.          COMMON    790849103    4,453     125,000   SHRS          SOLE         NONE     125,000
ST. PAUL BANCORP               COMMON    792848103    3,188     125,000   SHRS          SOLE         NONE     125,000
SAVOIR TECHNOLOGY GROUP        COMMON    80533W107    4,547     485,000   SHRS          SOLE         NONE     485,000
SCHLUMBERGER LTD.              COMMON    806857108    2,548      40,000   SHRS          SOLE         NONE      40,000
SEAMED CORP.                   COMMON    81218Q100    2,350     200,000   SHRS          SOLE         NONE     200,000
SOUTHTRUST CORP.               COMMON    844730101   10,198     265,750   SHRS          SOLE         NONE     265,750
SPORTSLINE USA INC             COMMON    848934105      504      14,045   SHRS          SOLE         NONE      14,045
SPSS INC.                      COMMON    78462K102    7,321     285,000   SHRS          SOLE         NONE     285,000
STEWART ENTERPRISES INC CL A   COMMON    860370105    9,830     675,000   SHRS          SOLE         NONE     675,000
SUN HYDRAULICS INC.            COMMON    866942105    1,588     194,000   SHRS          SOLE         NONE     194,000
SYBRON INTL CORP-WIS.          COMMON    87114F106    3,997     145,000   SHRS          SOLE         NONE     145,000
TBC CORP.                      COMMON    872180104    2,896     410,000   SHRS          SOLE         NONE     410,000
TCF FINANCIAL CORP.            COMMON    872275102    8,920     320,000   SHRS          SOLE         NONE     320,000
TESSCO TECHNOLOGIES            COMMON    872386107    3,333     155,000   SHRS          SOLE         NONE     155,000
TEXACO, INC.                   COMMON    881694103    6,875     110,000   SHRS          SOLE         NONE     110,000
TIDEWATER INC.                 COMMON    886423102    2,466      80,844   SHRS          SOLE         NONE      80,844
TYSON FOODS INC CLASS A        COMMON    902494103    6,750     300,000   SHRS          SOLE         NONE     300,000
UNION PLANTERS CORP            COMMON    908068109    8,044     180,000   SHRS          SOLE         NONE     180,000
UNITED STATIONERS INC.         COMMON    913004107    5,346     243,000   SHRS          SOLE         NONE     243,000
UROLOGIX INC.                  COMMON    917273104      247     100,000   SHRS          SOLE         NONE     100,000
USA TRUCK INC.                 COMMON    902925106    1,145     125,000   SHRS          SOLE         NONE     125,000
UST INC.                       COMMON    902911106   11,408     390,000   SHRS          SOLE         NONE     390,000
USX-MARATHON GROUP             COMMON    902905827    4,233     130,000   SHRS          SOLE         NONE     130,000
VARI-LITE INTL. INC.           COMMON    922152103      383     180,000   SHRS          SOLE         NONE     180,000
VERISIGN INC                   COMMON    92343E102    1,062      12,312   SHRS          SOLE         NONE      12,312
VIDAMED INC.                   COMMON    926530106      666     367,500   SHRS          SOLE         NONE     367,500
WABASH NATL. CORP.             COMMON    929566107    8,072     416,600   SHRS          SOLE         NONE     416,600
WALGREEN CO.                   COMMON    931422109   38,217   1,301,000   SHRS          SOLE         NONE   1,301,000
WARNER-LAMBERT CO              COMMON    934488107    4,856      70,000   SHRS          SOLE         NONE      70,000
</TABLE>


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<TABLE>
<CAPTION>

                                                      FORM 13F INFORMATION TABLE

<S>                            <C>      <C>        <C>       <C>        <C>          <C>          <C>        <C>
WASHINGTON FEDERAL INC.        COMMON    938824109   10,326     460,231   SHRS          SOLE         NONE     460,231
WASHINGTON MUTUAL INC.         COMMON    939322103    2,653      75,000   SHRS          SOLE         NONE      75,000
WATSON PHARMACEUTICALS         COMMON    942683103    6,311     180,000   SHRS          SOLE         NONE     180,000
WOLVERINE TUBE INC.            COMMON    978093102    1,759      70,000   SHRS          SOLE         NONE      70,000
</TABLE>



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