HEMAGEN DIAGNOSTICS INC
POS AM, 2000-03-24
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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     As filed with the Securities and Exchange Commission on March 24, 2000
                                                     Registration No.  333-06147
- --------------------------------------------------------------------------------
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                         POST-EFFECTIVE AMENDMENT NO. 2
                                 ON FORM S-3 TO
                                    FORM SB-2

                             REGISTRATION STATEMENT
                                      Under
                           The Securities Act of 1933



                            HEMAGEN DIAGNOSTICS, INC.
             (Exact name of registrant as specified in its charter)


             Delaware                                           04-2869857
 (State or other jurisdiction of                              (IRS Employer
  incorporation or organization)                          Identification Number)

                            Hemagen Diagnostics, Inc.
                              34-40 Bear Hill Road
                          Waltham, Massachusetts 02451
                                 (781) 890-3766
              (Address of registrant's principal executive offices)


                              Gary P. Kreider, Esq.
                       Keating, Muething & Klekamp, P.L.L.
                           14th Floor, Provident Tower
                             One East Fourth Street
                             Cincinnati, Ohio 45202
                                 (513) 579-6411
                      (Name, address of agent for service)

Approximate  date of  commencement  of the  proposed  sale to the  public:  Upon
effectiveness of this Registration Statement.

If the only securities  being registered on this form are being offered pursuant
to dividend or interest reinvestment plans, please check the following box. [ ]

If any securities  being  registered on this form are to be offered on a delayed
or continuous basis pursuant to Rule 415 under the Securities Act of 1933, other
than   securities   offered  only  in  connection   with  dividend  or  interest
reinvestment plans, check the following box. [X]

If this Form is filed to register additional securities for an offering pursuant
to Rule 462(b) under the Securities Act, please check the following box and list
the  Securities  Act  registration  statement  number of the  earlier  effective
registration statement for the same offering. [ ] ______________

If this Form is a  post-effective  amendment filed pursuant to Rule 462(c) under
the  Securities  Act,  check  the  following  box and  list the  Securities  Act
registration  statement number of the earlier effective  registration  statement
for the same offering. [ ] _______________

If delivery  of the  prospectus  is  expected  to be made  pursuant to Rule 434,
please check the following box. [ ]

Pursuant to Rule 416, there are also being registered such additional  shares of
Common Stock as may become issuable  pursuant to antidilution  provisions of the
Private Placement Warrants and a Placement Agent Warrant.


<PAGE>



                                TABLE OF CONTENTS

                                                                            Page
                                                                            ----
PROSPECTUS SUMMARY.........................................................   2

RISK FACTORS...............................................................   2

USE OF PROCEEDS............................................................   5

SELLING SECURITYHOLDERS....................................................   5

PLAN OF DISTRIBUTION.......................................................   9

LEGAL MATTERS..............................................................  10

EXPERTS....................................................................  11

WHERE YOU CAN FIND MORE INFORMATION........................................  11

MISCELLANEOUS..............................................................  12




<PAGE>



PROSPECTUS

                            Hemagen Diagnostics, Inc.

This Prospectus covers the following transactions and securities:

     1.   Sales by the selling securityholders named herein of:

          -    Up to 2,695,255 shares of Common Stock.

          -    Up to 2,695,255  Common Stock Purchase  Warrants each exercisable
               for one share at an exercise price of $2.75 per share.

          -    Up to  2,695,255  shares  of Common  Stock to be issued  upon the
               exercise of  outstanding  Common  Stock  Purchase  Warrants at an
               exercise price of $2.75 per share.

     2.   Exercise  of  Common  Stock  Purchase Warrants at an exercise price of
$2.75 per share by persons other than the selling securityholders.

     Hemagen  will  not  receive  any   proceeds   from  sales  by  the  selling
securityholders.  Hemagen will receive all the net proceeds from the exercise of
the Warrants, namely, $7,411,951.

     Hemagen's  Common Stock is traded in the Nasdaq  SmallCap Market and on the
Boston Stock  Exchange  under the symbols  "HMGN" and "HGN,"  respectively.  The
Warrants are traded in the Nasdaq  SmallCap  Market under the symbol "HMGNW." On
March 17, 2000 the last reported sale price of Hemagen's Common Stock was $3-5/8
per share and $1-1/4 per Warrant.

     The securities offered pursuant to this Prospectus involve a high degree of
risk. See "Risk Factors" beginning at page 3.

     Neither the  Securities  and Exchange  Commission  or any state  securities
commission has approved or disapproved  of these  securities or determined  that
this Prospectus is truthful or complete. Any representation to the contrary is a
criminal offense.











                 The date of this Prospectus is March __, 2000.


<PAGE>


                               PROSPECTUS SUMMARY


     This Prospectus  relates to Common Stock and Common Stock Purchase Warrants
of Hemagen Diagnostics, Inc., a Delaware corporation.

     We issued  2,695,255  shares of Common  Stock  and  2,695,255  Warrants  to
purchase  2,695,255  shares of Common  Stock at $2.75 per share in a March  1996
private  placement.  We registered  the Shares and Warrants and shares  issuable
upon exercise of the Warrants for resale in 1996. An undetermined number of such
Shares  and  Warrants  have been  resold  pursuant  to that  registration.  This
Prospectus  covers the continued resale of those securities by those persons who
acquired  them through the 1996  private  offering.  The 1996 private  placement
purchasers are identified as selling  securityholders in this Prospectus and are
named starting on page .

     This  Prospectus  also covers the exercise of outstanding  Warrants held by
persons other than the selling securityholders who purchased in the 1996 private
offering.

     Hemagen will not receive any proceeds from this  offering  other than up to
$7,411,951 upon exercise of the Warrants.

     Hemagen's address is 34-40 Bear Hill Road, Waltham, Massachusetts 02154 and
our telephone number is 1-800-436-2436.

                                  RISK FACTORS

     An  investment  in  our  Common  Stock  and  Warrants  offered  under  this
prospectus  involves a high  degree of risk.  The  following  risk  factors,  in
addition  to the  other  information  contained  in this  prospectus,  should be
considered carefully in evaluating us and our business.

The Report of Our Independent Accountants States That There Is Substantial Doubt
as to Our Ability to Continue as a Going Concern.

     Our consolidated financial statements [(as set forth in Annex A)] have been
presented on the basis that Hemagen is a going  concern which  contemplates  the
realization of assets and the  satisfaction  of liabilities in the normal course
of business. We incurred a net loss of $5,160,355 in fiscal 1999 and our working
capital  decreased  from  $871,796 at September 30, 1999 to $220,000 at December
31, 1999. In addition,  as of February 7, 2000, we were not in  compliance,  and
continue to not be in compliance,  with certain  covenants of our revolving line
of credit  agreement  with a bank under which we had borrowings of $4,057,500 as
of such date.  If we fail to meet our goals with regard to cost  reductions  and
improved  operations,  our ability to continue as a going concern may be further
jeopardized.

Because Our Stock Price May Be Volatile,
the Shares You Purchase May Lose Their Value Rapidly

     The market  price of our common  stock has been,  and may  continue  to be,
highly volatile.  This price has ranged between $0.75 and $6.00 in the fifty-two
week  period  ending  March 17,  2000.  The stock  market  has from time to time



                                       2
<PAGE>


experienced  extreme  price  and  volume   fluctuations,   particularly  in  the
biotechnology   sector,  which  have  often  been  unrelated  to  the  operating
performance  of  particular   companies.   Factors  such  as   announcements  of
technological  innovations or new products by our  competitors or  disappointing
results by third  parties,  as well as market  conditions in our  industry,  may
significantly impact the market price of our common stock.

We Need Additional Financing

     We had cash and cash  equivalents on hand of $415,076 at December 31, 1999.
We are in default of the financial covenants of our $3.8 million loan from Fleet
National  Bank.  We have  secured  an  agreement  from  that  bank  to  forebear
exercising  its  remedies  until March 31,  2000,  so long as no other  defaults
occur. We are in the process of raising additional capital through a convertible
secured note  offering of $4 million.  We believe we will be able to  consummate
this  offering by March 31, 2000 and utilize the  proceeds to pay the bank debt.
However, there is no assurance that this plan will be successful.

     In  addition,  we will  require  additional  funds to finance  our  planned
operations for fiscal 2000. If we are unable to raise  additional  equity and/or
borrow  additional  funds,  we may not be able to execute our business  plan and
continue operations.

Our Industry is Highly Competitive

     We operate in the highly  competitive  clinical  diagnostics field. We have
historically  focused on niche markets which we believe offer significant growth
potential and limited competition.  However, we compete, and will compete in the
future, with numerous other companies,  many of which have substantially greater
financial, technical and managerial resources than we do.

We May Lose Our Proprietary Rights

     We protect our  proprietary  technology  primarily as trade secrets  rather
than by relying on patents,  either because patent protection is not possible or
because,  in our  opinion,  patent  protection  would  be  less  effective  than
maintaining  secrecy.  Also,  we rely on  confidentiality  agreements  with  our
employees.  Our efforts to maintain secrecy through  confidentiality  agreements
and trade secret protection may be unsuccessful.

If We Are Unable to Retain Our Key Personnel,
We May Be Unable to Achieve Our Developmental Objectives

     Our success depends,  in large part, upon our ability to attract and retain
a highly qualified  scientific and management team. The loss of key personnel or
the failure to recruit the necessary additional personnel needed for a qualified
team might impede the  achievement of our  objectives.  We face  competition for
qualified  personnel from other companies,  research and academic  institutions,
government entities and other organizations.  We may not be successful in hiring
or retaining qualified  scientific or management  personnel on acceptable terms,
given the competition among numerous diagnostics companies.


                                       3
<PAGE>


If We Are Sued for Product Related Liabilities,
the Cost Could Be Prohibitive to Us

     The testing,  marketing  and sale of human  healthcare  products  entail an
inherent  exposure to product  liability,  and third  parties  may  successfully
assert product liability claims against us. Although we currently have insurance
covering  our  products,  we may not be  able  to  maintain  this  insurance  at
acceptable costs in the future, if at all. In addition, our insurance may not be
sufficient to cover large claims.  Significant  product  liability  claims could
result in large  and  unexpected  expenses  as well as a costly  distraction  of
management resources and potential negative publicity and reduced demand for our
product.

Our Activities Involve the Use of Hazardous Materials, and
We May Be Held Liable for Any Accidental Injury from These Hazardous Materials

     Our research  and  development  activities  involve the  controlled  use of
hazardous materials,  including radioactive compounds.  Although we believe that
our safety  procedures  for handling and  disposing of our  hazardous  materials
comply  with the  standards  prescribed  by  federal,  state and local  laws and
regulations, the risk of accidental contamination or injury from these materials
cannot be completely  eliminated.  In the event of an accident, we could be held
liable for damages that result and  significant  and unexpected  costs including
costs  relating to  liabilities  and clean-up,  costs from  increased  insurance
premiums or liability  to obtain  adequate  insurance at a reasonable  price and
costs from loss of operations during clean-up.

We are Subject to Extensive Government Regulation

     Our  manufacturing  and  marketing of  diagnostic  test kits are subject to
government  regulation  in the United  States and the other  countries  where we
market  our  products.  The  process  of  requesting  and  obtaining  regulatory
approvals  involves lengthy and detailed  laboratory and clinical  testing,  and
other  costly  and  time-consuming   procedures.   The  extent  of  governmental
regulation  which may arise from future  legislative  or  administrative  action
cannot be predicted.

Our Common Stock May Be Delisted from the Nasdaq Small Cap Market,
Which Would Make it More Difficult for You to Sell Shares

     Our  common  stock is listed on the  Nasdaq  SmallCap  Market.  In order to
continue  to  be  listed  on  Nasdaq,  however,  we  must  comply  with  certain
maintenance  standards.  In the event of a delisting,  an investor could find it
more difficult to dispose of or to obtain  accurate  quotations as to the market
value of our common stock.

     In addition,  if our common stock were to become  delisted  from trading on
Nasdaq,  our common stock could be  considered a penny  stock.  SEC  regulations
generally  define a penny stock to be an equity  security  that is not listed on
Nasdaq or a national  securities  exchange  and that has a market  value of less
than $5.00 per share, subject to certain exceptions.  The SEC regulations impose
strict requirements on broker-dealers executing transactions in penny stocks. If
our  common  stock is no longer  traded on Nasdaq  and  becomes  subject  to the
regulations applicable to penny stocks,  investors may find it more difficult to
obtain timely and accurate quotes and execute trades in our common stock.



                                       4
<PAGE>


We Have Not Paid, and Do Not Expect to Pay, Dividends on Our Common Stock

     We have not paid  dividends on our common stock since our  inception and do
not intend to pay any dividends to our  stockholders in the foreseeable  future.
We intend to reinvest  any  earnings in the  development  and  expansion  of our
business.

                                 USE OF PROCEEDS

     We will receive  $7,411,951 if all of the Warrants are  exercised.  We will
utilize these proceeds as received for general working capital purposes.

                             SELLING SECURITYHOLDERS

     The  following is a list of the persons who  purchased our Common Stock and
Warrants in the 1996 private  placement along with the number of shares acquired
by them  represented by outstanding  shares and shares issuable upon exercise of
their  Warrants.  We believe  that many of these  persons have sold their Common
Stock and Warrants pursuant to a registered  secondary offering.  We do not know
how many of these  persons  still hold these  securities,  but to the extent the
persons  listed own those  securities  or  acquired  Common  Stock  through  the
exercise of Warrants purchased in the 1996 private placement,  such Warrants and
Common Stock may be publicly sold pursuant to this Prospectus.


                                                                       Number of
                                                                      Shares and
                                Name                                   Warrants
- --------------------------------------------------------------------- ----------
Ando International, Inc.                                                 727,272
Haussmann Holdings                                                       680,000
Laurentian Special Equity Fund                                           360,000
One & Co.                                                                336,000
Essex High Tech Fund LP                                                  270,000
The New Discovery Fund                                                   230,000
The Fisher Fund                                                          220,000
Eugene Melnyk                                                            181,820
Apollo Medical Partners                                                  150,000
Okura & Co. (America), Inc.                                              145,454
Gary Davis                                                               131,256
Barry M. Manuel                                                          120,000


                                       5
<PAGE>


Jesup and Lamont Securities Corp.                                        111,064
Ville de Montreal                                                        100,000
U.S. Technology                                                          100,000
Virginia Guilder                                                          90,000
Joseph D. Cooper and Carol J. Cooper, JTWROS                              80,000
Wind River Partners LP                                                    80,000
Jesup and Lamont Capital Markets, Inc.                                    73,278
Bradley Resources Company                                                 72,000
The John Merck Fund                                                       70,000
Money Purchase Pension Plan                                               60,000
Trust Pret et Revenu                                                      60,000
Lawrence G. Goldberg                                                      50,000
Hiro Yamagishi                                                            46,964
Lawrence Kobren                                                           46,000
G.W. Merck Trust Under Indenture f/b/o Serena M. Hatch                    44,000
Leib Merkin Inc.                                                          44,000
Family trust for Wife and Descendants of Thomas J. Berardino              40,000
Leonard J. Adams                                                          40,000
Robert K. Fuchs                                                           40,000
Wayne Saker                                                               40,000
Louis A. Saporito, Jr.                                                    40,000
Alan Vogel and Susan Faits, JTWROS                                        40,000
IHG Limited Profit Sharing Plan                                           37,600
John M. Curry                                                             36,364
Howard Caral                                                              35,000
Reuben F. Richards, Jr.                                                   35,000
Guy F. Bernheim                                                           20,000


                                       6
<PAGE>


Robert E. Briefel                                                         20,000
Dwight M. Evans                                                           20,000
Anthony Ferro                                                             20,000
Charles Fischer                                                           20,000
Generic Trading Associates, LLC                                           20,000
Michael Kubin and Nicole Kubin, JTWROS                                    20,000
Claude Lemire                                                             20,000
Michael I. Michael and Venetia Michael, JTWROS                            20,000
Donald G. Prigmore                                                        20,000
Louis I. Meisel                                                           20,000
Deborah L. Shear                                                          20,000
Elliott Stagnari                                                          20,000
George W.M. Hatch                                                         20,000
Stanley Zaslow                                                            20,000
Fonds Desjardins - Croissance                                             20,000
Ronald Brown and Beverly J. Brown, JTWROS                                 20,000
Nathan Roseman and Susan Roseman, JTWROS                                  20,000
Marshall Kaplan and Marsha Kaplan, JTWROS                                 20,000
Steven G. Cooperman, M.D.                                                 20,000
Mitchell J. Held                                                          20,000
Leader Financial Corporation                                              20,000
Francis W. Hatch                                                          20,000
Serena M. Hatch                                                           20,000
Marjory K. Hatch                                                          20,000
Fonds Commun Canagex - Actions Canadiennes Cruissance                     20,000
Serena H. Whitridge                                                       16,000
Timothy Brody                                                             15,000
Ron Furman                                                                15,000


                                       7
<PAGE>


Brett Uarusi                                                              15,000
James E. Forrest                                                          12,000
North Star Assoc., #1                                                     12,000
Robert L. Leeds, III                                                      11,000
Spencer Trask Securities Inc.                                             10,200
Arbor Interiors Pension Fund                                              10,000
James J. Baldino & Roseanne M. Baldino, JTWROS                            10,000
Sol J. Barer                                                              10,000
Howard Berke                                                              10,000
Frank J. Coppola and Barbara Ann Coppola, JTWROS                          10,000
Myron J. Elfland                                                          10,000
Peter Grabler                                                             10,000
Brent D. Holmes and Kathleen A. Holmes, JTWROS                            10,000
Andre W. Iseli                                                            10,000
Lewis J. Levine                                                           10,000
Robert P. McGovern                                                        10,000
Howard G. Schoor and Joan Schoor, JTWROS                                  10,000
Donald C. Weinberger                                                      10,000
Huyler C. Held                                                            10,000
Ville de Laval                                                            10,000
Ville de Jonquiere                                                        10,000
Spencer F. Segura                                                         10,000
E. Consulting                                                             10,000
Delaware Charter Guaranty and Trust, cust for IRA Robert Walker           10,000
Edward Yodowitz                                                           10,000
Konstantine Vaxevaneris                                                   10,000
Joseph M. Coppola and Margaret Coppola, JTWROS                            10,000



                                       8
<PAGE>


Douglas Spooner                                                            8,290
Samuel Gordon                                                              5,000
Susan Sweet                                                                5,000
Eileen Sena                                                                2,000


                              PLAN OF DISTRIBUTION

Sales by Selling Securityholders

     To  the  extent  described  in  this  Prospectus,  we are  registering  the
securities offered hereby on behalf of the Selling Securityholders.  The Selling
Securityholders  may sell or transfer all or a portion of the securities offered
hereby from time to time to third  parties  directly  or by or through  brokers,
dealers,  agents or  underwriters,  who may receive  compensation in the form of
underwriting   discounts,   concessions   or   commissions   from  the   Selling
Securityholders  and/or from  purchasers of the securities for whom they may act
as  agent.  However,  we are not aware  that any  Selling  Securityholders  have
entered  into  any  agreements,   understandings   or   arrangements   with  any
underwriters or broker-dealers  regarding the sale of their  securities,  nor is
there an  underwriter  or  coordinating  broker  acting in  connection  with the
proposed sales or transfers of securities by the Selling  Securityholders.  Such
sales and transfers of the  securities  may be effected from time to time in one
or more  transactions  on the Nasdaq  SmallCap  Market and,  with respect to the
Common Stock,  the Boston Stock Exchange,  in the  over-the-counter  market,  in
negotiated  transactions or otherwise,  at a fixed price or prices, which may be
changed,  at market prices prevailing at the time of sale, at negotiated prices,
or without  consideration,  through put or call options transactions relating to
the  securities,  through short sales of  securities  or a  combination  of such
methods of sale, or by any other legally  available  means.

     The term, "Selling Securityholders" includes donees, pledgees and assignees
in interest selling securities from the named Selling  Securityholders after the
date of this Prospectus. Any or all of the securities may be sold or transferred
from time to time by the Selling  Securityholders  by means of (a) a block trade
in which the broker or dealer so engaged will attempt to sell the  securities as
agent but may  position  and  resell a  portion  of the  block as  principal  to
facilitate the transaction; (b) purchases by a broker or dealer as principal and
resale by such broker or dealer for its account pursuant to this Prospectus; (c)
ordinary  brokerage  transactions  and transactions in which the broker solicits
purchasers;  (d) through the writing of options on the Common Stock; (e) pledges
as collateral to secure loans,  credit or other financing  arrangements  and any
subsequent   foreclosure,   if  any,  thereunder;   (f)  gifts,   donations  and
contributions;  and (g) any other  legally  available  means.  The aggregate net
proceeds to the Selling  Securityholders from the sale of the securities will be
the purchase price of such securities less any commissions.

     In  order  to  comply  with  the  securities  laws of  certain  states,  if
applicable,  the  securities  will be sold in such  jurisdictions  only  through
registered or licensed  brokers or dealers.  In addition,  in certain states the
securities  may not be sold unless they have been  registered  or qualified  for
sale  in  the  applicable  state  or  an  exemption  from  the  registration  or
qualification requirement is available and is complied with.

     The  Selling   Securityholders   and  any  brokers,   dealers,   agents  or
underwriters  that  participate  in the  distribution  of the  securities may be
deemed  to be  "underwriters"  within  the  meaning  of  Section  2(11)  of  the
Securities  Act,  in which  event any  discounts,  concessions  and  commissions
received by such brokers,  dealers, agents or underwriters and any profit on the



                                       9
<PAGE>


resale of the  securities  purchased  by them may be  deemed to be  underwriting
commissions  or  discounts  under  the  Securities  Act.   Because  the  Selling
Securityholders may be deemed to be "underwriters" within the meaning of Section
2(11) of the Securities Act, the Selling  Securityholders will be subject to the
prospectus  delivery  requirements  of the  Securities  Act,  which may  include
delivery through the facilities of the Nasdaq National Market. Additionally, the
anti-manipulative  provisions of Regulation M promulgated under the Exchange Act
may apply to sales by the Selling Securityholders in the market.

     No  underwriter,  broker,  dealer  or  agent  has  been  engaged  by  us in
connection with the distribution of the securities registered herein.

     Any securities  covered by this Prospectus  which qualify for sale pursuant
to Rule 144 under the  Securities  Act may be sold under  Rule 144  rather  than
pursuant  to  this   Prospectus.   There  is  no  assurance   that  the  Selling
Securityholders will sell any of the securities. The Selling Securityholders may
transfer, devise or gift securities by other means not described herein.

     We  will  pay  all of the  expenses  incident  to the  registration  of the
securities, other than underwriting discounts and selling commissions, if any.

     The Selling  Securityholders  may agree to indemnify  any agent,  dealer or
broker-dealer  that  participates in transactions  involving sales of securities
against certain liabilities, including liabilities under the Securities Act.

     If we are notified by Selling Securityholders that any material arrangement
has been entered into with a broker-dealer for the sale of securities  through a
block trade, special offering,  exchange distribution or secondary  distribution
or a  purchase  by a  broker  or  dealer,  we  will  file a  supplement  to this
prospectus,  if required,  pursuant to Rule 424(b) under the Securities Act. The
supplement will disclose (i) the name of each such selling  Securityholders  and
of the participating  broker-dealer(s),  (ii) the number of securities involved,
(iii) the price at which such  securities  will be sold, (iv) the commissions to
be paid or  discounts  or  concessions  to be allowed to such  broker-dealer(s),
where  applicable,   (v)  that  such   broker-dealer(s)   did  not  conduct  any
investigation  to verify the information set out or incorporated by reference in
this prospectus and (vi) other facts material to the  transaction.  A supplement
to this  prospectus  will be filed if the  Company is  notified  by the  Selling
Securityholders  that a donee or pledgee intends to sell more than 500 of any of
the securities.

Exercise of Warrants

     Holders of Warrants may exercise them by surrendering  Warrant Certificates
to  Hemagen's  Transfer  Agent,  Continental  Stock  Transfer  & Trust  Company,
Compliance Department,  2 Broadway, New York, New York 10004 with a subscription
on the reverse side of the Warrant Certificate completed and executed,  together
with  payment of the  exercise  price of $2.75 per share.  The  Warrants  may be
exercised  at any time,  in whole or in part,  until the  close of  business  on
February 28, 2001.

                                  LEGAL MATTERS

     The  legality  of the  securities  offered  hereby  will be passed upon for
Hemagen by Keating, Muething & Klekamp, P.L.L., Cincinnati, Ohio.



                                       10
<PAGE>



                                    EXPERTS

     The financial statements  incorporated by reference in this Prospectus have
been audited by BDO Seidman, LLP, independent  certified public accountants,  to
the extent and for the  periods  set forth in their  report  (which  contains an
explanatory  paragraph  regarding the  Company's  ability to continue as a going
concern)  incorporated  herein  by  reference,  and are  incorporated  herein in
reliance  upon such report  given upon the  authority of said firm as experts in
auditing and accounting.

                       WHERE YOU CAN FIND MORE INFORMATION

     We file annual,  quarterly and special reports,  proxy statements and other
information with the SEC. You may also read and copy any document we file at the
SEC's public reference room at 450 Fifth Street, N.W.,  Washington,  D.C. 20549.
Please  call the SEC at  1-800-SEC-0330  for further  information  on the public
reference  rooms.  Our SEC filings are available to the public over the internet
at the SEC's web site at http://www.sec.gov.

     The SEC allows us to  "incorporate  by reference"  the  information we file
with  them.  This  Prospectus  incorporates  important  business  and  financial
information  about  Cintas  which is not  included  in or  delivered  with  this
Prospectus.  The  information  incorporated by reference is an important part of
this  Prospectus,  and  information  that  we  file  later  with  the  SEC  will
automatically update and supersede this information. We incorporate by reference
the Quarterly  Report on Form 10-Q for the quarter ended  December 31, 1999, the
Annual Report on Form 10-K, as amended,  for the year ended  September 30, 1999,
the Form 8-K/A filed  October 14, 1999 and any future  filings made with the SEC
under Sections 13(a),  13(c), 14 or 15(d) of the Securities Exchange Act of 1934
prior to the termination of this offering.  We also incorporate by reference our
Registration  Statement on Form 8-A filed on February 2, 1993,  registering  the
Company's  Common Stock under the Exchange Act, which describes the Common Stock
being registered by this Prospectus.

     You may  obtain a copy of these  filings  without  charge,  by  writing  or
telephoning us at the following address:

                          William P. Hales
                          President
                          Hemagen Diagnostics, Inc.
                          34-40 Bear Hill Road
                          Waltham, Massachusetts  02154
                          (800) 436-2436

     You  should  rely only on the  information  incorporated  by  reference  or
provided in this Prospectus.  We have not authorized  anyone else to provide you
with different  information.  We are not making an offer of these  securities in
any state  where the offer is not  permitted.  You should  not  assume  that the
information in this Prospectus is accurate as of any date other than the date on
the front of those  documents.  If you would like to request  documents from us,
please  do so by five  business  days  before  you  have  to make an  investment
decision.

     Certain statements contained in this Prospectus and in reports that we file
with  the  SEC  that  are  not  historical  facts   constitute   forward-looking
statements,  within the meaning of the Private Securities  Litigation Reform Act
of 1995, and are intended to be covered by the safe harbors created by that Act.
Reliance should not be placed on forward-looking statements because they involve


                                       11
<PAGE>


known and unknown  risks,  uncertainties  and other factors  including,  without
limitation, those contained in this Risk Factors section, which may cause actual
results,  performance or achievements to differ  materially from those expressed
or implied.  Any  forward-looking  statement speaks only as of the date made. We
undertake no  obligation  to update any  forward-looking  statements  to reflect
events or circumstances after the date on which they are made.

                                  MISCELLANEOUS

     No  person  is  authorized  to  give  any   information   or  to  make  any
representations  other than those contained or incorporated by reference in this
Prospectus and, if given or made, such information or  representations  must not
be relied upon as having been authorized. This Prospectus does not constitute an
offer to sell or a solicitation of an offer to buy any securities other than the
registered  securities to which it relates or an offer to sell or a solicitation
of an offer to buy such securities in any  jurisdiction to any person to whom it
is unlawful to make such offer or solicitation in such jurisdiction. Neither the
delivery  of  this   Prospectus  nor  any  sale  hereunder   shall,   under  any
circumstances,  create  any  implication  that  there  has been no change in the
affairs  of  Hemagen  since the date  hereof or that the  information  herein is
correct as of any time subsequent to its date.


                                       12
<PAGE>

                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.   Other Expenses of Issuance and Distribution

     The Company expects to incur the following costs and expenses in connection
with the registration of the securities covered by this Prospectus:

        *Registration Fee.............................       $  8,434.31
        *Legal Fees...................................       $ 50,000.00
        *Accounting Fees..............................       $  5,000.00
        *Miscellaneous................................       $ 11,565.69
                                                             -----------
        *Total........................................       $ 75,000.00
                                                             ===========

- ------------------
  *Estimate


Item 15. Indemnification of Officers and Directors


     Delaware General Corporation Law, Section 102(b)(7),  enables a corporation
in its original  certificate of  incorporation  or an amendment  thereto validly
approved by  Securityholders to eliminate or limit personal liability of members
of its Board of Directors for violations of a director's fiduciary duty of care.
However,  the  elimination or limitation  shall not apply where there has been a
breach  of the  duty of  loyalty,  failure  to act in good  faith,  engaging  in
intentional  misconduct  or  knowingly  violating  a law,  paying a dividend  or
approving a stock  repurchase  which was deemed illegal or obtaining an improper
personal  benefit.  The  Company's  Certificate  of  Incorporation  includes the
following language:

     To the maximum  extent  permitted by Section  102(b)(7) of the General
     Corporation Law of Delaware,  a director of this Corporation shall not
     be personally  liable to the  Corporation or its  Securityholders  for
     monetary  damages for breach of fiduciary  duty as a director,  except
     for liability (i) for any breach of the director's  duty of loyalty to
     the Corporation or its Securityholders, (ii) for acts or omissions not
     in good faith or which  involve  intentional  misconduct  or a knowing
     violation  of law,  (iii) under  Section 174 of the  Delaware  General
     Corporation  Law, or (iv) for any transaction  from which the director
     derived an improper personal benefit.

     Delaware  General  Corporation  Law,  Section  145,  permits a  corporation
organized under Delaware law to indemnify directors and officers with respect to
any matter in which the director or officer  acted in good faith and in a manner
he reasonably  believed to be not opposed to the best  interests of the Company,
and, with respect to any criminal  action,  in which he had reasonable  cause to
believe his conduct was lawful.  The Bylaws of the Company include the following
provision:


                                       II-1
<PAGE>


          Reference  is made to  Section  145 and any other  relevant
          provisions of the General  Corporation  Law of the State of
          Delaware.  Particular  reference  is made to the  class  of
          persons,  hereinafter  called  "Indemnitees,"  who  may  be
          indemnified  by a  Delaware  corporation  pursuant  to  the
          provisions of such Section 145, namely,  any person, or the
          heirs, executors, or administrators of such person, who was
          or is a party  or is  threatened  to be made a party to any
          threatened,   pending  or  completed   action,   suit,   or
          proceeding,  whether civil,  criminal,  administrative,  or
          investigative, by reason of the fact that such person is or
          was  a  director,  officer,  employee,  or  agent  of  such
          corporation  or is or was  serving  at the  request of such
          corporation as a director,  officer,  employee, or agent of
          another corporation,  partnership, joint venture, trust, or
          other  enterprise.  The  Corporation  shall,  and is hereby
          obligated to, indemnify the Indemnitees,  and each of them,
          in each  and  every  situation  where  the  Corporation  is
          obligated  to make  such  indemnification  pursuant  to the
          aforesaid  statutory  provisions.   The  Corporation  shall
          indemnify  the  Indemnitees,  and each of them, in each and
          every  situation  where,  under  the  aforesaid   statutory
          provisions,  the  Corporation  is  not  obligated,  but  is
          nevertheless   permitted   or   empowered,   to  make  such
          indemnification,  it being understood  that,  before making
          such  indemnification with respect to any situation covered
          under this  sentence,  (i) the  Corporation  shall promptly
          make or cause to be made, by any of the methods referred to
          in Subsection (d) of such Section 145, a  determination  as
          to  whether  each  Indemnitee  acted in good faith and in a
          manner he reasonably  believed to be in, or not opposed to,
          the best interests of the Corporation,  and, in the case of
          any criminal action or proceeding,  had no reasonable cause
          to believe that his conduct was unlawful,  and (ii) that no
          such indemnification  shall be made unless it is determined
          that such Indemnitee acted in good faith and in a manner he
          reasonably  believed  to be in, or not opposed to, the best
          interests  of the  Corporation,  and,  in the  case  of any
          criminal action or proceeding,  had no reasonable  cause to
          believe that his conduct was unlawful.

Item 16. Exhibits
                                                                          Filing
Exhibit No.   Description of Exhibit                                      Status
                                                                          ------
3.1           Certificate of Incorporation.                                  A
3.2           Bylaws.                                                        A
4.1           Specimen Stock Certificate.                                    A
4.2           Warrant Agreement between the Company
              and Continental Stock Transfer & Trust Co.                     B
5             Opinion regarding Legality of Securities.                      B
10.1          Technology Purchase Agreement between
              Dr. de Oliveira and Dr. Lazzari and
              Seragen, Inc., dated April 15, 1983.                           A
10.2          Assignment and Assumption Agreement
              between the Company and Seragen, Inc.,
              dated September 12, 1985.                                      A



                                       II-2
<PAGE>

10.3          Product Development Agreement between
              the Company and Boston University,
              dated February 14, 1992.                                       A
10.4          License Agreement between the Company
              and Boston University, dated March 1992.                       A
10.5          Financial Assistance Agreement between
              the Company and Hemagen Diagnosticos,
              Comercio, Importacao e Exportacao Ltd.,
              dated July 31, 1991.                                           A
10.6*         1992 Stock Option Plan                                         A
10.7          Product Purchase Agreement between the
              Company and Olympus Corporation, dated
              February 24, 1989.                                             A
10.8          OEM Agreement between the Company and
              Sigma Diagnostics, Inc., dated May 11, 1992.                   A
10.9          Note issued by the Company to Boston
              University, dated December 15, 1985                            A
10.10         Letter Agreement between the Company and
              Antonio Lazzari, M.D., dated April 28, 1985.                   A
10.11         Lease between the Company and Philip
              Pagliazzo and Rose Pagliazzo, dated
              dated May 15, 1992.                                            A
10.12         Product  Development  Agreement  between
              the Company and Sigma A Diagnostics, Inc.,
              dated October 16, 1992.                                        A
10.13*        Revised Employment Agreement between the
              Company and Dr. de Oliveira.                                   A
10.14*        Revised Employment Agreement between the
              Company and Dr. Franzblau.                                     A
10.15         Description of the Company's lease for
              certain premises located in Waltham,
              Massachusetts.                                                 A
10.16         Lease for office space of Hemagen
              Diagnosticos, Comercio, Importaceo e
              Exportaceo, Ltd. ("HDC") in Sao Paulo,
              Brazil.                                                        A
10.17         Description of the Lease for office space
              of HDC in Sao Paulo, Brazil.                                   A
10.18         Equity Purchase Agreement between the
              Company and HDC, dated as of October 1, 1992.                  A
10.19         Form of Warrant issued in connection with
              the Bridge Loan and Statement of Registration
              Rights.                                                        A


                                      II-3
<PAGE>



10.20         Master Lease Agreement between the Company
              and Aberlyn Capital Management Limited
              Partnership, dated April 1, 1993.                              C
10.21         Product Development Agreement between the
              Company and Boehringher Mannheim GmbH,
              dated November 25, 1993.                                       D
10.22         Option Agreement between the Company and
              Boston University, dated October 15, 1993.                     D
10.23         Agreement between the Company and Carter-
              Wallace, Inc. dated December 22, 1994.                         E
10.24         License Assignment and License Agreement
              between the Company and Aberlyn Capital
              Management Limited Partnership dated
              December 30, 1994.                                             E
10.25         Settlement Agreement dated September 30, 1999.                 F
21            Subsidiaries of the Registrant.                                G
23            Consent of Independent Certified
              Public Accountants.                                            H
24            Power of Attorney (contained on signature page)                H

*Management compensatory contracts.

A.   Incorporated by reference to Registration Statement No. 33-52686-B.

B.   Incorporated by reference to Registration  Statement No. 333-06147 filed on
     June 17, 1996.

C.   Incorporated  by  reference  to the  Company's  Form 10-QSB for the quarter
     ended March 30, 1993.

D.   Incorporated  by reference to the Company's Form 10-KSB for the Fiscal Year
     ended September 30, 1994.

E.   Incorporated  by  reference  to the  Company's  Form 10-QSB for the quarter
     ended December 31, 1994.

F.   Incorporated  by  reference to the  Company's  Form 8-K filed on October 7,
     1999.

G.   Filed with the  Company's  Form 10-KSB for the Fiscal Year ended  September
     30, 1999.

H.   Filed herewith.

Item 17. Undertakings.

     (a)  The Registrant will:


                                      II-4
<PAGE>


          (1)  File, during any period in which it offers or sells securities, a
               post-effective   amendment  to  this  registration  statement  to
               include any  additional or changed  material  information  on the
               plan of distribution.

          (2)  For determining liability under the Securities Act of 1933, treat
               each post-effective  amendment as a new registration statement of
               the  securities  offered,  and the offering of the  securities at
               that time to be the initial bona fide offering.

          (3)  File a post-effective  amendment to remove from  registration any
               of the securities that remain unsold at the end of the offering.


     (b)  Insofar  as   indemnification   for  liabilities   arising  under  the
          Securities  Act of 1933 (the  "Act") may be  permitted  to  directors,
          officers and  controlling  persons of the  Registrant  pursuant to the
          foregoing  provisions,  or otherwise,  the Registrant has been advised
          that in the opinion of the  Securities  and Exchange  Commission  such
          indemnification  is against  public policy as expressed in the Act and
          is,  therefore,   unenforceable.   In  the  event  that  a  claim  for
          indemnification  of such  liabilities  (other  than the payment by the
          Registrant  of expenses  incurred  or paid by a  director,  officer or
          controlling  person of the Registrant in the successful defense of any
          action,  suit or proceeding) is asserted by such director,  officer or
          controlling person in connection with the securities being registered,
          the Registrant  will,  unless in the opinion of its counsel the matter
          has  been  settled  by  controlling  precedent,  submit  to a court of
          appropriate  jurisdiction the question whether such indemnification by
          it is  against  public  policy  as  expressed  in the Act and  will be
          governed by the final adjudication of such issue.

     (c)  The Registrant will:

          (1)  For determining any liability under the Securities Act, treat the
               information  omitted from the form of prospectus filed as part of
               this  registration  statement  in  reliance  upon  Rule  430A and
               contained in a form of prospectus  filed by the Registrant  under
               Rule  424(b)(1),  or (4), or 497(h) under the  Securities  Act as
               part of this registration statement as of the time the Commission
               declared it effective.

          (2)  For  determining  any liability  under the Securities  Act, treat
               each post-effective  amendment that contains a form of prospectus
               as a new registration statement for the securities offered in the
               registration  statement,  and that offering of the  securities at
               that time as the initial bona fide offering of those securities.



                                      II-5
<PAGE>



                                   SIGNATURES

     Pursuant to the  requirements of the Securities Act of 1933, the Registrant
has duly caused this  Post-Effective  Amendment to Registration  Statement to be
signed on its behalf by the undersigned, thereunto duly authorized, on March 24,
2000.

                                            HEMAGEN DIAGNOSTICS, INC.


                                            By:  /s/Jerry L. Ruyan
                                               ---------------------------------
                                               Jerry L. Ruyan,
                                               Chief Executive Officer

     Pursuant  to  the   requirements  of  the  Securities  Act  of  1933,  this
Post-Effective  Amendment  to  Registration  Statement  has been  signed  by the
following  persons in the  capacities  and on the dates  indicated.  The persons
whose names appear with an asterisk (*) below hereby designate Jerry L. Ruyan or
William P. Hales, or either of them, as  attorney-in-fact to sign all amendments
including any post-effective amendments to the Registration Statement as well as
any related registration statement (or amendment thereto) filed pursuant to Rule
462(b) promulgated under the Securities Act of 1933.

       Signature                         Title                         Date
       ---------                         -----                         ----

/s/Jerry L. Ruyan
- -----------------------------      CEO and Chairman of the        March 24, 2000
*Jerry L. Ruyan                    Board of Directors



/s/William P. Hales
- ----------------------------       President, Director            March 24, 2000
*William P. Hales


/s/ricardo M. de Oliveira
- ----------------------------       V. P. Research and
*Ricardo M. de Oliveira, M.D.      Development, Director          March 24, 2000


/s/Alan S. Cohen
- ----------------------------       Director                       March 24, 2000
*Alan S. Cohen, M.D.


/s/Thomas A. Donelan
- ----------------------------       Director                       March 24, 2000
*Thomas A. Donelan


/s/Christoher P. Hendy
- ----------------------------       Director                       March 24, 2000
*Christopher P. Hendy


/s/Deborah F. Ricci
- ----------------------------      Chief Financial Officer         March 24, 2000
*Deborah F. Ricci



                                      II-6
<PAGE>




               CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS




Hemagen Diagnostics, Inc.


     We hereby  consent to the  incorporation  by  reference  in the  Prospectus
constituting a part of this Registration  Statement of our report dated December
2,  1999  relating  to  the   consolidated   financial   statements  of  Hemagen
Diagnostics,  Inc.  appearing in the Company's  Annual Report on Form 10-KSB for
the year ended September 30, 1999. Our report contains an explanatory  paragraph
regarding the Company's ability to continue as a going concern.

     We also consent to the  reference to us under the caption  "Experts" in the
Prospectus.



                                    BDO Seidman, LLP

Boston, Massachusetts
March 24, 2000




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