CYANOTECH CORP
424B1, 1996-03-22
MEDICINAL CHEMICALS & BOTANICAL PRODUCTS
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<PAGE>
   
                                                FILED PURSUANT TO RULE 424(b)(1)
                                                              FILE NO. 333-00951
    
 
   
                                1,500,000 SHARES
    
 
                                 [COMPANY LOGO]
                            ------------------------
 
                             CYANOTECH CORPORATION
 
                                  COMMON STOCK
 
   
    All  1,500,000  shares of  Common  Stock offered  hereby  are being  sold by
Cyanotech Corporation ("Cyanotech" or the "Company"). The Company's Common Stock
is currently traded on  the Nasdaq National Market  under the symbol "CYAN."  On
March  21, 1996, the last reported sale price  of the Common Stock on the Nasdaq
National Market was  $7 3/4  per share.  See "Price  Range of  Common Stock  and
Dividend Policy."
    
                            ------------------------
 
           THE COMMON STOCK OFFERED HEREBY INVOLVES A HIGH DEGREE OF
       RISK. SEE "RISK FACTORS" COMMENCING ON PAGE 5 OF THIS PROSPECTUS.
                             ---------------------
THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND
    EXCHANGE  COMMISSION OR ANY  STATE SECURITIES COMMISSION  NOR HAS THE
       SECURITIES AND EXCHANGE  COMMISSION OR  ANY STATE  SECURITIES
            COMMISSION  PASSED UPON THE  ACCURACY OR ADEQUACY OF
                THIS PROSPECTUS. ANY REPRESENTATION TO  THE
                           CONTRARY IS A CRIMINAL OFFENSE.
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
   
<TABLE>
<S>                                <C>                       <C>                       <C>
                                           PRICE TO                UNDERWRITING              PROCEEDS TO
                                            PUBLIC                 DISCOUNT (1)              COMPANY (2)
- ---------------------------------------------------------------------------------------------------------------
Per Share........................           $7.00                     $0.51                     $6.49
- -------------------------------------------------------------------------------------------
Total (3)........................        $10,500,000                 $765,000                 $9,735,000
</TABLE>
    
 
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
(1)  Does not include a non-accountable expense allowance payable by the Company
    to  the  Representative   of  the  Underwriters.   See  "Underwriting"   for
    indemnification arrangements with the several Underwriters.
 
(2)  Before deducting  expenses payable  by the  Company estimated  at $495,000,
    including the Representative's non-accountable expense allowance.
 
   
(3) The Company has granted to the  Underwriters a 30-day option to purchase  up
    to   225,000   additional   shares   of  Common   Stock   solely   to  cover
    over-allotments, if any. If the  Underwriters exercise this option in  full,
    the Price to Public will total $12,075,000, Underwriting Discount will total
    $879,750   and  the  Proceeds   to  Company  will   total  $11,195,250.  See
    "Underwriting."
    
 
   
    The shares of  Common Stock are  offered by the  several Underwriters  named
herein  subject to receipt and acceptance by  them and subject to their right to
reject any  order in  whole or  in part.  It is  expected that  delivery of  the
certificates  representing such shares will be  made against payment therefor at
the office of Van Kasper & Company, San Francisco, California on or about  March
27, 1996.
    
 
   
                              VAN KASPER & COMPANY
    
<PAGE>
   
                                 MARCH 21, 1996
    
<PAGE>
<PAGE>
CYANOTECH DEVELOPS AND COMMERCIALIZES NATURAL
PRODUCTS FROM MICROALGAE, A LARGELY UNEXPLORED AND UNEXPLOITED
RENEWABLE NATURAL RESOURCE
 
    SPIRULINA  is a  naturally occurring  multi-cellular microscopic  plant that
grows extremely fast, producing a new crop approximately every week. The Company
has developed  and  produces  a  unique strain  of  this  microalgae,  SPIRULINA
PACIFICA,  which is a vegetable-based, highly  absorbable source of natural beta
carotene,  mixed  carotenoids  and  other  phytonutrients,  B  vitamins,   gamma
linolenic  acid, protein and  essential amino acids.  SPIRULINA PACIFICA is sold
world-wide to the health and natural foods market.
 
    [Photograph of Spirulina cells]
 
    ASTAXANTHIN is a red pigment used  primarily in the aquaculture industry  to
impart  pink color to  the flesh of  pen-raised fish and  shrimp. The Company is
currently conducting  pilot  production  work  and  feeding  trials  on  natural
astaxanthin  derived  from the  HAEMATOCOCCUSS microalgae,  and is  discussing a
strategic alliance with a major aquaculture feed formulator.
 
    [Photograph of haematococcuss cells containing astaxanthin]
 
    MOSQUITOCIDE PRODUCTS   are currently  under development  by Cyanotech.  The
toxin   gene  from  BACILLUS  THURINGINSIS   VAR,  ISRAELENSIS  (Bti)  has  been
genetically engineered into SYNECHOCOCCUS,  a blue green algae  which is a  food
for   mosquito   larvae.  The   Company  believes   that   when  applied   to  a
mosquito-infested body  of  water, the  algae  could  act as  an  effective  and
environmentally  safe means of  control. Development of  a commercial production
system for this product is scheduled to start by mid-1996.
 
    [Photograph of Syneochoccus cells]
 
                            ------------------------
 
IN CONNECTION  WITH THIS  OFFERING, THE  UNDERWRITERS MAY  OVER-ALLOT OR  EFFECT
TRANSACTIONS WHICH STABILIZE OR MAINTAIN THE MARKET PRICE OF THE COMMON STOCK OF
THE  COMPANY AT  A LEVEL ABOVE  THAT WHICH  MIGHT OTHERWISE PREVAIL  IN THE OPEN
MARKET. SUCH  TRANSACTIONS MAY  BE EFFECTED  IN THE  OVER-THE-COUNTER MARKET  OR
OTHERWISE. SUCH STABILIZING, IF COMMENCED, MAY BE DISCONTINUED AT ANY TIME.
 
                                       2
<PAGE>
    Cyanotech   has  developed   and  implemented   proprietary  production  and
harvesting technologies, systems and processes permitting year-round  production
of SPIRULINA PACIFICA.
 
1. GROWING PONDS
 
    SPIRULINA  PACIFICA  is  cultured in  shallow,  open ponds  adjacent  to the
Pacific Ocean. Paddlewheels agitate the  water, permitting even exposure of  the
algae  to the  sun. A  combination of fresh  water and  nutrient-rich deep ocean
water, drawn from a depth of 2,000 feet, is used to fill the ponds.
 
    [Photograph of Spirulina growing ponds]
 
2. SEPARATION SCREENS
 
    SPIRULINA PACIFICA  is pumped  from the  culture ponds  through  underground
pipes to a process building where it is screened for particulate matter and then
separated  by stainless steel  screens from the culture  medium. In this system,
100% of the growing  media is continuously recycled  to culture ponds to  become
the nutrient base for the next crop.
 
    [Photograph  of  stainless steel  screens used  in processing  the Company's
Spirulina products]
 
3. VACUUM WASHING SYSTEM
 
    Prior to drying, SPIRULINA PACIFICA is  washed three times with fresh  water
and vacuum filtered.
 
    [Photograph  of  vacuum  washing  system used  in  processing  the Company's
Spirulina products.]
 
4. OCEAN CHILL DRYING (U.S. PATENT 15,276,977)
 
    Cyanotech has developed and patented  a drying system for powder  microalgae
products called OCEAN CHILL DRYING. The drying process takes approximately three
seconds and results in a dark green powder with a consistency similar to flour.
 
    [Drawing depicting the Company's Ocean Chill Drying process]
 
5. FINISHED PRODUCT
 
    Bulk  SPIRULINA PACIFICA  powder, tablets  and flakes  are packaged  in foil
laminate heat-sealed bags with an oxygen absorbing pack sealed in each bag. This
packaging ensures product freshness and extends the shelf life of bulk SPIRULINA
PACIFICA.
 
    [Photograph of finished powder packaging]
 
6. COLD COMPRESSION TABLETING
 
    SPIRULINA PACIFICA tablets are produced  by Cyanotech by blending  SPIRULINA
PACIFICA  powder with  a minimum  amount of excipients  and tableting  in a cold
compression tablet making machine.
 
    [Photograph of cold compression tablet-making machine]
 
7. QUALITY ASSURANCE TESTING
 
    A sample  from  each lot  of  SPIRULINA  PACIFICA is  subjected  to  quality
assurance  testing including  bulk density, moisture,  particulate matter, color
and taste and subjected  to a prescribed set  of microbiological tests for  food
products.
 
    [Photograph of Quality Assurance Testing Process]
<PAGE>
                               PROSPECTUS SUMMARY
 
    THE  FOLLOWING SUMMARY  IS QUALIFIED  IN ITS  ENTIRETY BY  THE MORE DETAILED
INFORMATION, INCLUDING "RISK FACTORS" AND THE CONSOLIDATED FINANCIAL  STATEMENTS
AND  NOTES THERETO, APPEARING ELSEWHERE IN  THIS PROSPECTUS. EXCEPT AS OTHERWISE
NOTED AND  UNLESS  THE CONTEXT  INDICATES  OTHERWISE, ALL  INFORMATION  IN  THIS
PROSPECTUS  ASSUMES (I) NO  EXERCISE OF THE  UNDERWRITERS' OVER-ALLOTMENT OPTION
AND (II) CONVERSION  OF THE  COMPANY'S 1,250,000  SHARES OF  SERIES A  PREFERRED
STOCK  INTO 250,000 SHARES OF COMMON STOCK,  EFFECTIVE AS OF THE CLOSING OF THIS
OFFERING. SEE "UNDERWRITING."
 
                                  THE COMPANY
 
    Cyanotech develops and commercializes natural products from microalgae.  The
Company   is  currently  producing  microalgae   products  for  the  nutritional
supplement  and  immunological  diagnostics  markets  and  is  also   developing
microalgae-based  products for  the aquaculture  feed/pigments, biopesticide and
food coloring markets. Microalgae are a diverse group of over 30,000 species  of
microscopic  plants which  have a  wide range  of physiological  and biochemical
characteristics and  naturally  contain  high levels  of  nutrients.  Microalgae
represent a largely unexplored and unexploited renewable natural resource, which
grow  much faster  than land-based  plants. Under  favorable growing conditions,
certain microalgae  produce  a new  crop  every week.  Cyanotech  has  designed,
developed  and implemented  proprietary production  and harvesting technologies,
systems and processes which  eliminate many of  the stability and  contamination
problems  frequently encountered in the  production of microalgae. The Company's
technologies,  systems,  processes   and  favorable   growing  location   permit
year-round harvesting of its microalgal products in a cost-effective manner. The
Company  believes that these accomplishments have  not been equaled by any other
company, university or research institute.
 
    Cyanotech's principal revenues  are derived from  sales of  microalgae-based
"Spirulina" products for the vitamin and supplement market, which for the United
States alone is estimated at $3.7 billion. SPIRULINA PACIFICA is a unique strain
of  Spirulina developed  by Cyanotech  which provides  a vegetable-based, highly
absorbable  source  of  natural  beta  carotene,  mixed  carotenoids  and  other
phytonutrients,  B vitamins, gamma linolenic acid ("GLA"), protein and essential
amino acids. The Company believes  its Hawaiian SPIRULINA PACIFICA has  achieved
high  brand identity  among both  wholesale and  retail customers,  and that the
Company's  products  have  better  taste,  more  consistent  color  and  greater
concentrations of natural beta carotene than competing Spirulina products. Since
1993,  the  Company  has been  capacity-constrained,  with demand  for  its bulk
SPIRULINA PACIFICA products exceeding the Company's production capabilities. The
Company has tripled its Spirulina  production capacity since 1993 and  continues
to  increase capacity.  Cyanotech currently markets  its products  in the United
States and twelve other  countries through a  combination of retail,  wholesale,
and  private label channels, and plans to market new products either directly or
through strategic alliances where appropriate.
 
    Cyanotech  maintains  an  environmentally  responsible  philosophy  in   the
development and production of its products, using natural production methods and
resources  which employ extensive recycling of  raw materials and nutrients. The
Company believes  that these  recycling methods  result in  substantially  lower
operating  costs. The  Company's production system  operates without  the use of
pesticides and herbicides,  and does  not create erosion,  fertilizer runoff  or
water pollution. The Company believes that it is the only producer of microalgae
to receive organic certification.
 
   
    The  Company is incorporated in Nevada.  Its principal executive offices are
located at 73-4460 Queen Kaahumanu  Hwy., Suite 102, Kailua-Kona, Hawaii  96740,
and  its telephone  number is  (808) 326-1353.  Unless otherwise  indicated, all
references in  this  Prospectus  to  the  "Company"  and  "Cyanotech"  refer  to
Cyanotech  Corporation, a Nevada  corporation, and its  wholly owned subsidiary,
Nutrex, Inc.
    
 
                            ------------------------
 
    SPIRULINA PACIFICA-TM-, OCEAN-CHILL  DRYING-TM-, HAWAIIAN ENERGIZER-TM-  and
NUTREX-TM-  are trademarks  of the Company.  SPIRULINA PACIFICA  is a registered
trademark of the Company in Japan.  The SPIRULINA PACIFICA logo is a  registered
trademark  of the  Company in the  United States. This  Prospectus also includes
trademarks of entities other than the Company.
 
                                       3
<PAGE>
                                  THE OFFERING
 
<TABLE>
<S>                                            <C>
Common Stock offered by the Company..........  1,500,000 shares
Common Stock to be outstanding after the
 offering....................................  15,232,460 shares (1)
Use of proceeds..............................  Construction of additional Spirulina  culture
                                               ponds,   a  natural   astaxanthin  production
                                               facility and culture ponds, a
                                               laboratory/warehouse   and   a   cogeneration
                                               facility, and for working capital and general
                                               corporate purposes
Nasdaq symbol................................  CYAN
</TABLE>
 
               SUMMARY CONSOLIDATED FINANCIAL AND OPERATING DATA
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
 
<TABLE>
<CAPTION>
                                                          YEAR ENDED MARCH 31,   NINE MONTHS ENDED
                                                                                    DECEMBER 31,
                                                          --------------------  --------------------
                                                            1994       1995       1994       1995
                                                          ---------  ---------  ---------  ---------
CONSOLIDATED STATEMENT OF INCOME DATA:
<S>                                                       <C>        <C>        <C>        <C>
Net sales...............................................  $   2,697  $   4,150  $   2,921  $   5,972
Gross profit............................................      1,202      1,875      1,339      3,188
Income from operations..................................        220        718        534      1,781
Net income..............................................        204        769        503      1,729
Net income per common share.............................  $    0.02  $    0.05  $    0.04  $    0.12
Weighted average number of common shares and common
 share equivalents......................................     13,330     13,589     13,907     14,452
</TABLE>
 
<TABLE>
<CAPTION>
                                                                          QUARTER ENDED
                                                             ---------------------------------------
                                                                                          DECEMBER
                                                              JUNE 30,    SEPTEMBER 30,      31,
                                                                1995          1995          1995
                                                             -----------  -------------  -----------
Net sales..................................................   $   1,568     $   2,056     $   2,348
<S>                                                          <C>          <C>            <C>
Gross profit...............................................         778         1,112         1,298
Income from operations.....................................         418           621           742
Net income.................................................         413           605           711
Net income per common share................................        0.03          0.04          0.05
</TABLE>
 
   
<TABLE>
<CAPTION>
                                                                            DECEMBER 31, 1995
                                                                         ------------------------
                                                                                         AS
                                                                          ACTUAL    ADJUSTED (2)
                                                                         ---------  -------------
CONSOLIDATED BALANCE SHEET DATA:
<S>                                                                      <C>        <C>
Working capital........................................................  $   1,004    $  10,244
Equipment and leasehold improvements, net..............................      7,204        7,204
Total assets...........................................................      9,649       18,889
Stockholders' equity...................................................      7,371       16,611
</TABLE>
    
 
- ------------------------
 
(1) Includes 3,674,885 shares of Common Stock which are issuable upon conversion
    of  the Company's Series C Preferred Stock. Excludes as of December 31, 1995
    (i) 997,000 shares of  Common Stock reserved for  issuance upon exercise  of
    outstanding  warrants,  (ii) 400,000  shares  of Common  Stock  reserved for
    issuance under the  Company's 1995 Stock  Option Plan, of  which options  to
    purchase  101,000  shares are  outstanding, (iii)  213,475 shares  of Common
    Stock reserved for issuance pursuant to the exercise of outstanding  options
    under  the Company's 1985 Incentive Stock Option Plan, (iv) 89,000 shares of
    Common Stock reserved  for issuance  under the  Company's 1994  Non-Employee
    Directors  Stock Option and  Stock Grant Plan, of  which options to purchase
    9,000 shares of  Common Stock  are outstanding,  and (v)  102,000 shares  of
    Common  Stock  issuable  upon  exercise of  other  non-qualified  options to
    purchase Common  Stock. See  "Capitalization," "Management  -- Stock  Option
    Plan," "Certain Transactions" and "Description of Capital Stock."
 
   
(2)  Adjusted to  give effect to  the sale  of 1,500,000 shares  of Common Stock
    offered by the  Company hereby  at the public  offering price  of $7.00  per
    share, and the application of the estimated net proceeds therefrom. See "Use
    of Proceeds" and "Capitalization."
    
 
                                       4
<PAGE>
                                  RISK FACTORS
 
    THE FOLLOWING RISK FACTORS SHOULD BE CONSIDERED CAREFULLY IN ADDITION TO THE
OTHER  INFORMATION  CONTAINED IN  THIS PROSPECTUS  BEFORE PURCHASING  THE COMMON
STOCK OFFERED HEREBY.
 
PRODUCT CONCENTRATION
 
    Since  1992  substantially  all  of  the  Company's  net  sales  have   been
attributable  to its  SPIRULINA PACIFICA  products. Sales  of SPIRULINA PACIFICA
products accounted for approximately 97% of  the Company's net sales in each  of
the  years ended March 31, 1994 and 1995  and the nine months ended December 31,
1995. The Company  believes that  SPIRULINA PACIFICA products  will continue  to
constitute  a substantial  portion of net  sales. The Company  plans to increase
production of Spirulina products substantially in 1996 by using a portion of the
net proceeds from this  offering to construct more  Spirulina ponds and  related
Spirulina  processing facilities. There can be  no assurance that the market for
Spirulina products in general, or  the Company's SPIRULINA PACIFICA products  in
particular,  will support  the increased  output anticipated  from the Company's
planned expansion. Any decrease in the overall level of sales of, or the  prices
for,  the  Company's  SPIRULINA  PACIFICA  products,  whether  as  a  result  of
competition, change in consumer demand, increased worldwide supply of  Spirulina
or  any other  factors, would  have a material  adverse effect  on the Company's
business, financial condition and results of operations. The Company's Spirulina
products are rich in natural beta carotene. Two large scale studies released  in
January  1996 on synthetic beta carotene  indicated that certain health benefits
previously associated with  beta carotene  generally do not  exist in  synthetic
beta  carotene. Although synthetic  beta carotene has  different properties from
natural beta carotene, consumers' perception  of beta carotene generally may  be
adversely  affected by these  and other studies. If  consumer perceptions of the
negative effects  of  synthetic beta  carotene  are extended  to  the  Company's
products  which contain natural beta carotene, the Company's business, financial
condition and results of operation  could be materially adversely affected.  See
"Management's  Discussions and  Analysis of  Financial Condition  and Results of
Operations."
 
CUSTOMER CONCENTRATION AND RISKS ASSOCIATED WITH CHANGES IN PRODUCT MIX
 
    Approximately 32.3% and 49.9% of the  Company's net sales in the year  ended
March  31, 1995 and the nine months  ended December 31, 1995, respectively, were
derived from sales to  the Company's top three  customers during those  periods.
The Company's largest customer, a Hong Kong-based natural products marketing and
distribution  company, accounted for approximately 3.0% and 31.4% of Cyanotech's
net sales in the year  ended March 31, 1995 and  the nine months ended  December
31,  1995, respectively. The  Hong Kong-based company  is a multilevel marketing
organization which purchases the Company's packaged consumer products and  sells
them  under  a private  label. The  Company understands  that the  government of
China, where the Hong  Kong-based company distributes the  vast majority of  the
products  it purchases  from the  Company, is  considering regulating multilevel
marketing organizations. Any such regulation could result in reduced orders  for
the  Company's products being placed by the Hong Kong-based company, which could
in turn have  a material  adverse effect  on the  Company's business,  financial
condition  and results of  operations. The Company's  second largest customer, a
Canadian  Spirulina   marketing   and  distribution   company,   accounted   for
approximately  16.8% and 11.0% of Cyanotech's net  sales in the year ended March
31, 1995  and  the  nine  months ended  December  31,  1995,  respectively.  The
Company's   third  largest  customer,  a  Dutch-based  Spirulina  marketing  and
distribution company, accounted for approximately 12.5% and 7.5% of  Cyanotech's
net  sales in the year  ended March 31, 1995 and  the nine months ended December
31, 1995,  respectively. The  loss of,  or significant  adverse change  in,  the
relationship  between the  Company and its  largest customer or  any other major
customer would  have  a  material  adverse effect  on  the  Company's  business,
financial  condition and  results of  operations. The  loss of,  or reduction in
orders from, any  significant customer,  losses arising  from customer  disputes
regarding  shipments,  fees,  product  condition  or  related  matters,  or  the
Company's inability to collect accounts receivable from any major customer could
have a material adverse  effect on the  Company's business, financial  condition
and results of operations. See "Business -- Customers."
 
    A  majority of the Company's  net sales are derived  from the Company's bulk
SPIRULINA PACIFICA products, which have lower associated gross profit  (measured
in dollars) but higher associated gross margin (measured
 
                                       5
<PAGE>
as  a percentage  of net sales)  than the Company's  packaged consumer products.
Accordingly, an increase  in the percentage  of net sales  attributable to  bulk
products  would increase the Company's gross  margin. Conversely, an increase in
the percentage of the Company's net sales attributable to the Company's packaged
consumer products  would decrease  its gross  margin but  likely increase  gross
profit.  The  Company expects  that its  product  mix will  vary from  period to
period, and a decrease in orders from  a customer such as the Company's  largest
current  customer which purchases only  packaged consumer products could require
the Company to  reallocate greater portions  of its production  capacity to  its
lower  gross profit bulk products.  In such event, the  Company expects that its
gross margin  would  be  favorably  impacted but  that  its  earnings  would  be
adversely affected.
 
    The  Company currently estimates that net  sales for the three months ending
March 31, 1996  will be  comparable to  or lower than  net sales  for the  three
months  ended December 31,  1995, principally due  to (i) lower  orders from the
Company's largest customer and,  to a lesser extent,  (ii) less sunlight,  lower
temperatures  and more rainfall  related to normal  seasonality during the first
eight weeks of the quarter. The decrease in sales is expected to result in lower
net income in  the three  months ending  March 31,  1996 compared  to the  three
months  ended December  31, 1995.  Although there  can be  no assurance  in this
regard, based on discussions  with the Company's  largest customer, the  Company
anticipates  that sales to  its largest customer should  continue to represent a
significant portion of the Company's total net sales in the three months  ending
March  31, 1996 and the  year ending March 31, 1997.  See "-- History of Losses;
Fluctuations in Operating Results" and "Management's Discussion and Analysis  of
Financial Condition and Results of Operations."
 
RISKS ASSOCIATED WITH EXPANSION INTO ADDITIONAL MARKETS AND PRODUCT DEVELOPMENT
 
    Other   than  its  Spirulina  and  phycobiliprotein  products,  the  Company
currently has no products  available for commercial  sale. The Company  believes
that  its  future success  is substantially  dependent on  the expansion  of the
worldwide Spirulina market and the Company's ability to successfully develop and
commercialize new products and penetrate  new markets. For example, the  Company
is  currently conducting  pilot production  work on  natural astaxanthin,  a red
pigment principally used in the aquaculture industry to impart pink color to the
flesh of pen-raised fish  and shrimp. Natural astaxanthin  is a new product  for
the  Company and  many production  issues must  be resolved  prior to commercial
production. The  Company's  future  product plans  also  include  a  genetically
engineered  mosquitocide and natural  food colorings. There  can be no assurance
that the  Company  can  successfully  develop  these  or  any  other  additional
products, that any such products will be capable of being produced in commercial
quantities  at reasonable  cost, or that  any such products  will achieve market
acceptance. The Company  has little experience  marketing its products  directly
and is generally dependent on the marketing skills and efforts of third parties.
There  can be no  assurances as to  whether the marketing  efforts of such third
parties will be successful or whether such third parties will eventually compete
with the Company or assist the Company's competitors. Many other companies  have
significantly greater marketing and product development experience and resources
to devote to marketing and product development than the Company. The Company has
entered into, and expects to enter into additional, selected strategic alliances
with  third  parties for  product  development and  marketing.  There can  be no
assurances regarding  the performance  of  such third  parties, or  the  overall
success,  if any, of such  strategic alliances. The inability  of the Company to
successfully develop or  commercialize these  or any  additional products  would
have  a material adverse  effect on the  Company's business, financial condition
and results of operations. See "Business -- Products Under Development."
 
CONCENTRATION OF PRODUCTION CAPACITY; RELIANCE ON CLIMATE CONDITIONS
 
    All of  the Company's  production capacity  is located  at its  Kailua-Kona,
Hawaii  facility,  on property  leased from  the  State of  Hawaii and  which is
situated on a 200-year-old lava flow adjacent to a dormant volcano. The  Company
maintains  minimal finished goods inventory. In  the event that production at or
transportation from such facility were  interrupted by fire, volcanic  eruption,
earthquake,  tidal wave,  hurricane, or  other natural  disaster, work stoppage,
termination or suspension of the Company's facility lease by the State of Hawaii
for public use or similar purposes, other regulatory actions or any other cause,
the
 
                                       6
<PAGE>
Company would be unable  to continue to produce  its products at such  facility.
Such  an  interruption  would  materially  and  adversely  affect  the Company's
business, financial  condition  and  results of  operations.  See  "Business  --
Manufacturing" and "-- Properties."
 
    Due  to the  importance of  sunlight and  a consistent  warm temperature for
microalgae growth, the Company's production is significantly affected by weather
patterns and seasonal weather changes.  For example, the Company estimates  that
its  ponds are  up to  approximately 20% less  productive between  the months of
November and February due  to fewer daylight hours  and lower temperatures  than
during  other months of the year. Any  unseasonably cool or cloudy weather would
adversely impact  the Company's  production and  could have  a material  adverse
effect on the Company's business, financial condition and results of operations.
See  "Management's Discussion and Analysis of Financial Condition and Results of
Operations -- Quarterly Results."
 
DEPENDENCE ON KEY PERSONNEL
 
    The Company's success  depends to  a significant extent  upon the  continued
service  of Gerald R.  Cysewski, its President and  Chief Executive Officer, and
other members of the Company's executive management and the loss of any of  such
key  executives could have a material  adverse effect on the Company's business,
financial condition or results of operations. Furthermore, the Company's  future
performance  depends  on  its  ability  to  identify,  recruit  and  retain  key
management personnel. The competition for  such personnel is intense, and  there
can  be no assurance the Company will be successful in such efforts. The Company
is also dependent  on its ability  to continue to  attract, retain and  motivate
production,  distribution, sales and  other personnel, of which  there can be no
assurance. The  failure  to attract  and  retain  such personnel  could  have  a
material  adverse  effect on  the  Company's business,  financial  condition and
results of operations. See "Management."
 
RISKS ASSOCIATED WITH MANAGING EXPANDING OPERATIONS
 
    Since 1992 the Company  has experienced substantial  growth in its  revenues
and  operations, and has undergone substantial changes in its business that have
placed significant  demands on  the Company's  management, working  capital  and
financial  and management control systems. The Company's current expansion plans
also may place a significant strain on the Company's management, working capital
and financial and management control  systems. Failure to upgrade the  Company's
operating,  management and financial control systems or difficulties encountered
during such upgrades  could adversely affect  the Company's business,  financial
condition  and results  of operations.  Although the  Company believes  that its
systems and controls are adequate to address its current needs, there can be  no
assurance  that such systems will be adequate to address future expansion of the
Company's business.  The  Company's  results of  operations  will  be  adversely
affected if revenues do not increase sufficiently to compensate for the increase
in operating expenses resulting from any expansion and there can be no assurance
that  any expansion will be profitable or  that it will not adversely affect the
Company's results  of  operations.  In  addition,  the  success  of  any  future
expansion  plans will depend in  part upon the Company's  ability to continue to
improve and expand  its management  and financial control  systems, to  attract,
retain  and motivate  key personnel, and  to raise  additional required capital.
There can be no assurance that the Company will be successful in these regards.
 
COMPETITION
 
    The  Company's  SPIRULINA  PACIFICA  products  compete  with  a  variety  of
vitamins,  dietary  supplements, other  algal  products and  similar nutritional
products available  to  consumers. The  nutritional  products market  is  highly
competitive.  It includes international, national,  regional and local producers
and distributors, many of whom have greater resources than the Company, and many
of whom  offer a  greater variety  of products.  The Company  believes that  its
direct  competition in the Spirulina market  currently is from Dainippon Ink and
Chemical's Earthrise  Farms facility  in  California. To  a lesser  extent,  the
Company  competes with numerous smaller farms  in China, India, Thailand, Brazil
and South Africa. The  Company's packaged consumer  products marketed under  its
Nutrex  brand also compete  with products marketed  by health food manufacturing
customers of  the Company  who  purchase bulk  Spirulina  from the  Company  and
 
                                       7
<PAGE>
package  it for retail  sales. A large Spirulina  production facility located in
Mexico, which  has been  closed since  1993, may  reopen. Should  this  facility
resume   production  in  substantial  quantities,  the  Company  will  encounter
increased competition.
 
    In addition to other Spirulina  based products, SPIRULINA PACIFICA  competes
in  certain markets  with other "green  superfoods," such as  Chlorella (a green
microalgae with sales  primarily in  Japan), APHAMIZOMENON  (a blue-green  algae
harvested  from  an  eutrophic  lake  in  Oregon  with  sales  primarily through
multilevel marketing) and  cereal grasses such  as barley, wheat  and kamut.  In
addition,  major  food and  beverage  companies may  become  more active  in the
nutritional products business,  either directly  or through  the acquisition  of
smaller  companies.  A decision  by another  company to  focus on  the Company's
existing or target markets  or a substantial increase  in the overall supply  of
Spirulina  could  have  a material  adverse  effect on  the  Company's business,
financial condition and results of  operations. While the Company believes  that
it  competes favorably  on factors such  as quality, brand  name recognition and
loyalty, the Company's SPIRULINA PACIFICA  products have typically been sold  at
prices  higher than other Spirulina products. There can be no assurance that the
Company will not experience competitive  pressure, particularly with respect  to
pricing,  that  could adversely  affect  its business,  financial  condition and
results of operations.
 
    The products being developed by  Cyanotech will compete with both  synthetic
and  natural products on  the basis of  price and quality.  The Company's future
competitors may include major chemical and specialized biotechnology  companies,
many  of which have  financial, technical and  marketing resources significantly
greater than  those  of  Cyanotech.  Cyanotech  believes  that  its  proprietary
technology  combined  with  the  metabolic diversity  and  high  productivity of
microalgae will allow the Company to compete in large market areas against large
companies, although there can be no assurance in this regard.
 
    The Company's natural astaxanthin  product, if successfully developed,  will
compete  directly against synthetic astaxanthin  produced and marketed worldwide
by Hoffman LaRoche.  The Company believes  that there are  no other  significant
producers  of  astaxanthin.  Although  the Company  is  unaware  of  any studies
indicating that natural astaxanthin has  any benefits not otherwise provided  by
synthetic  astaxanthin,  it  believes there  is  consumer demand  for  a natural
astaxanthin product. See "Business -- Competition."
 
DEPENDENCE ON PROPRIETARY TECHNOLOGY
 
    Although the  Company regards  its  proprietary technology,  trade  secrets,
trademarks  and similar  intellectual property  as critical  to its  success and
relies on  a  combination  of  trade secret,  contract,  patent,  copyright  and
trademark  law  to  establish  and  protect  its  rights  in  its  products  and
technology, there can be no assurance that  the Company will be able to  protect
its  technology  adequately or  that  competitors will  not  be able  to develop
similar technology  independently.  In addition,  the  laws of  certain  foreign
countries may not protect the Company's intellectual property rights to the same
extent  as the laws  of the United  States. Cyanotech has  had one United States
patent issued to it. Litigation in the United States or abroad may be  necessary
to  enforce  the  Company's patent  or  other intellectual  property  rights, to
protect the Company's trade secrets, to determine the validity and scope of  the
proprietary  rights of others or to  defend against claims of infringement. Such
litigation, even if successful, could result in substantial costs and  diversion
of resources and could have a material adverse effect on the Company's business,
results  of operations and financial condition. Additionally, although currently
there are  no pending  claims or  lawsuits that  have been  brought against  the
Company,  if any such claims  are asserted against the  Company, the Company may
seek to obtain a license under  the third party's intellectual property  rights.
There  can be no assurance  however, that a license  would be available on terms
acceptable or favorable to the Company, if at all.
 
    While the disclosure and use of  Cyanotech's know-how and trade secrets  are
generally controlled under agreements with the parties involved, there can be no
assurance  that all confidentiality agreements will be honored, that others will
not independently develop  equivalent technology, that  disputes will not  arise
concerning  the ownership of intellectual property, or that dissemination of the
Company's trade secrets will not occur.  The Company anticipates that it may  in
the future apply for additional patents on certain aspects of its technology. No
assurance  can be given  that its patent  applications will issue  as patents or
that any patent  now or to  be issued  will provide the  Company with  preferred
positions  with respect to the covered technology. Additionally, there can be no
assurance   that   any   patent   issued   to   the   Company   will   not    be
 
                                       8
<PAGE>
challenged,  invalidated or circumvented  or that the  rights granted thereunder
will provide adequate protection to  the Company's products. Furthermore,  there
can be no assurance that others will not independently develop similar products,
duplicate  the  Company's products  or, if  patents are  issued to  the Company,
design around  the patents  issued to  the Company.  See "Business  --  Patents,
Licenses and Trademarks."
 
VOLATILITY OF STOCK PRICE
 
   
    The  Company's stock price has been, and is likely to continue to be, highly
volatile. The market price of the  Common Stock has fluctuated substantially  in
recent  periods, rising from $1 1/8  on March 24, 1995, to  a high of $14 7/8 at
November 27, 1995, to $7 3/4 at March 21, 1996. Future announcements  concerning
the  Company  or its  competitors,  quarterly variations  in  operating results,
introduction of  new products  or changes  in product  pricing policies  by  the
Company  or its competitors, changes in market demand for Spirulina, acquisition
or loss of significant customers, weather patterns and other acts of nature that
may affect or  be perceived to  affect the Company's  production capability,  or
changes  in earnings estimates by analysts, among other factors, could cause the
market price of the Common Stock to fluctuate substantially. In addition,  stock
markets  have experienced extreme  price and volume  volatility in recent years.
This volatility has had a substantial effect on the market prices of  securities
of  many  smaller  public  companies for  reasons  frequently  unrelated  to the
operating performance of the specific companies. These broad market fluctuations
may adversely affect  the market  price of  the Common  Stock. There  can be  no
assurance  that the market price of the  Common Stock will not decline below the
public offering price. See "Price Range of Common Stock and Dividend Policy."
    
 
RISK OF PRODUCT LIABILITY
 
    Use of the Company's  products and potential  products in human  consumption
may  expose  the Company  to liability  claims  from the  use of  such products,
although the Company has not been subject  to any such claims to date.  Although
the  Company conducts regular quality assurance tests, there can be no assurance
that the  Company's products  will  not suffer  contamination at  the  Company's
facilities  or in the distribution channel, which  could in turn cause injury to
consumers. Although the Company does not have any reason to believe that natural
beta carotene increases health risks, one large scale study released in  January
1996 indicated that among smokers and persons who worked with asbestos, users of
synthetic  beta carotene suffered  a higher incidence of  death from lung cancer
and heart disease. The Company maintains product liability insurance in  limited
amounts  for  products involving  human consumption.  However,  there can  be no
assurance that the Company's insurance will be adequate or will remain available
to cover any  liabilities arising from  use of the  Company's current or  future
products. A contamination problem, product liability claim or recall of products
could  have  a  material adverse  effect  on the  Company's  business, financial
condition and  results of  operations. See  "Business --  Product Liability  and
Legal Proceedings."
 
RISKS ASSOCIATED WITH INTERNATIONAL SALES
 
    In  the  years ended  March  31, 1994  and 1995  and  the nine  months ended
December 31, 1995, international sales accounted for approximately 32%, 42%  and
56%,  respectively,  of  the  Company's  net  sales.  The  Company  expects that
international sales will continue to represent a significant portion of its  net
sales. The Company's business, financial condition and results of operations may
be  materially adversely affected  by any difficulties  associated with managing
accounts receivable from international customers, tariff regulations, imposition
of governmental  controls, political  and economic  instability or  other  trade
restrictions.   Although  the   Company's  international   sales  are  currently
denominated in United  States dollars, fluctuations  in currency exchange  rates
could  cause  the  Company's products  to  become relatively  more  expensive to
customers in  the affected  country, leading  to a  reduction in  sales in  that
country.  Additionally,  the Company's  largest  customer resells  the Company's
products principally  in mainland  China, and  thus the  Company is  exposed  to
political,  legal, economic  and other  risks and  uncertainties associated with
doing business in  China. See  "-- Customer Concentration  and Risks  Associated
with Changes in Product Mix," "Management's Discussion and Analysis of Financial
Condition  and Results of Operations" and  "Business -- Marketing and Sales" and
"-- Distribution."
 
                                       9
<PAGE>
HISTORY OF LOSSES; FLUCTUATIONS IN OPERATING RESULTS
 
    The Company was formed in  1983 and did not  become profitable on an  annual
basis  until fiscal  1992. As  of December  31, 1995,  the Company's accumulated
deficit was $5.4 million.  There can be  no assurance that  the Company will  be
consistently  profitable on either  a quarterly or an  annual basis. The Company
has experienced quarterly fluctuations in operating results and anticipates that
these fluctuations may continue in future periods. Future operating results  may
fluctuate  as  a result  of changes  in  sales levels  to the  Company's largest
customers, new product introductions, weather patterns, the mix between sales of
bulk products and packaged consumer products, start-up costs associated with new
facilities, expansion into new markets, sales promotions, competition, increased
energy costs, the announcement or introduction of new products by the  Company's
competitors,  changes in the  Company's customer mix, and  overall trends in the
market for  Spirulina products.  While a  significant portion  of the  Company's
expense  levels are  relatively fixed,  and the  timing of  increases in expense
levels is based in large part on the Company's forecasts of future sales, if net
sales are below expectations in any given period, the adverse impact on  results
of  operations may  be magnified by  the Company's inability  to adjust spending
quickly enough  to compensate  for the  sales shortfall.  The Company  may  also
choose  to reduce prices or increase  spending in response to market conditions,
which may have a material adverse effect on the Company's results of operations.
 
    The Company currently estimates that net  sales for the three months  ending
March  31, 1996,  will be comparable  to or lower  than net sales  for the three
months ended December  31, 1995, principally  due to (i)  lower orders from  the
Company's  largest customer, a Hong Kong-based multilevel marketing organization
that purchases the Company's packaged consumer  products and sells them under  a
private  label and, to  a lesser extent, (ii)  less sunlight, lower temperatures
and more rainfall related to normal seasonality during the first eight weeks  of
the  quarter. The decrease in sales of packaged consumer products is expected to
result in lower net income in the three months ending March 31, 1996 compared to
the three months ended December 31, 1995. Although there can be no assurance  in
this  regard,  based on  discussions with  the  Company's largest  customer, the
Company anticipates  that  sales to  its  largest customer  should  continue  to
represent  a significant portion of  the Company's total net  sales in the three
months  ending  March  31,  1996  and  the  year  ending  March  31,  1997.  See
"Management's  Discussion  and Analysis  of Financial  Condition and  Results of
Operations -- Quarterly Results."
 
POTENTIAL DIFFICULTY IN OBTAINING FDA AND OTHER GOVERNMENT APPROVALS
 
    The  Company's  products,  potential  products  and  its  manufacturing  and
research  activities are subject to varying degrees of regulation by a number of
government authorities in the  United States and  in other countries,  including
the  Food and Drug Administration (the "FDA") pursuant to the Federal Food, Drug
and Cosmetic Act and  by the Environmental Protection  Agency ("EPA") under  the
Federal  Insecticide,  Fungicide and  Rodenticide  Act ("FIFRA").  Each  line of
products that  is or  may  be marketed  by the  Company,  its licensees  or  its
collaborators can present unique regulatory problems and risks, depending on the
product  type, uses  and method  of manufacture.  The FDA  regulates, to varying
degrees and in  different ways,  dietary supplements, other  food products,  and
diagnostic   medical  device   and  pharmaceutical   products,  including  their
manufacture, testing, exportation,  labeling, and, in  some cases,  advertising.
Generally,   prescription  pharmaceuticals  and   certain  types  of  diagnostic
products, as medical devices, are regulated more rigorously than foods, such  as
dietary  supplements. The EPA rigorously regulates pesticides, among other types
of products.
 
    The Company  is also  subject  to other  federal,  state and  foreign  laws,
regulations  and policies with respect to  labeling of its products, importation
of organisms, and occupational safety, among others. Federal, state and  foreign
laws,  regulations and policies are always  subject to change and depend heavily
on administrative policies and interpretations.  The Company works with  foreign
distributors  in  its compliance  with foreign  laws, regulations  and policies.
There can be no assurance  that any changes with  respect to federal, state  and
foreign  laws, regulations and  policies, and, particularly  with respect to the
FDA and EPA or other such  regulatory bodies, with possible retroactive  effect,
will  not have  a material adverse  effect on the  Company's business, financial
condition and results of operations. There can  be no assurance that any of  the
Company's  potential products  will satisfy  applicable regulatory requirements.
See "Business -- Government Regulation."
 
                                       10
<PAGE>
CONTROL BY OFFICERS AND DIRECTORS
 
    The Company's  officers and  directors  and their  affiliates will,  in  the
aggregate,  control approximately 39.8% of the voting power of the capital stock
of the  Company  upon completion  of  this offering.  As  a result,  in  certain
circumstances,  these  stockholders acting  together  may be  able  to determine
matters requiring approval  of the  stockholders of the  Company, including  the
election  of the  Company's directors,  or they  may delay,  defer or  prevent a
change in control of the Company. In addition, Eva R. Reichl, a director of  the
Company,  has the  contractual right  to nominate one  person for  election as a
director. See "Certain Transactions," "Principal Stockholders" and  "Description
of Capital Stock."
 
EFFECT OF ANTI-TAKEOVER PROVISIONS
 
    The  Company's Board of Directors has the authority to issue up to 5,000,000
shares of  Preferred  Stock, 734,977  of  which are  currently  outstanding  and
designated  as Series  C Preferred  Stock, and  to determine  the price, rights,
preferences and privileges of those shares without any further vote or action by
the Company's stockholders. The  rights of the holders  of Common Stock will  be
subject  to, and  may be  adversely affected  by, the  rights of  the holders of
Preferred Stock. The consent of holders of a majority of the outstanding  shares
of  Series C Preferred  Stock is required  to change the  powers, preferences or
rights of such shares, sell all or substantially all of the Company's assets  or
merge  the Company. Such rights could have  the effect of delaying, deferring or
preventing a change in control of the Company. While the Company has no  present
intention  to issue additional  shares of Preferred  Stock, such issuance, while
providing desirable flexibility in connection with the possible acquisitions and
other corporate  purposes,  could have  the  effect of  delaying,  deferring  or
preventing  a  change  in  control  of  the  Company  and  entrenching  existing
management. In addition, such Preferred  Stock may have other rights,  including
economic  rights senior  to the  Common Stock,  and, as  a result,  the issuance
thereof could have a material adverse effect  on the market value of the  Common
Stock.  The Company is also subject  to the anti-takeover provisions of Sections
78.411 through 78.444  of the  Nevada Revised Statutes,  which restrict  certain
"combinations" with "interested stockholders" unless certain conditions are met.
By  delaying and deterring unsolicited takeover attempts, these provisions could
adversely affect prevailing market  prices for the  Company's Common Stock.  See
"Description of Capital Stock."
 
SHARES ELIGIBLE FOR FUTURE SALE
 
    Sales  of substantial amounts of shares of Common Stock in the public market
following the offering could have an adverse  impact on the market price of  the
Common   Stock.  Upon  completion  of  this  offering,  the  Company  will  have
outstanding approximately  15.2 million  shares of  Common Stock,  assuming  the
conversion  of all the outstanding shares  of Preferred Stock into Common Stock,
no exercise  of  the Underwriters'  over-allotment  option and  no  exercise  of
options or warrants to purchase the Company's Common Stock. Of these shares, all
of  the Common Stock being sold hereby and approximately 5.5 million shares held
by existing stockholders will be freely  tradeable (unless such shares are  held
by  an "affiliate" of the Company as such term is defined in the Securities Act)
without restriction or registration under the Securities Act. The remaining  8.3
million  shares  were issued  and sold  by the  Company in  private transactions
("Restricted Shares") and are eligible for public sale only if registered  under
the Securities Act or sold in accordance with Rule 144 thereunder. Approximately
1.1  million of  the Restricted  Shares are currently  eligible for  sale in the
public market pursuant to Rule 144(k) (of which approximately 870,000 shares are
subject to  the  agreements not  to  sell described  below).  Approximately  7.2
million  additional Restricted Shares  will be eligible for  sale in reliance on
Rule 144 (of which approximately 6.6  million are subject to the agreements  not
to  sell described below). The directors, executive officers and stockholders of
the Company who  hold in  the aggregate  approximately 7.5  million shares  have
agreed,  subject to certain limited exceptions,  not to offer, sell or otherwise
dispose of,  directly  or  indirectly,  any  shares  of  Common  Stock,  or  any
securities  convertible into  or exercisable for,  or any rights  to purchase or
acquire, Common Stock owned by them for the 120-day period after the closing  of
this  offering without  the prior  written consent of  Van Kasper  & Company. In
addition, the Company has agreed that for a period of 120 days after the date of
this Prospectus, it will not, without the prior written consent of Van Kasper  &
Company,  issue, offer, sell, grant options  to purchase or otherwise dispose of
any equity security or  securities convertible into  or exchangeable for  equity
securities except for (i) shares of the Common Stock offered hereby, (ii) shares
of  Common  Stock issued  pursuant to  the exercise  of outstanding  options and
warrants,   (iii)   shares   of   Common   Stock   issued   pursuant   to    the
 
                                       11
<PAGE>
conversion  of  Preferred  Stock and  (iv)  options granted  to  its associates,
officers, directors  and consultants  so long  as none  of such  options  become
exercisable  during said 120-day period. The Company has reserved 400,000 shares
of Common  Stock for  issuance under  the  1995 Stock  Option Plan,  options  to
purchase  101,000  shares  of which  have  been  granted. The  Company  also has
outstanding options to purchase 213,475 shares, which options were granted under
the 1985  Incentive Stock  Option Plan.  In addition,  the Company  has  options
outstanding to purchase 9,000 shares under the 1994 Non-Employee Directors Stock
Option  and  Stock Grant  Plan and  other  non-qualified options  outstanding to
purchase 102,000  shares of  Common Stock.  The Company  has filed  registration
statements  under the Securities Act covering  an aggregate of 800,000 shares of
Common Stock  issuable under  the  Company's 1995  Stock  Option Plan  and  1985
Incentive Stock Option Plan. Shares issued upon the exercise of stock options or
previously  issued on exercise, generally will be available for sale in the open
market subject to Rule 144 volume  limitations applicable to affiliates and  the
lock-up agreements with Van Kasper & Company described above. No predictions can
be  made as  to the effect,  if any,  that market sales  of Common  Stock or the
availability of Common Stock for sale  will have on the market price  prevailing
from time to time. Sale of a substantial number of shares of Common Stock in the
public market following this offering could adversely affect the market price of
the Common Stock. See "Shares Eligible for Future Sale."
 
                                       12
<PAGE>
                                USE OF PROCEEDS
 
   
    The  net proceeds to the Company from the sale of the shares of Common Stock
offered by the  Company are estimated  to be approximately  $9.2 million.  Since
1993,  the  Company  has been  capacity-constrained,  with demand  for  its bulk
SPIRULINA PACIFICA  products exceeding  the Company's  production  capabilities.
Accordingly,  the Company has  not been able  to accept any  major new customers
since March 1995. The Company intends to use approximately $4 million of the net
proceeds of  the offering  to  construct additional  culture ponds  and  related
processing  facilities in order to increase the production of SPIRULINA PACIFICA
products. A portion of the net proceeds are expected to be used as follows:  (i)
construction  of  a facility  and culture  ponds for  the production  of natural
astaxanthin,  (ii)   construction  of   a  laboratory/   warehouse,  and   (iii)
construction  of a cogeneration facility. The remainder of the net proceeds will
be used for working capital and general corporate purposes.
    
 
    Pending such uses, the Company intends to invest the net proceeds from  this
offering   in  short-term  interest-bearing   securities,  including  government
obligations and money market instruments.
 
                PRICE RANGE OF COMMON STOCK AND DIVIDEND POLICY
 
    Until February 27, 1996, the Company's Common Stock was quoted on The Nasdaq
SmallCap Market. On such date, the  Company's Common Stock began trading on  the
Nasdaq  National Market.  The following  table sets forth  the high  and low bid
quotation per share of the Company's Common Stock on The Nasdaq SmallCap  Market
and  the Nasdaq National Market, as the  case may be, for the periods indicated.
Quotations  from  The  Nasdaq  SmallCap  Market  are  from  the  Nasdaq  Monthly
Statistical  Summary  Report, and  reflect  inter-dealer prices,  without retail
mark-up, mark-down or commission, and may not represent actual transactions.
 
   
<TABLE>
<CAPTION>
                                                                            HIGH        LOW
                                                                          ---------  ---------
<S>                                                                       <C>        <C>
Year ended March 31, 1994
  First Quarter.........................................................  1 7/8      1 3/16
  Second Quarter........................................................  1 3/8      1 1/8
  Third Quarter.........................................................  1 9/16     1
  Fourth Quarter........................................................  1 1/2      1
Year ended March 31, 1995
  First Quarter.........................................................  1 1/8      13/16
  Second Quarter........................................................  1 5/8      15/16
  Third Quarter.........................................................  1 1/2      1 1/4
  Fourth Quarter........................................................  1 3/8      1 1/16
Year ending March 31, 1996
  First Quarter.........................................................  1 3/8      1 1/16
  Second Quarter........................................................  3 3/8      1 1/8
  Third Quarter.........................................................  14 7/8     5 1/8
  Fourth Quarter (through March 21, 1996)...............................  11 3/8     6 1/4
</TABLE>
    
 
   
    As of December 31, 1995, there were approximately 1,445 holders of record of
the Company's Common Stock. On March 21,  1996, the last reported sale price  of
the Common Stock on the Nasdaq National Market was $7 3/4 per share.
    
 
    The  Company has never declared or paid  cash dividends on its Common Stock.
Holders of Series C Preferred Stock are entitled to cumulative annual  dividends
at  the rate of $.40 per  share if and when declared  by the Board of Directors.
The Company  may  not pay  dividends  on the  Common  Stock until  it  has  paid
accumulated  dividends on the Series C  Preferred Stock. Cumulative dividends in
arrears on the Series C Preferred Stock as of December 31, 1995 amounted to $1.9
million ($2.563 per share). The Company  currently intends to retain all of  its
earnings  for  use in  its  business and  does  not anticipate  paying  any cash
dividends on its  Series C Preferred  Stock or Common  Stock in the  foreseeable
future. See "Description of Capital Stock."
 
                                       13
<PAGE>
                                 CAPITALIZATION
 
   
    The  following table sets forth (i) the  capitalization of the Company as of
December 31,  1995, (ii)  the pro  forma  capitalization of  the Company  as  of
December  31, 1995, assuming full conversion of all outstanding shares of Series
A Preferred  Stock  into  shares  of  Common Stock,  and  (iii)  the  pro  forma
capitalization  of the Company as  of December 31, 1995,  as adjusted to reflect
the sale by the  Company of 1,500,000  shares of Common  Stock pursuant to  this
offering  and the receipt  and application by  the Company of  the estimated net
proceeds therefrom, and after deducting the underwriting discount and  estimated
offering  expenses. The capitalization information set  forth in the table below
is qualified by the  more detailed consolidated  financial statements and  notes
thereto  included elsewhere in this Prospectus and should be read in conjunction
with such consolidated financial statements and notes.
    
 
   
<TABLE>
<CAPTION>
                                                                                          DECEMBER 31, 1995
                                                                                 -----------------------------------
                                                                                                          PRO FORMA
                                                                                  ACTUAL     PRO FORMA   AS ADJUSTED
                                                                                 ---------  -----------  -----------
<S>                                                                              <C>        <C>          <C>
                                                                                           (IN THOUSANDS)
Long-term liabilities, net of current portion..................................  $     908   $     908    $     908
                                                                                 ---------  -----------  -----------
Stockholders' equity:
Preferred Stock, $0.001 par value, 5,000,000 shares authorized
  Series A, 12% cumulative; 1,250,000 shares issued and outstanding, actual; no
   shares issued and outstanding, pro forma and pro forma as adjusted;
   liquidation value $0.40 per share plus unpaid accumulated dividends.........          1      --           --
  Series C, 8% cumulative, convertible; 734,977 shares issued and outstanding,
   actual, pro forma and pro forma as adjusted; liquidation value $5.00 per
   share plus unpaid accumulated dividends.....................................          1           1            1
Common Stock, $0.005 par value, 18,000,000 shares authorized; 9,807,575 shares
 issued and outstanding, actual; 10,057,575 shares issued and outstanding, pro
 forma; 11,557,575 shares issued and outstanding, pro forma as adjusted (1)....         49          50           58
Additional paid-in capital.....................................................     12,720      12,720       21,952
Accumulated deficit............................................................     (5,400)     (5,400)      (5,400)
                                                                                 ---------  -----------  -----------
  Total stockholders' equity...................................................      7,371       7,371       16,611
                                                                                 ---------  -----------  -----------
    Total capitalization.......................................................  $   8,279   $   8,279    $  17,519
                                                                                 ---------  -----------  -----------
                                                                                 ---------  -----------  -----------
</TABLE>
    
 
(1) Excludes 3,674,885 shares of Common Stock which are issuable upon conversion
    of the Company's Series C Preferred Stock. Also excludes as of December  31,
    1995  (i) 997,000 shares of Common Stock reserved for issuance upon exercise
    of outstanding warrants, (ii)  400,000 shares of  Common Stock reserved  for
    issuance  under the  Company's 1995 Stock  Option Plan, of  which options to
    purchase 101,000  shares are  outstanding, (iii)  213,475 shares  of  Common
    Stock  reserved for issuance pursuant to the exercise of outstanding options
    under the Company's 1985 Incentive Stock Option Plan, (iv) 89,000 shares  of
    Common  Stock reserved  for issuance  under the  Company's 1994 Non-Employee
    Directors Stock Option and  Stock Grant Plan, of  which options to  purchase
    9,000  shares of  Common Stock  are outstanding,  and (v)  102,000 shares of
    Common Stock  issuable  upon  exercise of  other  non-qualified  options  to
    purchase  Common  Stock. See  "Management  -- Stock  Option  Plan," "Certain
    Transactions" and "Description of Capital Stock."
 
                                       14
<PAGE>
                      SELECTED CONSOLIDATED FINANCIAL DATA
 
    The  following  table  sets  forth   for  the  periods  indicated   selected
consolidated  financial  data for  the  Company. The  consolidated  statement of
income data for the  years ended March  31, 1994 and  1995 and the  consolidated
balance  sheet  data at  March  31, 1994  and 1995  have  been derived  from the
Company's consolidated financial  statements, which  have been  audited by  KPMG
Peat  Marwick  LLP,  independent  certified  public  accountants.  The following
selected consolidated financial  and operating  data are qualified  by the  more
detailed  consolidated financial statements of the Company and the notes thereto
included elsewhere in  this Prospectus and  should be read  in conjunction  with
such  consolidated  financial  statements  and notes  and  the  discussion under
"Management's Discussion  and Analysis  of Financial  Condition and  Results  of
Operations" included elsewhere in this Prospectus. The consolidated statement of
income  data for the nine-month periods ended December 31, 1994 and 1995 and the
consolidated balance sheet data at December 31, 1995 are derived from  unaudited
consolidated financial statements which, in the opinion of management, have been
prepared  on the same basis as the audited consolidated financial statements and
contain all adjustments, consisting  of normal recurring adjustments,  necessary
for  a fair presentation of the financial position and results of operations for
such periods. The results of operations  for the nine months ended December  31,
1995 are not necessarily indicative of results to be expected for the full year.
 
<TABLE>
<CAPTION>
                                                                        YEAR ENDED MARCH 31,   NINE MONTHS ENDED
                                                                                                  DECEMBER 31,
                                                                        --------------------  --------------------
                                                                          1994       1995       1994       1995
                                                                        ---------  ---------  ---------  ---------
<S>                                                                     <C>        <C>        <C>        <C>
                                                                          (IN THOUSANDS, EXCEPT PER SHARE DATA)
CONSOLIDATED STATEMENT OF INCOME DATA
Net sales.............................................................  $   2,697  $   4,150  $   2,921  $   5,972
  Cost of sales.......................................................      1,495      2,275      1,582      2,784
                                                                        ---------  ---------  ---------  ---------
Gross profit..........................................................      1,202      1,875      1,339      3,188
                                                                        ---------  ---------  ---------  ---------
Operating expenses:
  Research and development............................................         59        171         93        243
  General and administrative..........................................        604        685        504        862
  Sales and marketing.................................................        319        301        208        302
                                                                        ---------  ---------  ---------  ---------
    Total operating expenses..........................................        982      1,157        805      1,407
                                                                        ---------  ---------  ---------  ---------
    Income from operations............................................        220        718        534      1,781
                                                                        ---------  ---------  ---------  ---------
Other income (expense):
  Interest income.....................................................         13         17         12         19
  Interest expense....................................................        (16)       (27)       (19)       (63)
  Other income, net...................................................         22         98         13     --
  Proportionate share of loss of joint venture........................        (35)       (37)       (37)    --
                                                                        ---------  ---------  ---------  ---------
    Total other income (expense)......................................        (16)        51        (31)       (44)
                                                                        ---------  ---------  ---------  ---------
    Net income before income taxes....................................        204        769        503      1,737
    Provision for income taxes........................................     --         --         --              8
                                                                        ---------  ---------  ---------  ---------
    Net income........................................................  $     204  $     769  $     503  $   1,729
                                                                        ---------  ---------  ---------  ---------
                                                                        ---------  ---------  ---------  ---------
    Net income per common share.......................................  $    0.02  $    0.05  $    0.04  $    0.12
                                                                        ---------  ---------  ---------  ---------
                                                                        ---------  ---------  ---------  ---------
Weighted average number of common shares and common share
 equivalents..........................................................     13,330     13,589     13,907     14,452
</TABLE>
 
<TABLE>
<CAPTION>
                                                                                       MARCH 31,
                                                                                  --------------------  DECEMBER 31,
                                                                                    1994       1995         1995
                                                                                  ---------  ---------  -------------
                                                                                            (IN THOUSANDS)
<S>                                                                               <C>        <C>        <C>
CONSOLIDATED BALANCE SHEET DATA:
Working capital.................................................................  $     870  $     600    $   1,004
Equipment and leasehold improvements, net.......................................      3,365      4,635        7,204
Total assets....................................................................      5,132      6,212        9,649
Stockholders' equity............................................................      4,160      5,104        7,371
</TABLE>
 
                                       15
<PAGE>
                    MANAGEMENT'S DISCUSSION AND ANALYSIS OF
                 FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
OVERVIEW
 
    Substantially  all of the Company's resources are currently dedicated to the
production of SPIRULINA  PACIFICA, a nutritional  microalgae. The Company  sells
SPIRULINA  PACIFICA to health  food manufacturers, health  food distributors and
retail consumers on a worldwide basis. Through the application of its Integrated
Culture Biology Management ("ICBM") technology, the Company maintains continuous
algae cultures and produces a new crop  from each of its 45 algal culture  ponds
(aggregating  approximately 28 acres)  approximately every week  on average. For
the year ended March 31, 1994, with an average of 17 culture ponds in  operation
(aggregating  approximately 10 acres),  the Company had  net sales of $2,697,000
and net income of $204,000. For the  year ended March 31, 1995, with an  average
of  25  culture ponds  in operation  (aggregating  approximately 15  acres), the
Company had net sales of $4,150,000 and net income of $769,000.
 
    Since 1993 the Company  has been capacity-constrained,  with demand for  its
bulk   SPIRULINA   PACIFICA   products   exceeding   the   Company's  production
capabilities. Historically,  a majority  of the  Company's net  sales have  been
derived  from the Company's  bulk SPIRULINA PACIFICA  products, which have lower
associated gross profit (measured in dollars) but higher associated gross margin
(measured as a  percentage of net  sales) than the  Company's packaged  consumer
products.  Accordingly, an increase in the  percentage of net sales attributable
to bulk  products would  increase  the Company's  gross margin.  Conversely,  an
increase  in  the percentage  of  the Company's  net  sales attributable  to the
Company's packaged consumer products would decrease its gross margin but  likely
increase  gross profit. The Company expects that  its product mix will vary from
period to period, and a decrease in orders from a customer such as the Company's
largest current customer which purchases  only packaged consumer products  could
require the Company to reallocate greater portions of its production capacity to
its  lower gross profit bulk  products. In such event,  the Company expects that
its gross margin  would be  favorably impacted but  that its  earnings would  be
adversely affected. See "Risk Factors -- Product Concentration."
 
    The  Company currently estimates that net  sales for the three months ending
March 31, 1996  will be  comparable to  or lower than  net sales  for the  three
months  ended December 31,  1995, principally due  to (i) lower  orders from the
Company's largest customer, a Hong Kong-based multilevel marketing  organization
that  purchases the Company's packaged consumer  products and sells them under a
private label and, to  a lesser extent, (ii)  less sunlight, lower  temperatures
and  more rainfall related to normal seasonality during the first eight weeks of
the quarter. The decrease in sales of packaged consumer products is expected  to
result in lower net income in the three months ending March 31, 1996 compared to
the  three months ended December 31, 1995. Although there can be no assurance in
this regard,  based on  discussions  with the  Company's largest  customer,  the
Company  anticipates  that  sales to  its  largest customer  should  continue to
represent a significant portion  of the Company's total  net sales in the  three
months  ending March  31, 1996  and the  year ending  March 31,  1997. See "Risk
Factors -- Customer Concentration and  Risks Associated with Changes in  Product
Mix."
 
    The  Company is currently producing SPIRULINA PACIFICA at full capacity and,
with  a  portion  of  the  net  proceeds  of  this  offering,  is  planning   to
significantly  increase the  rate of  production by late  1996. There  can be no
assurance that the  favorable supply/demand  characteristics of  the market  for
SPIRULINA PACIFICA will continue. In order to meet the increasing demand for the
Company's   Spirulina  products,  the  Company  completed  construction  of  six
additional 36,000 square foot algal culture ponds during December 1995, bringing
the total  number of  ponds to  45. The  Company is  currently constructing  six
additional  such ponds  and installing  the associated  equipment. This  work is
expected to be completed by late  February 1996 and full production attained  by
early  March 1996. The Company intends to undertake a substantial pond expansion
project that is currently scheduled to be completed in late 1996 with a  portion
of the net proceeds from this offering.
 
    Using  a portion of the net proceeds  of this offering, the Company plans to
begin construction of a natural astaxanthin production facility in mid-1996.
 
                                       16
<PAGE>
RESULTS OF OPERATIONS
 
    The following table sets forth certain consolidated statement of income data
as a percentage of net sales for the periods indicated:
 
<TABLE>
<CAPTION>
                                                                               NINE MONTHS ENDED
                                                        YEAR ENDED MARCH 31,
                                                                                  DECEMBER 31,
                                                        --------------------  --------------------
                                                          1994       1995       1994       1995
                                                        ---------  ---------  ---------  ---------
Net sales.............................................      100.0%     100.0%     100.0%     100.0%
<S>                                                     <C>        <C>        <C>        <C>
  Cost of sales.......................................       55.4       54.8       54.2       46.6
                                                        ---------  ---------  ---------  ---------
Gross profit..........................................       44.6       45.2       45.8       53.4
                                                        ---------  ---------  ---------  ---------
Operating expenses:
  Research and development............................        2.2        4.1        3.2        4.1
  General and administrative..........................       22.4       16.5       17.2       14.4
  Sales and marketing.................................       11.8        7.3        7.1        5.1
                                                        ---------  ---------  ---------  ---------
    Total operating expenses..........................       36.4       27.9       27.5       23.6
                                                        ---------  ---------  ---------  ---------
    Income from operations............................        8.2       17.3       18.3       29.8
                                                        ---------  ---------  ---------  ---------
Other income (expense):
  Interest income.....................................        0.4        0.4        0.4        0.3
  Interest expense....................................       (0.5)      (0.7)      (0.6)      (1.0)
  Other income, net...................................        0.8        2.4        0.4     --
  Proportionate share of loss of joint venture........       (1.3)      (0.9)      (1.3)    --
                                                        ---------  ---------  ---------  ---------
    Total other income (expense)......................       (0.6)       1.2       (1.1)      (0.7)
                                                        ---------  ---------  ---------  ---------
    Net income before income taxes....................        7.6       18.5       17.2       29.1
    Income taxes......................................     --         --         --           (0.1)
                                                        ---------  ---------  ---------  ---------
    Net income........................................        7.6%      18.5%      17.2%      29.0%
                                                        ---------  ---------  ---------  ---------
                                                        ---------  ---------  ---------  ---------
</TABLE>
 
NINE MONTHS ENDED DECEMBER 31, 1995 AND 1994
 
  NET SALES
 
    Net sales for the  nine months ended December  31, 1995 increased 104.5%  to
$5,972,000  from $2,921,000 for  the comparable period in  1994. The increase is
attributable to increased prices, increased  sales of bulk Spirulina powder  and
tablets  and  increased  sales  of  packaged  consumer  products.  The increased
production is  a  result  of  the  Spirulina  production  expansions  that  were
completed  in  October  1994  and  May  1995.  Due  to  the  Company's  capacity
constraints, it has not been able to accept any major new customers since  March
1995.  However,  approximately  $1,752,000  of  the  period  to  period increase
resulted from  increased  sales  to  the  Company's  largest  customer,  a  Hong
Kong-based  natural products marketing and  distribution company which purchases
packaged consumer  products  for private  label  resale. See  "Risk  Factors  --
Customer Concentration and Risks Associated with Changes in Product Mix."
 
    International  sales represented 56% and 39% of total net sales for the nine
months  ended  December  31,  1995  and  1994,  respectively.  The  increase  is
attributable  principally  to the  Company's  increasing emphasis  on developing
international markets and higher sales of packaged consumer products into  Asian
retail markets.
 
  GROSS PROFIT
 
    Gross  profit  represents  net sales  less  the  cost of  goods  sold, which
includes the  cost  of materials,  manufacturing  overhead costs,  direct  labor
expenses and depreciation and amortization. The Company's gross profit increased
138.1% to $3,188,000 for the nine months ended December 31, 1995 from $1,339,000
in  the comparable period of 1994. The  Company's gross margin was 53.4% for the
nine months ended
 
                                       17
<PAGE>
December 31,  1995 compared  to 45.8%  for the  comparable period  of 1994.  The
increase  in gross margin was primarily attributable to higher prices and higher
production levels resulting  in the absorption  of fixed manufacturing  overhead
costs over a significantly increased sales volume during the period.
 
  OPERATING EXPENSES
 
    Operating  expenses were $1,407,000  for the nine  months ended December 31,
1995, an increase of 74.8% from $805,000  in the comparable period of the  prior
year,  and represented 23.6% of net sales compared to 27.5% of net sales for the
nine months ended  December 31,  1994. The improvement  as a  percentage of  net
sales was due to increased sales for the nine months ended December 31, 1995.
 
    RESEARCH  AND DEVELOPMENT.   Research  and development  expense increased to
$243,000, or 4.1% of  net sales, for  the nine months  ended December 31,  1995,
from  $93,000 or 3.2% of net sales, for the nine months ended December 31, 1994.
The increase from the prior period was primarily the result of the research work
done on natural beta  carotene products for the  joint venture partnership  with
Hauser  Chemical Research, Inc. ("Hauser")  and on natural astaxanthin. Research
and development costs are expected to  increase further during the remainder  of
the  year ending March 31, 1996,  and increase substantially during future years
as the  Company  continues  work  on the  development  of  natural  astaxanthin,
genetically engineered mosquitocide and other algae products.
 
    GENERAL  AND ADMINISTRATIVE.  General  and administrative expenses increased
to $862,000, or 14.4% of net sales, for the nine months ended December 31, 1995,
from $504,000, or 17.2%  of net sales,  for the comparable  period of the  prior
year.  This increase  in absolute  dollars was due  to the  payment of associate
incentive bonuses indexed to the Company's profitability during the nine  months
ended  December  31,  1995,  higher  insurance  costs  and  compensation expense
associated with grants of Common Stock to non-employee directors.
 
    SALES AND MARKETING.  Sales and marketing expenses increased to $302,000  or
5.1%  of net sales, for the nine  months ended December 31, 1995, from $208,000,
or 7.1% of net sales, for the comparable period of the prior year. The  increase
was  primarily  due  to  higher payroll  and  travel  expenditures.  The Company
anticipates that sales and marketing expenses will increase during the remainder
of the year ending March 31, 1996  and in future years as the Company  increases
its marketing efforts both domestically and internationally.
 
  PROPORTIONATE SHARE OF LOSS FROM JOINT VENTURE
 
    Proportionate  share of loss from joint venture represents the Company's 50%
ownership interest in a joint venture with Acquasearch, Inc. for the development
of astaxanthin. The loss in the  nine months ended December 31, 1994  represents
services  and facilities  and equipment  use that  was contributed  to the joint
venture by the  Company. The joint  venture was terminated  in November 1994  by
mutual consent and the Company has no further obligation under the joint venture
arrangement.
 
  INCOME TAXES
 
    The  tax provision  of $7,500  for the nine  months ended  December 31, 1995
represents estimated  alternative minimum  taxes payable.  The Company  made  no
provision  for income taxes for  the nine months ended  December 31, 1994 due to
the utilization of tax net operating loss carry forwards. As of March 31,  1995,
tax net operating loss and tax credit carryforwards amounted to $6.8 million and
$140,000,  respectively. Subject to certain  limitations and differences between
federal and state tax laws, the Company expects to apply these carryforwards  to
taxable  income and/or  income taxes in  the year  ending March 31,  1996 and in
future years until such carryforwards are fully utilized or expire unutilized.
 
                                       18
<PAGE>
YEARS ENDED MARCH 31, 1995 AND 1994
 
  NET SALES
 
    Net sales for the year ended March 31, 1995 were $4,150,000, a 54%  increase
over  net sales of $2,697,000 for the year ended March 31, 1994. The increase in
net sales  during the  year ended  March 31,  1995 was  due primarily  to  price
increases and significantly higher production and sales of bulk Spirulina powder
and  tablets. The  increased production was  the result  of Spirulina production
expansions that were completed in March and October of 1994.
 
    International sales represented 42% and 32% of total net sales for the years
ended March  31,  1995  and  1994,  respectively.  This  increase  reflects  the
Company's increasing emphasis on developing international markets.
 
  GROSS PROFIT
 
    Gross profit increased 56.0% to $1,875,000 for the year ended March 31, 1995
from  $1,202,000 for the year ended March 31, 1994. The slight increase in gross
margin to 45.2% for the year ended March 31, 1995 from 44.6% for the year  ended
March 31, 1994 was due primarily to higher prices and higher production levels.
 
  OPERATING EXPENSES
 
    Operating  expenses were  $1,157,000 for the  year ended March  31, 1995, an
increase of 17.8% from  $982,000 in the prior  year. These expenses  represented
27.9%  and 36.4%  of net  sales for  the years  ended March  31, 1995  and 1994,
respectively.
 
    RESEARCH AND DEVELOPMENT.  Expenditures for research and development  during
the  year ended March 31, 1995 increased  by 189.8% to $171,000 from the limited
activity of the prior year primarily as a result of the research work being done
for the joint venture partnership with Hauser.
 
    GENERAL AND ADMINISTRATIVE.   General and administrative expenses  increased
13.4%  to $685,000 during the year ended  March 31, 1995 primarily due to higher
insurance and payroll expenditures.
 
    SALES AND  MARKETING.    Sales  and marketing  expenses  decreased  5.6%  to
$301,000 during the year ended March 31, 1995 from 1994 due to lower advertising
and promotion expenditures associated with the Nutrex product line.
 
    Inflation during the years ended March 31, 1994 and 1995 and the nine months
ended  December  31,  1995 did  not  have  a material  impact  on  the Company's
operations.
 
QUARTERLY RESULTS
 
    The following table  sets forth certain  unaudited quarterly financial  data
for  the four  quarters in  the year ended  March 31,  1995 and  the first three
quarters in the  year ending March  31, 1996.  In the opinion  of the  Company's
management,  this unaudited information  has been prepared on  the same basis as
the audited consolidated financial statements contained herein and includes  all
adjustments  (consisting of  normal recurring adjustments)  necessary to present
fairly the information set forth therein. The operating results for any  quarter
are not necessarily indicative of results for any future period.
 
                                       19
<PAGE>
<TABLE>
<CAPTION>
                                                                          QUARTER ENDED
                                     ----------------------------------------------------------------------------------------
                                      JUNE 30,     SEPTEMBER 30,    DECEMBER 31,     MARCH 31,    JUNE 30,     SEPTEMBER 30,
                                        1994           1994             1994           1995         1995           1995
                                     -----------  ---------------  ---------------  -----------  -----------  ---------------
                                                                          (IN THOUSANDS)
<S>                                  <C>          <C>              <C>              <C>          <C>          <C>
CONSOLIDATED STATEMENT OF INCOME
 DATA:
Net sales..........................   $     930      $   1,043        $     948      $   1,229    $   1,568      $   2,056
  Cost of sales....................         516            525              539            695          790            944
                                          -----         ------            -----     -----------  -----------        ------
  Gross profit.....................         414            518              409            534          778          1,112
                                          -----         ------            -----     -----------  -----------        ------
Operating expenses:
  Research and development.........          24             30               39             78           69             89
  General and administrative.......         156            181              168            180          206            315
  Sales and marketing..............          65             69               75             92           85             87
                                          -----         ------            -----     -----------  -----------        ------
    Total operating expenses.......         245            280              282            350          360            491
                                          -----         ------            -----     -----------  -----------        ------
    Income from operations.........         169            238              127            184          418            621
                                          -----         ------            -----     -----------  -----------        ------
Other income (expense):
  Interest income..................           4              4                4              5            6              4
  Interest expense.................          (8)            (7)              (4)            (8)         (10)           (21)
  Other income, net................           9              1                3             85           (1)             1
  Proportionate share of loss of
   joint venture...................         (13)           (24)          --             --           --             --
                                          -----         ------            -----     -----------  -----------        ------
    Total other income (expense)...          (8)           (26)               3             82           (5)           (16)
                                          -----         ------            -----     -----------  -----------        ------
    Net income before income
     taxes.........................         161            212              130            266          413            605
    Provision for income taxes.....      --             --               --             --           --             --
                                          -----         ------            -----     -----------  -----------        ------
    Net income.....................   $     161      $     212        $     130      $     266    $     413      $     605
                                          -----         ------            -----     -----------  -----------        ------
                                          -----         ------            -----     -----------  -----------        ------
 
<CAPTION>
 
                                     DECEMBER 31,
                                         1995
                                     -------------
 
<S>                                  <C>
CONSOLIDATED STATEMENT OF INCOME
 DATA:
Net sales..........................    $   2,348
  Cost of sales....................        1,050
                                          ------
  Gross profit.....................        1,298
                                          ------
Operating expenses:
  Research and development.........           85
  General and administrative.......          341
  Sales and marketing..............          130
                                          ------
    Total operating expenses.......          556
                                          ------
    Income from operations.........          742
                                          ------
Other income (expense):
  Interest income..................            9
  Interest expense.................          (32)
  Other income, net................       --
  Proportionate share of loss of
   joint venture...................       --
                                          ------
    Total other income (expense)...          (23)
                                          ------
    Net income before income
     taxes.........................          719
    Provision for income taxes.....            8
                                          ------
    Net income.....................    $     711
                                          ------
                                          ------
</TABLE>
 
    The following table sets forth certain consolidated statement of income data
as a percentage of net sales for the periods indicated:
<TABLE>
<CAPTION>
                                                                      QUARTER ENDED
                                 ----------------------------------------------------------------------------------------
                                  JUNE 30,     SEPTEMBER 30,    DECEMBER 31,     MARCH 31,    JUNE 30,     SEPTEMBER 30,
                                    1994           1994             1994           1995         1995           1995
                                 -----------  ---------------  ---------------  -----------  -----------  ---------------
Net sales......................       100.0%         100.0%           100.0%         100.0%       100.0%         100.0%
<S>                              <C>          <C>              <C>              <C>          <C>          <C>
  Cost of sales................        55.5           50.3             56.9           56.6         50.4           45.9
                                      -----          -----            -----          -----        -----          -----
  Gross profit.................        44.5           49.7             43.1           43.4         49.6           54.1
                                      -----          -----            -----          -----        -----          -----
Operating expenses:
  Research and development.....         2.5            2.9              4.1            6.3          4.4            4.4
  General and administrative...        16.8           17.4             17.7           14.6         13.1           15.3
  Sales and marketing..........         7.0            6.6              7.9            7.5          5.4            4.2
                                      -----          -----            -----          -----        -----          -----
    Total operating expenses...        26.3           26.9             29.7           28.4         22.9           23.9
                                      -----          -----            -----          -----        -----          -----
    Income from operations.....        18.2           22.8             13.4           15.0         26.7           30.2
                                      -----          -----            -----          -----        -----          -----
Other income (expense):
  Interest income..............         0.4            0.4              0.4            0.4          0.4            0.3
  Interest expense.............        (0.9)          (0.7)            (0.4)          (0.6)        (0.6)          (1.0)
  Other income, net............         1.0            0.1              0.3            6.9         (0.1)        --
  Proportionate share of loss
   of joint venture............        (1.4)          (2.3)          --             --           --             --
                                      -----          -----            -----          -----        -----          -----
    Total other income
     (expense).................        (0.9)          (2.5)             0.3            6.6         (0.4)          (0.8)
                                      -----          -----            -----          -----        -----          -----
    Net income before income
     taxes.....................        17.3           20.3             13.7           21.6         26.3           29.4
    Provision for income
     taxes.....................      --             --               --             --           --             --
                                      -----          -----            -----          -----        -----          -----
    Net income.................        17.3%          20.3%            13.7%          21.6%        26.3%          29.4%
                                      -----          -----            -----          -----        -----          -----
                                      -----          -----            -----          -----        -----          -----
 
<CAPTION>
 
                                  DECEMBER 31,
                                      1995
                                 ---------------
Net sales......................         100.0%
<S>                              <C>
  Cost of sales................          44.7
                                        -----
  Gross profit.................          55.3
                                        -----
Operating expenses:
  Research and development.....           3.6
  General and administrative...          14.5
  Sales and marketing..........           5.6
                                        -----
    Total operating expenses...          23.7
                                        -----
    Income from operations.....          31.6
                                        -----
Other income (expense):
  Interest income..............           0.4
  Interest expense.............          (1.4)
  Other income, net............        --
  Proportionate share of loss
   of joint venture............        --
                                        -----
    Total other income
     (expense).................          (1.0)
                                        -----
    Net income before income
     taxes.....................          30.6
    Provision for income
     taxes.....................           0.3
                                        -----
    Net income.................          30.3%
                                        -----
                                        -----
</TABLE>
 
                                       20
<PAGE>
    Although the Company has been profitable in each of the last seven quarters,
there  can be no assurance that such  profitability will continue or that levels
of net sales, income from operations and net income will not vary  significantly
among  quarterly periods. The Company  has experienced quarterly fluctuations in
operating results and anticipates that these fluctuations may continue in future
periods. Due  to  the importance  of  sunlight and  temperature  for  microalgae
growth,  the Company's production is  significantly affected by weather patterns
and seasonal weather  changes. The Company  estimates that its  ponds are up  to
approximately  20% less productive  between the months  of November and February
due to less sunlight  and lower temperatures.  The decline in  net sales in  the
quarter  ended  December 31,  1994  from the  quarter  ended September  30, 1994
resulted from this seasonality combined with the fact that there was no increase
in the number of producing ponds between those two periods.
 
    The Company currently estimates that net  sales for the three months  ending
March  31, 1996  will be  comparable to or  lower than  net sales  for the three
months ended December  31, 1995, principally  due to (i)  lower orders from  the
Company's  largest customer, a Hong Kong-based multilevel marketing organization
that purchases the Company's packaged consumer  products and sells them under  a
private  label and, to  a lesser extent, (ii)  less sunlight, lower temperatures
and more rainfall related to normal seasonality during the first eight weeks  of
the  quarter. The decrease in sales of packaged consumer products is expected to
result in lower net income in the three months ending March 31, 1996 compared to
the three months ended December 31, 1995. Although there can be no assurance  in
this  regard,  based on  discussions with  the  Company's largest  customer, the
Company anticipates  that  sales to  its  largest customer  should  continue  to
represent  a significant portion of  the Company's total net  sales in the three
months ending March 31, 1996 and the year ending March 31, 1997.
 
    Future operating  results may  fluctuate as  a result  of changes  in  sales
levels  to the Company's  largest customers, new  product introductions, weather
patterns, the mix between sales of bulk products and packaged consumer products,
start-up costs associated with new facilities, expansion into new markets, sales
promotions,  competition,   increased   energy  costs,   the   announcement   or
introduction  of  new  products by  the  Company's competitors,  changes  in the
Company's customer mix, and overall trends in the market for Spirulina products.
See "Risk Factors -- History of Losses; Fluctuations in Operating Results."
 
LIQUIDITY AND CAPITAL RESOURCES
 
    In  recent  periods,  the  Company   has  met  its  operating  and   capital
requirements from cash flow from operating activities, additional borrowings and
proceeds from the exercise of warrants and stock options. The Company's cash and
cash  equivalent  balance increased  by $280,000  during  the nine  months ended
December 31, 1995. The  increase was primarily due  to increased profit  levels,
borrowings  from two  customers and proceeds  from the exercise  of warrants and
stock options. Major uses of cash during the nine months ended December 31, 1995
included $643,000 in additional accounts receivable to support the higher  sales
level  and $2,622,000 in additional investment in culture ponds and equipment to
increase Spirulina production capacity. Largely as a result of the increases  in
cash and accounts receivable, working capital increased $404,000 during the nine
months  ended  December  31,  1995. The  Company  presently  estimates  that its
existing capital resources,  the net  proceeds from this  offering and  interest
thereon,  together with its  facility and equipment  financing and expected cash
flow from  operations,  will be  sufficient  to  fund its  current  and  planned
operations  and capital expenditures.  The Company currently  has no bank credit
lines.
 
    As of December 31, 1995, the Company had construction commitments  totalling
$1,120,000,  which the Company intends to fund  from cash reserves and cash flow
from operations.  In addition,  the Company  intends to  use approximately  $7.5
million  of the  net proceeds  from this  offering for  the construction  of (i)
additional culture ponds and related processing facilities, (ii) a facility  and
culture   ponds   for   the   production  of   natural   astaxanthin,   (iii)  a
laboratory/warehouse, and (iv) a cogeneration facility. See "Use of Proceeds."
 
NEW ACCOUNTING STANDARDS
 
    In March 1995, the Financial Accounting Standards Board issued Statement  of
Financial Accounting Standards (SFAS) No. 121, "Accounting for the Impairment of
Long-Lived  Assets  for  Long-Lived Assets  to  Be  Disposed Of."  SFAS  No. 121
requires that long-lived  assets and certain  identifiable intangibles held  and
 
                                       21
<PAGE>
used  by an  entity be  reviewed for  impairment whenever  events or  changes in
circumstances indicate  that  the  carrying  amount  of  an  asset  may  not  be
recoverable.  If the  sum of  the expected  future cash  flows is  less than the
carrying amount of the asset, an  impairment loss is recognized. Measurement  of
that loss would be based on the fair value of the asset. Generally, SFAS No. 121
requires  that long-lived  assets and certain  intangibles to be  disposed of be
reported at the lower of  carrying amount or fair value  less cost to sell.  The
provisions of SFAS No. 121 must be adopted by the Company no later than April 1,
1996.  The Company has not determined when  it will adopt the provisions of SFAS
No. 121 but does not expect adoption to have a material effect on the  Company's
consolidated financial statements.
 
    In  October 1995, the  Financial Accounting Standards  Board issued SFAS No.
123, "Accounting for Stock-Based Compensation." SFAS No. 123 establishes a  new,
fair  value based  method of  measuring stock-based  compensation, but  does not
require an entity  to adopt  the new method  for preparing  its basic  financial
statements.  For  entities  not  adopting the  new  method  for  preparing basic
financial statements, SFAS No. 123 requires  disclosure in the footnotes of  pro
forma net earnings and earnings per share information as if the fair value based
method  had been adopted. Adoption of SFAS No. 123 is required no later than the
Company's year ending March  31, 1997. The disclosure  requirements of SFAS  No.
123  are effective  for financial  statements for  fiscal years  beginning after
December 31, 1995. The Company will  comply with the disclosure requirements  of
SFAS No. 123 in its financial statements for its year ending March 31, 1997.
 
                                       22
<PAGE>
                                    BUSINESS
 
OVERVIEW
 
    Cyanotech  develops and commercializes natural products from microalgae. The
Company  is  currently  producing   microalgae  products  for  the   nutritional
supplement   and  immunological  diagnostics  markets  and  is  also  developing
microalgae-based products for  the aquaculture  feed/pigments, biopesticide  and
food  coloring markets. Microalgae are a diverse group of over 30,000 species of
microscopic plants  which have  a wide  range of  physiological and  biochemical
characteristics  and  naturally  contain high  levels  of  nutrients. Microalgae
represent a largely unexplored and unexploited renewable natural resource, which
grow much faster  than land-based  plants. Under  favorable growing  conditions,
certain  microalgae  produce  a new  crop  every week.  Cyanotech  has designed,
developed and implemented  proprietary production  and harvesting  technologies,
systems  and processes which  eliminate many of  the stability and contamination
problems frequently encountered  in the  production of  microalgae. The  Company
believes  its technologies,  systems, processes  and favorable  growing location
permit year-round  harvesting of  its microalgal  products in  a cost  effective
manner. The Company believes that these accomplishments have not been equaled by
any other company, university or research institute.
 
    Cyanotech's  principal revenues  are derived from  sales of microalgae-based
"Spirulina" products for the vitamin and supplement market, which for the United
States alone is estimated at $3.7 billion. SPIRULINA PACIFICA is a unique strain
of Spirulina developed  by Cyanotech  which provides  a vegetable-based,  highly
absorbable  source  of  natural  beta  carotene,  mixed  carotenoids  and  other
phytonutrients, B vitamins, gamma linolenic acid ("GLA"), protein and  essential
amino  acids. The Company believes its  Hawaiian SPIRULINA PACIFICA has achieved
high brand identity  among both  wholesale and  retail customers,  and that  the
Company's  products  have  better  taste,  more  consistent  color  and  greater
concentrations of natural beta carotene than competing Spirulina products. Since
1993, the  Company  has been  capacity-constrained,  with demand  for  its  bulk
SPIRULINA PACIFICA products exceeding the Company's production capabilities. The
Company  has tripled its Spirulina production  capacity since 1993 and continues
to increase capacity.  Cyanotech currently  markets its products  in the  United
States  and twelve other  countries through a  combination of retail, wholesale,
and private label channels, and plans to market new products either directly  or
through strategic alliances where appropriate.
 
    Cyanotech   maintains  an  environmentally  responsible  philosophy  in  the
development and production of its products, using natural production methods and
resources which employ extensive recycling  of raw materials and nutrients.  The
Company  believes  that these  recycling methods  result in  substantially lower
operating costs. The  Company's production  system operates without  the use  of
pesticides  and herbicides,  and does not  create erosion,  fertilizer runoff or
water pollution. The Company believes that it is the only producer of microalgae
to receive organic certification.
 
INDUSTRY BACKGROUND
 
    Microalgae are a diverse group of microscopic plants that have a wide  range
of  physiological and  biochemical characteristics and  naturally contain, among
other things,  high levels  of  proteins, amino  acids, vitamins,  pigments  and
enzymes.  Microalgae grow  extremely fast, making  it possible to  harvest a new
crop every week utilizing optimal  culture and processing technologies. The  raw
materials  required  for microalgae  growth are  abundant and  include sunlight,
carbon dioxide and agricultural fertilizers.
 
    Research on  potential uses  of  microalgae began  in  the early  1900s  and
intensified  after  World War  II.  One of  the  first comprehensive  reviews on
applications of microalgae and methods to  grow microalgae was in ALGAL  CULTURE
FROM  LABORATORY TO  PILOT PLANT, published  by the Carnegie  Institute in 1953.
Most early work centered on microalgae as a food and this theme was carried into
recent work by NASA, which continues to  examine microalgae as a source of  food
as  well as a means to remove carbon dioxide and generate oxygen in outer space.
Current industry  and  university research  is  directed at  identifying  unique
compounds  produced  by  microalgae  for the  fine  chemical  and pharmaceutical
markets.
 
                                       23
<PAGE>
    Over 30,000 species of microalgae are known to exist and represent a largely
unexplored and  unexploited  renewable  natural  resource.  Microalgae  has  the
following  properties that make commercial production attractive: (1) microalgae
grow much faster  than land  grown plants; (2)  microalgae have  a uniform  cell
structure  with  no  bark,  stems,  branches  or  leaves,  which  permits easier
extraction of  products and  higher  utilization of  the microalgae  cells;  (3)
cellular  uniformity also makes  it practical to  manipulate and control growing
conditions in order to optimize a particular cell characteristic; (4) microalgae
contain a  wide  array  of  vitamins and  other  important  nutrients;  and  (5)
microalgae  contain  natural  pigments and  are  a potential  source  of medical
products.
 
    Commercial applications  for these  microscopic plants  include  nutritional
products, diagnostic products, aquaculture feed/pigments, natural food colorings
and  research  grade  chemicals.  The  Company  believes  that  microalgae could
potentially be  used for  other commercial  applications, including  genetically
engineered products for the biopesticide and pharmaceutical industries. The most
significant  microalgae  products  produced  today are  algae  utilized  as food
supplements. These include forms of Spirulina, Chlorella, lake grown blue  green
algae  and natural beta  carotene from DUNALIELLA  SALINA. These microalgae food
supplements  contain,  in   varying  degrees,  highly   absorbable  sources   of
phytonutrients  including  mixed  carotenoids,  B  vitamins,  GLA,  protein  and
essential  amino  acids.  Published  scientific  animal  studies  suggest   that
increased  levels of some of these natural  compounds in the diet may reduce the
risk of  many types  of cancer  and strengthen  the immune  system. The  Company
believes that demand for these microalgae products has increased as the benefits
of plant-based nutrients, commonly known as "green superfoods," are beginning to
receive promotion in retail markets outside the health food community.
 
    While  many  unique  compounds  have  been  identified  in  microalgae,  the
efficient and cost  effective commercial  production of  microalgae is  elusive.
Many  microalgae culture systems  have been designed and  tested and failed over
the last 20 years. Because microalgae produced for food supplements is typically
cultivated and  harvested  outdoors,  production is  affected  significantly  by
climate,  weather conditions and the chemical  composition of the culture media.
Without consistent sunlight, warm temperature, low rainfall and proper  chemical
balance,  microalgae will  not grow as  quickly, resulting  in longer harvesting
cycles, decreased pond utilization  and increased cost. Furthermore,  microalgal
growth  requires a  nutrient rich environment.  The high nutrient  levels in the
ponds promote the  growth of  unwanted organisms,  or "weeds,"  if the  chemical
composition  of the ponds changes from  its required balance. Once contamination
occurs, a pond must  be emptied, cleaned and  restarted, a process that  further
decreases pond utilization and increases production costs.
 
    Microalgae  producers also  face relatively  high harvesting  and processing
costs, particularly  with  respect to  the  energy  costs required  to  dry  the
microalgae  prior to packaging and the  labor required throughout the harvesting
and processing cycles. Once harvested, microalgal cells contain from 85% to  95%
water.  The high water content is due to internal water in the cells that cannot
be removed  by  mechanical  means.  The  Company  estimates  that  the  cost  of
conventional heat-based microalgae drying processes represents approximately 30%
of  total production  cost. Most  drying systems  also damage  or destroy oxygen
sensitive nutrients in the finished microalgae products.
 
THE CYANOTECH SOLUTION
 
    Cyanotech has designed, developed and implemented proprietary production and
harvesting  technologies,  systems  and  processes  which  reduce  many  of  the
stability and contamination problems frequently encountered in the production of
microalgae.  This proprietary production  system is known  as Integrated Culture
Biology  Management  ("ICBM").  Through  the  application  of  this  technology,
Cyanotech's  ponds are in production year-round  without any significant loss in
productivity  due  to   contamination.  The  Company   believes  that  such   an
accomplishment  remains  unique  to  Cyanotech.  Certain  aspects  of  the  ICBM
technology are also applicable to producing other microalgae products which  the
Company  currently has  under development.  The Company  believes that  its ICBM
technology combined with the  climate conditions at  its production facility  in
Hawaii make it a cost-effective producer of premium Spirulina products.
 
                                       24
<PAGE>
    In  addition  to  the  advantages  of  its  ICBM  technology,  Cyanotech has
developed a patented system for the  recovery of carbon dioxide from its  drying
system  exhaust gas, called OCEAN-CHILL DRYING. Since microalgae are essentially
microscopic "plants," they require sunlight, water, carbon dioxide and nutrients
for optimal  growth.  By  recovering  carbon dioxide  that  would  otherwise  be
released into the atmosphere, the Company is able to divert the recovered carbon
dioxide  back to the  algae cultures to  nourish the growing  algae. The Company
believes that this process  provides it with a  significant cost advantage  over
other  microalgae producers who must purchase carbon dioxide. OCEAN-CHILL DRYING
also dries microalgal products in a low oxygen environment which protects oxygen
sensitive nutrients. In addition, Cyanotech has developed an automated Spirulina
processing system, which enables a single operator to harvest and produce  dried
Spirulina powder.
 
    Another  major advantage for  the Company is the  location of its production
facility at the  Hawaii Ocean Science  and Technology ("HOST")  Park at  Keahole
Point,  Hawaii. The  Company believes  that the  combination of  consistent warm
temperature, abundant sunlight, and low rainfall  at this facility makes this  a
favorable location for economically cultivating microalgae on a large scale. The
Company  believes that in contrast to  its facility, other microalgae production
facilities  located  in  areas  lacking  these  characteristics  stop  producing
microalgae  for  up to  four months  a  year because  of unfavorable  climate or
weather conditions.
 
    At the HOST Park, the Company has access to cold, clean, deep sea water that
is pumped up from a depth of 2,000 feet. This sea water is used both as a source
of nutrients for microalgae  culture and as a  cooling agent in the  OCEAN-CHILL
DRYING  process.  Additionally, Cyanotech's  facility has  access to  a complete
industrial infrastructure and  is located 30  miles from a  deep water port  and
adjacent  to an airport. The  Company believes that the  combination of its ICBM
technology,  favorable  growing  location,  year-round  production   capability,
OCEAN-CHILL  DRYING process and automated  processing system can be successfully
applied to the large-scale cultivation of  other species of microalgae that  may
be  identified for commercial applications.  The Company is currently conducting
pilot production work on  natural astaxanthin, a red  pigment used primarily  in
the  aquaculture industry to impart  pink color to the  flesh of pen-raised fish
and shrimp. Among the Company's other microalgae products under development  are
a genetically engineered mosquitocide and natural food colorings.
 
CYANOTECH'S STRATEGY
 
    The  Company's  objective is  to be  the leading  developer and  producer of
microalgal products in  its existing and  future markets. The  Company seeks  to
achieve this objective through the following strategies:
 
    - INCREASE  THE  COMPANY'S SPIRULINA  MARKET SHARE.  The Company  intends to
      increase its world  market share  for Spirulina by  expanding channels  of
      distribution,  expanding geographically and locating new potential markets
      for Spirulina. The Company  plans to expand  domestic sales and  marketing
      efforts  for its Nutrex products and  private label packaged products, and
      to explore mass marketing opportunities for Spirulina based products.  The
      Company's products are sold in twelve foreign countries and the Company is
      investigating  ways  to  expand  the  global  presence  of  its  products,
      including through the  addition of  foreign distributors.  The Company  is
      investigating  potential additonal  uses for  Spirulina. To  this end, the
      Company intends  to  fund  limited  clinical  trials  on  the  effects  of
      Spirulina  on arthritis and the immune system, and to fund studies for the
      use of Spirulina as a premium animal feed.
 
    - PROMOTE BRAND  UNIQUENESS AND  PACKAGED PRODUCTS.  Cyanotech is  the  only
      Hawaiian  producer  of  Spirulina and  has  developed a  unique  strain of
      Spirulina marketed  as  "SPIRULINA  PACIFICA."  Manufacturers  who  market
      Cyanotech's  brand generally identify and  promote Hawaiian Spirulina as a
      superior product.  The  private label  customers  also promote  the  brand
      uniqueness  of  Hawaiian Spirulina,  which  the Company  believes provides
      competitive differentiation  in  the  marketplace. The  Company  plans  to
      increase  marketing emphasis  on packaged  products, which  generally have
      higher associated gross profit per  pound than bulk products. The  Company
      believes  that it  is the only  producer of microalgae  to receive organic
      certification.
 
                                       25
<PAGE>
    - INCREASE BREADTH OF PRODUCT OFFERINGS. The Company is developing and plans
      to develop other products from microalgae, utilizing, in part, its current
      production technologies. These products include aquaculture  feed/pigments
      and  biopesticides. The  Company is currently  conducting pilot production
      work  on  natural  astaxanthin,  a  red  pigment  used  primarily  in  the
      aquaculture  industry to impart pink color to the flesh of pen-raised fish
      and shrimp. Among  the Company's  other products under  development are  a
      genetically engineered mosquitocide and natural food colorings.
 
    - ESTABLISH  STRATEGIC  ALLIANCES. The  Company  intends to  market  new and
      existing products  through  strategic  alliances  where  appropriate.  The
      Company  believes that these alliances will allow  it to focus on its core
      business as a microalgal producer and  to gain access to broader  markets.
      For  example, the Company is currently discussing a strategic alliance for
      its proposed natural  astaxanthin product  with a  major aquaculture  feed
      formulator.
 
    - CONTINUE  IMPROVEMENT UPON PRODUCTION  METHODOLOGIES. Cyanotech intends to
      continue to  improve  upon  its ICBM  proprietary  production  system  and
      OCEAN-CHILL  DRYING system and apply certain  of those technologies in the
      development of additional  microalgae-based products  for the  aquaculture
      feed/pigments,  biopesticide, food coloring and nutrition markets, as well
      as other potential commercial uses.
 
    - PROMOTE ENVIRONMENTAL RESPONSIBILITY. Cyanotech has a strong commitment to
      the environment. The Company's  production system recovers carbon  dioxide
      from  its drying system  exhaust gas, recycles 100%  of the growing media,
      operates without the use of pesticides or herbicides, and does not  create
      erosion,  fertilizer runoff or water  pollution. The Company believes that
      these recycling methods result in significantly lower operating costs.
 
TECHNOLOGY
 
    Cyanotech  has  developed  the  following  proprietary  technology  for  the
efficient, stable and cost-effective production of microalgal products:
 
    - INTEGRATED  CULTURE BIOLOGY  MANAGEMENT. Most notable  among the Company's
      technology is  the proprietary  ICBM  microalgae production  method  which
      integrates  culture pond  chemistry and harvesting  and processing methods
      designed to maintain  optimal microalgae growing  conditions. The  Company
      believes  that ICBM has eliminated many of the stability and contamination
      problems  frequently  encountered  in   the  large  scale  production   of
      microalgae.  Currently,  the  Company's Spirulina  microalgae  is produced
      using ICBM in a system in which 100% of the growing media is  continuously
      recycled  to culture ponds to become the  nutrient base for the next crop.
      Culture ponds  generally  are  harvested  approximately  once  each  week.
      Spirulina  production  with  ICBM has  proven  to be  an  extremely stable
      operating  environment,  permitting  the  Company  to  grow  and   harvest
      Spirulina  year-round without any significant problems of contamination by
      unwanted algae and associated loss  of productivity. The Company  believes
      that  such an  accomplishment has not  been equaled by  any other company,
      university or research institute.
 
    - OCEAN-CHILL DRYING. Cyanotech  has also  developed and  patented a  drying
      system  for powder  microalgal products.  Called OCEAN-CHILL  DRYING, this
      unique system utilizes cold sea water  brought from a depth of 2,000  feet
      in  a  closed-cycle modified  spray-drying system  that cools  and removes
      moisture from the air exiting the dryer. This dryer air is then  recycled,
      permitting  the Company  to control  and reduce  oxygen levels  within the
      dryer, minimize product  oxidation and increase  carbon dioxide levels  to
      concentrations  that make recovery feasible.  The recovered carbon dioxide
      is then fed to the algae culture  ponds as a nutrient source. This  system
      substantially  eliminates  carbon  dioxide exhaust  emissions,  provides a
      higher quality  product, and  significantly  reduces production  costs  by
      recovering carbon dioxide that would otherwise have to be purchased.
 
                                       26
<PAGE>
PRODUCTS AND PRODUCT CANDIDATES
 
    The following table summarizes the market applications and current status of
the Company's current products and products under development.
 
<TABLE>
<CAPTION>
 
                                MARKET APPLICATION       STATUS
<S>                             <C>                      <C>
CURRENT PRODUCTS:
  SPIRULINA PACIFICA Powder     Health and nutrition     Domestic and international
                                                          wholesale and retail sales
  SPIRULINA PACIFICA Tablets    Health and nutrition     Domestic and international
                                                          wholesale and retail sales
  SPIRULINA PACIFICA Flakes     Health and nutrition     Domestic retail sales
  HAWAIIAN ENERGIZER Sports     Health and nutrition     Domestic retail sales
   Drink Powder
  HAWAIIAN ENERGIZER Tablets    Health and nutrition     Domestic retail sales
  Phycobiliproteins             Immunological
                                diagnostics              Domestic and international sales
PRODUCTS UNDER DEVELOPMENT:
  Natural Astaxanthin           Aquaculture pigment      Pilot production in process
  Genetically Engineered        Pesticide                Production system development work
   Mosquitocide                                           expected to start mid-1996
  Natural Food Colorings        Food manufacturers       Pilot production in process
</TABLE>
 
PRODUCTS
 
  SPIRULINA
 
    Cyanotech's  principal  product  is  a  nutritional  microalgae  marketed as
SPIRULINA PACIFICA, a unique strain of Spirulina developed by Cyanotech and sold
worldwide to  the health  and  natural foods  market.  SPIRULINA PACIFICA  is  a
vegetable  microalgae  that  is  a  highly  absorbable  source  of  natural beta
carotene, mixed carotenoids and other  phytonutrients, B vitamins, GLA,  protein
and  essential amino acids. The Company  believes SPIRULINA PACIFICA has greater
concentrations of natural beta carotene, better taste and more consistent  color
than  competing Spirulina  products. The  Company believes  that it  is the only
Spirulina producer to have its products and processes certified organic.
 
    Spirulina is  a  naturally  occurring microscopic  plant  which  grows  wild
throughout  the world in alkaline  environments such as soda  lakes. It has been
used for thousands of years  as a food. Today, Spirulina  is used by the  health
conscious  consumer for a variety  of immediate and long  term effects. Based on
customer testimonials, the Company believes that the primary immediate  benefits
Spirulina  provides are  increased energy and,  in people who  have arthritis or
injuries,  decreased  joint  pain.  Spirulina  is  a  good  source  of   natural
phytonutrients,  including carotenoids and  phycocyanin, among others. Published
scientific animal studies suggest that increased levels of some of these natural
compounds in the diet may reduce the risk of many types of cancer and strengthen
the immune system.
 
    The Company produces SPIRULINA  PACIFICA in three  forms: powder, flake  and
tablets.  Powder is used as an ingredient in health food drinks while flakes are
used as a seasoning on  salads and pasta. Tablets are  consumed daily as a  food
supplement.  The  retail  price  of the  Company's  Spirulina  packaged consumer
products is approximately $17.00 for a one-month supply.
 
    The Company  also  produces and  markets  two products  under  the  HAWAIIAN
ENERGIZER  name. HAWAIIAN ENERGIZER sports  drink contains complex carbohydrates
and vegetarian protein in  combination with SPIRULINA  PACIFICA, Bee Pollen  and
Siberian  Ginseng. HAWAIIAN  ENERGIZER tablets  contain SPIRULINA  PACIFICA, Bee
Pollen and Siberian Ginseng.
 
                                       27
<PAGE>
  PHYCOBILIPROTEINS
 
    Cyanotech also produces phycobiliproteins which are sold to the medical  and
biotechnology   research  industry.  Phycobiliproteins  are  highly  fluorescent
pigments purified from microalgae. Their spectral properties make them useful as
tags or markers  in many  kinds of biological  assays, such  as flow  cytometry,
fluorescence immunoassays and fluorescence microscopy.
 
    The  Company produces a line of  four phycobiliprotein products with various
spectral properties. R-phycoerythrin (RPE)  is a red  pigment used primarily  in
flow  cytometry.  Allo-phycocyanin (APC)  is a  blue pigment  also used  in flow
cytometry, but typically in  combination with RPE to  form a fluorescent  tandem
phycobiliprotein    conjugate    which   improves    sensitivity.   Cross-linked
allo-phycocyanin (XL-APC) is a stabilized form of APC which can be used in  very
diluted  solution without problems of degradation. C-phycocyanin (CPC) is also a
blue pigment  and, although  not used  extensively in  cytometry, has  potential
applications  in food  and cosmetics  coloring. The  Company's phycobiliproteins
currently  range  in  price   from  $5,000  to  $33,000   per  gram.  Sales   of
phycobiliproteins  accounted for less than 3% of the Company's net sales for the
nine months  ended December  31, 1995.  The Company  anticipates that  sales  of
phycobiliproteins will not be material in future periods.
 
PRODUCTS UNDER DEVELOPMENT
 
    Cyanotech's  expertise  is  in  the  development  of  efficient,  stable and
cost-effective production systems for microalgal products. The Company does  not
conduct basic scientific research to identify new microalgal products or develop
new  microalgal  products  through  genetic  engineering.  Rather,  the  Company
investigates  specific  microalgae  identified  in  scientific  literature   for
potentially  marketable  products.  When  necessary,  the  Company  will license
specific organisms and/or basic science technology for pilot-studies.
 
    Three  products  are   under  active  development   by  Cyanotech:   natural
astaxanthin, genetically engineered mosquitocide and natural food colorings.
 
  NATURAL ASTAXANTHIN
 
    Astaxanthin  is a red pigment used  primarily in the aquaculture industry to
impart pink  color to  the flesh  of pen-raised  fish and  shrimp. For  example,
without  astaxanthin in their diet, the flesh  of pen-raised salmon is white and
has a limited market. The astaxanthin  market currently is dominated by  Hoffman
LaRoche,  which produces synthetic astaxanthin  from petrochemicals. The Company
believes that  Hoffman  LaRoche currently  sells  synthetic astaxanthin  to  the
aquaculture industry at approximately $1,140 per pure pound.
 
    The  Company is  currently discussing a  strategic alliance  for its natural
astaxanthin with a major aquaculture feed formulator. The Company has also  been
working  with this feed formulator  to schedule feeding tests  at a major salmon
production facility. Presently, feeding schedules call for Cyanotech to  deliver
limited amounts of natural astaxanthin product beginning in March 1996.
 
    Using  a portion of the net proceeds  of this offering, the Company plans to
begin construction of  a natural  astaxanthin production  facility by  mid-1996.
Natural  astaxanthin is a new product for the Company and many production issues
must be resolved prior to commercial production. There can be no assurance  that
the Company will resolve production issues or that the Company will successfully
complete  its pilot production  scale studies of  natural astaxanthin. See "Risk
Factors -- Risks Associated with  Expansion into Additional Markets and  Product
Development" and "-- Competition."
 
  GENETICALLY ENGINEERED MOSQUITOCIDE
 
    A  genetically engineered  mosquitocide was  developed at  the University of
Memphis by a  team under  the direction of  Professor Edward  Stevens, Jr.,  who
successfully  cloned the toxin gene  from BACILLUS THURINGINSIS VAR, ISRAELENSIS
(Bti) into the  blue-green algae SYNECHOCOCCUS.  The bacterial toxin  of Bti  is
very  specific to mosquitoes  and black flies,  while the blue-green  algae is a
food  for  mosquito  larvae.  The  Company  believes  that  when  applied  to  a
mosquito-infested  body  of  water, the  algae  could  act as  an  effective and
environmentally safe means of control.
 
    In June 1995, Cyanotech signed an exclusive worldwide license agreement with
the University of  Memphis to  manufacture and sell  the genetically  engineered
mosquitocide. Development of a commercial
 
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<PAGE>
production  system is  scheduled to  start by mid-1996.  In addition  to being a
nuisance, mosquitoes are carriers for  viral encephalitis in the United  States,
and  major  carriers for  a number  of diseases  throughout the  world including
malaria, yellow fever,  dengue fever  and filariasis. The  Company is  currently
investigating   the   possible   application  of   this   technology   to  other
biopesticides.
 
  NATURAL FOOD COLORINGS
 
    Natural beta carotene, a  fat soluble pigment found  in many plants, can  be
used  as a yellow/orange  coloring agent for margarine,  cake mixes, soft drinks
and other  products.  The Company  believes  that  there are  no  other  natural
yellow/orange food colorings available today.
 
    In  August 1994,  Cyanotech and Hauser  formed a  joint venture partnership,
BetaPharm International,  to develop,  produce and  sell products  derived  from
DUNALIELLA  SALINA (natural beta carotene). Pilot  scale studies are underway to
determine the economic and technical  feasibility of producing certain  products
derived  from natural beta carotene.  If the results of  the project warrant and
market conditions dictate, the joint venture  will proceed to obtain funding  to
commercialize  the  product. The  parties  must agree  on  all commercialization
funding  decisions.  If  commercialization  (i.e.,  obtaining  production  plant
funding) cannot be reached by December 31, 1996, the joint venture will dissolve
and licenses granted by the parties under the joint venture will terminate.
 
  OTHER POTENTIAL PRODUCTS
 
    Many  potential  commercial substances  have  been identified  in microalgae
including amino acids, vitamins, fatty acids, pigments, enzymes,  anti-bacterial
agents  and anti-viral  agents. Cyanotech believes  that it has,  and is further
developing, technology which  will allow  the Company  to produce  a variety  of
products  from  microalgae.  Of  particular  interest  to  the  Company  is  the
production of natural colorants for use  in foods and cosmetics and an  expanded
line  of  biopesticides through  genetic  manipulation of  microalgae. Cyanotech
believes that  a large  market may  exist  for these  products, and  that  while
government  approval  for  such products  is  likely to  be  required, Cyanotech
believes approval may be obtained in a shorter time period and with less expense
than for pharmaceutical  products. The  Company believes that  as new  potential
products  are  either identified  in microalgae  or genetically  engineered into
microalgae, it  will be  in a  unique  position to  employ its  proprietary  and
commercially  proven  technology  for  the cost  effective  production  of these
potential products.
 
MANUFACTURING
 
  SPIRULINA
 
    Cyanotech began culturing SPIRULINA PACIFICA in 1985 at its present facility
at the HOST Park. SPIRULINA PACIFICA is cultured in shallow, open ponds adjacent
to the Pacific Ocean. Paddlewheels  agitate the water, permitting even  exposure
of  the algae to  the sun. A  combination of fresh  water and nutrient-rich deep
ocean water, drawn from  a depth of  2,000 feet, is used  to fill the  Spirulina
ponds.  Ninety-six trace  elements are supplied  by deep ocean  water. The other
major components  required  for growing  Spirulina  are food-grade  baking  soda
(sodium bicarbonate) and carbon dioxide.
 
    SPIRULINA  PACIFICA  is pumped  from the  culture ponds  through underground
pipes to a process building where it is screened for particulate matter and then
separated by stainless steel screens from the culture medium. It is then  washed
three  times with fresh  water and vacuum  filtered. SPIRULINA PACIFICA intended
for use in powder and tablets is dried by a patented OCEAN-CHILL DRYING process.
The Company uses deep ocean water in its OCEAN-CHILL DRYING process. The Company
obtains the cold water from the HOST Park at a cost substantially less than  the
cost  of generating the same cooling effect by refrigeration. The drying process
takes approximately three  seconds and  results in a  dark green  powder with  a
consistency similar to flour. SPIRULINA PACIFICA prepared in flake form is dried
in  a  more conventional  proprietary process.  Bulk SPIRULINA  PACIFICA powder,
tablets and flakes are packaged in foil laminate heat-sealed bags with an oxygen
absorbing pack sealed in each bag. This packaging ensures product freshness  and
extends the shelf life of bulk SPIRULINA PACIFICA.
 
    Carbon  dioxide is recovered  as a result of  the OCEAN-CHILL DRYING process
and fed back to  the culture ponds as  a nutrient. By use  of ICBM, all  culture
media    from    the   harvest    are    recycled   to    culture    ponds   and
 
                                       29
<PAGE>
additional nutrients are added to support the next growth phase. Active  culture
remaining  in the ponds  after harvest serves  to inoculate the  next batch. The
algae reproduces rapidly, and,  on average, approximately  one week is  required
before  the culture pond is again  harvested. Spirulina production with ICBM has
proven to be an extremely  stable operating environment, permitting the  Company
to  grow and harvest Spirulina without any significant problems of contamination
by unwanted algae and associated loss of productivity. The Company believes that
its  Spirulina   competitors  continue   to  experience   problems  of   culture
contamination  by  unwanted  algae,  requiring that  culture  ponds  be emptied,
cleaned and restarted. The Company is presently pursuing certification under the
international quality management system ISO 9000.
 
    Spirulina powder  is  difficult  to tablet  and  most  tablet  manufacturers
overcome  this difficulty  by either  adding high amounts  (from 10%  to 30%) of
excipients to "glue" the tablet together or by using a heat granulation  process
that  destroys nutrients. SPIRULINA PACIFICA tablets are produced by the Company
by blending  SPIRULINA  PACIFICA powder  with  a minimum  amount  of  excipients
(maximum of 2%) and tableting in a cold press compression tablet-making machine.
SPIRULINA  PACIFICA flakes  are produced  by blending  SPIRULINA PACIFICA powder
with food-grade lecithin  and drying this  in a proprietary  drying system.  The
Company's   packaged  consumer   products  are   bottled  and   labeled  by  two
subcontractors in California, both of which are certified cGMP manufacturers and
undergo regular governmental inspections.
 
    A sample  from  each lot  of  SPIRULINA  PACIFICA is  subjected  to  quality
assurance  testing. Quality  assurance testing includes  bulk density, moisture,
particulate matter, color and taste. In addition, each lot of SPIRULINA PACIFICA
is subjected to  a prescribed set  of microbiological tests  for food  products,
including  total  aerobic bacteria,  coliform  bacteria and  E.  coli. SPIRULINA
PACIFICA powder is certified  free of pesticides  and herbicides, and  certified
Kosher.
 
    Since 1993 Cyanotech has tripled its production capacity of Spirulina to its
present  annual production capacity of  350 metric tons per  year. In June 1995,
the Company more than doubled its drying capacity.
 
  NATURAL ASTAXANTHIN
 
    Cyanotech is  conducting  pilot  production work  to  develop  a  commercial
production  system for natural astaxanthin.  HAEMATOCOCCUS, the microalgae which
produces  astaxanthin,  grows  in  neutral  conditions  and  is  susceptible  to
contamination  by unwanted algae.  Cyanotech is developing  a proprietary system
which it believes will solve this problem. The Company employs a closed  culture
system  during  the initial  stage of  algal  growth, after  which the  algae is
transferred to open ponds for astaxanthin production. An additional advantage of
the Company's pilot system  is the ability to  control the temperature of  algal
cultures  by the use of cold seawater.  Natural astaxanthin is a new product for
the Company and  many production  issues must  be resolved  prior to  commercial
production.  There can be no assurance  that the Company will resolve production
issues or that the Company will successfully complete its pilot production scale
studies of  natural astaxanthin.  See  "Risk Factors  -- Risks  Associated  with
Expansion into Additional Markets and Product Development" and "-- Competition."
 
                                       30
<PAGE>
MARKETING AND SALES
 
    The  Company  believes  that  its present  bulk  customers  could  consume a
significant portion of the increased production of Spirulina from the facilities
expansion funded by a portion of the net proceeds of this offering. However,  it
is  the Company's  strategy to first  emphasize sales of  higher priced packaged
consumer products  through its  own Nutrex  brand and  private label  customers,
since  sales of packaged consumer products  carry higher associated gross profit
than sales of bulk products. Cyanotech intends to form strategic alliances  with
established  mass  market sales  and  distribution companies  to  sell Spirulina
products into mass  markets. The Company  also intends to  take certain  efforts
targeted  at  expanding  the  bulk  market  for  Spirulina  and  to  continue to
differentiate its products based on quality, taste and color consistency.
 
    - PRODUCT IDENTITY AND  BRAND UNIQUENESS.   Cyanotech is  the only  Hawaiian
      producer  of  Spirulina and  has developed  a  unique strain  of Spirulina
      marketed as  "SPIRULINA PACIFICA."  Manufacturers who  market  Cyanotech's
      brand  generally  identify and  promote Hawaiian  Spirulina as  a superior
      product. The private label customers also promote the brand uniqueness  of
      Hawaiian  Spirulina,  which  the  Company  believes  provides  competitive
      differentiation in the marketplace.
 
    - EXPAND SALES OF CONSUMER PACKAGED PRODUCTS.
 
     PRIVATE LABEL  CONSUMER  PACKAGED  PRODUCTS.    The  Company  has  achieved
     significant  sales  of  private  label  products  in  certain  Pacific  Rim
     countries. Cyanotech plans to capitalize upon its unique Hawaiian brand  to
     increase  the  number  of  both domestic  and  international  private label
     customers.
 
     NUTREX BRAND PRODUCTS.  The Company believes that a substantial opportunity
     exists to  increase domestic  sales of  its Nutrex  brand products.  Nutrex
     packaged  consumer  products and  certain  of the  Company's  private label
     products currently  are the  only  organic certified  microalgal  products,
     which  the  Company  believes  is  important  to  health  and  natural food
     consumers. The Company is launching a  new label and an intensified  retail
     marketing  program. The  initial thrust  of this  program will  be to focus
     resources on high  volume, large natural  food store chains  such as  Whole
     Foods,  Mrs.  Gooches, Alfalfas,  Wild Oats,  Bread  and Circus,  and Puget
     Consumers  Cooperatives.  The  Company  intends  to  hire  domestic   sales
     personnel and increase spending on Nutrex marketing activities.
 
    - DEVELOP  STRATEGIC ALLIANCES.  The  Company is seeking strategic alliances
      with sales and distribution  companies that have  proven track records  in
      mass  market sales and distribution outside  the health food industry. The
      objective is to generate sales of consumer packaged products in chain drug
      stores  and  discount  stores.  Cyanotech  anticipates  coordinating  this
      program with media advertising.
 
    - EXPAND  BULK SALES.  The Company intends to focus marketing efforts on its
      existing bulk  customers  in  order  to  increase  bulk  sales.  Cyanotech
      develops  product literature  and marketing materials  for bulk customers,
      sponsors cooperative advertising, participates in trade shows and provides
      speakers for product  forums and  press interviews. The  Company plans  to
      sponsor  feed studies on the  benefits of incorporating SPIRULINA PACIFICA
      in feed formulations for poultry, pets and fish in an effort to expand the
      bulk market for Spirulina products.
 
    - DIFFERENTIATE PRODUCTS ON QUALITY ADVANTAGES.   Cyanotech believes it  has
      established  a quality advantage for its  SPIRULINA PACIFICA in the health
      food and nutrition industry. The Company plans on maintaining its  premium
      status  through (i) continued  education of customers  about the Company's
      product quality and (ii) consistent improvement of product quality through
      improved processing and handling of finished goods.
 
DISTRIBUTION
 
    The majority of Cyanotech's bulk Spirulina sales are to companies with their
own Spirulina  product  lines. Many  of  these companies  identify  and  promote
Cyanotech's  Hawaiian Spirulina  in their  products. In  the United  States, the
Company sells directly  to manufacturers and  health food formulators.  Packaged
consumer products sell in the domestic market through an established health food
distribution  network and via mail order.  Orders for packaged consumer products
are taken at the store  level by one of  34 regional broker representatives  and
shipped  through one of 22 distributors. In  the foreign markets the Company has
 
                                       31
<PAGE>
appointed exclusive  sales distributors  for both  bulk Spirulina  and  packaged
consumer  products. The  Company now  has exclusive  sales distributors  for the
following regions: (i) Japan,  Korea, Taiwan and  Singapore; (ii) Canada;  (iii)
the Benelux Countries; (iv) Australia; (v) Hong Kong and China; and (vi) France.
 
CUSTOMERS
 
    Cyanotech   markets  and  sells  its   Spirulina  products  to  health  food
manufacturers, private label  customers, retail  distributors, natural  products
distributors  and direct to certain natural food stores. The Company's customers
range in size from large enterprises with  over $500 million in annual sales  to
small  neighborhood retail stores. Several of  the Company's major customers are
businesses that  were  established  exclusively to  market  and  sell  Spirulina
products. The Company cooperates closely with these customers to develop product
labeling  and  advertising designed  to educate  the  consumer about  the health
benefits of using a "green superfood" such as Spirulina and, more  specifically,
SPIRULINA  PACIFICA products. Net sales to the Company's three largest customers
increased from approximately 32.3% of net sales in the year ended March 31, 1995
to approximately 49.9% of net sales in the nine months ended December 31,  1995.
Since  1993 the Company has been  capacity-constrained, with demand for its bulk
SPIRULINA PACIFICA products exceeding the Company's production capabilities. The
Company has not been able to accept any major new customers since March 1995.
 
    HEALTH FOOD  MANUFACTURERS.   Health food  manufacturers use  the  Company's
products  as the key  ingredient in Spirulina  products, or as  an ingredient in
health food  formulations,  which they  manufacture  for sale.  These  customers
purchase  bulk powder or bulk tablets and package the products under their brand
label for sale to the health and natural food markets. In some instances,  these
customers  produce  products  under  private-labeling  arrangements  with  third
parties. Many of the products produced by these customers are often marketed and
sold in direct  competition with the  Nutrex line of  retail consumer  products.
However,  the  Company  differentiates  its  products  from  those  of  its bulk
customers  by  reserving  the  certified  organic  line  of  products  for  sale
exclusively under the Nutrex label and certain private labels.
 
    PRIVATE  LABEL  CUSTOMERS.   The  Company currently  provides  private label
retail consumer products to two international customers. Using Spirulina tablets
produced by the Company, the products are  packaged by one of the Company's  two
bottling subcontractors in Southern California, using product labels supplied by
the customer. Products for these customers are manufactured only upon receipt of
an order; finished product inventories are not maintained by the Company.
 
    RETAIL  DISTRIBUTORS.   According to WHOLE  FOODS RETAILER  magazine, in the
domestic health  and  natural food  industry,  retail distributors  account  for
approximately  57% of  all products sold  to health and  natural food retailers.
Retail  distributors  act  as  product  wholesalers  to  independent  and  chain
retailers.  The  majority of  domestic  Nutrex sales  in  the nine  months ended
December 31, 1995 were  to 22 distributors.  Pricing and promotional  strategies
with  respect to  retail distributors  are coordinated  by the  Company's master
broker, an independent consultant  retained by the  Company on a  month-to-month
basis.
 
    NATURAL  PRODUCTS DISTRIBUTORS.  In the nine months ended December 31, 1995,
the Company sold to three U.S. customers engaged in the business of distributing
natural  raw  materials  to  health   and  natural  food  manufacturers.   These
distributors   provide  their  customers   with  standardized  quality  control,
warehousing and distribution services, and charge a mark-up on the products  for
providing these services. These distributors may differentiate the products they
sell, but they generally treat the products as commodities, with price being the
major determining factor in their purchasing decision.
 
    NATURAL FOOD STORES.  Less than 5% of the Company's sales in the nine months
ended  December 31, 1995, were direct sales to independent or chain natural food
retail stores. The Company believes that most natural food retail stores  prefer
to purchase products from retail distributors.
 
COMPETITION
 
  SPIRULINA
 
    The  Company's  SPIRULINA  PACIFICA  products  compete  with  a  variety  of
vitamins, dietary  supplements, other  algal  products and  similar  nutritional
products available to consumers. The nutritional products
 
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<PAGE>
market  is highly competitive. It includes international, national, regional and
local producers and distributors, many of  whom have greater resources than  the
Company,  and many  of whom  offer a  greater variety  of products.  The Company
believes that its direct competition in  the Spirulina market currently is  from
Dainippon Ink and Chemical's Earthrise Farms facility in California and numerous
smaller  farms in China, India, Thailand, Brazil  and South Africa, but that the
Company is the only producer of certified organic microalgal consumer  products.
The  Company's packaged consumer  products marketed under  its Nutrex brand also
compete with products  marketed by  health food manufacturing  customers of  the
Company  who purchase bulk Spirulina from the  Company and package it for retail
sales. A large Spirulina  production facility in Mexico,  which has been  closed
since  1993, may reopen.  Should this facility  resume production in substantial
quantities, the Company would encounter increased competition.
 
    In addition to other Spirulina  based products, SPIRULINA PACIFICA  competes
in  certain markets  with other "green  superfoods," such as  Chlorella (a green
microalgae with sales  primarily in  Japan), APHAMIZOMENON  (a blue-green  algae
harvested  from  an  eutrophic  lake  in  Oregon  with  sales  primarily through
multilevel marketing) and  cereal grasses such  as barley, wheat  and kamut.  In
addition,  major  food and  beverage  companies may  become  more active  in the
nutritional products business,  either directly  or through  the acquisition  of
smaller  companies.  A decision  by another  company to  focus on  the Company's
existing markets or  target markets  or a  substantial increase  in the  overall
supply  of  Spirulina could  have  a material  adverse  effect on  the Company's
business, financial  condition  and results  of  operations. While  the  Company
believes  that  it competes  favorably on  factors such  as quality,  brand name
recognition  and  loyalty,  the  Company's  SPIRULINA  PACIFICA  products   have
typically  been sold at prices higher  than most other Spirulina products. There
can be no assurance that the  Company will not experience competitive  pressure,
particularly  with respect to pricing, that could adversely affect its business,
financial condition and results of operations. See "Risk Factors -- Competition"
and "--  Customer Concentration  and Risks  Associated with  Changes in  Product
Mix."
 
  PHYCOBILIPROTEINS
 
    There are four major competitors which manufacture phycobiliprotein products
for  sale, including Molecular  Probes, Inc., Quantify  Inc., Martek Biosciences
Corporation and  Prozyme Inc.  Cyanotech competes  with these  companies on  the
basis   of  price  and  quality.  In  addition,  one  large  potential  user  of
phycobiliproteins,  Coulter,  Inc.,   manufactures  phycobiliproteins  for   its
internal use. New synthetic fluorescent compounds have been developed by a third
party  which  are  superior  to  phycobiliproteins  in  some  applications.  The
advantage of the  synthetic compounds is  their lower molecular  weight and,  in
some  cases, their lower cost. While the Company's phycobiliprotein products may
not  be  able  to  compete  effectively  against  synthetic  compounds  in  some
applications,  Cyanotech's phycobiliproteins  have gained a  reputation for high
quality at a competitive price.
 
  PRODUCTS UNDER DEVELOPMENT
 
    The products being developed by  Cyanotech will compete with both  synthetic
and  natural products on  the basis of  price and quality.  The Company's future
competitors may include major chemical and specialized biotechnology  companies,
many  of which have  financial, technical and  marketing resources significantly
greater than  those  of  Cyanotech.  Cyanotech  believes  that  its  proprietary
technology  combined  with  the  metabolic diversity  and  high  productivity of
microalgae will allow the Company to compete in large market areas against large
companies, although there can be no assurance in this regard.
 
    The Company's natural astaxanthin  product, if successfully developed,  will
compete  directly against synthetic astaxanthin  produced and marketed worldwide
by Hoffman LaRoche.  The Company believes  that there are  no other  significant
producers  of  astaxanthin.  Although  the Company  is  unaware  of  any studies
indicating that natural astaxanthin has  any benefits not otherwise provided  by
synthetic  astaxanthin,  it  believes there  is  consumer demand  for  a natural
astaxanthin product.
 
    Cyanotech's proposed mosquitocide  product may,  if successfully  developed,
compete with chemical pesticides as well as other biopesticides. Three companies
currently manufacture a mosquito biopesticide
 
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<PAGE>
based on the bacterial Bti toxin: Abbot Laboratories, Novo and Sandoz. There can
be  no assurance that  Cyanotech's proposed product,  if successfully developed,
can or would compete favorably with the other Bti products currently available.
 
    The Company's natural food coloring, if successfully developed, will compete
directly with  synthetic  food  colorings  as well  as  natural  food  colorings
produced by other companies.
 
GOVERNMENT REGULATION
 
    The  Company's  products,  potential  products  and  its  manufacturing  and
research activities are subject to varying degrees of regulation by a number  of
government  authorities in the  United States and  in other countries, including
the Food and Drug Administration (the "FDA") pursuant to the Federal Food,  Drug
and  Cosmetic Act and  by the Environmental Protection  Agency ("EPA") under the
Federal Insecticide,  Fungicide, and  Rodenticide Act  ("FIFRA"). Each  line  of
products  that  is or  may  be marketed  by the  Company,  its licensees  or its
collaborators can present unique regulatory problems and risks, depending on the
product type, uses  and method  of manufacture.  The FDA  regulates, to  varying
degrees  and in  different ways, dietary  supplements, other  food products, and
diagnostic  medical  device   and  pharmaceutical   products,  including   their
manufacture,  testing, exportation,  labeling, and, in  some cases, advertising.
Generally,  prescription  pharmaceuticals  and   certain  types  of   diagnostic
products,  as medical devices, are regulated more rigorously than foods, such as
dietary supplements. The EPA rigorously regulates pesticides, among other  types
of products.
 
    The  Company  is also  subject  to other  federal,  state and  foreign laws,
regulations and policies with respect  to labeling of its products,  importation
of  organisms, and occupational safety, among others. Federal, state and foreign
laws, regulations and policies are always  subject to change and depend  heavily
on  administrative policies and interpretations.  The Company works with foreign
distributors in  its compliance  with foreign  laws, regulations  and  policies.
There  can be no assurance  that any changes with  respect to federal, state and
foreign laws, regulations and  policies, and, particularly  with respect to  the
FDA  and EPA or other such  regulatory bodies, with possible retroactive effect,
will not have  a material adverse  effect on the  Company's business,  financial
condition  and results of operations. There can  be no assurance that any of the
Company's potential products  will satisfy  applicable regulatory  requirements.
See  "Risk Factors -- Potential Difficulty in Obtaining FDA and Other Government
Approvals."
 
    The Federal Dietary Supplement Health and Education Act ("DSHEA")  regulates
the  use and marketing  of dietary supplements,  including vitamin products. The
DSHEA covers only dietary supplements and  contains a number of provisions  that
differentiate  dietary supplements from  other foods. The  DSHEA also sets forth
standards for adulteration  of dietary  supplements or  ingredients thereof  and
establishes  current food Good Manufacturing Practices ("cGMP") requirements for
dietary supplements. It also provides detailed requirements for the labeling  of
dietary  supplements, including  nutrition and ingredient  labeling. The Company
currently  believes  that  its  SPIRULINA   PACIFICA,  marketed  as  a   dietary
supplement, is exempt from FDA regulation as a food additive.
 
    The  Company's Spirulina manufacturing processes  and the Company's contract
bottlers are required to adhere  to cGMP as prescribed  by the FDA. The  Company
believes  that it is currently in compliance  with all applicable cGMP and other
food  regulations.  Such  regulations  specify  component  and  product  testing
standards,  quality assurance requirements, and  records and other documentation
controls. Compliance with  relevant cGMP  requirements can be  onerous and  time
consuming,  and there can be no assurance  that the Company can continue to meet
relevant FDA  manufacturing  requirements for  existing  products or  meet  such
requirements  for any  future products.  Ongoing compliance  with food  cGMP and
other  applicable  regulatory  requirements   are  monitored  through   periodic
inspections  by  state  and  federal agencies,  including  the  FDA,  the Hawaii
Department of Health and comparable  agencies in other countries. The  Company's
processing  facility  is also  inspected annually  for organic  certification by
Quality Assurance  International  and for  Kosher  certification by  the  Kosher
Overseers  Association. The use of Spirulina as a food additive for seasoning on
salads or pasta or for such other food uses has not been cleared by the FDA. The
Company currently markets the product  for these food uses  on the basis of  its
belief  that its use in these food  applications is generally recognized as safe
and  therefore   is   not   subject   to   FDA   premarket   clearances   as   a
 
                                       34
<PAGE>
food  additive. A determination  that the Company  is in violation  of the FDA's
food cGMP  and other  food regulations,  including food  additive  requirements,
could  lead  to  the imposition  of  civil penalties,  including  fines, product
recalls or product seizures, and potentially criminal sanctions.
 
    As IN VITRO diagnostic medical device components, phycobiliprotein  products
do  not  currently  require  premarket  clearances by  the  FDA.  However,  as a
component of a medical  device, they can nonetheless  still be subject to  other
various medical device requirements, including cGMP requirements.
 
    All   new  color  additives  require  premarket  clearances  from  the  FDA.
Therefore, the Company's potential natural food color products will require  FDA
clearances,  unless  they  meet  the  requirements  of  current  color  additive
regulations. The Company's  proposed natural astaxanthin  product will need  FDA
clearance for use as a color additive in the United States. The Company believes
that  no regulatory approval is required for use of astaxanthin as a colorant in
foods in  major markets  outside the  United States.  The process  of  obtaining
clearances  for a new color additive  is expensive and time consuming. Extensive
information  is   required  on   the  toxicity   of  the   additive,   including
carcinogenicity  studies and  other animal testing.  No assurances  can be given
that any of the Company's proposed  products intended for use in coloring  foods
will be cleared by the FDA as color additives on a timely basis, if at all.
 
    FIFRA  requires the registration of most pesticides, including the Company's
proposed genetically engineered mosquitocide. The EPA also regulates under FIFRA
the experimental  testing  of  pesticides,  facility  inspections,  records  and
exports  of pesticides. The registration of a new pesticide must usually contain
different types of supporting  data, including product chemistry,  environmental
fate,  toxicology,  and  fish  and wildlife  studies.  Although  biochemical and
microbial  pesticides  are  sometimes  treated  differently  from   conventional
chemical pesticides because of their unique modes of action, low volumes, target
species  specificity or natural  occurrence, there can be  no assurance that EPA
registration of the Company's mosquitocide can be obtained on a timely basis, if
at all.
 
PATENTS, LICENSES AND TRADEMARKS
 
    Although the  Company regards  its  proprietary technology,  trade  secrets,
trademarks  and similar  intellectual property  as critical  to its  success and
relies on  a  combination  of  trade secret,  contract,  patent,  copyright  and
trademark  law  to  establish  and  protect  its  rights  in  its  products  and
technology, there can be no assurance that  the Company will be able to  protect
its  technology  adequately or  that  competitors will  not  be able  to develop
similar technology  independently.  In addition,  the  laws of  certain  foreign
countries may not protect the Company's intellectual property rights to the same
extent  as the laws  of the United  States. Cyanotech has  had one United States
patent issued to it. Litigation in the United States or abroad may be  necessary
to  enforce  the  Company's patent  or  other intellectual  property  rights, to
protect the Company's trade secrets, to determine the validity and scope of  the
proprietary  rights of others or to  defend against claims of infringement. Such
litigation, even if successful, could result in substantial costs and  diversion
of resources and could have a material adverse effect on the Company's business,
results  of operations and financial condition. Additionally, although currently
there are  no pending  claims or  lawsuits that  have been  brought against  the
Company,  if any such claims  are asserted against the  Company, the Company may
seek to obtain a license under  the third party's intellectual property  rights.
There  can be no assurance, however, that  a license would be available on terms
acceptable or favorable to the Company, if at all.
 
    While the disclosure and use of  Cyanotech's know-how and trade secrets  are
generally controlled under agreements with the parties involved, there can be no
assurance  that all confidentiality agreements will be honored, that others will
not independently develop  equivalent technology, that  disputes will not  arise
concerning  the ownership of intellectual property, or that dissemination of the
Company's trade secrets will not occur.  The Company anticipates that it may  in
the future apply for additional patents on certain aspects of its technology. No
assurance  can be given  that its patent  applications will issue  as patents or
that any patent  now or to  be issued  will provide the  Company with  preferred
positions  with respect to the covered technology. Additionally, there can be no
assurance   that   any   patent   issued   to   the   Company   will   not    be
 
                                       35
<PAGE>
challenged,  invalidated or circumvented  or that the  rights granted thereunder
will provide adequate protection to  the Company's products. Furthermore,  there
can be no assurance that others will not independently develop similar products,
duplicate  the  Company's products  or, if  patents are  issued to  the Company,
design around the patents issued to the Company. See "Risk Factors -- Dependence
on Proprietary Technology."
 
ASSOCIATES
 
    The Company employed 53 associates as of December 31, 1995, of which 49  are
full-time.  Approximately  20  associates  are involved  in  the  harvesting and
production process, five are involved  in research and product development,  and
the  remainder  are involved  in sales,  administration and  support. Management
believes that its relations  with its associates are  good. The Company has  not
experienced difficulty in attracting personnel. None of the Company's associates
are represented by a labor union.
 
    Effective  April 1, 1995, the Company  implemented a profit sharing plan for
all associates not covered under a separate management incentive plan. Under the
profit sharing plan, 5% of pre-tax profits are allocated based on gross wages to
non-management  associates  on  a  quarterly   basis.  Fifty  percent  of   each
associate's  profit sharing bonus is distributed  in cash on an after-tax basis,
the remainder is deposited in each associate's 401(k) account on a pre-tax basis
with a six year vesting schedule, based on years of service with the Company.
 
PROPERTIES
 
    The Company  is  located in  Kailua-Kona,  Hawaii,  at the  HOST  Park.  The
facility  in Kailua-Kona  consists of  approximately 77  leased acres containing
production ponds, a  processing facility, a  laboratory, administrative  offices
and  additional space  for production ponds.  All products are  produced at this
facility. The  property is  leased from  the  State of  Hawaii under  a  30-year
commercial  lease expiring in  2025. Cyanotech has  made a request  to obtain an
option to lease an additional 160 acres at the HOST Park, which request has been
approved, subject to  preparation of final  documentation. The Company  believes
that  there is sufficient available land at  the HOST Park to meet its currently
planned needs. The Company has no  production facilities or offices outside  the
State of Hawaii.
 
PRODUCT LIABILITY AND LEGAL PROCEEDINGS
 
    Cyanotech  is not currently  subject to any  material legal proceedings. The
Company may  from time  to time  become  a party  to various  legal  proceedings
arising  in  the normal  course  of its  business.  These actions  could include
product  liability,  employee-related  issues  and  disputes  with  vendors   or
customers.  Due to  the nature  of the  Company's products,  the Company  may be
subject to  product  liability  claims  involving  personal  injuries  allegedly
related  to  the  Company's  products.  The  Company  carries  product liability
insurance in limited amounts  for products involving  human consumption. In  the
opinion   of  management,  broader  product   liability  insurance  coverage  is
prohibitively expensive  at  this  time. Nevertheless,  any  future  claims  are
subject  to the uncertainties related to  litigation and the ultimate outcome of
any such proceedings or  claims cannot be predicted.  There can be no  assurance
that  the Company's insurance is adequate or  will remain available to cover any
such claims. In addition, the  Company may experience product recalls,  although
no such recalls have been required to date. See "Risk Factors -- Risk of Product
Liability."
 
                                       36
<PAGE>
                                   MANAGEMENT
 
DIRECTORS AND OFFICERS
 
    The  directors and executive officers of Cyanotech and their respective ages
and positions with Cyanotech are set forth in the following table.
 
<TABLE>
<CAPTION>
                   NAME                        AGE                      POSITION
- ------------------------------------------     ---     ------------------------------------------
Gerald R. Cysewski, Ph.D. ................     46      Chairman of the Board, President and Chief
                                                        Executive Officer
<S>                                         <C>        <C>
Ronald P. Scott...........................     41      Executive Vice President - Finance and
                                                        Administration, Secretary, Treasurer and
                                                        Director
Glenn Jensen..............................     37      Vice President - Operations
Kelly J. Moorhead.........................     40      Vice President - Sales and Marketing and
                                                        President, Nutrex, Inc.
Julian C. Baker...........................     29      Director
Eva R. Reichl.............................     77      Director
John T. Ushijima..........................     71      Director
Paul C. Yuen, Ph.D. ......................     67      Director
</TABLE>
 
    DR. CYSEWSKI co-founded the Company in 1983 and has served as a director  of
the  Company and as its  Scientific Director since that  time. Since March 1990,
Dr. Cysewski has served as President and Chief Executive Officer of the  Company
and in October 1990 was also appointed to the position of Chairman of the Board.
From 1988 to November 1990, he served as Vice Chairman of the Company. From 1980
to  1982 Dr. Cysewski was group leader of microalgae research and development at
Battelle Northwest, a major contract research and development firm. From 1976 to
1980 Dr. Cysewski was an assistant  professor in the Department of Chemical  and
Nuclear  Engineering at  the University of  California, Santa  Barbara, where he
received a two-year  grant from  the National  Science Foundation  to develop  a
culture  system for  blue-green algae.  Dr. Cysewski  received his  doctorate in
Chemical Engineering from the University of California at Berkeley.
 
    MR. SCOTT  was appointed  to the  Board  of Directors  of the  Company  (the
"Board")  in November 1995, has served as Executive Vice President - Finance and
Administration since  August 1995,  and has  served as  Secretary and  Treasurer
since November 1990 and June 1990, respectively. From December 1990 until August
1995  Mr.  Scott served  as Vice  President -  Finance and  Administration. From
September 1990 to December  1990, Mr. Scott served  as Controller. From 1989  to
1990,  he  was Assistant  Controller for  PRIAM  Corporation, a  manufacturer of
Winchester disk  drives. From  1980 to  1989, he  served in  various  accounting
management  positions with  Measurex Corporation,  a manufacturer  of industrial
process control systems. Mr. Scott holds a B.S. degree in Finance and Management
from California University, San Jose, and  an M.B.A. degree from the  University
of Santa Clara.
 
    MR.  JENSEN has  served as  Vice President -  Operations since  May 1993. He
joined the Company  in 1984 as  Process Manager and  was promoted to  Production
Manager  in  1991, in  which  position he  served  until his  promotion  to Vice
President - Operations. Prior to joining Cyanotech, Mr. Jensen worked for  three
years  as a  plant engineer  at a  Spirulina production  facility, Cal-Alga near
Fresno, California, which ceased to do business in 1983. Mr. Jensen holds a B.S.
degree in Health Science from California State University, Fresno.
 
    MR. MOORHEAD  has  served  as  Vice President  -  Sales  and  Marketing  and
President  of Nutrex,  Inc. since  December 1991.  From August  1987 to December
1991, he served as Vice President - Production. Mr. Moorhead joined the  Company
as  Production  Biologist  in December  1984.  Prior to  joining  Cyanotech, Mr.
Moorhead worked at the Oceanic Institute in Honolulu, Hawaii where he  conducted
research on production of Spirulina from agricultural wastes. Mr. Moorhead holds
a  B.S.  degree in  Aquatic  Biology from  the  University of  California, Santa
Barbara.
 
                                       37
<PAGE>
   
    MR. BAKER has served as a director  of the Company since November 1995.  Mr.
Baker  is a portfolio manager for Laurence A. Tisch and Preston R. Tisch and for
members of their family. Prior to his employment by the Tisch family, Mr.  Baker
was a member of The Clipper Group and its predecessors, CS First Boston Merchant
Bank  and  First Boston  Venture Capital.  Mr.  Baker is  a graduate  of Harvard
University. Laurence A. Tisch and Preston R. Tisch are Co-Chairmen and  Co-Chief
Executive  Officers  of  Loews  Corporation and  own  approximately  32%  of the
outstanding shares of that corporation. Loews Corporation owns approximately 84%
of  the  outstanding  shares  of   CNA  Financial  Corporation.  CNA   Financial
Corporation,  through a wholly owned subsidiary, is a significant stockholder of
Cyanotech. See "Principal Stockholders."
    
 
    MS. REICHL has served as a director of the Company since August 1993. She is
a private  investor who  has  been involved  in a  variety  of real  estate  and
fruit-growing operations in the states of Florida and Washington during the past
ten years.
 
    MR. USHIJIMA has served as a director of the Company since 1984. He has been
a  Partner in the  law firm of Ushijima  & Ushijima, Hilo,  Hawaii, for over ten
years. Mr. Ushijima is also a  former Hawaii State Senator and currently  serves
as a member of the Board of Regents for the University of Hawaii.
 
    DR. YUEN has served as a director of the Company since August 1993. Dr. Yuen
currently  serves as Dean, College of  Engineering, for the University of Hawaii
at Manoa. From July  1992 to March  1993, Dr. Yuen was  Acting President of  the
University  of  Hawaii. From  1989 to  1992,  Dr. Yuen  was Interim  Senior Vice
President for Academic Affairs,  University of Hawaii at  Manoa. Dr. Yuen  holds
M.S.  and Ph.D. degrees in Electrical Engineering from the Illinois Institute of
Technology.
 
    The Company's directors are elected at the annual stockholders' meeting  and
serve  until their respective successors are elected or until death, resignation
or removal.  Officers are  appointed by,  and serve  at the  discretion of,  the
Board.  There  are  no family  relationships  among any  directors  or executive
officers of the Company.
 
BOARD COMMITTEES
 
    The Board  has  an Audit  Committee  and  a Compensation  and  Stock  Option
Committee.  The Board does not have a standing nominating committee. The present
Audit Committee consists of Dr. Yuen,  Mr. Ushijima and Ms. Reichl. The  present
Compensation  and Stock Option Committee consists  of Dr. Yuen, Mr. Ushijima and
Ms. Reichl.
 
DIRECTOR COMPENSATION
 
    Each non-employee director  is entitled  to receive $500  per Board  meeting
attended  and is reimbursed  for all out-of-pocket  costs incurred in connection
with attendance at such meetings. In addition, each non-employee director (other
than Mr.  Baker)  has received,  pursuant  to the  Company's  1994  Non-Employee
Directors Stock Option and Stock Grant Plan (the "Non-Employee Directors Plan"),
options  to purchase  3,000 shares  of the Company's  Common Stock.  At the 1996
Annual Meeting  of  Stockholders,  Mr.  Baker and  any  other  new  non-employee
director  (in each case if continuing as a director) who has not received such a
grant will receive a 10-year option to purchase 3,000 shares. Each  non-employee
director  who  has received  such  an option  grant,  at each  subsequent annual
meeting of  stockholders,  received  or  will  receive  under  the  Non-Employee
Directors   Plan  an  automatic  grant  of   2,000  shares  of  fully  paid  and
non-assessable shares of Common Stock  that are non-transferable for six  months
following  the date of such grant. During  the fiscal year ended March 31, 1995,
each of the  director nominees  other than Mr.  Cysewski was  granted under  the
Non-Employee  Directors Plan  options to purchase  3,000 shares  of Common Stock
expiring in 2004 at $1.0625 per share, representing the fair market value of the
shares on the date of grant.
 
LIMITATION OF LIABILITY AND INDEMNIFICATION MATTERS
 
    The Company believes  that its  status as a  Nevada corporation  as well  as
certain  provisions of its Restated Articles of Incorporation and Bylaws will be
useful to attract and  retain qualified persons as  directors and officers.  The
Company's Restated Articles of Incorporation limit the liability of directors to
the  fullest extent permitted by Nevada law. This provision is intended to allow
the Company's directors  the benefit  of Nevada Corporation  Law which  provides
that directors of Nevada corporations may be relieved of
 
                                       38
<PAGE>
monetary  liabilities for breach of their  fiduciary duties as directors, except
under certain  circumstances,  including (i)  acts  or omissions  which  involve
intentional misconduct, fraud or a knowing violation of law, or (ii) the payment
of  unlawful distributions. The Company's Bylaws  provide that the Company shall
indemnify its officers and  directors to the fullest  extent provided by  Nevada
law.
 
    The  Company  has obtained  officer  and director  liability  insurance with
respect to liabilities arising out of certain matters, including matters arising
under the Securities Act.
 
    There is no pending litigation or proceeding involving a director,  officer,
associate  or other agent  of the Company  as to which  indemnification is being
sought, nor is the Company aware of any threatened litigation that may result in
claims for indemnification by any director, officer, associate or other agent.
 
EXECUTIVE COMPENSATION
 
  SUMMARY OF CASH AND OTHER COMPENSATION
 
    The following table sets forth the  aggregate cash compensation paid by  the
Company  for services  rendered during  the years  ended March  31, 1995 (fiscal
1995), March  31,  1994 (fiscal  1994)  and  December 31,  1992  (fiscal  1992),
respectively,  to the  Company's Chief  Executive Officer  (the "Named Executive
Officer"). No executive officer earned  over $100,000. No executive officer  who
would  have otherwise been includable  in this table on  the basis of salary and
bonus earned for fiscal 1995 has resigned or terminated employment.
 
                           SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                                           LONG-TERM
                                                                ANNUAL COMPENSATION   COMPENSATION AWARDS
                                                                                      -------------------
                                                                --------------------      SECURITIES
                                                                 SALARY      BONUS        UNDERLYING
           NAME AND PRINCIPAL POSITION             FISCAL YEAR     ($)        ($)       OPTIONS/SARS(#)
- -------------------------------------------------  -----------  ---------  ---------  -------------------
Gerald R. Cysewski                                       1995   $  86,809  $  10,000          11,000
<S>                                                <C>          <C>        <C>        <C>
  Chairman of the Board,                                 1994(1)    71,941    --              11,000
  President and Chief Executive Officer                  1992      69,000     --              --
</TABLE>
 
- ------------------------
 
(1) The  Company changed  its fiscal  year end  from December  31 to  March  31,
    effective March 31, 1994.
 
  STOCK OPTION GRANTS TO NAMED EXECUTIVE OFFICER
 
    The  following  table contains  information  concerning the  grant  of stock
options made by the Company  during the year ended March  31, 1995 to the  Named
Executive Officer.
 
                     OPTION/SAR GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                                              INDIVIDUAL GRANTS
                                                             ---------------------------------------------------
                                                              NUMBER OF     PERCENT OF
                                                              SECURITIES       TOTAL
                                                              UNDERLYING   OPTIONS/ SARS   EXERCISE
                                                               OPTIONS/     GRANTED TO     OR BASE
                                                                 SARS      EMPLOYEES IN     PRICE     EXPIRATION
                           NAME                              GRANTED (#)    FISCAL YEAR     ($/SH)       DATE
- -----------------------------------------------------------  ------------  -------------  ----------  ----------
<S>                                                          <C>           <C>            <C>         <C>
Gerald R. Cysewski (1).....................................     11,000         11.1%       $0.9375     6/30/99
</TABLE>
 
- ------------------------
 
(1)  The  options  become  exercisable  in  four  equal  and  cumulative  annual
    installments over  the  optionee's  period  of  service  with  the  Company,
    beginning one year after the June 30, 1994 grant date.
 
  OPTION EXERCISES AND HOLDINGS
 
    The following table provides information with respect to the Named Executive
Officer and certain other officers concerning the exercise of options during the
year  ended March 31, 1995 and unexercised options held as of March 31, 1995. No
stock appreciation rights were exercised during the year ended March 31, 1995 or
outstanding as of March 31, 1995.
 
                                       39
<PAGE>
            AGGREGATED OPTION/SAR EXERCISES IN LAST FISCAL YEAR AND
                            FY-END OPTION/SAR VALUES
 
<TABLE>
<CAPTION>
                                                                           NUMBER OF SECURITIES        VALUE OF UNEXERCISED
                                                                          UNDERLYING UNEXERCISED    IN-THE-MONEY OPTIONS/ SARS
                                                NUMBER OF               OPTIONS/SARS AT MARCH 31,
                                                  SHARES       VALUE               1995               AT MARCH 31, 1995 ($)
                                               ACQUIRED ON   REALIZED   --------------------------  --------------------------
                    NAME                       EXERCISE (#)     ($)     EXERCISABLE  UNEXERCISABLE  EXERCISABLE  UNEXERCISABLE
- ---------------------------------------------  ------------  ---------  -----------  -------------  -----------  -------------
<S>                                            <C>           <C>        <C>          <C>            <C>          <C>
Gerald R. Cysewski (1).......................       0            0           5,500        16,500             0     $   2,750
Ronald P. Scott (1)..........................       0            0          23,000        24,000         7,184         7,434
Glenn Jensen (1).............................       0            0          28,000        24,000         8,434         7,434
Kelly J. Moorhead (1)........................       0            0          34,000        25,000        10,308         8,058
</TABLE>
 
- ------------------------
(1) Since March 31, 1995,  the Company has granted  to Dr. Cysewski and  Messrs.
    Jensen,  Moorhead and Scott, options to  purchase 14,500, 12,000, 13,000 and
    14,500 shares of Common Stock, respectively. The options become  exercisable
    in  four equal and cumulative annual installments over the optionee's period
    of service with the  Company, beginning one year  after the August 10,  1995
    grant date.
 
STOCK OPTION PLAN
 
    The Board adopted, and the stockholders approved, the 1995 Stock Option Plan
(the  "Plan") in August  1995. The Plan  is the successor  plan to the Company's
1985 Incentive  Stock  Option Plan  (the  "Prior  Plan"). The  Plan  contains  a
discretionary  grant program  (the "Discretionary  Grant Program"),  under which
associates and consultants  may be  granted options  to purchase  shares of  the
Company's  Common Stock, and a discounted  option grant program (the "Discounted
Grant Program"), under  which associates may  elect to have  a portion of  their
base salary reduced each year in return for options to purchase shares of Common
Stock  at a discount from  current fair market value.  Options granted under the
Discretionary Grant  Program  may be  either  incentive stock  options  ("ISOs")
designed to meet the requirements of Section 422 of the Internal Revenue Code or
non-qualified   options  ("NQOs")  which  are   not  intended  to  satisfy  such
requirements. All grants under the Discounted Grant Program are NQOs.
 
    The Discretionary  Grant  Program  and  the  Discounted  Grant  Program  are
administered  by a committee (the "Committee") of two or more non-employee Board
members appointed  by the  Board, presently  the Compensation  and Stock  Option
Committee.  Under the  Plan, 400,000  shares of  the Company's  Common Stock are
reserved for issuance  over the  ten-year term of  the Plan.  Associates of  the
Company or its subsidiaries (including officers) and consultants are eligible to
participate  in the Plan.  As of December 31,  1995, approximately 35 associates
were eligible to participate in the Plan.
 
    The Committee may authorize loans or installment payments in order to assist
optionees  in  financing   the  exercise  of   outstanding  options  under   the
Discretionary  Grant  Program  or  Discounted  Grant  Program  on  terms  to  be
determined by the Committee. Any such financing may be subject to forgiveness in
whole or in part, at the discretion of the Committee, over the optionee's period
of service with the Company.  As of December 31,  1995, no loans or  installment
payments had been authorized.
 
    There  are  currently outstanding  options to  purchase 101,000  and 213,475
shares of Common Stock under the Plan  and the Prior Plan, respectively, with  a
weighted average exercise price per share of $2.32.
 
401(K) PLAN
 
    The  Company sponsors a 401(k) Plan (the "401(k) Plan") under which eligible
associates may contribute,  on a  pre-tax basis, up  to 15%  of the  associate's
total  annual income from the Company,  subject to certain Internal Revenue Code
limitations. Associates may contribute 50% of their profit-sharing bonus to  the
401(k)  Plan.  All contributions  are  allocated to  the  associate's individual
account and are subject to a six-year vesting schedule based on years of service
with the Company. All full-time associates who have attained age 18 are eligible
to participate in the 401(k) Plan. See "Business -- Associates."
 
                                       40
<PAGE>
                              CERTAIN TRANSACTIONS
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
    STOCKHOLDERS AGREEMENT.  In connection with the purchase by Eva R. Reichl in
1993  of  1,800,000 shares  of the  Company's Common  Stock, certain  holders of
Common Stock, including Gerald R. Cysewski (the "Holders"), the Company and  Ms.
Reichl  entered into  a Stockholders  Agreement dated  as of  May 17,  1993 (the
"Stockholders Agreement"). Under the Stockholders Agreement, the parties  agreed
that without approval of a majority of the Holders' and Ms. Reichl's shares, the
Company  would not propose, and  the Holders and Ms.  Reichl would not vote for,
any resolution, Bylaw change or other proposal that would increase the Company's
Board of  Directors  to more  than  six members.  In  addition, the  Company  is
obligated  under the  Stockholders Agreement to  notify Ms. Reichl  of any Board
elections so that she may nominate one person for election as a director. At any
Board election, the Holders and Ms. Reichl  have agreed to vote their shares  to
elect such nominee. The Stockholders Agreement terminates when Ms. Reichl sells,
transfers  or disposes of  any of the  1,800,000 shares acquired,  other than by
will, the laws of descent, or to any entity controlled by Ms. Reichl.
 
OTHER TRANSACTIONS
 
   
    SHARE CONVERSION AGREEMENT.   In February 1996, the  Company entered into  a
Preferred  Stock  Conversion and  Registration  Rights Agreement  with Firemen's
Insurance Company of Newark, New Jersey (an indirect wholly owned subsidiary  of
CNA  Financial Corporation) ("Firemen's Insurance"),  a principal stockholder of
the Company (the "Conversion  Agreement"), for the  conversion of the  Company's
Series  A Preferred Stock into  Common Stock effective upon  the closing of this
offering. Firemen's Insurance holds 1,250,000  shares of the Company's Series  A
Preferred  Stock (the "Series  A Shares"), constituting all  the Series A Shares
currently issued and  outstanding, which  shares were  convertible into  250,000
shares  of  Common Stock  until February  28, 1995.  Pursuant to  the Conversion
Agreement, Firemen's Insurance has  agreed to convert the  Series A Shares  into
250,000  shares  of  Common  Stock, which  conversion  ratio  was  determined in
accordance with  an  independent  valuation.  Firemen's  Insurance  has  agreed,
subject  to certain limited exceptions, not  to offer, sell or otherwise dispose
of, directly  or indirectly,  any  shares of  Common  Stock, or  any  securities
convertible  into  or exercisable  for, or  any rights  to purchase  or acquire,
Common Stock owned  by them  through the  date 120 days  after the  date of  the
closing  of this  offering. In  addition, the  Company has  granted to Firemen's
Insurance certain "piggy-back" registration rights with respect to the shares of
Common Stock issuable upon conversion of the  Series A Shares and the shares  of
Common  Stock issuable upon conversion of the Company's Series C Preferred Stock
held  by  Firemen's  Insurance.  See   "Shares  Eligible  for  Future  Sale   --
Registration Rights."
    
 
                                       41
<PAGE>
                             PRINCIPAL STOCKHOLDERS
 
    The   following  table  sets  forth  information  regarding  the  beneficial
ownership of the Company's Common Stock as of December 31, 1995 and as  adjusted
to  reflect the sale of shares of Common Stock offered hereby by (i) each person
who is known to the Company to own beneficially more than 5% of the  outstanding
shares  of the Common  Stock of the  Company, (ii) the  Named Executive Officer,
(iii) each director and (iv) all directors and executive officers as a group.
 
<TABLE>
<CAPTION>
                                                                                                PERCENTAGE OF SHARES
                                                                                                   OUTSTANDING(1)
                                                                                SHARES        ------------------------
NAME AND ADDRESS                                                             BENEFICIALLY       BEFORE        AFTER
OF BENEFICIAL OWNER                                                              OWNED         OFFERING     OFFERING
- -------------------------------------------------------------------------  -----------------  -----------  -----------
<S>                                                                        <C>                <C>          <C>
Gerald R. Cysewski, Ph.D. (2)............................................         473,308(3)         3.4%         3.1%
Ronald P. Scott (2)......................................................          34,750(4)           *            *
Julian C. Baker (2)......................................................              --(5)          --           --
Eva R. Reichl (2)........................................................       1,805,000           13.1         11.8
John T. Ushijima (2).....................................................         283,600(6)         2.1          1.9
Paul C. Yuen (2).........................................................          13,100(7)           *            *
B. Michael Pisani........................................................         855,573(8)         6.0          5.4
 44 Lake Road
 Short Hills, NJ 07078
CNA Financial Corporation................................................       3,408,641(9)        24.8         22.4
 CNA Plaza
 Chicago, IL 60685
American Cyanamid Company................................................         699,730(10)        5.1          4.6
 (a wholly-owned subsidiary of American Home Products Corporation)
 5 Giralda Farms
 Madison, NJ 07940
All directors and executive officers as a group (8 persons)(5)(11).......       2,670,658           19.3         17.4
</TABLE>
 
- --------------------------
 *  Less than 1.0%.
 
(1) Reflects the pro forma capitalization  of the Company at December 31,  1995,
    assuming  for all percentages  presented full conversion  of all outstanding
    shares of Series A Preferred Stock and Series C Preferred Stock into  shares
    of  Common  Stock (13,732,460  issued and  outstanding before  the offering;
    15,232,460 issued and outstanding after the offering). See "Capitalization."
    For  each  person,  also  assumes   as  outstanding  options  and   warrants
    exercisable by such person within 60 days of December 31, 1995.
 
(2)  Address is c/o  Cyanotech Corporation, 73-4460  Queen Kaahumanu Hwy., Suite
    102, Kailua-Kona, HI 96740.
 
(3) Includes options exercisable within 60 days of December 31, 1995 for  11,000
    shares of Common Stock.
 
(4)  Includes options exercisable within 60 days of December 31, 1995 for 22,250
    shares of Common Stock.
 
(5) Does  not include  250,000 shares  held by  Firemen's Insurance  Company  of
    Newark,  NJ  ("Firemen's Insurance"),  183,486  shares held  by National-Ben
    Franklin Company of Illinois ("National-Ben Franklin") and 2,975,155  shares
    of  Common  Stock issuable  upon conversion  of 595,031  shares of  Series C
    Preferred Stock  held by  Firemen's  Insurance. Mr.  Baker is  the  director
    nominee  (relating to the Series A  Preferred Stock which is being converted
    to Common  Stock  as of  the  closing of  this  offering) of  CNA  Financial
    Corporation,  the  parent company  of  Firemen's Insurance  and National-Ben
    Franklin, and disclaims beneficial ownership of such shares.
 
(6) Includes options exercisable within 60  days of December 31, 1995 for  3,000
    shares of Common Stock.
 
(7)  Includes options exercisable within 60 days  of December 31, 1995 for 3,000
    shares of Common Stock.
 
(8) Includes  warrants exercisable  within  60 days  of  December 31,  1995  for
    561,816 shares of Common Stock.
 
   
(9)  Represents 250,000 shares held by  Firemen's Insurance, 183,486 shares held
    by National-Ben Franklin and 2,975,155 shares of Common Stock issuable  upon
    conversion  of 595,031 shares of Series  C Preferred Stock held by Firemen's
    Insurance. National-Ben Franklin and Firemen's Insurance are indirect wholly
    owned subsidiaries of CNA  Financial Corporation. Firemen's Insurance  holds
    approximately 81.0% of the Series C Preferred Stock.
    
 
(10)  Represents  699,730 shares  of Common  Stock  issuable upon  conversion of
    139,946 shares of Series C Preferred Stock. American Cyanamid Company  holds
    approximately 19.0% of the Series C Preferred Stock.
 
(11)  Includes 85,250  shares issuable  under options  and warrants  to purchase
    shares of Common Stock exercisable within  60 days of December 31, 1995  to:
    Gerald  R.  Cysewski  (11,000 shares);  Ronald  P. Scott  (22,250);  John T.
    Ushijima (3,000  shares); Paul  C. Yuen  (3,000 shares);  and 46,000  shares
    issuable to other executive officers.
 
                                       42
<PAGE>
                          DESCRIPTION OF CAPITAL STOCK
 
    The authorized capital stock of the Company consists of 18,000,000 shares of
Common  Stock, $0.005 par value  per share, of which  9,807,575 shares of Common
Stock were issued  and outstanding as  of December 31,  1995 (10,057,575  shares
issued and outstanding, assuming full conversion of the Series A Preferred Stock
effective  on the closing  of this offering), and  5,000,000 shares of Preferred
Stock, $0.001 par  value per share,  734,977 shares of  which are designated  as
Series C Preferred Stock, and are currently issued and outstanding.
 
COMMON STOCK
 
    Subject  to  the  rights  of  holders of  Preferred  Stock,  the  holders of
outstanding shares of Common  Stock are entitled to  share ratably in  dividends
declared  out of  assets legally  available therefor  at such  time and  in such
amounts as the Board of Directors may from time to time lawfully determine. Each
holder of Common Stock is entitled to  one vote for each share held.  Cumulative
voting   in  elections  of  directors  and  all  other  matters  brought  before
stockholders meetings, whether they be annual or special, is not permitted.  The
Common  Stock is  not entitled  to conversion  or preemptive  rights and  is not
subject to redemption  or assessment. Subject  to the rights  of holders of  any
outstanding  Preferred Stock, upon liquidation, dissolution or winding up of the
Company, any assets legally available  for distribution to stockholders as  such
are to be distributed ratably among the holders of the Common Stock at that time
outstanding.  The Common  Stock presently outstanding  is, and  the Common Stock
issued in this offering will be, fully paid and nonassessable.
 
PREFERRED STOCK
 
    Preferred Stock  may  be  issued in  series  from  time to  time  with  such
designations,   relative   rights,   priorities,   preferences,  qualifications,
limitations and restrictions thereof, to the  extent that such are not fixed  in
the  Company's Restated Articles of Incorporation,  as the Board determines. The
rights,  preferences,  limitations  and  restrictions  of  different  series  of
Preferred  Stock may differ  with respect to dividend  rates, amounts payable on
liquidation, voting rights,  conversion rights,  redemption provisions,  sinking
fund  provisions  and other  matters. The  Board may  authorize the  issuance of
Preferred Stock  which ranks  senior to  the Common  Stock with  respect to  the
payment of dividends and the distribution of assets on liquidation. In addition,
the  Board is authorized to  fix the limitations and  restrictions, if any, upon
the payment of dividends  on Common Stock  to be effective  while any shares  of
Preferred  Stock are outstanding.  The Board, without  stockholder approval, can
issue Preferred Stock with  voting and conversion  rights which could  adversely
affect  the  voting  power of  the  holders  of Common  Stock.  The  issuance of
Preferred Stock  may have  the effect  of delaying,  deferring or  preventing  a
change in control of the Company.
 
    The  Company's 8% Cumulative, Convertible Preferred  Shares -- Series C (the
"Series C Shares")  are convertible at  the option of  the holders thereof  into
Common  Stock  at the  rate of  five shares  of  Common Stock  for one  share of
Preferred Stock  through February  23,  2000, after  which date  the  conversion
feature  is no longer applicable.  Holders of 21,030 Series  C Shares elected to
convert such shares into  105,150 shares of Common  Stock during the year  ended
March 31, 1995. Series C Shares have voting rights equal to the number of shares
of  Common  Stock into  which  they are  convertible  and have  a  preference in
liquidation over all other series of  preferred stock of five dollars per  share
plus  any  accumulated but  unpaid  dividends. Holders  of  Series C  Shares are
entitled to cumulative annual  dividends at the  rate of $.40  per share if  and
when  declared by the Board; cumulative dividends  in arrears as of December 31,
1995 amounted to $1.9  million ($2.563 per share).  Upon conversion of Series  C
Shares,  cumulative  dividends  in arrears  on  converted shares  are  no longer
payable. Each share of Series C Preferred Stock entitles holders to voting power
equal to the voting power of the number of shares of Common Stock into which the
shares of  Series  C Preferred  Stock  may be  converted.  Holders of  Series  C
Preferred  Stock are entitled to vote on  all matters on which holders of shares
of Common Stock are entitled  to vote. The consent of  holders of a majority  of
the outstanding Series C Shares is required to change the powers, preferences or
rights  of the Series C  Shares, sell all or  substantially all of the Company's
assets or merge the Company. The Series  C Shares were originally issued with  a
redemption  feature. Terms of the Series C Shares were modified in February 1991
to eliminate the redemption feature.
 
    The Company  has no  present intention  to issue  any additional  shares  of
Preferred Stock.
 
                                       43
<PAGE>
WARRANTS
 
    As  of December  31, 1995, the  Company had warrants  outstanding to acquire
997,000 shares  of the  Company's  Common Stock.  The  warrants were  issued  in
consideration  for loans to the Company, in consideration for and in recognition
of services performed, and to  certain individuals who guaranteed notes  payable
by the Company. Warrants granted for loans, services and guarantees were granted
with  exercise prices  not lower  than the  fair market  value of  the Company's
Common Stock on the date of grant. These outstanding warrants are exercisable at
prices ranging from $.40 to $1.00 per  share, with a weighted average price  per
share of $.458, and expire on various dates from 1996 to 1999.
 
NEVADA ANTI-TAKEOVER LAWS AND CERTAIN CHARTER PROVISIONS
 
   
    Nevada's  "Combination with Interested Stockholders Statute," Nevada Revised
Statutes 78.411-78.444, which applies to Nevada corporations having at least 200
stockholders,  prohibits  an  "interested  stockholder"  from  entering  into  a
"combination"  with  the  corporation,  unless  certain  conditions  are  met. A
"combination" includes (a) any merger  with an "interested stockholder," or  any
other  corporation  which is  or  after the  merger  would be,  an  affiliate or
associate  of  the  interested  stockholder,  (b)  any  sale,  lease,  exchange,
mortgage, pledge, transfer or other disposition of assets, in one transaction or
a  series  of  transactions,  to  an  "interested  stockholder,"  having  (i) an
aggregate market value equal to 5% or more of the aggregate market value of  the
corporation's  assets, (ii) an aggregate market value equal to 5% or more of the
aggregate market value of  all outstanding shares of  the corporation, or  (iii)
representing  10% or more of the earning power or net income of the corporation,
(c) any issuance or transfer of  shares of the corporation or its  subsidiaries,
to the "interested stockholder," having an aggregate market value equal to 5% or
more  of  the  aggregate market  value  of  all the  outstanding  shares  of the
corporation, (d) the  adoption of any  plan or proposal  for the liquidation  or
dissolution  of the  corporation proposed  by the  "interested stockholder," (e)
certain transactions which would have the effect of increasing the proportionate
share of  outstanding  shares  of  the  corporation  owned  by  the  "interested
stockholder,"  or  (f)  the receipt  of  benefits, except  proportionately  as a
stockholder,  of  any  loans,  advances  or  other  financial  benefits  by   an
"interested  stockholder."  An  "interested  stockholder" is  a  person  who (i)
directly or indirectly owns 10% or more  of the voting power of the  outstanding
voting  shares  of the  corporation or  (ii)  an affiliate  or associate  of the
corporation which at any time within three years before the date in question was
the beneficial owner, directly or indirectly, of 10% or more of the voting power
of the then outstanding shares of the corporation.
    
 
    A corporation to which the statute applies may not engage in a "combination"
within three years after the interested stockholder acquired its shares,  unless
the  combination  or  the  interested stockholder's  acquisition  of  shares was
approved by the board  of directors before  the interested stockholder  acquired
the  shares. If this approval was not obtained, then after the three-year period
expires, the  combination may  be consummated  if all  the requirements  in  the
Articles  of Incorporation are met and either  (a) (i) the board of directors of
the  corporation  approves,  prior  to  such  person  becoming  an   "interested
stockholder,"  the  combination or  the purchase  of  shares by  the "interested
stockholder" or (ii)  the combination  is approved  by the  affirmative vote  of
holders  of a majority of voting power not beneficially owned by the "interested
stockholder" at a meeting called no earlier than three years after the date  the
"interested stockholder" became such or (b) the aggregate amount of cash and the
market  value of  consideration other  than cash  to be  received by  holders of
common shares and  holders of  any other  class or  series of  shares meets  the
minimum requirements set forth in Sections 78.411 through 78.443, inclusive, and
prior  to the consummation of the  combination, except in limited circumstances,
the "interested  stockholder"  will not  have  become the  beneficial  owner  of
additional voting shares of the corporation.
 
   
    Nevada's   "Control  Share  Acquisition  Statute,"  Nevada  Revised  Statute
SectionSection78.378-78.379, prohibits an acquiror, under certain circumstances,
from voting  shares  of a  target  corporation's stock  after  crossing  certain
threshold ownership percentages, unless the acquiror obtains the approval of the
target  corporation's stockholders.  The Control Share  Acquisition Statute only
applies to  Nevada corporations  with at  least 200  stockholders, including  at
least  100 record stockholders  who are Nevada residents,  and which do business
directly or indirectly in Nevada. The  Company does not intend to "do  business"
in  Nevada  within  the  meaning  of  the  Control  Share  Acquisition  Statute.
Therefore, it is unlikely that the Control Share Acquisition Statute will  apply
to  the Company. The statute specifies  three thresholds: at least one-fifth but
less than one-third, at least one-third but less than a majority, and a majority
or more, of all the  outstanding voting power. Once  an acquiror crosses one  of
the   above   thresholds,  shares   which   it  acquired   in   the  transaction
    
 
                                       44
<PAGE>
taking it over the threshold or within ninety days become "Control Shares" which
are deprived  of  the  right to  vote  until  a majority  of  the  disinterested
stockholders  restore that right. A special  stockholders' meeting may be called
at the request of the acquiror to  consider the voting rights of the  acquiror's
shares  no more than 50 days (unless the  acquiror agrees to a later date) after
the delivery by  the acquiror  to the  corporation of  an information  statement
which  sets forth the  range of voting  power that the  acquiror has acquired or
proposes to acquire and  certain other information  concerning the acquiror  and
the  proposed control share acquisition. If  no such request for a stockholders'
meeting is made,  consideration of the  voting rights of  the acquiror's  shares
must  be  taken at  the next  special  or annual  stockholders' meeting.  If the
stockholders fail to restore  voting rights to the  acquiror or if the  acquiror
fails  to timely deliver  an information statement to  the corporation, then the
corporation may, if so provided in its articles of incorporation or bylaws, call
certain of the acquiror's shares for redemption. The Company's Restated Articles
of Incorporation and  Bylaws do not  currently permit it  to call an  acquiror's
shares  for redemption under these  circumstances. The Control Share Acquisition
Statute also  provides  that  the stockholders  who  do  not vote  in  favor  of
restoring  voting rights to the Control Shares  may demand payment for the "fair
value" of their shares (which  is generally equal to  the highest price paid  in
the transaction subjecting the stockholder to the statute).
 
    The  provisions described above,  together with the ability  of the Board of
Directors to issue  Preferred Stock  as described under  "Preferred Stock,"  may
have  the effect of delaying or deterring  a change in the control or management
of the Company. See "Risk Factors -- Effect of Anti-Takeover Provisions."
 
LISTING
 
    The Company's Common Stock is currently quoted on the Nasdaq National Market
under the symbol "CYAN."
 
TRANSFER AGENT AND REGISTRAR
 
    First Interstate  Bank of  Washington, N.A.  is the  registrar and  transfer
agent of the Company's Common Stock.
 
                        SHARES ELIGIBLE FOR FUTURE SALE
 
GENERAL
 
    Upon  completion  of  this  offering,  the  Company  will  have  outstanding
approximately 15.2 million shares  of Common Stock,  assuming the conversion  of
all  the outstanding shares of Preferred Stock into Common Stock, no exercise of
the Underwriters' over-allotment option and  no exercise of options or  warrants
to purchase the Company's Common Stock. Of these shares, all of the Common Stock
being  sold  hereby  and  approximately  5.5  million  shares  held  by existing
stockholders will  be  freely tradeable  (unless  such  shares are  held  by  an
"affiliate"  of  the Company  as such  term  is defined  in the  Securities Act)
without restriction or registration under the Securities Act. The remaining  8.3
million  shares  were issued  and sold  by the  Company in  private transactions
("Restricted Shares") and are eligible for public sale only if registered  under
the Securities Act or sold in accordance with Rule 144 thereunder. Approximately
1.1  million of  the Restricted  Shares are currently  eligible for  sale in the
public market pursuant to Rule 144(k) (of which approximately 870,000 shares are
subject to  the  agreements not  to  sell described  below).  Approximately  7.2
million  additional Restricted Shares  will be eligible for  sale in reliance on
Rule 144 (of which approximately 6.6  million are subject to the agreements  not
to  sell described below). The directors, executive officers and stockholders of
the Company who  hold in  the aggregate  approximately 7.5  million shares  have
agreed,  subject to certain limited exceptions,  not to offer, sell or otherwise
dispose of,  directly  or  indirectly,  any  shares  of  Common  Stock,  or  any
securities  convertible into  or exercisable for,  or any rights  to purchase or
acquire, Common Stock owned by them for the 120-day period after the closing  of
this  offering without  the prior  written consent of  Van Kasper  & Company. In
addition, the Company has agreed that for a period of 120 days after the date of
this Prospectus, it will not, without the prior written consent of Van Kasper  &
Company,  issue, offer, sell, grant options  to purchase or otherwise dispose of
any equity securities or securities convertible into or exchangeable for  equity
securities  except for (i) shares of Common Stock offered hereby, (ii) shares of
Common Stock  issued  pursuant  to  the  exercise  of  outstanding  options  and
warrants,  (iii) shares  of Common  Stock issued  pursuant to  the conversion of
Preferred Stock and (iv) options granted to its associates, officers,  directors
and  consultants so long as none of  such options become exercisable during said
120-day period. Van Kasper & Company may, in its sole discretion and at any time
 
                                       45
<PAGE>
without notice, release  all or  any portion of  the securities  subject to  the
lock-up  agreements. No predictions can  be made as to  the effect, if any, that
market sales of Common Stock or the  availability of Common Stock for sale  will
have  on the market  price prevailing from  time to time.  Sale of a substantial
number of shares of  Common Stock in the  public market following this  offering
could  adversely affect the market price of  the Common Stock. See "Risk Factors
- -- Shares Eligible for Future Sale."
 
    In general, under Rule 144 as currently in effect, any holder of  Restricted
Shares,  including an affiliate of  the Company, as to  which at least two years
have elapsed since the later of the  date of their acquisition from the  Company
or  an affiliate,  would be  entitled within  any three-month  period to  sell a
number of  shares that  does  not exceed  the  greater of  (i)  1% of  the  then
outstanding  shares of  Common Stock  (approximately 115,000  shares immediately
after the completion of this offering assuming no exercise of the  Underwriters'
over-allotment  option  and assuming  no conversion  of  the Series  C Preferred
Stock) or (ii)  the average weekly  trading volume  of the Common  Stock in  the
over-the-counter market during the four calendar weeks immediately preceding the
date on which notice of the sale is filed with the Commission. Sales pursuant to
Rule  144 are also subject  to certain other requirements  relating to manner of
sale, notice and availability of current public information about the Company. A
person (or persons whose shares are aggregated)  who is not deemed to have  been
an  affiliate of  the Company  at any time  during the  three months immediately
preceding the sale, and  who, together with  any previous holder  who is not  an
affiliate  of the Company, has beneficially owned Restricted Shares for at least
three years, would  be entitled to  sell such shares  under Rule 144(k)  without
regard to the limitations described above. The foregoing summary is not intended
to be a complete description of Rule 144.
 
    The  Company has reserved 400,000 shares  of Common Stock for issuance under
the 1995 Stock  Option Plan, options  to purchase 101,000  shares of which  have
been  granted.  The Company  also has  outstanding  options to  purchase 213,475
shares, which options were granted under  the 1985 Incentive Stock Option  Plan.
In  addition, the Company has options outstanding to purchase 9,000 shares under
the 1994 Non-Employee  Directors Stock  Option and  Stock Grant  Plan and  other
non-qualified  options outstanding to  purchase 102,000 shares  of Common Stock.
The Company has filed registration statements under the Securities Act  covering
an  aggregate of 800,000 shares  of Common Stock under  the Company's 1995 Stock
Option Plan  and  1985 Incentive  Stock  Option  Plan. Shares  issued  upon  the
exercise  of stock options  or previously issued on  exercise, generally will be
available for sale  in the open  market subject to  Rule 144 volume  limitations
applicable  to affiliates and  the lock-up agreements with  Van Kasper & Company
described above.
 
REGISTRATION RIGHTS
 
    In connection with a  Joint Venture Agreement  consummated August 31,  1994,
between  Hauser  Chemical  Research,  Inc. ("Hauser")  and  the  Company, Hauser
purchased 96,969 shares of  the Company's Common Stock  and the Company  granted
certain  demand  and "piggy-back"  registration  rights to  Hauser  covering the
96,969 shares of Common Stock pursuant to a Registration Rights Agreement  dated
as  of August  31, 1994.  Under the  agreement, Hauser  may, subject  to certain
limitations, require the Company to register  shares of such Common Stock  under
the  Securities Act to enable it to sell such shares to the public. In addition,
whenever the  Company proposes  to  register any  of  its securities  under  the
Securities  Act (other than registrations in  connection with stock option plans
and certain other  registrations), Hauser  may require the  Company, subject  to
certain  limitations, to  include all  or any portion  of such  shares of Common
Stock in the registration. The Company  generally is required to bear all  costs
incurred   in  connection   with  the  "piggy-back"   registrations  other  than
underwriting discounts and commissions payable with respect to the Common  Stock
and  fees of counsel to the holders of the Common Stock, and Hauser is generally
required to bear all costs incurred in connection with the demand registrations.
Hauser has agreed, subject to certain limited exceptions, not to offer, sell  or
otherwise dispose of, directly or indirectly, any shares of Common Stock, or any
securities  convertible into  or exercisable for,  or any rights  to purchase or
acquire, Common Stock owned by them through the date 120 days after the date  of
the closing of this offering.
 
    The Company has granted to Firemen's Insurance and American Cyanamid certain
"piggy-back"  registration rights  with respect  to the  shares of  Common Stock
issuable upon  conversion  of the  Series  A Shares  and  the Series  C  Shares,
amounting to 3,924,885 shares of Common Stock on an as-converted basis. Whenever
the  Company proposes to register any of its securities under the Securities Act
in connection with the public offering of such securities solely for cash (other
than registrations  in connection  with  stock option  plans and  certain  other
registrations),  Firemen's  Insurance  and  American  Cyanamid  may  require the
 
                                       46
<PAGE>
Company, subject to certain  limitations, to include all  or any portion of  the
Common Stock acquired pursuant to the conversion of Series A Shares and Series C
Shares  in such registration. The Company has agreed to register for sale in any
future offering until February 3, 2005 a minimum of the greater of (i)  American
Cyanamid's  or Firemen's Insurance (as the case  may be) pro rata portion of not
less than 40% of the total number of securities to be registered in any offering
with respect to  all security  holders with piggy-back  registration rights  and
(ii)  110,000 of American Cyanamid's shares  or 507,000 of Firemen's Insurance's
shares (as the case may be). American Cyanamid and Firemen's Insurance also have
certain rights to withdraw their election to sell in any such offering prior  to
the  effectiveness of  the registration  statement related  thereto. The Company
generally is required  to bear all  costs incurred in  connection with all  such
registrations  other than  underwriting discounts  and commissions  payable with
respect to the Common  Stock and fees  of counsel to the  holders of the  Common
Stock.  In  connection  with  and  in  consideration  of  the  granting  of such
registration rights,  Firemen's Insurance  and  American Cyanamid  have  agreed,
subject  to certain limited exceptions, not  to offer, sell or otherwise dispose
of, directly  or indirectly,  any  shares of  Common  Stock, or  any  securities
convertible  into  or exercisable  for, or  any rights  to purchase  or acquire,
Common Stock owned  by them  through the  date 120 days  after the  date of  the
closing of this offering. See "Certain Transactions -- Other Transactions."
 
                                       47
<PAGE>
                                  UNDERWRITING
 
    Subject  to  the terms  and conditions  of  the Underwriting  Agreement, the
Underwriters named below,  through their  representative, Van  Kasper &  Company
(the  "Representative"), have severally agreed to  purchase from the Company the
number of shares of Common Stock set forth opposite their names below:
 
   
<TABLE>
<CAPTION>
                                                                               NUMBER OF
NAME                                                                             SHARES
- -----------------------------------------------------------------------------  ----------
<S>                                                                            <C>
Van Kasper & Company.........................................................     980,000
A.G. Edwards & Sons, Inc.....................................................      65,000
Hambrecht & Quist LLC........................................................      65,000
Adams, Harkness & Hill, Inc..................................................      30,000
Furman Selz Incorporated.....................................................      30,000
Janney Montgomery Scott Inc..................................................      30,000
Jefferies & Company, Inc.....................................................      30,000
Josephthal Lyon & Ross Incorporated..........................................      30,000
National Securities Corp.....................................................      30,000
Needham & Company, Inc.......................................................      30,000
Offerman & Company...........................................................      30,000
Rauscher Pierce Refsnes, Inc.................................................      30,000
Raymond James & Associates, Inc..............................................      30,000
Sutro & Co. Incorporated.....................................................      30,000
Unterberg Harris.............................................................      30,000
Vector Securities International, Inc.........................................      30,000
                                                                               ----------
Total........................................................................   1,500,000
                                                                               ----------
                                                                               ----------
</TABLE>
    
 
    The Underwriting Agreement provides that the obligations of the Underwriters
are subject  to certain  conditions precedent,  and that  the underwriters  will
purchase  all shares of  Common Stock offered  hereby if any  of such shares are
purchased.
 
   
    The Underwriters propose to offer the Common Stock directly to the public at
the offering price set forth on the cover page of this Prospectus and to certain
selected dealers at  this price less  a concession  not in excess  of $0.28  per
share.  The Underwriters may allow and such dealers may reallow a concession not
in excess of $0.10 per share to certain other dealers.
    
 
    The Company has granted  an option to the  Underwriters, exercisable by  the
Representative  within 30 days after the date of this Prospectus, to purchase up
to 225,000 additional shares of Common Stock at the initial offering price, less
underwriting discounts  and commissions.  The  Representative may  exercise  the
over-allotment  option solely  for the  purpose of  covering over-allotments, if
any, incurred in the sale of the  shares of Common Stock offered hereby. To  the
extent  that the  over-allotment option is  exercised, each  of the Underwriters
will have a firm commitment to purchase approximately the same percentage of the
additional shares as the number  of shares to be  purchased and offered by  that
Underwriter in the above table bears to the total.
 
    The  Company  has  agreed  to  indemnify  the  Underwriters  against certain
liabilities, including liabilities under the Securities Act. The  Representative
has informed the Company that the Underwriters do not intend to confirm sales to
accounts over which they exercise discretionary authority.
 
    Certain  stockholders,  representing in  the  aggregate 7,460,748  shares of
Common Stock (assuming conversion of the Company's Series C Preferred Stock) and
the holders of  options to purchase  85,250 shares of  Common Stock have  agreed
pursuant  to such lock-up agreements, subject to certain limited exceptions, not
to offer, sell or  otherwise dispose of, directly  or indirectly, any shares  of
Common  Stock, or  any securities  convertible into  or exercisable  for, or any
rights to purchase or acquire, Common Stock owned by them for the 120-day period
after the closing  of this  offering without the  prior written  consent of  the
Representative.  The Representative may, in its  sole discretion and at any time
without notice, release all  or any portion of  the securities subject to  these
lock-up agreements. In addition, the Company has agreed that for a period of 120
 
                                       48
<PAGE>
days  after the date of this Prospectus,  it will not, without the prior written
consent of the Representative, issue, offer, sell, grant options to purchase  or
otherwise  dispose of  any equity securities  or securities  convertible into or
exchangeable for equity securities except for (i) shares of Common Stock offered
hereby, (ii)  shares  of  Common  Stock  issued  pursuant  to  the  exercise  of
outstanding  options and warrants, (iii) shares  of Common Stock issued pursuant
to the conversion of Preferred Stock and (iv) options granted to its associates,
officers, directors  and consultants  so long  as none  of such  options  become
exercisable during said 120-day period. Sales of such shares in the future could
adversely  affect the market price of the Common Stock. See "Shares Eligible for
Future Sale."
 
    The Company has agreed to  pay the Representative a non-accountable  expense
allowance of 1.0% of the total proceeds of the offering.
 
                                 LEGAL MATTERS
 
    Certain  legal  matters with  respect to  the validity  of the  Common Stock
offered hereby will be passed upon for the Company by Woodburn and Wedge,  Reno,
Nevada.  Certain legal matters  in connection with this  offering will be passed
upon for  the  Company  by  Brobeck, Phleger  &  Harrison  LLP,  San  Francisco,
California.  Certain  legal matters  in connection  with  this offering  will be
passed upon for the Underwriters by Heller Ehrman White & McAuliffe, Palo  Alto,
California.
 
                                    EXPERTS
 
    The  consolidated  financial  statements of  Cyanotech  Corporation  and its
subsidiary as of March 31, 1995 and March 31, 1994, and for each of the years in
the two-year period ended March 31, 1995,  have been included herein and in  the
Registration  Statement  in reliance  on the  report of  KPMG Peat  Marwick LLP,
independent certified public accountants, and upon the authority of said firm as
experts in accounting and auditing.
 
                             AVAILABLE INFORMATION
 
    Cyanotech is  subject  to  the  reporting  requirements  of  the  Securities
Exchange  Act  of  1934, as  amended  (the  "Exchange Act"),  and  in accordance
therewith, files  annual  and  quarterly reports,  proxy  statements  and  other
information  with the Securities and Exchange Commission (the "Commission"). The
Company has filed a registration statement  on Form SB-2 (herein, together  with
all  amendments and exhibits  referred to as  the "Registration Statement") with
the Commission under  the Securities Act  of 1933, as  amended (the  "Securities
Act").  This Prospectus, which constitutes a part of the Registration Statement,
does not contain all of the information, exhibits and schedules set forth in the
Registration Statement, certain parts  of which are  omitted in accordance  with
the  rules  and  regulations of  the  Commission. For  further  information with
respect to the Company  and the Common  Stock, reference is  hereby made to  the
Registration  Statement, exhibits and schedules thereto. Statements contained in
this Prospectus  as  to the  contents  of any  contract  or any  other  document
referred to are not necessarily complete and, in each instance, if such contract
or  document is filed as an exhibit  to the Registration Statement, reference is
made to  the copy  of such  contract  or document  filed as  an exhibit  to  the
Registration  Statement, and each such statement being qualified in all respects
by such reference to  such exhibit. Copies of  such materials may be  inspected,
without  charge, at  the offices  of the  Commission, or  obtained at prescribed
rates from  the  Public  Reference  Section of  the  Commission  at  Room  1024,
Judiciary  Plaza, 450  Fifth Street,  N.W., Washington,  D.C. 20549,  and at the
Commission's regional  offices  located at  Citicorp  Center, 500  West  Madison
Street,  Suite 1400,  Chicago, Illinois  60661 and  at Seven  World Trade Center
(13th Floor), New York, New York 10019. The Company's Common Stock is quoted  on
the  Nasdaq  National Market.  Reports, proxy  statements and  other information
concerning the Company  may also  be inspected  at the  National Association  of
Securities Dealers, Inc. at 1735 K Street, N.W., Washington, D.C. 20006.
 
                                       49
<PAGE>
                             CYANOTECH CORPORATION
                         INDEX TO FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                                                               PAGE
                                                                                                             ---------
<S>                                                                                                          <C>
Independent Auditors' Report...............................................................................        F-2
Consolidated Balance Sheets at March 31, 1994 and 1995 and at December 31, 1995 (unaudited)................        F-3
Consolidated Statements of Income for the Years Ended March 31, 1994 and 1995 and for the Nine Months Ended
 December 31, 1994 and 1995 (unaudited)....................................................................        F-4
Consolidated Statements of Stockholders' Equity for the Years Ended March 31, 1994 and 1995 and the Nine
 Months Ended December 31, 1995 (unaudited)................................................................        F-5
Consolidated Statements of Cash Flows for the Years Ended March 31, 1994 and 1995 and for the Nine Months
 Ended December 31, 1994 and 1995 (unaudited)..............................................................        F-6
Notes to Consolidated Financial Statements.................................................................        F-7
</TABLE>
 
                                      F-1
<PAGE>
                          INDEPENDENT AUDITORS' REPORT
 
Board of Directors and Stockholders
Cyanotech Corporation:
 
    We  have audited the  accompanying consolidated balance  sheets of Cyanotech
Corporation and  subsidiary as  of March  31,  1995 and  1994, and  the  related
consolidated  statements of income, stockholders' equity  and cash flows for the
years then ended. These consolidated financial statements are the responsibility
of the Company's  management. Our  responsibility is  to express  an opinion  on
these consolidated financial statements based on our audits.
 
    We  conducted  our audits  in  accordance with  generally  accepted auditing
standards. Those standards require that we plan and perform the audit to  obtain
reasonable assurance about whether the financial statements are free of material
misstatement.  An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statements. An audit also  includes
assessing  the  accounting principles  used  and significant  estimates  made by
management, as well as evaluating the overall financial statement  presentation.
We believe that our audits provide a reasonable basis for our opinion.
 
    In  our  opinion, the  consolidated financial  statements referred  to above
present fairly, in all  material respects, the  financial position of  Cyanotech
Corporation  and subsidiary as  of March 31,  1995 and 1994,  and the results of
their operations and  their cash flows  for the years  then ended in  conformity
with generally accepted accounting principles.
 
KPMG Peat Marwick LLP
 
Honolulu, Hawaii
May 3, 1995
 
                                      F-2
<PAGE>
                             CYANOTECH CORPORATION
                          CONSOLIDATED BALANCE SHEETS
                 MARCH 31, 1994 AND 1995 AND DECEMBER 31, 1995
                       (IN THOUSANDS, EXCEPT SHARE DATA)
                                ASSETS (NOTE 4)
<TABLE>
<CAPTION>
                                                                                       MARCH 31,
                                                                                  --------------------  DECEMBER 31,
                                                                                    1994       1995         1995
                                                                                  ---------  ---------  -------------
<S>                                                                               <C>        <C>        <C>
                                                                                                         (UNAUDITED)
CURRENT ASSETS:
  Cash and cash equivalents.....................................................  $     866  $     496    $     776
  Accounts receivable...........................................................        462        648        1,291
  Inventories (note 2)..........................................................        398        375          275
  Prepaid expenses..............................................................          7          5           32
                                                                                  ---------  ---------       ------
    Total current assets........................................................      1,733      1,524        2,374
Equipment and leasehold improvements, net (note 3)..............................      3,365      4,635        7,204
Other assets....................................................................         34         53           71
                                                                                  ---------  ---------       ------
    Total assets................................................................  $   5,132  $   6,212    $   9,649
                                                                                  ---------  ---------       ------
                                                                                  ---------  ---------       ------
 
<CAPTION>
 
                                        LIABILITIES AND STOCKHOLDERS' EQUITY
<S>                                                                               <C>        <C>        <C>
 
CURRENT LIABILITIES:
  Current maturities of long-term debt (note 4).................................  $      13  $       7    $     175
  Current maturities of capital lease obligations (note 5)......................         26         58          123
  Accounts payable..............................................................        566        629          700
  Accrued expenses and other (note 7)...........................................        258        230          372
                                                                                  ---------  ---------       ------
    Total current liabilities...................................................        863        924        1,370
Long-term debt, excluding current maturities (note 4)...........................          7     --              550
Obligations under capital lease, excluding current maturities (note 5)..........        102        184          358
                                                                                  ---------  ---------       ------
    TOTAL LIABILITIES...........................................................        972      1,108        2,278
                                                                                  ---------  ---------       ------
STOCKHOLDERS' EQUITY:
  Preferred stock (note 8)......................................................          2          2            2
  Common stock of $.005 par value; authorized 18,000,000 shares; outstanding
   8,736,506 shares at March 31, 1994, 9,051,325 shares at March 31, 1995 and
   9,807,575 shares at December 31, 1995........................................         44         45           49
  Additional paid-in capital....................................................     12,042     12,216       12,720
  Accumulated deficit...........................................................     (7,898)    (7,129)      (5,400)
                                                                                  ---------  ---------       ------
                                                                                      4,190      5,134        7,371
  Less -- treasury stock, 30,000 common shares at cost..........................         30         30       --
                                                                                  ---------  ---------       ------
    Total stockholders' equity..................................................      4,160      5,104        7,371
                                                                                  ---------  ---------       ------
Commitments and contingencies (notes 5, 8 and 12)
    Total liabilities and stockholders' equity..................................  $   5,132  $   6,212    $   9,649
                                                                                  ---------  ---------       ------
                                                                                  ---------  ---------       ------
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-3
<PAGE>
   
                             CYANOTECH CORPORATION
                       CONSOLIDATED STATEMENTS OF INCOME
                    YEARS ENDED MARCH 31, 1994 AND 1995 AND
                  NINE MONTHS ENDED DECEMBER 31, 1994 AND 1995
                     (IN THOUSANDS, EXCEPT PER SHARE DATA)
    
 
<TABLE>
<CAPTION>
                                                                    YEAR ENDED MARCH 31,     NINE MONTHS ENDED
                                                                                                DECEMBER 31,
                                                                    --------------------  ------------------------
                                                                      1994       1995        1994         1995
                                                                    ---------  ---------  -----------  -----------
<S>                                                                 <C>        <C>        <C>          <C>
                                                                                          (UNAUDITED)  (UNAUDITED)
NET SALES (note 10)...............................................  $   2,697  $   4,150   $   2,921    $   5,972
COST OF SALES.....................................................      1,495      2,275       1,582        2,784
                                                                    ---------  ---------  -----------  -----------
    GROSS PROFIT..................................................      1,202      1,875       1,339        3,188
                                                                    ---------  ---------  -----------  -----------
OPERATING EXPENSES:
  Research and development........................................         59        171          93          243
  General and administrative......................................        604        685         504          862
  Sales and marketing.............................................        319        301         208          302
                                                                    ---------  ---------  -----------  -----------
    Total operating expenses......................................        982      1,157         805        1,407
                                                                    ---------  ---------  -----------  -----------
    Income from operations........................................        220        718         534        1,781
                                                                    ---------  ---------  -----------  -----------
OTHER INCOME (EXPENSE):
  Interest income.................................................         13         17          12           19
  Interest expense................................................        (16)       (27)        (19)         (63)
  Other income, net...............................................         22         98          13       --
  Proportionate share of loss of joint venture (note 6)...........        (35)       (37)        (37)      --
                                                                    ---------  ---------  -----------  -----------
    Total other income (expense)..................................        (16)        51         (31)         (44)
                                                                    ---------  ---------  -----------  -----------
    Net income before income taxes................................        204        769         503        1,737
Provision for income taxes........................................     --         --          --               (8)
                                                                    ---------  ---------  -----------  -----------
NET INCOME........................................................  $     204  $     769   $     503    $   1,729
                                                                    ---------  ---------  -----------  -----------
                                                                    ---------  ---------  -----------  -----------
NET INCOME PER COMMON SHARE.......................................  $    0.02  $    0.05   $    0.04    $    0.12
                                                                    ---------  ---------  -----------  -----------
                                                                    ---------  ---------  -----------  -----------
Weighted average number of common shares and common share
 equivalents......................................................     13,330     13,589      13,907       14,452
                                                                    ---------  ---------  -----------  -----------
                                                                    ---------  ---------  -----------  -----------
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-4
<PAGE>
                             CYANOTECH CORPORATION
                CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
                      YEARS ENDED MARCH 31, 1994 AND 1995
              AND NINE MONTHS ENDED DECEMBER 31, 1995 (UNAUDITED)
                       (IN THOUSANDS, EXCEPT SHARE DATA)
<TABLE>
<CAPTION>
                                      PREFERRED STOCK
                                          (NOTE 8)            COMMON STOCK      ADDITIONAL
                                    --------------------  --------------------    PAID-IN     ACCUMULATED    TREASURY
                                     SHARES    PAR VALUE   SHARES    PAR VALUE    CAPITAL       DEFICIT        STOCK
                                    ---------  ---------  ---------  ---------  -----------  -------------  -----------
<S>                                 <C>        <C>        <C>        <C>        <C>          <C>            <C>
BALANCES AT MARCH 31, 1993........  2,118,507  $       2  6,260,197  $      31   $   9,665     $  (8,102)    $     (30)
Common stock issued for cash, net
 of costs of $24..................     --         --      2,350,000         12       2,314        --            --
Exercise of warrants for cash.....     --         --         83,000          1          37        --            --
Exercise of stock options for
 cash.............................     --         --          3,300     --               2        --            --
Common stock issued in
 satisfaction of debt.............     --         --         40,000     --              24        --            --
Other.............................     --         --              9     --          --            --            --
Net income........................     --         --         --         --          --               204        --
                                    ---------  ---------  ---------  ---------  -----------  -------------       -----
BALANCES AT MARCH 31, 1994........  2,118,507          2  8,736,506         44      12,042        (7,898)          (30)
Common stock issued for cash, net
 of costs of $6...................     --         --        146,969          1         144        --            --
Exercise of warrants for cash.....     --         --         38,400     --              24        --            --
Exercise of stock options for
 cash.............................     --         --          4,300     --               3        --            --
Conversion of 21,030 shares of
 Series C preferred stock to
 105,150 shares of common stock...    (21,030)    --        105,150     --          --            --            --
Conversion of 100,000 shares of
 Series E preferred stock to
 20,000 shares of common stock....   (100,000)    --         20,000     --          --            --            --
Issuance of common stock warrants
 for services.....................     --         --         --         --               3        --            --
Net income........................     --         --         --         --          --               769        --
                                    ---------  ---------  ---------  ---------  -----------  -------------       -----
BALANCES AT MARCH 31, 1995........  1,997,477          2  9,051,325         45      12,216        (7,129)          (30)
Exercise of warrants for cash.....     --         --        695,200          4         420        --            --
Exercise of stock options for
 cash.............................                           80,550                     74
Issuance of stock grants to non-
 employee directors...............     --         --          8,000     --              40        --            --
Exchange of 12,500 shares of
 Series B preferred stock for
 2,500 shares of common stock.....    (12,500)    --          2,500     --          --            --            --
Retire 30,000 shares of treasury
 stock............................     --         --        (30,000)    --             (30)       --                30
Net income........................     --         --         --         --          --             1,729        --
                                    ---------  ---------  ---------  ---------  -----------  -------------       -----
BALANCES AT DECEMBER 31, 1995
 (unaudited)......................  1,984,977  $       2  9,807,575  $      49   $  12,720     $  (5,400)    $  --
                                    ---------  ---------  ---------  ---------  -----------  -------------       -----
                                    ---------  ---------  ---------  ---------  -----------  -------------       -----
 
<CAPTION>
 
                                        TOTAL
                                    STOCKHOLDERS'
                                       EQUITY
                                    -------------
<S>                                 <C>
BALANCES AT MARCH 31, 1993........    $   1,566
Common stock issued for cash, net
 of costs of $24..................        2,326
Exercise of warrants for cash.....           38
Exercise of stock options for
 cash.............................            2
Common stock issued in
 satisfaction of debt.............           24
Other.............................       --
Net income........................          204
                                         ------
BALANCES AT MARCH 31, 1994........        4,160
Common stock issued for cash, net
 of costs of $6...................          145
Exercise of warrants for cash.....           24
Exercise of stock options for
 cash.............................            3
Conversion of 21,030 shares of
 Series C preferred stock to
 105,150 shares of common stock...       --
Conversion of 100,000 shares of
 Series E preferred stock to
 20,000 shares of common stock....       --
Issuance of common stock warrants
 for services.....................            3
Net income........................          769
                                         ------
BALANCES AT MARCH 31, 1995........        5,104
Exercise of warrants for cash.....          424
Exercise of stock options for
 cash.............................           74
Issuance of stock grants to non-
 employee directors...............           40
Exchange of 12,500 shares of
 Series B preferred stock for
 2,500 shares of common stock.....       --
Retire 30,000 shares of treasury
 stock............................       --
Net income........................        1,729
                                         ------
BALANCES AT DECEMBER 31, 1995
 (unaudited)......................    $   7,371
                                         ------
                                         ------
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-5
<PAGE>
                             CYANOTECH CORPORATION
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                      YEARS ENDED MARCH 31, 1994 AND 1995
                AND NINE MONTHS ENDED DECEMBER 31, 1994 AND 1995
                                 (IN THOUSANDS)
 
<TABLE>
<CAPTION>
                                                                    YEAR ENDED MARCH 31,     NINE MONTHS ENDED
                                                                                                DECEMBER 31,
                                                                    --------------------  ------------------------
                                                                      1994       1995        1994         1995
                                                                    ---------  ---------  -----------  -----------
<S>                                                                 <C>        <C>        <C>          <C>
                                                                                          (UNAUDITED)  (UNAUDITED)
CASH FLOWS FROM OPERATING ACTIVITIES:
  Net income......................................................  $     204  $     769   $     503    $   1,729
  Adjustments to reconcile net income to net cash provided by
   operating activities:
    Proportionate share of loss of joint venture..................         35         37          37       --
    Depreciation and amortization.................................        253        338         234          356
    Net (increase) decrease in:
      Accounts receivable.........................................        (77)      (186)         (5)        (643)
      Inventories.................................................       (159)        23         (43)         100
      Prepaid expenses and other assets...........................         33        (17)        (40)         (45)
    Net increase (decrease) in:
      Accounts payable............................................        283         63        (152)          71
      Accrued expenses and other..................................         63        (28)         45          142
                                                                    ---------  ---------  -----------  -----------
        Net cash provided by operating activities.................        635        999         579        1,710
                                                                    ---------  ---------  -----------  -----------
CASH FLOWS FROM INVESTING ACTIVITIES:
  Investment in equipment and leasehold improvements..............     (1,770)    (1,442)       (982)      (2,622)
  Investment in joint venture.....................................        (35)       (37)        (37)      --
                                                                    ---------  ---------  -----------  -----------
        Net cash used in investing activities.....................     (1,805)    (1,479)     (1,019)      (2,622)
                                                                    ---------  ---------  -----------  -----------
CASH FLOWS FROM FINANCING ACTIVITIES:
  Net proceeds from issuance of common stock......................      2,366        175         174          538
  Proceeds from issuance of long-term debt........................     --         --          --              750
  Principal payments on capital lease obligations.................        (10)       (52)        (38)         (64)
  Principal payments on long-term debt............................       (532)       (13)        (10)         (32)
                                                                    ---------  ---------  -----------  -----------
        Net cash provided by financing activities.................      1,824        110         126        1,192
                                                                    ---------  ---------  -----------  -----------
        Net increase (decrease) in cash and cash equivalents......        654       (370)       (314)         280
Cash and cash equivalents at beginning of period..................        212        866         866          496
                                                                    ---------  ---------  -----------  -----------
Cash and cash equivalents at end of period........................  $     866  $     496   $     552    $     776
                                                                    ---------  ---------  -----------  -----------
                                                                    ---------  ---------  -----------  -----------
Supplemental disclosure of cash flow information:
  Cash paid during the period for interest........................  $      18  $      26   $      20    $      25
                                                                    ---------  ---------  -----------  -----------
                                                                    ---------  ---------  -----------  -----------
  Non-cash investing and financing activities:
    Equipment leased under capital lease obligation...............  $     133  $     166   $     167    $     303
                                                                    ---------  ---------  -----------  -----------
                                                                    ---------  ---------  -----------  -----------
    Common stock issued in satisfaction of debt...................  $      24  $  --       $  --        $  --
                                                                    ---------  ---------  -----------  -----------
                                                                    ---------  ---------  -----------  -----------
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-6
<PAGE>
                             CYANOTECH CORPORATION
                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
                      YEARS ENDED MARCH 31, 1994 AND 1995
            AND FOR THE NINE MONTHS ENDED DECEMBER 31, 1994 AND 1995
                    (INFORMATION AS OF DECEMBER 31, 1995 AND
           NINE MONTHS ENDED DECEMBER 31, 1994 AND 1995 IS UNAUDITED)
                 (ALL AMOUNTS IN THOUSANDS, EXCEPT SHARE DATA)
 
(1) SUMMARY OF ACCOUNTING POLICIES
 
    (a) Description of Business
 
    Cyanotech  Corporation  is  engaged  in  the  identification  and  wholesale
commercialization of  high-value chemicals,  nutritional additives  and  related
products  derived  from blue-green  (cyanobacteria)  and other  algae. Cyanotech
Corporation is  dependent,  to an  extent,  upon  the health  food  and  medical
diagnostic industry sectors.
 
    (b) Principles of Consolidation
 
   
    The Company consolidates enterprises in which it has a controlling financial
interest.   The  accompanying  consolidated  financial  statements  include  the
accounts of Cyanotech Corporation and its wholly owned subsidiary, Nutrex,  Inc.
All  significant intercompany balances and  transactions have been eliminated in
consolidation.
    
 
    (c) Cash Equivalents
 
    For purposes  of the  consolidated  statements of  cash flows,  the  Company
considers  all highly liquid debt investments purchased with original maturities
of three months or less to be cash equivalents.
 
    (d) Inventories
 
    Inventories are stated at  the lower of  cost (which approximates  first-in,
first-out) or market.
 
    (e) Equipment and Leasehold Improvements
 
    Owned  equipment and  leasehold improvements  are stated  at cost. Equipment
under capital lease is stated at the lower of the present value of minimum lease
payments or  fair  value  of  the  equipment at  the  inception  of  the  lease.
Depreciation  and amortization are provided  using the straight-line method over
the following estimated useful lives:
 
<TABLE>
<CAPTION>
                                                                                  ESTIMATED
                                                                                USEFUL LIVES
                                                                               ---------------
<S>                                                                            <C>
Equipment....................................................................    3 to 10 years
Leasehold improvements.......................................................       lease term
Furniture and fixtures.......................................................          7 years
Equipment under capital lease................................................       lease term
</TABLE>
 
    Amortization of equipment  under capital lease  is included in  depreciation
and amortization expense in the accompanying consolidated financial statements.
 
    (f) Investments in Joint Ventures
 
    Investments  in joint ventures  and other investments  for which the Company
has the  ability  to  exercise  significant influence  over  the  operating  and
financing policies of the enterprise are accounted for under the equity method.
 
    (g) Net Income Per Common Share
 
    Net  income per common share is computed based on net income after preferred
stock dividend requirements  and the  weighted average number  of common  shares
outstanding during the year, adjusted to
 
                                      F-7
<PAGE>
                             CYANOTECH CORPORATION
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
(1) SUMMARY OF ACCOUNTING POLICIES (CONTINUED)
reflect  the assumed exercise of outstanding  stock options and warrants and the
conversion of preferred stock to the extent such items have a dilutive effect on
the computation. Fully  diluted net income  per common share  is not  materially
different from primary net income per common share.
 
    (h) Income Taxes
 
    Deferred  tax  assets  and liabilities  are  recognized for  the  future tax
consequences  attributable  to  differences  between  the  financial   statement
carrying  amounts of  existing assets  and liabilities  and their  tax bases and
operating loss carryforwards. Deferred tax  assets and liabilities are  measured
using  enacted income tax rates  applicable to the period  in which the deferred
tax assets or liabilities are expected to be realized or settled. As changes  in
tax  laws or rates are enacted, deferred tax assets and liabilities are adjusted
through the provision for income taxes.
 
    (i) Accounting Changes -- Future Implementation
 
    In March 1995, the Financial Accounting Standards Board issued Statement  of
Financial Accounting Standards (SFAS) No. 121, "Accounting for the Impairment of
Long-Lived  Assets and for  Long-Lived Assets to  Be Disposed Of."  SFAS No. 121
requires that long-lived  assets and certain  identifiable intangibles held  and
used  by an  entity be  reviewed for  impairment whenever  events or  changes in
circumstances indicate  that  the  carrying  amount  of  an  asset  may  not  be
recoverable.  If the sum of the expected future cash flows derived from an asset
is less than the carrying amount of the asset, an impairment loss is recognized.
Measurement of that loss would be based on the fair value of the asset.
 
    Generally,  SFAS  No.  121  requires  that  long-lived  assets  and  certain
identifiable  intangibles to be disposed of be reported at the lower of carrying
amount or fair value less cost to sell.
 
    The provisions of SFAS No. 121 must be adopted by the Company no later  than
April  1, 1996. The Company has not determined when it will adopt the provisions
of SFAS No. 121 but  does not expect adoption to  have a material effect on  the
Company's consolidated financial condition or results of operations.
 
    In  October 1995, the  Financial Accounting Standards  Board issued SFAS No.
123, "Accounting for Stock-Based Compensation." SFAS No. 123 establishes a  new,
fair  value based  method of  measuring stock-based  compensation, but  does not
require an entity  to adopt  the new method  for preparing  its basic  financial
statements.  For  entities  not  adopting the  new  method  for  preparing basic
financial statements, SFAS No. 123 requires  disclosure in the footnotes of  pro
forma net earnings and earnings per share information as if the fair value based
method  had been adopted. Adoption of SFAS No. 123 is required no later than the
Company's year ending March  31, 1997. The disclosure  requirements of SFAS  No.
123  are effective  for financial  statements for  fiscal years  beginning after
December 31, 1995. The Company will  comply with the disclosure requirements  of
SFAS No. 123 in its financial statements for its year ending March 31, 1997.
 
(2) INVENTORIES
    Inventories  consists of  the following  as of March  31, 1994  and 1995 and
December 31, 1995:
 
<TABLE>
<CAPTION>
                                                                       MARCH 31,
                                                                  --------------------   DECEMBER 31,
                                                                    1994       1995          1995
                                                                  ---------  ---------  ---------------
<S>                                                               <C>        <C>        <C>
Raw materials...................................................  $      15  $      29     $      67
Work in process.................................................        105        105           105
Finished goods..................................................        192        171            33
Supplies........................................................         86         70            70
                                                                  ---------  ---------         -----
                                                                  $     398  $     375     $     275
                                                                  ---------  ---------         -----
                                                                  ---------  ---------         -----
</TABLE>
 
                                      F-8
<PAGE>
                             CYANOTECH CORPORATION
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
(3) EQUIPMENT AND LEASEHOLD IMPROVEMENTS, NET
    Equipment and leasehold improvements consists  of the following as of  March
31, 1994 and 1995 and December 31, 1995:
 
<TABLE>
<CAPTION>
                                                                 MARCH 31,
                                                            --------------------  DECEMBER 31,
                                                              1994       1995         1995
                                                            ---------  ---------  ------------
<S>                                                         <C>        <C>        <C>
Equipment.................................................  $   2,221  $   2,622   $    2,995
Leasehold improvements....................................      2,638      3,648        6,028
Furniture and fixtures....................................         28         31           36
Equipment under capital lease (note 5)....................        133        299          602
                                                            ---------  ---------  ------------
                                                                5,020      6,600        9,661
Less accumulated depreciation and amortization............     (2,201)    (2,539)      (2,895)
Construction in-progress..................................        546        574          438
                                                            ---------  ---------  ------------
    Equipment and leasehold improvements, net.............  $   3,365  $   4,635   $    7,204
                                                            ---------  ---------  ------------
                                                            ---------  ---------  ------------
</TABLE>
 
(4) LONG-TERM DEBT
    Long-term  debt consists of the following as  of March 31, 1994 and 1995 and
December 31, 1995:
 
<TABLE>
<CAPTION>
                                                                                                       MARCH 31,
                                                                                                      ------------  DECEMBER 31,
                                                                                                      1994   1995       1995
                                                                                                      -----  -----  ------------
<S>                                                                                                   <C>    <C>    <C>
Note payable at 5% to the State of Hawaii, Department of Agriculture, in annual installments of $14,
 including interest; final payment due September 1995...............................................  $  20  $   7     $--
Notes payable at the London Interbank Offered Rate (LIBOR) plus 2%, adjusted quarterly; principal
 payments of $37.5 due quarterly....................................................................   --     --         725
Less current maturities of long-term debt...........................................................    (13)    (7)     (175)
                                                                                                      -----  -----     -----
    Long-term debt, excluding current maturities....................................................  $   7  $--       $ 550
                                                                                                      -----  -----     -----
                                                                                                      -----  -----     -----
</TABLE>
 
    Note payable to the State of  Hawaii, Department of Agriculture was  secured
by substantially all of the Company's assets.
 
    On  April 1, 1995,  the Company executed  a $250 note,  payable in principal
installments of $12.5 each quarter,  plus interest, with principal and  interest
payments satisfied by delivering to the lender an equivalent market value amount
of  salable product  or cash  (at the lender's  option). The  note payable bears
interest at  the  London  Interbank  Offered  Rate  (LIBOR)  plus  2%,  adjusted
quarterly, and is secured by certain assets of the Company.
 
    On  July 11,  1995, the  Company executed a  $500 note  payable in principal
installments of $25  each quarter,  plus interest, with  principal and  interest
payments satisfied by delivering to the lender an equivalent market value amount
of  salable product  or cash  (at the lender's  option). The  note payable bears
interest at LIBOR plus 2%, adjusted quarterly, and is secured by certain  assets
of  the Company. The quarterly principal payment due October 1, 1995 was paid in
January 1996.
 
(5) LEASES
    The Company leases  certain of its  equipment and a  building under  capital
leases  expiring between 1998 and 2000 and leases facilities, equipment and land
under operating leases expiring  between 1996 and 2013.  At March 31, 1995,  the
net book value of equipment under the capital leases amounted to $266.
 
                                      F-9
<PAGE>
                             CYANOTECH CORPORATION
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
(5) LEASES (CONTINUED)
    Future  minimum lease payments under  noncancelable operating leases and the
present value of future minimum capital lease payments as of March 31, 1995  are
as follows:
 
<TABLE>
<CAPTION>
                                                                         CAPITAL      OPERATING
                                                                         LEASES        LEASES
                                                                      -------------  -----------
<S>                                                                   <C>            <C>
Year ended March 31:
  1996..............................................................    $      75     $      87
  1997..............................................................           75            77
  1998..............................................................           68            74
  1999..............................................................           58            72
  2000..............................................................            3            72
  Thereafter, through 2013..........................................       --               941
                                                                            -----    -----------
                                                                              279     $   1,323
                                                                                     -----------
                                                                                     -----------
Less amount representing interest at 8.1%...........................           37
                                                                            -----
    Present value of minimum capital lease obligations..............          242
Less current maturities of capital lease obligations................           58
                                                                            -----
    Obligations under capital lease, excluding current maturities...    $     184
                                                                            -----
                                                                            -----
</TABLE>
 
    Total  rent expense under operating  leases amounted to $49  and $48 for the
years ended March 31, 1994 and 1995, respectively, and $33 and $71 for the  nine
months ended December 31, 1994 and 1995, respectively.
 
    As of March 31, 1995, the Company has received a commitment for an equipment
leasing credit facility totalling $350.
 
(6) INVESTMENT IN JOINT VENTURES
    In  March 1993, the Company formed  a joint venture corporation, OceanColor,
Inc., with an unrelated entity, Aquasearch, Inc., to develop commercial  systems
for producing a natural red pigment from micro-
algae,  called  astaxanthin,  for  use  as  a  natural  feed  ingredient  by the
aquaculture industry.  On November  18, 1994,  the joint  venture agreement  was
terminated  by mutual consent.  Under the terms of  the joint venture agreement,
the Company  owned a  50% interest  in OceanColor,  Inc., and  was committed  to
contribute, subject to certain conditions, services and facilities and equipment
use  and technology valued at $423. As  of the termination date, $63 of services
and facilities and  equipment use had  been contributed and  the Company has  no
further  obligation  under the  joint venture  arrangement. The  joint venture's
financial statements are not significant to the Company's consolidated financial
statements. The Company plans to continue, on its own, development of commercial
systems for the production of astaxanthin.
 
    On August 31,  1994, the  Company formed  a joint  venture partnership  with
Hauser  Chemical Research, Inc. (Hauser) to develop, produce, and market natural
beta carotene. Under the  terms of the partnership  agreement, Hauser has a  60%
interest  and the Company has  a 40% interest in  the joint venture. Development
work was expected to be completed in 1995 with the total cost to the Company for
its share of development costs not expected to exceed $300 (as of March 31, 1995
and December  31, 1995,  approximately  $125 and  $174, respectively,  had  been
incurred).  Funding for the  construction of the  commercial production facility
would be arranged by the joint venture partnership.
 
                                      F-10
<PAGE>
                             CYANOTECH CORPORATION
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
(7) ACCRUED EXPENSES AND OTHER
    Accrued expenses and other  consists of the following  as of March 31,  1994
and 1995 and December 31, 1995:
 
<TABLE>
<CAPTION>
                                                                       MARCH 31,
                                                                  --------------------   DECEMBER 31,
                                                                    1994       1995          1995
                                                                  ---------  ---------  ---------------
<S>                                                               <C>        <C>        <C>
Accrued payroll and related benefits............................  $      64  $     126     $     269
Accrued directors' fees.........................................         40         35            30
Deposits........................................................         58         26        --
Other accrued liabilities.......................................         96         43            73
                                                                  ---------  ---------         -----
                                                                  $     258  $     230     $     372
                                                                  ---------  ---------         -----
                                                                  ---------  ---------         -----
</TABLE>
 
(8) PREFERRED STOCK
    Series A and B preferred stock are nonvoting (except for the right of Series
A  preferred stockholders  to elect one  director, as described  below) and were
convertible into common stock at the rate of five shares of preferred stock  for
one share of common stock through February 28, 1995 for Series A preferred stock
and  February  28,  1993 for  Series  B  preferred stock.  Holders  of  Series A
preferred stock are entitled to 12%  cumulative annual dividends at the rate  of
$.048  per  share; cumulative  dividends in  arrears  as of  March 31,  1995 and
December 31, 1995 amount to $595 ($.476  per share) and $640 ($.512 per  share),
respectively,  for Series A. Series A  preferred stockholders have a prior claim
in liquidation of  $.40 per  share plus all  declared but  unpaid dividends.  On
December 27, 1995, the Company exchanged 2,500 shares of restricted common stock
for the remaining 12,500 shares of Series B perferred stock.
 
    Series  A  preferred  stockholders  also  have  certain  preemptive  rights,
anti-dilution privileges  and the  right to  elect one  member of  the board  of
directors.  The consent of  Series A preferred stockholders  is also required to
alter their present rights, issue additional shares of preferred stock, sell the
Company, or sell or assign the Company's proprietary technical information.
 
    Series C convertible preferred stock is convertible into common stock at the
rate of one share  of preferred stock  for five shares  of common stock  through
February  23,  2000,  after  which  date the  conversion  feature  is  no longer
applicable. Holders of  21,030 shares  of Series  C preferred  stock elected  to
convert  such shares into 105,150  shares of common stock  during the year ended
March 31, 1995. Series C preferred stock  has voting rights equal to the  number
of  shares of common stock into which it  is convertible and has a preference in
liquidation over all other series  of preferred stock of  $5 per share plus  any
accumulated  but  unpaid  dividends. Holders  of  Series C  preferred  stock are
entitled to  8% cumulative  annual dividends  at  the rate  of $.40  per  share;
cumulative  dividends in  arrears as  of March  31, 1995  and December  31, 1995
amount to $1,663 ($2.263 per share) and $1,884 ($2.563 per share), respectively.
Upon conversion of Series C preferred stock, cumulative dividends in arrears  on
converted  shares  are no  longer payable.  The  amount of  cumulative dividends
foregone due to conversion  during the year  ended March 31,  1995 and the  nine
months  ended  December 31,  1995  amounted to  $36  and nil,  respectively. The
consent of Series C preferred stockholders  is required to change their  present
rights or sell all or substantially all of the Company's assets.
 
    The  Series  C  convertible preferred  stock  was originally  issued  with a
redemption feature.  Terms of  the Series  C preferred  stock were  modified  in
February 1991 to eliminate such redemption feature.
 
    Series  E convertible preferred stock was convertible at the holder's option
into common stock at the rate of five shares of preferred stock for one share of
common or for  such number  of common  shares as have  a market  value of  $.75,
through  September 26, 1994. Series E  convertible preferred stock was converted
by the holder into  20,000 shares of  common stock on  September 21, 1994.  Upon
conversion  of  Series E  preferred stock,  cumulative  dividends in  arrears on
converted shares  were no  longer payable.  The amount  of cumulative  dividends
foregone due to conversion during the year ended March 31, 1995 was $38.
 
                                      F-11
<PAGE>
                             CYANOTECH CORPORATION
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
(8) PREFERRED STOCK (CONTINUED)
    Preferred stock as of March 31, 1994 and 1995 and December 31, 1995, consist
of the following:
 
<TABLE>
<CAPTION>
                                                         MARCH 31,
                                                         ----------  DECEMBER 31,
                                                         1994  1995      1995
                                                         ----  ----  ------------
<S>                                                      <C>   <C>   <C>
Preferred stock, authorized 5,000,000 shares;
 $.001 par value, issued and outstanding:
  Series A, 12% cumulative; 1,250,000 shares;
   liquidation value $.40 per share plus
   unpaid accumulated dividends........................  $  1  $  1      $  1
  Series B, 12% cumulative, 12,500 shares on
   March 31, 1994 and 1995; nil shares on
   December 31, 1995; liquidation value $.40 per share
   plus unpaid accumulated dividends...................   *     *       --
  Series C, 8% cumulative, convertible; 756,007 shares
   as of March 31, 1994 and 734,977 shares as of March
   31, 1995 and December 31, 1995: liquidation value
   $5.00 per share plus unpaid accumulated dividends...     1     1         1
  Series E, 12% cumulative, convertible; converted to
   common shares in September 1994.....................   *     --      --
                                                         ----  ----     -----
                                                         $  2  $  2      $  2
                                                         ----  ----     -----
                                                         ----  ----     -----
</TABLE>
 
- ------------------------
*Amount is less than $.5
 
(9) STOCK OPTIONS AND WARRANTS
 
STOCK OPTIONS
 
    At  the  Annual Meeting  held on  August  9, 1995,  the stockholders  of the
Company approved the Company's 1995 Stock Option Plan (Plan), reserving a  total
of 400,000 shares of common stock for issuance under the Plan. The Plan provides
for  the issuance of both incentive  and nonqualified stock options. Options are
to be granted at or above the fair market value of the Company's common stock at
the date of grant and generally become exercisable over a five-year period.
 
    The Company also has  a Non-Employee Director Stock  Option and Stock  Grant
Plan,  which was approved by stockholders  in 1994. Under the Plan, non-employee
directors are  granted  a  ten-year  option to  purchase  3,000  shares  of  the
Company's  common  stock at  its  fair market  value on  the  date of  grant. In
addition, on the date of each Annual  Meeting of Stockholders in each year  that
this  plan is in effect, each non-employee director continuing in office will be
automatically granted, without  payment, 2,000  shares of common  stock that  is
non-transferable  for six  months following the  date of grant.  Grants of 8,000
shares of common stock were made under this plan in August 1995.
 
    In 1985, the Company adopted an Incentive Stock Option Plan (qualified stock
option plan) and authorized 200,000 shares of  common stock to be set aside  for
grants  to officers and key employees of  the Company. In 1993, the stockholders
approved an amendment  to the Incentive  Stock Option Plan  which increased  the
number  of shares reserved for issuance under this plan from 200,000 to 400,000.
Options are granted with exercise prices not lower than the fair market value of
the Company's  common stock  at  the date  of  grant. Options  generally  become
excercisable  in four  equal annual installments,  commencing one  year from the
date of grant and expire, if not  exercised, five years from the date of  grant,
unless stipulated
 
                                      F-12
<PAGE>
                             CYANOTECH CORPORATION
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
(9) STOCK OPTIONS AND WARRANTS (CONTINUED)
otherwise  by  the  Compensation and  Stock  Option  Committee of  the  board of
directors. The Incentive Stock Option Plan terminated on March 18, 1995. Options
granted prior to the plan termination date are not affected.
 
    The Company has also issued  nonqualified stock options to nonemployees  and
directors  in exchange for services provided  to the Company. Nonqualified stock
options are granted with exercise prices not lower than the fair market value of
the Company's common stock on the date of grant, are immediately exercisable and
expire two to ten years from the date of grant.
 
    A summary of transactions relating to  options during the years ended  March
31, 1994 and 1995, and nine months ended December 31, 1995 is set forth below:
 
   
<TABLE>
<CAPTION>
                                                                          OPTIONS OUTSTANDING
                                                       ----------------------------------------------------------
                                                                QUALIFIED                    NONQUALIFIED
                                         SHARES UNDER  ----------------------------  ----------------------------
                                            OPTION      NUMBERS OF                    NUMBER OF
                                          AVAILABLE    SHARES UNDER    PRICE PER     SHARES UNDER    PRICE PER
                                          FOR GRANT       OPTION         SHARE          OPTION         SHARE
                                         ------------  ------------  --------------  ------------  --------------
<S>                                      <C>           <C>           <C>             <C>           <C>
Balances at March 31, 1993.............       47,400       152,600   $   .56 to .94       18,000   $  .50 to 5.25
Additional shares reserved.............      200,000        --             --             --             --
Options granted........................      (82,000)       82,000             1.50       --             --
Options exercised......................       --            (3,300)      .56 to .94       --             --
Options cancelled......................       10,300       (10,300)     .56 to 1.50      (16,000)    3.30 to 5.25
                                         ------------  ------------  --------------  ------------  --------------
Balances at March 31, 1994.............      175,700       221,000      .56 to 1.50        2,000              .50
Options granted........................      (98,900)       98,900              .94      115,000     1.06 to 2.00
Options exercised......................       --            (4,300)     .56 to  .94       --             --
Options cancelled......................       20,900       (20,900)     .56 to 1.50       (3,000)            1.06
                                         ------------  ------------  --------------  ------------  --------------
Balances at March 31, 1995.............       97,700       294,700      .56 to 1.50      114,000      .50 to 2.00
Additional shares reserved.............      400,000        --             --             --             --
Options granted........................     (101,000)      101,000             5.13       --             --
Options exercised......................                    (77,550)     .56 to 1.50       (3,000)            1.06
Options cancelled......................        3,675        (3,675)     .56 to 1.50       --             --
Expiration of 1985 Plan................     (101,375)       --             --             --             --
                                         ------------  ------------  --------------  ------------  --------------
Balances at December 31, 1995..........      299,000       314,475   $  .56 to 5.13      111,000   $  .50 to 2.00
                                         ------------  ------------  --------------  ------------  --------------
                                         ------------  ------------  --------------  ------------  --------------
</TABLE>
    
 
    At  March 31, 1995  and December 31,  1995, options to  purchase 408,700 and
425,475 shares of common stock, respectively, were exercisable at average prices
of $1.23 and $2.21 per share, respectively.
 
WARRANTS
 
    The Company has warrants outstanding to acquire 1,653,800 and 997,000 shares
of the  Company's common  stock as  of March  31, 1995  and December  31,  1995,
respectively.  The  warrants  were  issued in  consideration  for  loans  to the
Company, in consideration for  and in recognition of  services performed and  to
certain  individuals  who  guaranteed  notes payable  by  the  Company. Warrants
granted for loans, services and guarantees were granted with exercise prices not
lower than the fair market  value of the Company's common  stock on the date  of
grant.  The warrants are  exercisable at prices  ranging from $.40  to $1.00 per
share and expire on various dates from 1996 to 1999.
 
                                      F-13
<PAGE>
                             CYANOTECH CORPORATION
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
(10) MAJOR CUSTOMERS AND EXPORT SALES
    Sales to major customers for  the years ended March  31, 1994 and 1995,  and
the  nine months  ended December  31, 1994 and  1995, are  summarized as follows
(percent of product sales):
 
<TABLE>
<CAPTION>
                                                        YEAR ENDED MARCH 31,      NINE MONTHS ENDED DECEMBER 31,
                                                      ------------------------  ----------------------------------
                                                         1994         1995            1994              1995
                                                         -----        -----     ----------------  ----------------
<S>                                                   <C>          <C>          <C>               <C>
Customer A..........................................          *%           *%             *%               31%
Customer B..........................................         16%          17%            13%               11%
Customer C..........................................          *%          13%            12%                *%
Customer D..........................................         10%           *%             *%                *%
                                                             --           --             --                --
                                                             26%          30%            25%               42%
                                                             --           --             --                --
                                                             --           --             --                --
</TABLE>
 
- ------------------------
*Less than 10% of product sales.
 
    Product sales revenue by geographic area for the years ended March 31,  1994
and  1995, and the nine months ended  December 31, 1994 and 1995, are summarized
as follows:
 
<TABLE>
<CAPTION>
                                                  YEAR ENDED MARCH 31,     NINE MONTHS ENDED
                                                                              DECEMBER 31,
                                                  --------------------  ------------------------
                                                    1994       1995        1994         1995
                                                  ---------  ---------  -----------  -----------
<S>                                               <C>        <C>        <C>          <C>
United States...................................  $   1,828  $   2,412   $   1,781    $   2,620
Canada..........................................        497        696         378          654
Europe..........................................        202        621         424          558
Asia/Pacific....................................        170        421         338        2,150
                                                  ---------  ---------  -----------  -----------
                                                  $   2,697  $   4,150   $   2,921    $   5,972
                                                  ---------  ---------  -----------  -----------
                                                  ---------  ---------  -----------  -----------
</TABLE>
 
(11) INCOME TAXES
    The provision for income taxes for the  years ended March 31, 1994 and  1995
and  nine months ended  December 31, 1994 is  nil due to  the utilization of net
operating losses.  The provision  for income  taxes for  the nine  months  ended
December 31, 1995 represents estimated alternative minimum taxes payable.
 
    The  tax  effects of  temporary differences  related  to various  assets and
liabilities that give rise to deferred  tax assets and deferred tax  liabilities
as of March 31, 1994 and 1995, are as follows:
 
<TABLE>
<CAPTION>
                                                                                MARCH 31,
                                                                           --------------------
                                                                             1994       1995
                                                                           ---------  ---------
<S>                                                                        <C>        <C>
Deferred tax assets:
  Net operating loss carryforwards.......................................  $   2,949  $   2,585
  Tax credit carryforwards...............................................        149        141
  Other..................................................................         62         72
                                                                           ---------  ---------
                                                                               3,160      2,798
Less valuation allowance.................................................     (3,051)    (2,751)
                                                                           ---------  ---------
    Net deferred tax assets..............................................  $     109  $      47
                                                                           ---------  ---------
                                                                           ---------  ---------
Deferred tax liability -- equipment and leasehold improvements...........  $     109  $      47
                                                                           ---------  ---------
                                                                           ---------  ---------
</TABLE>
 
    The  valuation allowance for  deferred tax assets  as of March  31, 1994 and
1995 was $3,051 and $2,751,  respectively. The valuation allowance decreased  by
$71 and $300 during the years ended March 31, 1994 and 1995, respectively.
 
                                      F-14
<PAGE>
                             CYANOTECH CORPORATION
             NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (CONTINUED)
 
(11) INCOME TAXES (CONTINUED)
    At  March 31, 1995, the Company has tax net operating tax loss carryforwards
available to  offset future  federal and  state taxable  income and  tax  credit
carryforwards available to offset future federal income taxes as follows:
 
   
<TABLE>
<CAPTION>
                                                                              INVESTMENT    RESEARCH AND
                                                              NET OPERATING      TAX       EXPERIMENTATION
                                                                 LOSSES        CREDITS       TAX CREDITS
                                                              -------------   ----------   ---------------
<S>                                                           <C>             <C>          <C>
Expires March 31,
  1998......................................................     $--            -$-              $ 3
  1999......................................................     --             --                14
  2000......................................................     --               14              15
  2001......................................................        852         --                22
  2002......................................................      1,800         --                15
  2003......................................................      1,405                           52
  2004......................................................      1,825         --                 5
  2005......................................................        155         --            --
  2006......................................................        763         --            --
  2007......................................................          1         --            --
  2008......................................................     --             --            --
  2009......................................................          1         --            --
                                                                 ------        -----           -----
                                                                 $6,802          $14             $126
                                                                 ------        -----           -----
                                                                 ------        -----           -----
</TABLE>
    
 
    Investment  tax credits will be recorded as a reduction of the provision for
federal income taxes in the year realized.
 
(12) COMMITMENTS AND CONTINGENCIES
    At March 31,  1995 and December  31, 1995, the  Company has commitments  for
capital expenditures totaling $506 and $1,120, respectively.
 
    The  Company is involved in various claims arising in the ordinary course of
business. In  the  opinion of  management,  the ultimate  disposition  of  these
matters  will  not have  a material  adverse effect  on the  Company's financial
position or results of operations.
 
                                      F-15


<PAGE>

[Aerial photograph of Cyanotech's production facility located 
at the Hawaii Ocean Science and Technology Park on the Kona coast of 
Hawaii.]

Cyanotech's production facility located at the Hawaii Ocean Science and 
Technology Park on the Kona coast of Hawaii

[Photograph of selected bottles containing the Company's Spirulina 
products.]


<PAGE>
- -------------------------------------------
                                     -------------------------------------------
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                                     -------------------------------------------
 
    NO  DEALER, SALESPERSON OR ANY OTHER PERSON  HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS NOT CONTAINED IN THIS PROSPECTUS AND,
IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS
HAVING BEEN AUTHORIZED BY THE COMPANY OR THE UNDERWRITERS. THIS PROSPECTUS  DOES
NOT  CONSTITUTE AN OFFER OF ANY SECURITIES  OTHER THAN THOSE TO WHICH IT RELATES
OR AN OFFER TO SELL, OR A SOLICITATION OF AN OFFER TO BUY, TO ANY PERSON IN  ANY
JURISDICTION  IN WHICH SUCH OFFER OR SOLICITATION WOULD BE UNLAWFUL. NEITHER THE
DELIVERY OF THIS PROSPECTUS  NOR ANY OFFER OR  SALE MADE HEREUNDER SHALL,  UNDER
ANY  CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE  HAS BEEN NO CHANGE IN THE
AFFAIRS OF THE COMPANY OR THAT THE INFORMATION CONTAINED HEREIN IS CORRECT AS OF
ANY TIME SUBSEQUENT TO THE DATE HEREOF.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
<TABLE>
<CAPTION>
                                                    PAGE
                                                    -----
<S>                                              <C>
Prospectus Summary.............................           3
Risk Factors...................................           5
Use of Proceeds................................          13
Price Range of Common Stock and Dividend
 Policy........................................          13
Capitalization.................................          14
Selected Consolidated Financial Data...........          15
Management's Discussion and Analysis of
 Financial Condition and Results of
 Operations....................................          16
Business.......................................          23
Management.....................................          37
Certain Transactions...........................          41
Principal Stockholders.........................          42
Description of Capital Stock...................          43
Shares Eligible for Future Sale................          45
Underwriting...................................          48
Legal Matters..................................          49
Experts........................................          49
Available Information..........................          49
Index to Consolidated Financial Statements.....         F-1
</TABLE>
 
                                1,500,000 SHARES
 
                                 [COMPANY LOGO]
 
                             CYANOTECH CORPORATION
 
                                  COMMON STOCK
 
                             ---------------------
 
                                   PROSPECTUS
 
                             ---------------------
 
   
                              VAN KASPER & COMPANY
    
 
   
                                 MARCH 21, 1996
    
 
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