NATIONAL PRESTO INDUSTRIES INC
SC 13D, 1999-09-10
ELECTRIC HOUSEWARES & FANS
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<PAGE>   1

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



                                 SCHEDULE 13D
                  UNDER THE SECURITIES EXCHANGE ACT OF 1934
                             (AMENDMENT NO.    )(*)

                       National Presto Industries, Inc.
- --------------------------------------------------------------------------------
                               (NAME OF ISSUER)

                        Common Stock, $1.00 par value
- --------------------------------------------------------------------------------
                        (TITLE OF CLASS OF SECURITIES)

                                  637215104
- --------------------------------------------------------------------------------
                                (CUSIP NUMBER)

David L. Diamond, 28 State Street, 18th Floor, Boston, MA 02109 (617) 747-5806
- --------------------------------------------------------------------------------
                (NAME, ADDRESS AND TELEPHONE NUMBER OF PERSON
              AUTHORIZED TO RECEIVE NOTICES AND COMMUNICATIONS)

                              September 1, 1999
- --------------------------------------------------------------------------------
           (DATE OF EVENT WHICH REQUIRES FILING OF THIS STATEMENT)

         If the filing person has previously filed a statement on Schedule 13G
to report the acquisition which is the subject of this Schedule 13D, and is
filing this schedule because of sections 240.13d-1(e), 240.13d-1(f) or
240.13d-1(g), check the following box [ ].

Note: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See section 240.13d-7 for other
parties to whom copies are to be sent.


- ---------------
        (1)  The remainder of this cover page shall be filled out for a
reporting person's initial filing on this form with respect to the subject
class of securities, and for any subsequent amendment containing information
which would alter disclosures provided in a prior cover page.

        The information required on the remainder of this cover page shall not
be deemed to be "filed" for the purpose of Section 18 of the Securities
Exchange Act of 1934 or otherwise subject to the liabilities of that section of
the Act but shall be subject to all other provisions of the Act (however, see
the Notes).

<PAGE>   2


CUSIP No. 637215104                      13D

  (1)     Names of Reporting Persons
          I.R.S. Identification Nos. of Above Persons (Entities Only)

           High Rock Capital LLC
          ---------------------------------------------------------------------

  (2)     Check the Appropriate Box if a Member of a Group*         (a)   [X]
                                                                    (b)   [ ]


  (3)     SEC Use Only

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

  (4)     SOURCE OF FUNDS(see instructions)
             WC
          ---------------------------------------------------------------------

  (5)     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS
          IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)

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

  (6)     Citizenship or Place of Organization

           DELAWARE
          ---------------------------------------------------------------------

                       (7)     Sole Voting Power
  Number of                    309,300 (See Item 5)
   Shares              --------------------------------------------------------
 Beneficially          (8)     Shared Voting Power
  Owned by                     65,300 (See Item 5)
    Each               --------------------------------------------------------
  Reporting            (9)     Sole Dispositive Power
 Person With                   374,600
                       --------------------------------------------------------
                       (10)    Shared Dispositive Power

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

 (11)     Aggregate Amount Beneficially Owned by Each Reporting Person
          374,600
          ---------------------------------------------------------------------

 (12)     Check Box if Aggregate Amount in Row (11) Excludes Certain
          Shares (See Instructions)

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

 (13)     Percent of Class Represented by Amount in Row (11)
           5.10
          ---------------------------------------------------------------------

 (14)     Type of Reporting Person*
            IA
          ---------------------------------------------------------------------
                    *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>   3


CUSIP No. 637215104                      13D

  (1)     Names of Reporting Persons
          I.R.S. Identification Nos. of Above Persons (Entities Only)

           High Rock Asset Management LLC
          ---------------------------------------------------------------------

  (2)     Check the Appropriate Box if a Member of a Group*         (a)   [X]
                                                                    (b)   [ ]


  (3)     SEC Use Only

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

  (4)     SOURCE OF FUNDS(see instructions)
             WC,OO
          ---------------------------------------------------------------------

  (5)     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS
          IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)

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

  (6)     Citizenship or Place of Organization

           DELAWARE
          ---------------------------------------------------------------------

                       (7)     Sole Voting Power
  Number of                    5,100
   Shares              --------------------------------------------------------
 Beneficially          (8)     Shared Voting Power
  Owned by
    Each               --------------------------------------------------------
  Reporting            (9)     Sole Dispositive Power
 Person With                   5,100
                       --------------------------------------------------------
                       (10)    Shared Dispositive Power

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

 (11)     Aggregate Amount Beneficially Owned by Each Reporting Person
          5,100
          ---------------------------------------------------------------------

 (12)     Check Box if Aggregate Amount in Row (11) Excludes Certain
          Shares (See Instructions)

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

 (13)     Percent of Class Represented by Amount in Row (11)
           .07
          ---------------------------------------------------------------------

 (14)     Type of Reporting Person*
            IA
          ---------------------------------------------------------------------
                    *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>   4


CUSIP No. 637215104                      13D

  (1)     Names of Reporting Persons
          I.R.S. Identification Nos. of Above Persons (Entities Only)

          Diamond Partners LLC
          ---------------------------------------------------------------------

  (2)     Check the Appropriate Box if a Member of a Group*         (a)   [X]
                                                                    (b)   [ ]


  (3)     SEC Use Only

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

  (4)     SOURCE OF FUNDS(see instructions)
             WC,OO
          ---------------------------------------------------------------------

  (5)     CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS
          IS REQUIRED PURSUANT TO ITEMS 2(d) OR 2(e)

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

  (6)     Citizenship or Place of Organization

           DELAWARE
          ---------------------------------------------------------------------

                       (7)     Sole Voting Power
  Number of                    6,700
   Shares              --------------------------------------------------------
 Beneficially          (8)     Shared Voting Power
  Owned by
    Each               --------------------------------------------------------
  Reporting            (9)     Sole Dispositive Power
 Person With                   6,700
                       --------------------------------------------------------
                       (10)    Shared Dispositive Power

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

 (11)     Aggregate Amount Beneficially Owned by Each Reporting Person
          6,700
          ---------------------------------------------------------------------

 (12)     Check Box if Aggregate Amount in Row (11) Excludes Certain
          Shares (See Instructions)

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

 (13)     Percent of Class Represented by Amount in Row (11)
           .09
          ---------------------------------------------------------------------

 (14)     Type of Reporting Person*
            OO
          ---------------------------------------------------------------------
                    *SEE INSTRUCTIONS BEFORE FILLING OUT!


<PAGE>   5




Item 1.     Security and Issuer.

     This statement relates to the shares of the common stock, $1.00 par value
(the "Common Stock"), of National Presto Industries, Inc. (the "Company"). The
Company's principal executive offices are located at 3925 North Hastings Way,
Eau Claire, WI 54703-3703.


Item 2.     Identity and Background.

         (a)This statement is being filed by High Rock Capital LLC ("HRC"), a
Delaware limited liability company, High Rock Asset Management LLC ("HRAM"), a
Delaware limited liability company and Diamond Partners LLC ("DP") a Delaware
limited liability company. The foregoing persons are hereinafter sometimes
referred to as the "Reporting Persons."

         (b) The address of the principal business and principal office of HRC,
HRAM and DP is 28 State Street, 18th Floor, Boston, MA 02109.

         (c) The principal business of HRC is that of an investment adviser
registered under the Investment Advisers Act of 1940, as amended. HRC is an
investment manager providing discretionary managed account services for employee
benefit plans, endowments, foundations and others. The principal business of
HRAM is that of an investment adviser registered under the Investment Advisers
Act of 1940, as amended. HRAM is an investment manager providing discretionary
managed account services for private investors, endowments, foundations and
others. HRAM is also the parent company and sole member of HRC. The principal
business of Diamond Partners LLC is that of a limited liability company
investing in various securities. HRAM is the investment manager to DP.

          David L. Diamond is the  President of HRC. Mr.  Diamond also serves as
     President and Sole Member of HRAM. The business  address for Mr. Diamond is
     28 State Street, 18th Floor, Boston, MA 02109.

         (d) During the last five years, none of the persons referred to in this
Item 2 has been convicted in a criminal proceeding (excluding traffic violations
or similar misdemeanors).

         (e) During the last five years, none of the persons referred to in this
Item 2, has been a party to a civil proceeding of a judicial or administrative
body of competent jurisdiction and as a result of such proceeding was or is
subject to a judgment, decree or final order enjoining future violations of, or
prohibiting or mandating activities subject to, federal or state securities laws
or finding any violation with respect to such laws.

         (f) HRC, HRAM and DP are limited liability companies organized under
the laws of Delaware. Mr. Diamond is a United States Citizen.



Item 3.     Source and Amount of Funds and Other Consideration.

     The net investment cost (including commissions, if any) of the shares of
Common Stock held by HRC, HRAM and DP is $14,625,211, $198,167 and $259,860
respectively. The shares of Common Stock held by HRC were purchased with working
capital. The shares of Common Stock held by HRAM and DP were purchased on
margin. HRAM's and DP's margin transactions are with Morgan Stanley Dean Witter
on such firm's usual terms and conditions.



Item 4.     Purpose of the Transaction.

     The purpose of the acquisition of the shares of Common Stock by the
Reporting Persons is for investment, and the purchases of the shares of Common
Stock by the Reporting Persons were made in the ordinary course of business and
were not made for the purpose of acquiring control of the Company. Although the
acquisition of the shares of Common Stock by the Reporting Persons is for
investment purposes, each Reporting Person will pursue discussions with

<PAGE>   6


management to maximize long-term value for shareholders. Each of the Reporting
Persons may make further purchases of shares of Common Stock from time to time
and may dispose of any or all of the shares of Common Stock held by it at any
time. None of the Reporting Persons have any plans or proposals which relate to,
or could result in, any of the matters referred to in paragraphs (b) through
(j), inclusive, of Item 4 of Schedule 13D. Each of the Reporting Persons may, at
any time and from time to time, review or reconsider their position and
formulate plans or proposals with respect thereto, but have no present intention
of doing so.



Item 5.     Interest in Securities of the Issuer.

       A. High Rock Capital LLC

              (a) Aggregate number of shares beneficially owned: 374,600
                 Percentage: 5.10%  The percentages used herein and in
                 the rest of Item 5 are calculated based upon the
                 7,343,846 shares of Common Stock issued and outstanding as
                 of July 4, 1999, as reflected in the Company's Form 10Q for
                 the period ending July 4, 1999.

              (b) 1. Sole power to vote or direct vote: 309,300

                  2. Shared power to vote or direct vote: 65,300
                    (i) High Rock Capital LLC does not have the authority
                     to vote 65,300 shares
                  3. Sole power to dispose or direct the disposition: 374,600
                  4. Shared power to dispose or direct the disposition: -0-

              (c) The trading dates, number of shares of Common Stock purchased
or sold and the price per share for all transactions in the Common Stock within
the last sixty days, which were all in the open market, are set forth in
Schedule A and are incorporated by reference.

              (d) The investment advisory clients of High Rock Capital LLC have
the sole right to receive and, subject to the notice, withdrawal and /or
termination provisions of such advisory contracts the sole power to direct the
receipt of dividends from, and the proceeds of sale of, any of the Common Stock
owned by such Reporting Persons. Except as noted, no such client has an interest
by virtue of such relationship that relates to more than 5% of the Common Stock.

              (e) Not Applicable.

       B. High Rock Asset Management LLC
              (a) Aggregate number of shares beneficially owned: 5,100
                         Percentage: 0.07%
              (b) 1. Sole power to vote or direct vote: 5,100
                  2. Shared power to vote or direct vote: -0-
                  3. Sole power to dispose or direct the disposition: 5,100
                  4. Shared power to dispose or direct the disposition: -0-

              (c) The trading dates, number of shares of Common Stock purchased
or sold and the price per share for all transactions in the Common Stock within
the last sixty days, which were all in the open market, are set forth in
Schedule B and are incorporated by reference.

              (d) The investment advisory clients of High Rock Asset Management
LLC have the sole right to receive and, subject to the notice, withdrawal and
/or termination provisions of such advisory contracts, the sole power to direct
the receipt of dividends from, and the proceeds of sale of, any of the Common
Stock owned by such Reporting Persons. Except as noted, no such client has an
interest by virtue of such relationship that relates to more than 5% of the
Common Stock.
              (e)  Not Applicable.


         C. Diamond Partners LLC
              (a) Aggregate number of shares beneficially owned: 6,700
                         Percentage: 0.09%
              (b) 1. Sole power to vote or direct vote: 6,700
                  2. Shared power to vote or direct vote: -0-
                  3. Sole power to dispose or direct the disposition: 6,700
                  4. Shared power to dispose or direct the disposition: -0-

              (c) The trading dates, number of shares of Common Stock purchased
or sold and the price per share for all transactions in the Common Stock within
the last sixty days, which were all in the open market, are set forth in
Schedule C and are incorporated by reference.

              (d) High Rock Asset Management LLC, the investment manager to DP,
has the power to direct the affairs of DP, including decisions regarding the


<PAGE>   7
disposition of the proceeds from the sale of Common Stock. Mr. Diamond is the
Sole Member and President of High Rock Asset Management LLC and in that capacity
directs its operations.
                  (e)  Not Applicable.



 .

Item 6.     Contracts, Arrangements, Understandings or
            Relationships with Respect to Securities of the Issuer.

     Other than as described in this Schedule 13D, there are no contracts,
arrangements, understandings or relationships (legal or otherwise) among the
persons named in Item 2 hereof and between such persons and any person with
respect to any securities of the Company, including but not limited to transfer
or voting of any other securities, finder's fees, joint ventures, loan or option
arrangements, puts or calls, guarantees of profits, divisions of profits or
loss, or the giving or withholding of proxies.


Item 7.     Materials to be Filed as Exhibits.

     There is filed herewith as Exhibit 1 a written agreement relating to the
filing of joint acquisition statements as required by Rule 13d-1(f)(1) under the
Securities Exchange Act of 1934, as amended.



                                 SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, the
undersigned certify that the information set forth in this statement is true,
complete and correct.


DATED:  September 10, 1999          /s/ David L. Diamond
                                    David L. Diamond, as
                                    President/Sole Member of High Rock
                                    Asset Management LLC, the Investment Manager
                                    to Diamond Partners LLC and as President
                                    of High Rock Capital LLC




<PAGE>   8



                                            EXHIBIT 1





JOINT ACQUISITION STATEMENT
PURSUANT TO RULE 13D-1(f)1


The undersigned acknowledge and agree that the foregoing statement on Schedule
13D, as amended, is filed on behalf of each of the undersigned and that all
subsequent amendments to this statement on Schedule 13D, as amended, shall be
filed on behalf of each of the undersigned without the necessity of filing
additional joint acquisition statements. The undersigned acknowledge that each
shall be responsible for the timely filing of such amendments, and for the
completeness and accuracy of the information concerning him or it contained
therein, but shall not be responsible for the completeness and accuracy of the
information concerning the other, except to the extent that he or it knows or
has reason to believe that such information is inaccurate.



September 10 ,1999

                                    /s/ David L. Diamond
                                    David L. Diamond, as
                                    President/Sole Member of High Rock
                                    Asset Management LLC, the Investment Manager
                                    to Diamond Partners LLC and as President
                                    of High Rock Capital LLC



























<PAGE>   9
                                  SCHEDULE A


                            HIGH ROCK CAPITAL LLC
<TABLE>
<CAPTION>
                  Date of              Number of Shares             Price per Share
                Transaction            Purchased/(Sold)       (incl. Commissions, if any)

                <S>                   <C>                       <C>
                  7/1/99                     7,500                       38.51
                  7/2/99                     2,000                       38.87
                  7/6/99                     2,600                       38.83
                  7/7/99                     5,100                       38.88
                  7/8/99                     6,600                       38.85
                  7/9/99                     1,900                       39.18
                  7/12/99                   17,900                       39.63
                  7/13/99                   10,100                       39.56
                  7/14/99                   11,500                       40.03
                  7/15/99                   13,800                       40.84
                  7/20/99                    1,000                       40.06
                  7/26/99                    4,400                       38.84
                  7/28/99                     500                        38.47
                  8/23/99                   34,500                       38.29
                  8/24/99                   40,600                       38.81
                  8/25/99                   41,200                       39.18
                  8/26/99                   61,200                       39.11
                  8/31/99                   32,000                       39.30
                  9/1/99                    37,300                       39.28

</TABLE>
<PAGE>   10
                                  SCHEDULE B

                        HIGH ROCK ASSET MANAGEMENT LLC
<TABLE>
<CAPTION>
                  Date of              Number of Shares             Price per Share
                Transaction            Purchased/(Sold)       (incl. Commissions, if any)

                <S>                    <C>                     <C>
                  8/23/99                    1,000                       38.29
                  8/26/99                    2,000                       39.11
                  8/31/99                      500                       39.30
                  9/1/99                       400                       39.28
</TABLE>
<PAGE>   11
                                  SCHEDULE C


                             DIAMOND PARTNERS LLC
<TABLE>
<CAPTION>
                  Date of              Number of Shares             Price per Share
                Transaction            Purchased/(Sold)       (incl. Commissions, if any)

                <S>                    <C>                     <C>
                  8/23/99                    2,900                       38.29
                  8/26/99                    2,800                       39.11
                  8/31/99                      600                       39.30
                  9/1/99                       400                       39.28
</TABLE>


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