MODTECH HOLDINGS INC
SC 13G, 2000-05-03
PREFABRICATED WOOD BLDGS & COMPONENTS
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                              UNITED STATES
                    SECURITIES AND EXCHANGE COMMISSION
                          Washington, D.C. 20549

                                SCHEDULE 13G

                 UNDER THE SECURITIES EXCHANGE ACT OF 1934
                          (AMENDMENT NO.       )*
                                         ------

                           Modtech Holdings, Inc.
- --------------------------------------------------------------------------------
                              (Name of Issuer)

                         Common Stock, par value $.01
- --------------------------------------------------------------------------------
                        (Title of Class of Securities)

                                  60783C100
                     ----------------------------------
                                (CUSIP Number)

                              February 16, 1999
- --------------------------------------------------------------------------------
               (Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:

     / / Rule 13d-1(b)

     / / Rule 13d-1(c)

     /x/ Rule 13d-1(d)

   *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 the disclosures provided in a prior cover page.

   The information required in 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 ("Act") 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).

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CUSIP No. 60783C100
          ---------

- -------------------------------------------------------------------------------
 (1) Names of Reporting Persons.                            Charles A. Hamilton
     I.R.S. Identification Nos. of above persons (entities only).

- -------------------------------------------------------------------------------
 (2) Check the Appropriate Box if a Member   (a)  / /
     of a Group (See Instructions)           (b)  /x/
- -------------------------------------------------------------------------------
 (3) SEC Use Only

- -------------------------------------------------------------------------------
 (4) Citizenship or Place of Organization                         United States

- -------------------------------------------------------------------------------
 Number of Shares             (5) Sole Voting Power               34,500*
 Beneficially
 Owned by                    --------------------------------------------------
 Each Reporting               (6) Shared Voting Power             0
 Person With:
                             --------------------------------------------------
                              (7) Sole Dispositive Power          34,500*

                             --------------------------------------------------
                              (8) Shared Dispositive Power        0

- -------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person 34,500*

- -------------------------------------------------------------------------------
(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares   / /
- -------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)            0.3%

- -------------------------------------------------------------------------------
(12) Type of Reporting Person (See Instructions)                  IN

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

<PAGE>

CUSIP No. 60783C100
          ---------

- -------------------------------------------------------------------------------
 (1) Names of Reporting Persons.
     I.R.S. Identification Nos. of above persons (entities only).

     Infrastructure and Environmental Private Equity Fund III, L.P.  36-4125294

- -------------------------------------------------------------------------------
 (2) Check the Appropriate Box if a Member   (a)  / /
     of a Group (See Instructions)           (b)  /x/
- -------------------------------------------------------------------------------
 (3) SEC Use Only

- -------------------------------------------------------------------------------
 (4) Citizenship or Place of Organization                            Delaware

- -------------------------------------------------------------------------------
 Number of Shares             (5) Sole Voting Power                  1,401,067*
 Beneficially
 Owned by                    --------------------------------------------------
 Each Reporting               (6) Shared Voting Power                0
 Person With:
                             --------------------------------------------------
                              (7) Sole Dispositive Power             1,401,067*

                             --------------------------------------------------
                              (8) Shared Dispositive Power           0

- -------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person    1,401,067*

- -------------------------------------------------------------------------------
(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares    / /
- -------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)               10.6%

- -------------------------------------------------------------------------------
(12) Type of Reporting Person (See Instructions)                     PN

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

<PAGE>

CUSIP No. 60783C100
          ---------

- -------------------------------------------------------------------------------
 (1) Names of Reporting Persons.
     I.R.S. Identification Nos. of above persons (entities only).

     Environmental & Information Technology Private Equity Fund III

- -------------------------------------------------------------------------------
 (2) Check the Appropriate Box if a Member   (a)  / /
     of a Group (See Instructions)           (b)  /x/
- -------------------------------------------------------------------------------
 (3) SEC Use Only

- -------------------------------------------------------------------------------
 (4) Citizenship or Place of Organization           Federal Republic of Germany

- -------------------------------------------------------------------------------
 Number of Shares             (5) Sole Voting Power                350,268*
 Beneficially
 Owned by                    --------------------------------------------------
 Each Reporting               (6) Shared Voting Power              0
 Person With:
                             --------------------------------------------------
                              (7) Sole Dispositive Power           350,268*

                             --------------------------------------------------
                              (8) Shared Dispositive Power         0

- -------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person  350,268*

- -------------------------------------------------------------------------------
(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares    / /
- -------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)             2.6%

- -------------------------------------------------------------------------------
(12) Type of Reporting Person (See Instructions)                   OO

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

<PAGE>

ITEM 1.

    (a)   Name of Issuer

          Modtech Holdings, Inc.
          ---------------------------------------------------------------------

    (b)   Address of Issuer's Principal Executive Offices

          2830 Barrett Avenue
          Perris, CA 92571
          ---------------------------------------------------------------------


ITEM 2.

    (a)   Name of Person Filing

          Charles A. Hamilton ("Hamilton"), Infrastructure and Environmental
          Private Equity Fund III, L.P. ("IEPEF III") and Environmental &
          Information Technology Private Equity Fund III ("EITPEF").
          ---------------------------------------------------------------------

    (b)   Address of Principal Business Office or, if none, Residence

          Hamilton maintains his principal place of business at 6065 Shelter
          Bay Avenue, Mill Valley, California 94941. IEPEF III and EITPEF
          maintain their principal place of business at 233 South Wacker
          Drive, Suite 9500, Chicago, Illinois 60606.
          ---------------------------------------------------------------------

    (c)   Citizenship

          Hamilton is a citizen of the United States. IEPEF III is a Delaware
          limited partnership. EITPEF is a civil partnership with limitation
          of liability established under the laws of the Federal Republic of
          Germany.
          ---------------------------------------------------------------------

    (d)   Title of Class of Securities

          Common Stock, par value $.01
          ---------------------------------------------------------------------

    (e)   CUSIP Number

          60783C100
          ---------------------------------------------------------------------

<PAGE>

ITEM 3.  Not applicable.


ITEM 4.  Ownership

         (a)  Amount beneficially owned

              Hamilton is the record owner of 34,500 shares (which number
              includes 5,000 common stock options at an exercise price of
              $9.25 per share, and 10,000 common stock options at an exercise
              price of $6.00 per share).

              IEPEF III is the record owner of 1,401,067 shares.

              EITPEF is the record owner of 350,268 shares.


         (b)  Percent of Class

              Hamilton is the record owner of 0.3%, based upon 13,258,890
              shares outstanding. IEPEF III is the beneficial owner of 10.6%,
              based upon 13,243,890 shares outstanding. EITPEF is the
              beneficial owner of 2.6%, based upon 13,243,890 shares
              outstanding. The shares used to calculate these percentages
              were reported outstanding on Issuer's 11/12/99 Form 10-Q EDGAR
              filing.

         (c)  Number of shares as to which the person has

              (i)    Sole power to vote or direct the vote

                     Hamilton     34,500 shares
                     IEPEF III    1,401,067 shares
                     EITPEF       350,268 shares

              (ii)   Shared power to vote or direct the vote

                     N/A

              (iii)  Sole power to dispose or to direct the disposition of

                     Hamilton     34,500 shares
                     IEPEF III    1,401,067 shares
                     EITPEF       350,268 shares

              (iv)   Shared power to dispose or to direct the disposition of

                     N/A


ITEM 5.  Not applicable.

<PAGE>

ITEM 6.  Not applicable.


ITEM 7.  Not applicable.


ITEM 8.  See Exhibit 99.1.


ITEM 9.  Not applicable.


ITEM 10. Not applicable.

<PAGE>

                                  SIGNATURE

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

                         Date: April 20, 2000

                         /s/ Charles A. Hamilton
                         -----------------------------------------------
                         CHARLES A. HAMILTON


                         INFRASTRUCTURE AND ENVIRONMENTAL PRIVATE EQUITY
                         FUND III, L.P., a Delaware Limited Partnership

                         By:  Infrastructure and Environmental Private Equity
                              Management III, LLC, its general partner

                         By:  First Analysis IEPEF Management Company III, LLC,
                              its managing member

                         By:  /s/ Bret R. Maxwell
                              ------------------------------------------------
                              Bret R. Maxwell, Managing Member


                         ENVIRONMENTAL & INFORMATION TECHNOLOGY PRIVATE EQUITY
                         FUND III, Gesellschaft burgarlichen Rechts (mit
                         Haftungsbeschankung), a civil partnership with
                         limitation of liability established under the laws of
                         the Federal Republic of Germany

                         By:  Infrastructure and Environmental Private Equity
                              Management III, L.L.C., its Investment Manager

                         By:  First Analysis IEPEF Management Company III, LLC,
                              its Managing Member


                         By:  /s/ Bret R. Maxwell
                              ------------------------------------------------
                              Bret R. Maxwell, Managing Member


<PAGE>

                                                                   Exhibit 99.1

                          EXHIBIT 99.1 TO SCHEDULE 13G

                        IDENTIFICATION OF GENERAL PARTNER

     The general partner of Infrastructure and Environmental Private Equity
Fund III, L.P. ("IEPEF III"), and the investment manager of Environmental &
Information Technology Private Equity Fund III ("EITPEF"), is Infrastructure
and Environmental Private Equity Management III, LLC ("IEPEM"), whose
ultimate members are First Analysis Corporation ("FAC"), Bret R. Maxwell
("Maxwell"), Mark Koulogeorge ("Koulogeorge"), Argentum Management, LLC
("AM"), Argentum Investments, LLC ("AI"), Schneur Z. Genack, Inc. ("SZG"),
and RS Investment Management ("RSIM"). Only FAC, Koulogeorge and Maxwell take
executive action on behalf of IEPEM with respect to its functioning as
general partner of IEPEF III and investment manager of EITPEF.

     F. Oliver Nicklin ("Nicklin"), President and Director of FAC, and
Maxwell, Vice Chairman of FAC, take executive actions on behalf of FAC with
respect to FAC's functioning as an ultimate general partner of IEPEF III and
EITPEF. Each of Nicklin and Maxwell maintain his principal office at 233
South Wacker Drive, Suite 9500, Chicago, Illinois 60606 ("Suite 9500"). Each
of the above is principally employed as an executive of FAC. FAC's principal
business is participation in venture capital partnerships and the provision
of research investment services. Its principal business address is Suite 9500.

     Each of AM and AI maintains its business address c/o The Argentum Group
("TAG"), 405 Lexington Avenue, 54th Floor, New York, New York 10174 (the "TAG
Address"). SZG maintains its business address at 18 East 48th Street, Suite
1800, New York, New York 10017 (the "SZG Address"). The persons who take
actions on behalf of AM, AI and SZG with respect to their functioning as
members of IEPEM are Schneur Genack ("Genack"), Daniel Raynor ("Raynor") and
Walter H. Barandiaran ("Barandiaran"). Each of Raynor and Barandiaran is
principally employed as an executive of TAG and maintains his business
address at the TAG Address. TAG's principal business is merchant banking.
Genack is principally employed as a private investor and maintains his
business address at the SZG Address.

     The person who takes actions on behalf of RSIM with respect to its
functioning as a member of IEPEM is Hamilton, who is principally employed as
an executive of FAC. Hamilton does not take executive action on behalf of FAC
with respect to its functioning as an ultimate general partner of IEPEF III
and EITPEF. Hamilton maintains his principal business address at 6065 Shelter
Bay Avenue, Mill Valley, California 94941. RSIM's principal business is
investment banking.

     To the best of FAC's knowledge, each of the natural persons listed above
is a citizen of the United States, except for Barandiaran, who is a citizen
of Peru.


<PAGE>

                                                                   Exhibit 99.2

                           EXHIBIT 99.2 TO SCHEDULE 13G
                         17 C.F.R. 240.13d-1(k)(1)(iii)

Pursuant to Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, the
undersigned hereby agree that only one statement containing the information
required on Schedule 13G need be filed with respect to ownership by each of the
undersigned of shares of Common Stock of Modtech Holdings, Inc.

This Agreement may be executed in any number of counterparts, each of which
shall be deemed an original.

Dated: April 20, 2000

                         /s/ Charles A. Hamilton
                         -----------------------------------------------
                         CHARLES A. HAMILTON


                         INFRASTRUCTURE AND ENVIRONMENTAL PRIVATE EQUITY
                         FUND III, L.P., a Delaware Limited Partnership

                         By:  Infrastructure and Environmental Private Equity
                              Management III, LLC, its general partner

                         By:  First Analysis IEPEF Management Company III, LLC,
                              its managing member

                         By:  /s/ Bret R. Maxwell
                              ------------------------------------------------
                              Bret R. Maxwell, Managing Member


                         ENVIRONMENTAL & INFORMATION TECHNOLOGY PRIVATE EQUITY
                         FUND III, Gesellschaft burgarlichen Rechts (mit
                         Haftungsbeschankung), a civil partnership with
                         limitation of liability established under the laws of
                         the Federal Republic of Germany

                         By:  Infrastructure and Environmental Private Equity
                              Management III, L.L.C., its Investment Manager

                         By:  First Analysis IEPEF Management Company III, LLC,
                              its Managing Member


                         By:  /s/ Bret R. Maxwell
                              ------------------------------------------------
                              Bret R. Maxwell, Managing Member



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