<Page>

                                                                    Exhibit 4.1


                      UNITED WISCONSIN GRAIN PRODUCERS, LLC
                             SUBSCRIPTION AGREEMENT
                                Membership Units

                                 $1,000 PER UNIT

                       10 UNIT MINIMUM PURCHASE ($10,000)

The undersigned subscriber, desiring to become a member of United Wisconsin
Grain Producers, LLC ("UWGP"), a Wisconsin limited liability company, with its
principal place of business at PO BOX 247 Richland Street, Friesland, Wisconsin,
53935, hereby subscribes for the purchase of the membership interests of UWGP,
and agrees to pay the related purchase price, identified below.

A.       SUBSCRIBER INFORMATION. Please print your individual or entity name and
address. Joint subscribers should provide their respective names. Your name and
address will be recorded exactly as printed below.

   1.      Subscriber's Printed Name        ____________________________________
   2.      Title, if applicable:            ____________________________________
   3.      Subscriber's Address:
                Street                      ____________________________________
                City, State, Zip Code       ____________________________________

B.       NUMBER OF UNITS PURCHASED. You must purchase at least 10 units. Your
ownership interest may not exceed 30% of all of our outstanding membership
units. Accordingly, assuming that we sell the minimum number of 19,250 Units in
this Offering, you may not purchase more than 6,207 Units. We presently have
1,280 Units outstanding.

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


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




C.       PURCHASE PRICE. Indicate the dollar amount of your investment.

<Table>
<Caption>
      1. Total Purchase Price         =         2. Ten Percent (10%) 1st       +      3. Ninety Percent (90%) 2nd
         --------------------                      ----------------------                -------------------------
($1,000 per Unit  multiplied  by the                   Installment                             Installment
number in box B above.)                               -----------                             -----------
                                             (10% of the Total Purchase Price)         (90%  of the  Total  Purchase
                                                                                       Price)
<S>                                         <C>                                        <C>
-------------------------------------       ----------------------------------        ------------------------------
                                        =                                         +
-------------------------------------       ----------------------------------        ------------------------------
</Table>

D.       GENERAL INSTRUCTIONS FOR SUBSCRIBERS:

You should read the Prospectus dated [Date of Effectiveness] (the "Prospectus")
in its entirety including financial statements and exhibits for a complete
explanation of an investment in UWGP. To subscribe, you must:

         1.       Complete all information required in this Subscription
Agreement, and date and sign this Subscription Agreement at page 5.
         2.       Complete all information required by the Member Signature Page

of the Operating Agreement, and date and sign the Member Signature Page (the
last page attached to this Subscription Agreement).

         3.       Immediately provide your personal (or business) check for the
first installment of ten percent (10%) of your investment amount made payable to
"U.S. BANK -- ESCROW AGENT FOR UWGP". You will determine this amount in box C.2
on page 1 of this Subscription Agreement.


                                       1
<Page>

         4.       Execute the Promissory Note and Security Agreement on page 7
of this Subscription Agreement evidencing your commitment to pay the remaining
ninety percent (90%) due for the Units that is attached to this Subscription
Agreement and your agreement to grant UWGP a security interest in your
membership units.

         5.       Deliver each of the original executed documents referenced in
Items 1, 2, and 4 of these Instructions, together with your personal check
described in Item 3 of these Instructions to any one of the UWGP board members
listed below or via mail to:

                        US Bank Corporate Trust Services
                    1555 North River Center Drive, Suite 301
                               Milwaukee, WI 53212

         6.       Secure an additional personal (or business) check for the
second installment of ninety percent (90%) of your investment amount made
payable to "U.S. BANK -- ESCROW AGENT FOR UWGP" in satisfaction of the
Promissory Note. You will determine this amount in box C.3 on page 1 of this
Subscription Agreement. Deliver this check to the same address set forth above
in Instruction 5 within twenty (20) days of the date of UWGP's written notice
that its sales of Units have exceeded the Minimum Escrow Deposit of $19,250,000.

Your funds will be placed in UWGP's escrow account US Bank Corporate Trust
Services, and the funds will be released to UWGP or returned to you in
accordance with the escrow arrangements described in the Prospectus. If UWGP
rejects your subscription, your Subscription Agreement and investment will be
returned to you within 30 days of such rejection, plus nominal interest, minus
escrow fees. UWGP may not consider the acceptance or rejection of your
subscription until a future date near the end of this Offering.

YOU MAY DIRECT YOUR QUESTIONS TO ONE OF OUR DIRECTORS LISTED BELOW OR TO UWGP AT
(920) 635-4282.

<Table>
<Caption>
                                           Additional                                                  Additional
                        Telephone           Telephone                              Telephone           Telephone
     Director             Number             Number              Director            Number              Number
     --------           ---------          ----------            --------          ---------           ----------
<S>                   <C>                  <C>                <C>                 <C>                 <C>
Mr. Kevin M. Roche    (920) 210-2490                          Cal Dalton          (608) 429-2544      (608) 444-1571
William R.
Herrmann              (920) 623-3729                          Jerry Franz         (608) 635-4093
Robert Miller         (262) 966-2702                          Carl Benck          (920) 484-3943      (920) 948-3127
Bob Lange             (920) 623-3317                          Berwyn Westra       (920) 326-3885
</Table>


E.       ADDITIONAL SUBSCRIBER INFORMATION. The subscriber, named above,
certifies the following under penalties of perjury:

         1.       FORM OF OWNERSHIP. Check the appropriate box (one only) to
                  indicate form of ownership. If the subscriber is a Custodian,
                  Corporation, Partnership or Trust, please provide the
                  additional information requested.

                    ?         Individual

                    ?         Joint Tenants with Right of Survivorship (Both
                              signatures must appear below)

                    ?         Corporation or Partnership (Corporate Resolutions
                              or Partnership Agreement must be enclosed)

                    ?         IRA

                    ?         KEOGH

                    ?         Pension or Profit Sharing Plan

                    ?         Trust

                              Trustee's Name: __________________________________


                                       2
<Page>

                              Trust Date: ______________________________________

                    ?         Other: Provide detailed information in the space
                              immediately below.

          2.        SUBSCRIBER'S TAXPAYER INFORMATION. Check the appropriate box
                    if you are a non-resident alien, a U.S. Citizen residing
                    outside the United States or subject to back up withholding.
                    KEOGHS should provide the taxpayer identification number of
                    the account and the social security number of the
                    accountholder. Trusts should provide their taxpayer
                    identification number. Custodians should provide the minor's
                    social security number. All individual subscribers and IRA
                    subscribers should provide their social security number.
                    Other entities should provide their taxpayer identification
                    number.

                    ?         Check box if you are a non-resident alien

                    ?         Check box if you are a U.S. citizen residing
                              outside of the United States

                    ?         Check this box if you are subject to backup
                              withholding

                    Subscriber's Social Security No.
                                                     ---------------------------
                    Joint Subscribers Social Security No.
                                                           ---------------------
                    Taxpayer Identification No.
                                                --------------------------------

          3.        MEMBER REPORT ADDRESS. If you would like duplicate copies of
                    member reports sent to an address that is different than the
                    address identified in section A, please complete this
                    section.

                    Address:
                               -------------------------------------------------

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

          4.        STATE OF RESIDENCE.

                    State of Principal Residence:
                                                             -------------------

                    State where driver's license is issued
                                                             -------------------

                    State where income taxes are filed
                                                             -------------------

                    State(s) in which you have maintained your principal
                    residence during the past three years:

<Table>
<S><C>
                    ---------------------------------- -------------------------------- --------------------------------
                    a.                                 b.                               c.
                    ---------------------------------- -------------------------------- --------------------------------
</Table>


          5.        SUITABILITY STANDARDS. You cannot invest in UWGP unless you
                    meet one, or more, of the suitability tests set forth below.
                    Please review the suitability tests and check the box(es)
                    next to the following suitability test that you meet. For
                    husbands and wives purchasing jointly, the tests above will
                    be applied on a joint basis.

                    ?         I (We) have annual income from whatever source of
                              at least $30,000 and a net worth of at least
                              $30,000, exclusive of home, furnishings and
                              automobiles; or

                    ?         I (We) have a net worth of at least $75,000,
                              exclusive of home, furnishings and automobiles.

         6.       SUBSCRIBER'S REPRESENTATIONS AND WARRANTIES. You must read and
                  certify your representations and warranties and sign and date
                  this Subscription Agreement.


                                       3
<Page>

                    By signing below the subscriber represents and warrants to
UWGP that he, she or it:

                    a.   has received a copy of and is familiar with and
                         understands UWGP's Prospectus, and all modifications or
                         supplements thereto ;
                    b.   has relied solely upon the Prospectus in evaluating the
                         purchase of the Units;
                    c.   has been informed that the Units of UWGP are offered
                         and sold in reliance upon a federal securities
                         registration, Illinois, Ohio and Wisconsin securities
                         registrations, and exemptions from securities
                         registrations in various other states, and understands
                         that the Units to be issued pursuant to this
                         subscription agreement can only be sold to a person
                         meeting requirements of suitability;
                    d.   has been informed that the securities purchased
                         pursuant to this Subscription Agreement have not been
                         registered under the securities laws of any state other
                         than the States of Illinois, Ohio, and Wisconsin, and
                         that UWGP is relying in part upon the representations
                         of the undersigned Subscriber contained herein;
                    e.   has been informed that the securities subscribed for
                         have not been approved or disapproved by the Securities
                         and Exchange Commission or the Illinois, Ohio and
                         Wisconsin Securities Departments or any other
                         regulatory authority, nor has any regulatory authority
                         passed upon the accuracy or adequacy of the Prospectus;
                    f.   intends to acquire the Units for his/her/its own
                         account without a view to public distribution or resale
                         and that he/she/it has no contract, undertaking,
                         agreement or arrangement to sell or otherwise transfer
                         or dispose of any Units or any portion thereof to any
                         other person;
                    g.   understands that there is no present market for UWGP's
                         membership units, that the membership units will not
                         trade on an exchange or automatic quotation system,
                         that no such market is expected to develop in the
                         future and that there are significant restrictions on
                         the transferability of the membership units;
                    h.   has received a copy of the UWGP Operating Agreement,
                         and understands that upon closing the escrow by UWGP,
                         the subscriber and the membership units will be bound
                         by the provisions of the Operating Agreement which
                         contains, among other things, provisions that restrict
                         the transfer of membership units;
                    i.   understands that the Units are subject to substantial
                         restrictions on transfer under federal and state
                         securities laws along with restrictions in the UWGP
                         Operating Agreement and agrees that if the membership
                         units or any part thereof are sold or distributed in
                         the future, the subscriber shall sell or distribute
                         them pursuant to the terms of the Operating Agreement,
                         and the requirements of the Securities Act of 1933, as
                         amended, and applicable state securities laws;
                    j.   meets the suitability test marked in Item 5 above and
                         is capable of bearing the economic risk of this
                         investment, including the possible total loss of the
                         investment;
                    k.   understands that UWGP will place a restrictive legend
                         on any certificate representing any unit containing
                         substantially the following language as the same may be
                         amended by the Directors of UWGP in their sole
                         discretion:

                              THE TRANSFERABILITY OF THE UNITS REPRESENTED BY
                              THIS CERTIFICATE IS RESTRICTED. SUCH UNITS MAY NOT
                              BE SOLD, ASSIGNED, OR TRANSFERRED, NOR WILL ANY
                              ASSIGNEE, VENDEE, TRANSFEREE, OR ENDORSEE THEREOF
                              BE RECOGNIZED AS HAVING ACQUIRED ANY SUCH UNITS
                              FOR ANY PURPOSES, UNLESS AND TO THE EXTENT SUCH
                              SALE, TRANSFER, HYPOTHECATION, OR ASSIGNMENT IS
                              PERMITTED BY, AND IS COMPLETED IN STRICT
                              ACCORDANCE WITH, APPLICABLE STATE AND FEDERAL LAW
                              AND THE TERMS AND CONDITIONS SET FORTH IN THE
                              OPERATING AGREEMENT AS AGREED TO BY EACH MEMBER.

                              THE SECURITIES REPRESENTED BY THIS CERTIFICATE MAY
                              NOT BE SOLD, OFFERED FOR SALE, OR TRANSFERRED IN
                              THE ABSENCE OF EITHER AN EFFECTIVE REGISTRATION
                              UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND
                              UNDER APPLICABLE STATE SECURITIES LAWS, OR AN
                              OPINION OF COUNSEL SATISFACTORY TO THE COMPANY
                              THAT SUCH TRANSACTION IS EXEMPT FROM REGISTRATION
                              UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND
                              UNDER APPLICABLE STATE SECURITIES LAWS.


                                       4
<Page>

                    l.   and that, to enforce the above legend, UWGP may place a
                         stop transfer order with its registrar and stock
                         transfer agent (if any) covering all certificates
                         representing any of the membership units;
                    m.   has knowledge and experience in business and financial
                         matters as to be able to evaluate the merits and risks
                         of an investment in the Units, believes that the
                         investment in Units is suitable for the subscriber and
                         can bear the economic risk of the purchase of Units
                         including the total loss of the undersigned's
                         investment;
                    n.   may not transfer or assign this subscription agreement,
                         or any of the subscriber's interest herein;
                    o.   has written his, her, or its correct taxpayer
                         identification number under Item 2 on this subscription
                         agreement; and
                    p.   is not subject to back up withholding either because
                         he, she or it has not been notified by the Internal
                         Revenue Service ("IRS") that he, she or it is subject
                         to backup withholding as a result of a failure to
                         report all interest or dividends, or the IRS has
                         notified him, her or it that he is no longer subject to
                         backup withholding (Note this clause (p) should be
                         crossed out if the backup withholding box in Item 2 is
                         checked).
                    q.   understands that execution of the attached Promissory
                         Note and Security Agreement will allow UWGP or its
                         assigns to pursue the obligor for payment of the amount
                         due thereon by any legal means, including, but not
                         limited to, acquisition of a judgment against the
                         obligor in the event that the subscriber defaults on
                         that Promissory Note; and
                    r.   Acknowledges that UWGP may retain possession of
                         certificates representing subscriber's Units to perfect
                         its security interest in those Units.


SIGNATURE OF SUBSCRIBER/ JOINT SUBSCRIBER:

DATE:
            -----------------------------------------

<Table>
<S><C>
INDIVIDUALS:                                                           ENTITIES:


--------------------------------------------------------    -------------------------------------------
     Name of Individual Subscriber (Please Print)             Name of Entity (Please Print)



--------------------------------------------------------    -------------------------------------------
     Signature of Individual                                  Print Name and Title of Officer



--------------------------------------------------------    -------------------------------------------
     Name of Joint Individual Subscriber (Please Print)           Signature of Officer




--------------------------------------------------------
     Signature of Joint Individual Subscriber
</Table>

                                       5
<Page>

       ACCEPTANCE OF SUBSCRIPTION BY UNITED WISCONSIN GRAIN PRODUCERS, LLC

United Wisconsin Grain Producers, LLC hereby accepts the subscription for the
above Units.

Dated this           day of                                        , 200       .
           ---------        ---------------------------------------     -------


UNITED WISCONSIN GRAIN PRODUCERS, LLC


By:
   ---------------------------------------


Its:
    --------------------------------------


                                       6
<Page>



                     PROMISSORY NOTE AND SECURITY AGREEMENT
                                 $1,000 PER UNIT
                       10 UNIT MINIMUM PURCHASE ($10,000)

Date of Subscription Agreement: ___________________________________, 200__.

                      Number of Units subscribed
---------------------

                      Total Purchase Price ($1,000 per Unit multiplied by
                      number of Units subscribed)
---------------------

   (           )      Less Initial Payment (10% of Principal Amount)
---------------------

                      Principal Balance
---------------------

FOR VALUE RECEIVED, the undersigned hereby promises to pay to the order of
United Wisconsin Grain Producers, LLC, a Wisconsin limited liability company
("UWGP"), at its principal office located at PO BOX 247 Richland Street,
Friesland, Wisconsin, 53935, or at such other place as required by UWGP, the
Principal Balance set forth above in one lump sum to be paid without interest
within 20 days following the call of the UWGP Board of Directors, as described
in the Subscription Agreement. In the event the undersigned fails to timely make
any payment owed, the entire balance of any amounts due under this Promissory
Note and Security Agreement shall be immediately due and payable in full with
interest at the rate of 12% per annum from the due date.


The undersigned agrees to pay to UWGP on demand, all costs and expenses incurred
to collect any indebtedness evidenced by this Promissory Note and Security
Agreement, including, without limitation, reasonable attorneys' fees. This
Promissory Note and Security Agreement may not be modified orally and shall in
all respects be governed by, construed, and enforced in accordance with the laws
of the State of Wisconsin.


The provisions of this Promissory Note and Security Agreement shall inure to the
benefit of UWGP and its successors and assigns.


The undersigned waives presentment, demand for payment, notice of dishonor,
notice of protest, and all other notices or demands in connection with the
delivery, acceptance, performance or default of this Promissory Note and
Security Agreement.


The undersigned grants to UWGP, and its successors and assigns ("Secured
Party"), a purchase money security interest in all of the undersigned's
Membership Units of UWGP now owned or hereafter acquired. This security interest
is granted as non-exclusive collateral to secure payment and performance on the
obligation owed Secured Party from the undersigned evidenced by this Promissory
Note. The undersigned further authorizes Secured Party to retain possession of
certificates representing such Membership Units and to take any other actions
necessary to perfect the security interest granted herein.

<Table>
<S><C>
Dated:              , 200  .
OBLIGOR/DEBTOR:                                         JOINT OBLIGOR/DEBTOR:


---------------------------------------------    -------------------------------------------
Printed or Typed Name of Joint Obligor           Printed or Typed Name of Obligor

By:                                             By:
   ------------------------------------------      -----------------------------------------
   [Signature)                                     [Signature)


---------------------------------------------
Officer Title if Obligor is an Entity


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

---------------------------------------------
Address of Obligor
</Table>


                                       7
<Page>

                              MEMBER SIGNATURE PAGE

                                     ADDENDA
                                     TO THE
                      UNITED WISCONSIN GRAIN PRODUCERS, LLC
                               OPERATING AGREEMENT


         The undersigned does hereby represent and warrant that the undersigned,
as a condition to becoming a Member in United Wisconsin Grain Producers, LLC
(the "Company"), has received a copy of the Operating Agreement, dated November
2, 2001, and, if applicable, all amendments and modifications thereto, and does
hereby agree that the undersigned, along with the other parties to the Operating
Agreement, shall be subject to and comply with all terms and conditions of said
Operating Agreement in all respects as if the undersigned had executed said
Operating Agreement on the original date thereof and that the undersigned is and
shall be bound by all of the provisions of said Agreement from and after the
date of execution hereof.


<Table>
<S><C>
INDIVIDUALS:                                                              ENTITIES:


---------------------------------------------------------------     ---------------------------------------------------
     Name of Individual Subscriber (Please Print or Type)                 Name of Entity (Please Print or Type)



---------------------------------------------------------------     ---------------------------------------------------
     Signature of Individual                                              Print Name and Title of Officer



---------------------------------------------------------------     ---------------------------------------------------
     Name of Joint Individual Subscriber (Please Print or Type)           Signature of Officer



---------------------------------------------------------------
     Signature of Joint Individual Subscriber
</Table>


Agreed and accepted on behalf of the
Company and its Members:

UNITED WISCONSIN GRAIN PRODUCERS, LLC


By:
   ------------------------------------------------------------


Its:
    -----------------------------------------------------------