ADELPHIA COMMUNICATIONS CORP
S-3, 1999-06-21
CABLE & OTHER PAY TELEVISION SERVICES
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<PAGE>

     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON June 21, 1999
                                                           REGISTRATION NO. 333-
===============================================================================

                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C.  20549

                                   FORM S-3
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933

                      ADELPHIA COMMUNICATIONS CORPORATION
            (Exact name of registrant as specified in its charter)

<TABLE>
         DELAWARE                                       4841                                     23-2417713
<S>                                           <C>                                    <C>
(State or other jurisdiction of               (Primary Standard Industrial           (I.R.S. Employer Identification No.)
 incorporation or organization)                Classification Code Number)
</TABLE>

                             MAIN AT WATER STREET
                       COUDERSPORT, PENNSYLVANIA  16915
                                (814) 274-9830
  (Address, including zip code, and telephone number, including area code, of
                   registrant's principal executive offices)

                             COLIN HIGGIN, ESQUIRE
                            DEPUTY GENERAL COUNSEL
                      ADELPHIA COMMUNICATIONS CORPORATION
                             MAIN AT WATER STREET
                       COUDERSPORT, PENNSYLVANIA  16915
                                (814) 274-9830
      (Name, address, including zip code, and telephone number, including
                       area code, of agent for service)

                PLEASE ADDRESS A COPY OF ALL COMMUNICATIONS TO:

                      CARL E. ROTHENBERGER, JR., ESQUIRE
                  BUCHANAN INGERSOLL PROFESSIONAL CORPORATION
                         21ST FLOOR, 301 GRANT STREET
                        PITTSBURGH, PENNSYLVANIA  15219
                                (412) 562-8826

APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: From time to
time after the effective date of this Registration Statement.

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

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

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

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

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

                        CALCULATION OF REGISTRATION FEE

<TABLE>
<CAPTION>
=================================================================================================================================
                                                                                Proposed           Proposed
                                                                                 maximum           maximum
                Title of each class of                       Amount to       offering price       aggregate          Amount of
             securities to be registered                   be registered      per share (1)   offering price (1)  registration fee
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                                                     <C>                  <C>              <C>                 <C>
Class A Common Stock, par value $.01 per share              6,000,000(2)            $58.31         $349,860,000         $97,262.00
                                                               shares
==================================================================================================================================
</TABLE>

(1)  Estimated solely for the purpose of determining the registration fee in
accordance with Rule 457(c) under the Securities Act of 1933, as amended.  The
maximum price per share information is based on the average of the high and the
low sale prices of Adelphia Communications Corporation Class A Common Stock,
$.01 par value per share, reported on the Nasdaq National Market System on  June
14, 1999.

(2)  An additional 1,000,000 shares of Class A Common Stock were previously
registered on a Registration Statement on Form S-3 (File No. 333-77651) for
which a registration fee of $18,400 was previously paid.  The previously
registered shares may be sold pursuant to the prospectus contained therein.
Pursuant to Rule 429 of the Rules and Regulations of the SEC under the
Securities Act, the combined prospectus contained herein also relates to the
Registration Statement on Form S-3 (File No. 333-77651).

The Registrant hereby amends this Registration Statement on such date or dates
as may be necessary to delay its effective date until the Registrant shall file
a further amendment which specifically states that this Registration Statement
shall thereafter become effective in accordance with Section 8(a) of the
Securities Act of 1933 or until the Registration Statement shall become
effective on such date as the Commission, acting pursuant to said Section 8(a),
may determine.

This Registration Statement has been filed pursuant to Rule 429 and relates to a
previously filed registration statement on Form S-3 (File No. 333-77651).

<PAGE>

<TABLE>
<S>                                             <C>
7,000,000 shares                                                        Subject to Completion
ADELPHIA COMMUNICATIONS CORPORATION                                       Dated June 21, 1999
Class A common stock


The stockholders of Adelphia Communications     respect to cash dividends and distributions
Corporation as described under the caption      upon the liquidation of Adelphia.  Holders of
"Selling Stockholders" on page 22 of this       Class B common stock are entitled to greater
prospectus are offering and selling up to       voting rights than the holders of Class A
7,000,000 shares of Adelphia's Class A          common stock; however, the holders of Class A
common stock under this prospectus.             common stock, voting as a separate class, are
                                                entitled to elect one of Adelphia's directors.


The Class A common stock is listed on the       You should carefully review "Risk Factors"
Nasdaq National Market. The Class A Common      beginning on page 3 for a discussion of things
stock's ticker symbol is "ADLAC."  On June      you should consider when investing in our
17, 1999, the closing sale price on the         Class A common stock.
Nasdaq National Market of a single share of
the Class A common stock was $65 1/2.


Our common stock also includes Class B common   Neither the SEC nor any state securities
stock.  The rights of holders of the Class A    commission has approved or disapproved of
common stock and Class B common stock differ    these securities or passed upon the adequacy
with respect to certain aspects of              or accuracy of this prospectus.  Any
dividends, liquidations and voting.  The        representation to the contrary is a criminal
Class A common stock has preferential rights    offense.
with
</TABLE>

             The date of this prospectus is __________ ____, 1999.

     The information in the prospectus is not complete and may be changed.  The
selling stockholders may not sell these securities until the registration
statement filed with the SEC is effective.  This prospectus is not an offer to
sell securities and is not soliciting an offer to buy these securities in any
state where the offer is prohibited.
<PAGE>

<TABLE>
<CAPTION>

                               TABLE OF CONTENTS
                               -----------------
<S>                                                                     <C>
ADELPHIA........................................................         1

RISK FACTORS....................................................         3

DILUTION........................................................        22

SELLING STOCKHOLDERS............................................        22

USE OF PROCEEDS.................................................        23

PLAN OF DISTRIBUTION............................................        23

WHERE YOU CAN FIND MORE INFORMATION.............................        25

EXPERTS.........................................................        26
</TABLE>

                                       i
<PAGE>

                                   ADELPHIA

      Adelphia is a leader in the telecommunications industry with cable
television and local telephone operations. Our operations consist of providing
telecommunications services primarily over our networks, which are commonly
referred to as broadband networks because they can transmit large quantities of
voice, video and data by way of digital or analog signals. As of March 31, 1999,
we owned or managed cable television systems with broadband networks that passed
in front of 3,357,400 homes and served 2,380,409 basic subscribers. John J.
Rigas, the Chairman, President, Chief Executive Officer and founder of Adelphia,
has owned and operated cable television systems since 1952.

      We own cable systems in twelve states which are organized into seven
regional clusters: Western New York, Virginia, Western Pennsylvania, New
England, Eastern Pennsylvania, Ohio and New Jersey. These systems are located
primarily in suburban areas of large and medium-sized cities within the 50
largest television markets. As of March 31, 1999, the broadband networks for
these systems passed in front of 2,230,257 homes and served 1,595,536 basic
subscribers.

      We also provide management and consulting services to other partnerships
and corporations engaged in the ownership and operation of cable television
systems. John J. Rigas and members of his immediate family, including entities
they own or control, have substantial ownership interests in these partnerships
and corporations. As of March 31, 1999, the broadband networks for cable
systems owned by these Rigas family partnerships and corporations passed in
front of 178,021 homes and served 134,015 basic subscribers.

      We also own a 50% voting interest and nonvoting preferred limited
partnership interests in Olympus Communications, L.P. Olympus is a joint venture
limited partnership that operates a large cable system in Florida. As of
March 31, 1999, the broadband networks for this system passed in front of
949,122 homes and served 650,858 basic subscribers.

      Through our subsidiary, Hyperion Telecommunications, Inc., we own and
operate a large competitive local exchange carrier in the eastern United States.
This means that Hyperion provides its customers with alternatives to the
incumbent local telephone company for local telephone and telecommunications
services. Hyperion's telephone operations are referred to as being facilities
based, which means it generally owns the local telecommunications networks and
facilities it uses to deliver these services, rather than leasing or renting the
use of another party's networks to do so. As of March 31, 1999, Hyperion managed
and operated telecommunications networks serving 39 metropolitan statistical
areas. Hyperion's Class A common stock is listed on the Nasdaq National Market
under the symbol "HYPT."

                                       1
<PAGE>

      Our executive offices are located at Main at Water Street, Coudersport,
Pennsylvania 16915, and our telephone number is (814) 274-9830.

Recent Developments

     On May 26, 1999, Adelphia announced that it has agreed to exchange certain
cable systems with Comcast Corporation and Jones Intercable, Inc. in a
geographic rationalization of the companies' respective markets. As a result of
this transaction, Adelphia would add approximately 440,000 subscribers in Los
Angeles, California and West Palm/Fort Pierce, Florida. In exchange, Comcast and
Jones would receive systems currently owned, managed or under contract to be
purchased by Adelphia serving approximately 464,000 subscribers in suburban
Philadelphia, Pennsylvania, Ocean County, New Jersey, Ft. Myers, Florida,
Michigan, New Mexico and Indiana. All systems involved in the transactions will
be valued by agreement between the parties or, following a failure to reach
agreement, by independent appraisals, and any difference in relative value will
be funded with cash or additional cable systems. The system exchanges are
subject to customary closing conditions and regulatory approvals and are
expected to close by mid-2000.

     For other recent developments regarding Adelphia, we refer you to our most
recent and future filings under the Exchange Act.

                                       2
<PAGE>

                                 RISK FACTORS

     Before you invest in our Class A common stock, you should be aware that
there are various risks associated with investing in Adelphia, including those
described below. You should carefully consider these risk factors together with
all of the other information included or incorporated by reference in this
prospectus before you decide to purchase shares of Adelphia's Class A common
stock.

HIGH LEVEL OF INDEBTEDNESS                  Adelphia has a substantial amount of
                                            debt. We borrowed this money to
                                            purchase and to expand our cable
     As of March 31, 1999, we owed          systems and other operations and,
approximately $3.6 billion and as of that   to a lesser extent, for investments
date we would have owed approximately       and loans to our affiliates. At
$5.6 billion after the acquisition of       March 31, 1999, our indebtedness
Century, $6.8 billion after the             totaled approximately $3.6 billion.
acquisition of Century and FrontierVision   This included approximately:
and $7.9 billion after such transactions
and the acquisitions of Harron and          .  $2.1 billion of Adelphia Parent
Telesat's interests in Olympus. Our high       Company public debt. When we use
level of indebtedness can have important       the term "Adelphia Parent
adverse consequences to us and to you.         Company" in this prospectus, we
                                               are referring only to Adelphia
                                               Communications Corporation as a
                                               parent holding company entity,
                                               and not to its subsidiaries;

                                            .  $754 million of debt owed by our
                                               subsidiaries to banks, other
                                               financial institutions and other
                                               persons; and

                                            .  $779 million of public debt owed
                                               by Hyperion, Adelphia's
                                               subsidiary which is a competitive
                                               local exchange carrier
                                               subsidiary.

                                            Olympus, a non-consolidated joint
                                            venture, also had approximately $550
                                            million of debt at March 31, 1999.
                                            Olympus will be consolidated with
                                            Adelphia upon completion of
                                            Adelphia's proposed acquisition of
                                            Telesat's equity interests in
                                            Olympus. That acquisition is
                                            expected to close during the third
                                            quarter of 1999.

     We may need to refinance significant   Century and its subsidiaries have
Century indebtedness that we will be        substantial indebtedness. At
assuming.                                   February 28, 1999, Century and its
                                            subsidiaries had long-term debt of
                                            approximately $2.0 billion
                                            (exclusive of current maturities of
                                            $20.1 million), including
                                            approximately $1.9 billion principal
                                            amount of public indebtedness under
                                            nine indentures, $97 million of
                                            indebtedness under four credit
                                            agreements entered into by
                                            subsidiaries of Century and various
                                            banks and $80 million of
                                            indebtedness under a note agreement
                                            entered into by a subsidiary of
                                            Century.

                                       3
<PAGE>

                                            Under the indentures for Century's
                                            public notes, the merger will
                                            require Century to make an offer to
                                            purchase the public notes if the
                                            merger results in the public notes
                                            being downgraded to a specified
                                            level by certain national rating
                                            agencies. Upon announcement of the
                                            merger, certain rating agencies
                                            announced that the Century notes
                                            were under review with a view to a
                                            downgrade to a level which would not
                                            require Century to make an offer to
                                            repurchase public notes. In the
                                            event that the public notes were to
                                            be downgraded to a level beyond that
                                            announced by the rating agencies
                                            upon disclosure of the merger,
                                            Century would be required to make an
                                            offer to repurchase the public notes
                                            at 101% of the principal amount of
                                            the notes. In the event that a
                                            significant amount of notes were
                                            tendered to Century for repurchase,
                                            this could materially decrease
                                            Adelphia's liquidity.

                                            Without a consent from the lenders
                                            to Century's subsidiaries, the
                                            Century merger will violate certain
                                            covenants contained in the Century
                                            credit agreements. As a result, we
                                            will either secure a waiver from the
                                            lenders under these credit
                                            agreements or will refinance such
                                            credit agreements with new or
                                            existing credit facilities. Although
                                            we currently have sufficient
                                            liquidity under our existing credit
                                            facilities to refinance the
                                            borrowings under Century's credit
                                            agreements, Adelphia is seeking
                                            consents to keep some or all of such
                                            credit agreements in place. In the
                                            event that these consents cannot be
                                            obtained upon reasonable terms, we
                                            could seek to refinance some or all
                                            of them under one or more new
                                            facilities in order to preserve our
                                            existing liquidity. There can be no
                                            assurance, however, that we will be
                                            able to obtain these consents or
                                            refinance these credit agreements
                                            under any terms or on terms
                                            acceptable to Adelphia. As a result,
                                            the failure to obtain the required
                                            consents or to refinance these
                                            credit agreements could materially
                                            decrease Adelphia's liquidity.

                                       4
<PAGE>

     We may need to refinance significant   On February 23, 1999, we announced
FrontierVision indebtedness that we will    our proposed acquisition of
be assuming.                                FrontierVision. FrontierVision and
                                            its subsidiaries have substantial
                                            indebtedness. At March 31, 1999,
                                            FrontierVision and its subsidiaries
                                            had nonaffiliate long-term debt of
                                            approximately $1.1 billion,
                                            including approximately $668 million
                                            owed to banks under a credit
                                            agreement and approximately $456
                                            million owed under three indentures
                                            for public notes. We are attempting
                                            to secure consents and waivers from
                                            the lenders to permit the credit
                                            agreement to remain outstanding. As
                                            a result of the acquisition by
                                            Adelphia, the indentures for the
                                            public debt will require
                                            FrontierVision to make an offer to
                                            repurchase the public notes at 101%
                                            of the amount of the public notes.
                                            In the event that the lenders do not
                                            consent to permitting the credit
                                            agreement to remain outstanding or a
                                            significant amount of the public
                                            notes are tendered to FrontierVision
                                            for repurchase, then this could
                                            materially decrease our liquidity.

     We will need to raise significant      We will need to raise significant
financing for the                           funds to pay for the $1.17 billion
Harron acquisition.                         acquisition of Harron. This may
                                            result in a material amount of
                                            additional indebtedness.

                                            The indebtedness resulting from the
                                            acquisitions of Century,
                                            FrontierVision, Harron and Telesat's
                                            interests in Olympus is reflected in
                                            Adelphia's unaudited condensed
                                            consolidated pro forma financial
                                            statements incorporated by reference
                                            in this prospectus.

     Debt service consumes a substantial    Our high level of indebtedness can
portion of the cash we generate. This       have important adverse consequences
could affect our ability to invest in our   to us and to you. It requires that
business in the future as well as to        we spend a substantial portion of
react to changes in our industry or         the cash we get from our business to
economic downturns.                         repay the principal and interest on
                                            these debts. Otherwise, we could use
                                            these funds for general corporate
                                            purposes or for capital
                                            improvements. Our ability to obtain
                                            new loans for working capital,
                                            capital expenditures, acquisitions
                                            or capital improvements may be
                                            limited by our current level of
                                            debt. In addition, having such a
                                            high level of debt could limit our
                                            ability to react to changes in our
                                            industry and to economic conditions
                                            generally. In addition to our debt,
                                            at March 31, 1999, the Adelphia
                                            Parent Company had approximately
                                            $148 million and Hyperion had
                                            approximately $236 million of
                                            redeemable exchangeable preferred
                                            stock which contain payment
                                            obligations that are similar to
                                            Adelphia's debt obligations.

                                       5
<PAGE>

     Approximately 35% of our debt          Our debt comes due at various times
outstanding at March 31, 1999 must be       up to the year 2009, including an
paid by January 1, 2004 and all of it       aggregate of approximately $1.3
must be paid by 2009.                       billion as of March 31, 1999, which
                                            we must pay by January 1, 2004.

                                            As discussed above, Century,
                                            FrontierVision and Olympus also have
                                            a substantial amount of debt. Under
                                            their current terms, these debts
                                            come due at various times up to the
                                            year 2017, including an aggregate of
                                            approximately $1.5 billion as of
                                            March 31, 1999 (May 31, 1998 as to
                                            Century), which must be paid over
                                            the next five years.

OUR BUSINESS REQUIRES SUBSTANTIAL           Our business requires substantial
ADDITIONAL FINANCING AND IF WE DO NOT       additional financing on a continuing
OBTAIN THAT FINANCING WE MAY NOT BE ABLE    basis for capital expenditures and
TO UPGRADE OUR PLANT, OFFER SERVICES,       other purposes including:
MAKE PAYMENTS WHEN DUE OR REFINANCE
EXISTING DEBT                               .    constructing and upgrading our
                                                 plant and networks some of
                                                 these upgrades we must make to
                                                 comply with the requirements of
                                                 local cable franchise
                                                 authorities;

                                            .    offering new services;

                                            .    scheduled principal and
                                                 interest payments;

                                            .    refinancing existing debt; and

                                            .    acquisitions and investments.

                                            There can be no guarantee that we
                                            will be able to issue additional
                                            debt or sell stock or other
                                            additional equity on satisfactory
                                            terms, or at all, to meet our future
                                            financing needs.

                                       6
<PAGE>

WE HAVE HAD LARGE LOSSES AND WE EXPECT      The total convertible preferred
THIS TO CONTINUE                            stock, common stock and other
                                            stockholders' equity (deficiency) at
                                            March 31, 1999 was a deficit of
                                            approximately $728.4 million. Our
                                            continuing net losses, which are
                                            mainly due to our high levels of
                                            depreciation and amortization and
                                            interest expense, have created this
                                            deficiency. Our recent net losses
                                            applicable to our common
                                            stockholders were approximately as
                                            follows:

                                            .  fiscal year ended March 31,
                                               1997 $130.6 million;

                                            .  fiscal year ended March 31,
                                               1998 $192.7 million;

                                            .  nine months ended December 31,
                                               1998 $135.8 million; and

                                            .  three months ended March 31,
                                               1999 $50.3 million.

                                            We expect to continue to incur large
                                            net losses for the next several
                                            years.

     Our earnings have been insufficient    Our earnings could not pay for our
to pay for our fixed charges and            combined fixed charges and preferred
preferred stock dividends.                  stock dividends during these periods
                                            by the amounts set forth in the
                                            table below. Combined fixed charges
                                            and preferred stock dividends
                                            included substantial non-cash
                                            charges for depreciation,
                                            amortization and non-cash interest
                                            expense on some of our debts and the
                                            non-cash expense of Hyperion's
                                            preferred stock dividends:

<TABLE>
<CAPTION>
                                                                                       Earnings     Non-Cash
                                                                                       --------     --------
                                                                                      Deficiency    Charges
                                                                                      ----------    -------
                                                                                         (in thousands)
                                            <S>                                       <C>           <C>
                                            .  fiscal year ended March 31, 1997       $  61,848     $ 165,426
                                            .  fiscal year ended March 31, 1998       $ 113,941     $ 195,153
                                            .  nine months ended December 31, 1998    $ 116,899     $ 186,022
                                            .  three months ended March 31, 1999      $  42,585     $  72,386
</TABLE>

                                       7
<PAGE>

     If we cannot refinance our debt,       Historically, the cash we generate
including debt incurred in connection       from our operating activities and
with the pending acquisitions of            borrowings has been sufficient to
FrontierVision, Century, Harron and         meet our requirements for debt
Telesat's interests in Olympus, or obtain   service, working capital, capital
new loans, we would likely have to          expenditures and investments in and
consider various options. We cannot         advances to our affiliates, and we
guarantee that any options available to     have depended on additional
us would enable us to repay our debt in     borrowings to meet our liquidity
full.                                       requirements. Although in the past
                                            we have been able both to refinance
                                            our debt and to obtain new debt,
                                            there can be no guarantee that we
                                            will be able to continue to do so in
                                            the future or that the cost to us or
                                            the other terms which would affect
                                            us would be as favorable to us as
                                            current loans and credit agreements.
                                            Under these circumstances, we may
                                            need to consider various financing
                                            options, such as the sale of
                                            additional equity or some of our
                                            assets to meet the principal and
                                            interest payments we owe, negotiate
                                            with our lenders to restructure
                                            existing loans or explore other
                                            options available under applicable
                                            laws including those under
                                            reorganization or bankruptcy laws.
                                            We believe that our business will
                                            continue to generate cash and that
                                            we will be able to obtain new loans
                                            to meet our cash needs. However, the
                                            covenants in the indentures and
                                            credit agreements for our current
                                            debt provide some limitations on our
                                            ability to borrow more money.

COMPETITION                                 The telecommunications services
                                            provided by Adelphia are subject to
                                            strong competition and potential
                                            competition from various sources.

                                       8
<PAGE>

     Our cable television business is      Our cable television systems compete
subject to strong competition from         with other means of distributing
several sources which could adversely      video to home televisions such as
affect revenue or revenue growth.          Direct Broadcast Satellite systems,
                                           commonly known as DBS systems, and
                                           Multichannel Multipoint Distribution
                                           systems, commonly known as wireless
                                           cable. Some of the regional Bell
                                           telephone operating companies and
                                           other local telephone companies are
                                           in the process of entering the video
                                           to-home business and several have
                                           expressed their intention to enter
                                           the video-to-home business.

                                           In addition, because Adelphia's
                                           systems are operated under non-
                                           exclusive franchises, other
                                           applicants may obtain franchises in
                                           Adelphia franchise areas. For
                                           example, some regional Bell operating
                                           companies and local telephone
                                           companies have facilities which are
                                           capable of delivering cable
                                           television service and could seek
                                           competitive franchises.

                                           The equipment which telephone
                                           companies use in providing local
                                           exchange service may give them
                                           competitive advantages over Adelphia
                                           in distributing video to home
                                           televisions. The regional Bell
                                           operating companies and other
                                           potential competitors have much
                                           greater resources than Adelphia and
                                           would constitute formidable
                                           competition for our cable television
                                           business. We cannot predict either
                                           the extent to which competition will
                                           continue to materialize or, if such
                                           competition materializes, the extent
                                           of its effect on our cable television
                                           business.

                                       9
<PAGE>

                                            Our cable television systems also
                                            face competition from other
                                            communications and entertainment
                                            media, including conventional off-
                                            air television broadcasting
                                            services, newspapers, movie
                                            theaters, live sporting events and
                                            home video products. We cannot
                                            predict the extent to which
                                            competition may affect us.

                                            Adelphia's cable modem and dial up
                                            Internet access business is subject
                                            to strong competition and potential
                                            competition from a number of
                                            sources. With respect to high speed
                                            cable modem service, telephone
                                            companies are beginning to implement
                                            various digital subscriber line
                                            services (DSL) that allow high
                                            speed Internet access services to be
                                            offered over telephone lines. DBS
                                            companies offer high speed Internet
                                            access over their satellite
                                            facilities and other terrestrial
                                            based wireless operators (e.g.,
                                            MMDS) are beginning to introduce
                                            high speed access as well. With
                                            respect to dial up Internet access
                                            services, there are numerous
                                            competitive Internet Service
                                            Providers (ISPs) in virtually every
                                            franchise area. The local telephone
                                            exchange company typically offers
                                            ISP services, as do a number of
                                            other nationally marketed ISPs such
                                            as America Online, Compuserve and
                                            AT&T Worldnet. Adelphia cannot
                                            predict the extent to which
                                            competition will continue to
                                            materialize or, if such competition
                                            materializes, the extent of its
                                            effect on Adelphia's Internet access
                                            business.

     Hyperion's operations are also         In each of the markets served by
subject to risk because Hyperion competes   Hyperion's networks, the competitive
principally with established local          local exchange carrier services
telephone carriers that have                offered by Hyperion compete
long-standing utility relationships with    principally with the services
their customers and pricing flexibility     offered by the incumbent local
for local telephone services.               telephone exchange carrier company
                                            serving that area. Local telephone
                                            companies have long-standing
                                            relationships with their customers,
                                            have the potential to subsidize
                                            competitive services from monopoly
                                            service revenues, and benefit from
                                            favorable state and federal
                                            regulations. The merger of Bell
                                            Atlantic and NYNEX created a very
                                            large company whose combined
                                            territory covers a substantial
                                            portion of Hyperion's markets. Other
                                            combinations are occurring in the
                                            industry, which may have a material
                                            adverse effect on Hyperion and us.

                                       10
<PAGE>

                                            We believe that local telephone
                                            companies will gain increased
                                            pricing flexibility from regulators
                                            as competition increases. Hyperion's
                                            operating results and cash flow
                                            could be materially and adversely
                                            affected by actions by regulators,
                                            including permitting the incumbent
                                            local telephone companies in
                                            Hyperion's markets to do the
                                            following:


                                            .  lower their rates substantially;

                                            .  engage in aggressive volume and
                                               term discount pricing practices
                                               for their customers; or

                                            .  charge excessive fees to Hyperion
                                               for interconnection to the
                                               incumbent local telephone
                                               company's networks.

     If the regional Bell telephone         The regional Bell operating
companies could get regulatory approval     companies can now obtain regulatory
to offer long distance service in           approval to offer long distance
competition with Hyperion's significant     services if they comply with the
customers, some of Hyperion's major         interconnection requirements of the
customers could lose market share.          federal Telecommunications Act of
                                            1996. To date, the FCC has denied
                                            the requests for approval filed by
                                            regional Bell operating companies in
                                            Hyperion's operating areas. However,
                                            approval of such a request could
                                            result in decreased market share for
                                            the major long distance carriers
                                            which are among Hyperion's
                                            significant customers. This could
                                            have a material adverse effect on
                                            Hyperion.

     The regional Bell telephone            Legislation has been introduced in
companies continue to seek legislation      Congress proposing to relieve the
that could significantly enhance their      regional Bell operating companies
competitive position against Hyperion.      from the resale and unbundling
                                            requirements of the federal
                                            Telecommunications Act of 1996 with
                                            respect to high speed data services,
                                            and to otherwise facilitate the
                                            deployment of such services. The
                                            adoption of such legislation by
                                            Congress could have a material
                                            adverse effect on Hyperion.

                                       11
<PAGE>

     Potential competitors to Hyperion's    Potential competitors for Hyperion
telecommunications services include the     include other competitive local
regional Bell telephone companies, AT&T,    exchange carriers, incumbent local
MCIWorldCom and Sprint, electric            telephone companies which are not
utilities and other companies that have     subject to regional Bell operating
advantages over Hyperion.                   companies' restrictions on offering
                                            long distance service, AT&T,
                                            MCIWorldCom, Sprint and other long
                                            distance carriers, cable television
                                            companies, electric utilities,
                                            microwave carriers, wireless
                                            telecommunications providers,
                                            including cellular and Personal
                                            Communication Services (PCS), and
                                            private networks built by large end
                                            users. Both AT&T and MCIWorldCom
                                            have announced that they have begun
                                            to offer local telephone services in
                                            some areas of the country, and AT&T
                                            recently announced a new wireless
                                            technology for providing local
                                            telephone service. In addition, the
                                            long distance carriers could build
                                            their own facilities, purchase other
                                            carriers or their facilities, or
                                            resell the services of other
                                            carriers rather than use Hyperion's
                                            services when entering the market
                                            for local exchange services.

                                            Many of Hyperion's current and
                                            potential competitors, particularly
                                            incumbent local telephone companies,
                                            have financial, personnel and other
                                            resources substantially greater than
                                            those of Hyperion, as well as other
                                            competitive advantages over
                                            Hyperion.

                                       12
<PAGE>

<TABLE>
<S>                                         <C>
WE ARE SUBJECT TO EXTENSIVE REGULATION      The cable television industry and the provision of local telephone
                                            exchange services are subject to extensive regulation at the federal,
     Our cable television and               state and local levels, and many aspects of such regulation are
telecommunications businesses are heavily   currently the subject of judicial proceedings and administrative or
regulated as to rates we can charge and     legislative proposals. In particular, the FCC adopted regulations that
other matters. This regulation could        limit our ability to set and increase rates for our basic service
limit our ability to increase rates,        package and for the provision of cable television-related equipment.
cause us to decrease then current rates     The law permits certified local franchising authorities to order
or require us to refund previously          refunds of rates paid in the previous 12-month period determined to be
collected fees.                             in excess of the permitted reasonable rates. It is possible that rate
                                            reductions or refunds of previously collected fees may be required in
                                            the future.  In addition, the FCC has commenced a proceeding to
                                            determine whether cable operators will be required to carry the digital
                                            signals of broadcast television stations.  Such a requirement could
                                            require the removal of popular programming services with materially
                                            adverse results for cable operators.

                                            Adelphia must comply with rules of the local franchising authorities to
                                            retain and renew its cable franchises, among other matters.  There can
                                            be no assurances that the franchising authorities will not impose new
                                            and more restrictive requirements as a condition to franchise renewal.
                                            Similarly, Hyperion is subject to state and local regulations and in
                                            some cases must obtain appropriate certifications and/or local
                                            franchises to construct facilities and offer services.  There can be no
                                            assurance that Hyperion's state and local regulators will not impose
                                            new and more restrictive requirements as a condition to renew any
                                            required certifications and franchises.
</TABLE>

                                       13
<PAGE>

<TABLE>
<S>                                         <C>
     The federal Telecom-munications Act    The federal Telecommunications Act of 1996 substantially changed
of 1996 may have a significant impact on    federal, state and local laws and regulations governing our cable
our cable television and telephone          television and telecommunications businesses. This law could materially
businesses.                                 affect the growth and operation of the cable television industry and
                                            the cable services we provide. Although this legislation may lessen
                                            regulatory burdens, the cable television industry may be subject to new
                                            competition as a result. There are numerous rulemakings that have been
                                            and continue to be undertaken by the FCC which will interpret and
                                            implement the provisions of this law. Furthermore, portions of this law
                                            have been, and likely other portions will be, challenged in the courts.
                                            We cannot predict the outcome of such rulemakings or lawsuits or the
                                            short- and long-term effect, financial or otherwise, of this law and
                                            FCC rulemakings on us.

                                            Similarly, the federal Telecommunications Act of 1996 removes entry
                                            barriers for all companies and could increase substantially the number
                                            of competitors offering comparable services in Hyperion's markets or
                                            potential markets. Furthermore, we cannot guarantee that rules adopted
                                            by the FCC or state regulators or other legislative or judicial
                                            initiatives relating to the telecommunications industry will not have a
                                            material adverse effect on Hyperion.

UNEQUAL VOTING RIGHTS OF STOCKHOLDERS       Adelphia has two classes of common stock--Class A common stock which
                                            carries one vote per share and Class B common stock which carries ten
                                            votes per share. Under Adelphia's Certificate of Incorporation, the
                                            shares of Class A common stock elect only one of our eight directors.
</TABLE>

                                       14
<PAGE>

<TABLE>
<S>                                         <C>
CONTROL OF VOTING POWER BY THE RIGAS        As of June 1, 1999, the Rigas family beneficially owned shares
FAMILY                                      representing about 42% of the total number of outstanding shares of
                                            both classes of Adelphia's common stock and about 77% of the total
     The Rigas family can control           voting power of Adelphia's shares. The public holds a majority of the
stockholder decisions on very important     outstanding shares of Class A common stock, although the Rigas family
matters.                                    also owns approximately 30% of those shares as of June 1, 1999. The
                                            Rigas family owns approximately 99% of Adelphia's shares of Class B
                                            common stock. The Rigas family also owns shares of Adelphia's 8 1/8%
                                            Series C cumulative convertible preferred stock which, if converted,
                                            would increase its voting power and beneficial ownership. The Rigas
                                            family also has agreed to acquire 4,114,549 shares of Class B common
                                            stock, and has rights to acquire up to an additional 2,057,275 shares
                                            of Class B common stock, which if purchased would increase its
                                            beneficial ownership and voting power. As a result of the Rigas
                                            family's stock ownership and an agreement among the Class B
                                            stockholders, members of the Rigas family as of June 1, 1999 have the
                                            power to elect seven of eight Adelphia directors, and if they converted
                                            their convertible preferred stock might be able to elect all eight
                                            directors. In addition, the Rigas family could control stockholder
                                            decisions on other matters such as amendments to Adelphia's Certificate
                                            of Incorporation and Bylaws, and mergers or other fundamental corporate
                                            transactions.

THERE ARE POTENTIAL CONFLICTS OF INTEREST   John J. Rigas and the other executive officers of Adelphia, including
BETWEEN ADELPHIA AND THE RIGAS FAMILY       other members of the Rigas family, own other corporations and
                                            partnerships, which are managed by us for a fee. Subject to the
                                            restrictions contained in a business opportunity agreement regarding
                                            future acquisitions, Rigas family members and the executive officers
                                            are free to continue to own these interests and acquire additional
                                            interests in cable television systems. These activities could present a
                                            conflict of interest with Adelphia, such as how much time our executive
                                            officers devote to our business. In addition, there have been and will
                                            continue to be transactions between us and the executive officers or
                                            the other entities they own or have affiliations with. Our public debt
                                            indentures contain covenants that place some restrictions on
                                            transactions between us and our affiliates.
</TABLE>

                                       15
<PAGE>

<TABLE>
<S>                                         <C>
HOLDING COMPANY STRUCTURE AND POTENTIAL     The Adelphia Parent Company directly owns no significant assets other
IMPACT OF RESTRICTIVE COVENANTS IN          than stock, partnership interests and equity and other interests in our
SUBSIDIARY DEBT AGREEMENTS                  subsidiaries and in other companies. This creates risks regarding our
                                            ability to provide cash to the Adelphia Parent Company to repay the
                                            interest and principal which it owes, our ability to pay cash dividends
                                            to our common stockholders in the future, and the ability of our
                                            subsidiaries and other companies to respond to changing business and
                                            economic conditions and to get new loans.

     The Adelphia Parent Company depends    The public indentures and the credit agreements for bank and other
on its subsidiaries and other companies     financial institution loans of our subsidiaries and other companies in
in which it has investments to fund its     which we have invested, restrict their ability and the ability of the
cash needs.                                 companies they own to make payments to the Adelphia Parent Company.
                                            These agreements also place other restrictions on the borrower's
                                            ability to borrow new funds and include requirements for the borrowers
                                            to remain in compliance with the credit agreements. The ability of a
                                            subsidiary or a company in which we have invested to comply with debt
                                            restrictions may be affected by events that are beyond our control. The
                                            breach of any of these covenants could result in a default which could
                                            result in all loans and other amounts owed to its lenders becoming due
                                            and payable. Our subsidiaries and companies in which we have invested
                                            might not be able to repay in full the accelerated loans.

IT IS UNLIKELY YOU WILL RECEIVE A RETURN    Adelphia has never declared or paid cash dividends on any of its common
ON YOUR SHARES THROUGH THE PAYMENT OF       stock and has no intention of doing so in the foreseeable future. As a
CASH DIVIDENDS                              result, it is unlikely that you will receive a return on your shares
                                            through the payment of cash dividends.

FUTURE SALES OF ADELPHIA COMMON STOCK       Sales, or availability for sale, of a substantial number of shares of
COULD ADVERSELY AFFECT ITS MARKET PRICE     our common stock, including sales by any pledgees of such shares, could
                                            adversely affect the market price of Class A common stock and could
                                            impair our ability in the future to raise capital through stock
                                            offerings.
</TABLE>

                                       16
<PAGE>

                         Under various registration rights agreements or
                         arrangements, as of June 1, 1999, the Rigas family has
                         the right, subject to some limitations, to require
                         Adelphia to register substantially all of the shares
                         which it owns of Class A common stock, consisting of
                         15,029,119 shares, Class B common stock, consisting of
                         10,736,544 shares and the equivalent number of shares
                         of Class A common stock into which they may be
                         converted, and Series C cumulative convertible
                         preferred stock, consisting of 80,000 shares and the
                         9,433,962 shares of Class A common stock into which
                         they may be converted. Among others, Adelphia has
                         registered or agreed to register for public sale the
                         following shares:

                         .   for the Rigas family--up to 11,000,000 shares of
                             Class A common stock, 80,000 shares of Series C
                             cumulative convertible preferred stock and the
                             Class A common stock issuable upon conversion of
                             the Series C cumulative convertible preferred
                             stock;

                         .   for Booth American Company--3,571,428 shares of
                             Class A common stock owned as of March 24, 1998;

                         .   for the selling stockholders receiving shares in
                             the Verto Communications, Inc. acquisition--2,561,
                             024 shares of Class A common stock;

                         .   for a Rigas family partnership--4,000,000 shares of
                             Class A common stock purchased by it in connection
                             with the January 14, 1999 equity offerings;

                         .   for the owners of FrontierVision--7,000,000 shares
                             of Class A common stock in connection with the
                             pending FrontierVision acquisition and 1,000,000
                             shares of Class A common stock held in connection
                             with an escrow arrangement for the benefit of
                             FrontierVision in certain circumstances if the
                             transaction does not close;

                         .   for the owners of Century--approximately 48,700,000
                             shares of Class A common stock to be issued in
                             connection with the pending Century acquisition;
                             and

                          .  for TCI Development Corporation (or its successors)
                             2,250,000 shares.

                                       17
<PAGE>

<TABLE>
<S>                                         <C>
                                            Approximately 14,904,000 shares of Class A common stock and up to
                                            80,000 shares of Series C cumulative convertible preferred stock,
                                            including the underlying Class A common stock, have been pledged by
                                            members of the Rigas family in connection with margin loans made to
                                            members of the Rigas family. These pledgees could freely sell any
                                            shares acquired upon a foreclosure.

THE CENTURY MERGER MAY NOT BE COMPLETED     The Century merger requires approvals from Century's stockholders and
IF THE REQUIRED APPROVAL OF CENTURY'S       our stockholders. Although the Class B stockholders of Century and the
CLASS A STOCKHOLDERS IS NOT OBTAINED        controlling stockholders of Adelphia have agreed to vote in favor of
                                            the merger, the companies cannot be certain of the ultimate outcome of
                                            the required vote of the Class A stockholders of Century. If that vote
                                            is not obtained, the companies will not be able to complete the
                                            proposed transaction as currently structured or in a timely manner, if
                                            at all.

     The failure to satisfy conditions to   Even if Century's stockholders approve the Century merger, one or more
completion of the acquisitions could        of the pending acquisitions may not close unless several other
jeopardize the acquisitions.                conditions are met. These include:

                                            .  receipt of all required consents of governmental authorities
                                               have been received, except where the failure to obtain any such
                                               required consent would not have a material adverse effect;

                                            .  clearance under antitrust laws;

                                            .  neither Adelphia nor the selling parties have breached any of
                                               their respective representations, warranties or covenants made in
                                               the applicable agreement; and

                                            .  there is no law or court order prohibiting the applicable
                                               acquisition.
</TABLE>

                                       18
<PAGE>

<TABLE>
<S>                                         <C>
OUR ACQUISITIONS AND EXPANSION COULD        Because we are experiencing a period of rapid expansion through
INVOLVE OPERATIONAL AND OTHER RISKS         acquisition, the operating complexity of Adelphia, as well as the
                                            responsibilities of management personnel, have increased. Our ability
                                            to manage such expansion effectively will require us to continue to
                                            expand and improve our operational and financial systems and to expand,
                                            train and manage our employee base.

                                            The Century, FrontierVision and Harron transactions and some of our
                                            other recent acquisitions involve the acquisition of companies that
                                            have previously operated independently. We may not be able to integrate
                                            the operations of these companies without some level of difficulty,
                                            such as the loss of key personnel. There is no guarantee that we will
                                            be able to realize the benefits expected from the integration of
                                            operations from these transactions.

                                            Because the cable systems to be acquired in the Century, FrontierVision
                                            and Harron acquisitions are in the same industry as those of Adelphia,
                                            the acquired systems will generally be subject to the same risks as
                                            those of Adelphia, such as those relating to competition, regulation,
                                            year 2000 issues and technological developments.

PURCHASERS OF OUR COMMON STOCK WILL INCUR   Persons purchasing Class A common stock will incur immediate and
IMMEDIATE DILUTION                          substantial net tangible book value dilution.
</TABLE>

                                       19
<PAGE>

<TABLE>
<S>                                         <C>
YEAR 2000 ISSUES PRESENT RISKS TO OUR       The year 2000 issue refers to the potential inability of computerized
BUSINESS OPERATIONS IN SEVERAL WAYS         systems and technologies to properly recognize and process dates beyond
                                            December 31, 1999. This could present risks to the operation of our
                                            business in several ways. Our computerized business applications that
                                            could be adversely affected by the year 2000 issue include:

                                            .  information processing and financial reporting systems;

                                            .  customer billing systems;

                                            .  customer service systems;

                                            .  telecommunication transmission and reception systems; and

                                            .  facility systems.

                                            System failure or miscalculation could result in an inability to
                                            process transactions, send invoices, accept customer orders or provide
                                            customers with products and services. Although we are evaluating the
                                            impact of the year 2000 issue on our business and are seeking to
                                            implement necessary solutions, this process has not been completed.

                                            There can be no assurance that the systems of other companies on which
                                            our systems rely will be year 2000 ready.   The systems of other
                                            companies also could become incompatible with Adelphia's systems as a
                                            result of implementation of year 2000 solutions.  Our failure or a
                                            third-party's failure to become year 2000 ready, or our inability to
                                            become compatible with third parties with which we have a material
                                            relationship, including parties acquired by us, may have a material
                                            adverse effect on Adelphia, including significant service interruption
                                            or outages; however, we cannot currently estimate the extent of any
                                            such adverse effects.
</TABLE>

                                       20
<PAGE>

<TABLE>
<S>                                         <C>
FORWARD-LOOKING STATEMENTS IN THIS          The statements contained or incorporated by reference in this
PROSPECTUS ARE SUBJECT TO RISKS AND         prospectus that are not historical facts are "forward-looking
UNCERTAINTIES                               statements" and can be identified by the use of forward-looking
                                            terminology such as "believes," "expects," "may," "will,"
                                            "should," "intends" or "anticipates" or the negative thereof or
                                            other variations thereon or comparable terminology, or by discussions
                                            of strategy that involve risks and uncertainties.

                                            Certain information set forth or incorporated by reference in this
                                            prospectus, including "Management's Discussion and Analysis of
                                            Financial Condition and Results of Operations" in Adelphia's
                                            Transition Report on Form 10-K for the nine months ended December 31,
                                            1998 and in Adelphia's Form 10-Q, is forward-looking, such as
                                            information related to the effects of future regulation, future capital
                                            commitments and the effects of competition. Such forward-looking
                                            information involves important risks and uncertainties that could
                                            significantly affect expected results in the future from those
                                            expressed in any forward-looking statements made by, or on behalf of,
                                            us. These risks and uncertainties include, but are not limited to,
                                            uncertainties relating to economic conditions, the availability and
                                            cost of capital, acquisitions and divestitures, government and
                                            regulatory policies, the pricing and availability of equipment,
                                            materials, inventories and programming, technological developments,
                                            year 2000 issues and changes in the competitive environment in which we
                                            operate. Persons reading this prospectus are cautioned that such
                                            statements are only predictions and that actual events or results may
                                            differ materially. In evaluating such statements, readers should
                                            specifically consider the various factors which could cause actual
                                            events or results to differ materially from those indicated by such
                                            forward-looking statements.
</TABLE>

                                       21
<PAGE>

                                   DILUTION

      The net tangible book value of Adelphia's common stock as of March 31,
1999 was a deficit of approximately $1,884,830,000 or negative $36.13 a share.
Net tangible book value per share represents the amount of Adelphia's
convertible preferred stock, common stock and other stockholders' equity
(deficiency), less intangible assets, divided by shares of Adelphia's common
stock outstanding. Purchasers of Class A common stock will have an immediate
dilution of net tangible book value which, due to our having a net tangible book
value deficit, will exceed the purchase price per share. For example, in the
April 28, 1999 Class A common stock offering, the purchase price of a single
share initially sold to the public was $61.75 and the net tangible book value
dilution per share was $82.40 based on net tangible book value as of
December 31, 1998. Net tangible book value dilution per share represents the
difference between the amount per share paid by purchasers of shares of Class A
common stock in an offering by Adelphia and the pro forma net tangible book
value per share of the common stock immediately after completion of such
offering.

                             SELLING STOCKHOLDERS

      The 7,000,000 shares offered under this prospectus have been issued to the
former owners of FrontierVision Partners, L.P. Adelphia, FrontierVision
Partners, L.P. and others are parties to the FrontierVision purchase agreement
and the related registration rights agreement. Under the purchase agreement and
registration rights agreement, Adelphia agreed prior to the closing of that
transaction to register 7,000,000 shares of Class A common stock for sale under
this prospectus. These 7,000,000 shares were issued as part of the closing of
the FrontierVision acquisition to the owners of FrontierVision as part of the
purchase price paid to them for their interest in FrontierVision Partners, L.P.

      FrontierVision Partners, L.P. is a limited partnership. FrontierVision
Partners, L.P. has a general Partner, FVP GP, L.P., and a number of direct or
indirect limited partners and they and/or their affiliates are, or may also
become, selling stockholders under this prospectus. If required, we would file
an amendment or a prospectus supplement to add additional selling stockholders.
Registration of these shares does not necessarily mean that the selling
stockholders will sell all or any of the shares.

      Neither FrontierVision Partners, L.P. nor any of its former owners has
held any positions or office or had any material relationship with us, our
predecessors or affiliates during the past three years. In addition, one or more
of the selling stockholders may donate, pledge or transfer as gifts some or all
of their shares, or may pledge or transfer its or their shares for no value to
other beneficial owners. This prospectus may also be used for resales by these
pledgees, donees or transferees of the selling stockholder listed below or its
distributees and we will identify any of those pledgees, donees or transferees
in a supplement to this prospectus.

                                       22
<PAGE>

      The shares listed below represent, as of June 17, 1999, all of the shares
that the selling stockholders beneficially own, the number of shares each may
offer and the number of shares each will own after the offering assuming each of
them sells all of their respective shares.

      The numbers presented under "Class A Common Shares Held After Offering"
and "Percent of Class A Common Shares Held After Offering" in the table below
assume that all of the shares held by the selling stockholders and being offered
under this prospectus are sold, and that the selling stockholders acquire no
additional shares of common stock before the completion of this offering.

<TABLE>
<CAPTION>

                                                                                                            Percent of
                                 Class A           Percent of Class                        Class A          Class A
                                 Common            A Common             Class A Common     Common           Common
                                 Shares Held       Shares Held          Shares             Shares Held      Shares Held
Name                             Before Offering   Before Offering      Offered Hereby     After Offering   After Offering
- ----                             ---------------   ---------------      --------------     --------------   --------------
<S>                              <C>               <C>                  <C>                <C>              <C>
All Selling Stockholders            7,000,000          12.43%           7,000,000                ---             ---

Total                               7,000,000          12.43%           7,000,000                ---             ---
                                    =========          =====            =========
</TABLE>

                                USE OF PROCEEDS

      All net proceeds from the sale of the shares will go to the stockholders
who offer and sell them. We will not receive any proceeds from the sale of
shares by the selling stockholders.

                             PLAN OF DISTRIBUTION

      Adelphia is registering the shares on behalf of the selling stockholders.
References in this section to selling stockholders also include any permitted
pledgees, donees or transferees identified in a supplement to this prospectus as
described above. The selling stockholders may offer their shares at various
times in one or more of the following transactions:

      .  in transactions, which may involve crosses or block transactions, on
         any national securities exchange or quotation service on which the
         shares may be listed or quoted at the time of sale;

      .  in the over-the-counter market;

      .  in private transactions other than in the over-the-counter market or on
         an exchange;

      .  in connection with short sales of shares;

      .  by pledge to secure debts and other obligations;

      .  in connection with the writing of non-traded and exchange-traded call
         options, in hedge transactions and in settlement of other transactions
         in standardized or over-the-counter options; or

                                       23
<PAGE>

      .  in a combination of any of the above transactions.

      In addition, pursuant to the registration rights agreement among Adelphia
and the selling stockholders, the selling stockholders are entitled to demand up
to three underwritten offerings on the terms and conditions set forth in the
registration rights ageement. In the event of an underwritten offering and
subject to the terms of the registration rights agreement, Adelphia and the
selling stockholders will enter into an underwriting agreement and other
appropriate agreements with the underwriters participating in the underwritten
offering that will set forth the terms on which the participating underwriters
will effect sales of the shares.

      The selling stockholders may sell their shares at market prices at the
time of sale, at prices related to market prices, at negotiated prices or at
fixed prices.

      The selling stockholders may use underwriters or broker-dealers to sell
their shares. In effecting such sales, underwriters, brokers or dealers engaged
by the selling stockholders may arrange for other underwriters, brokers or
dealers to participate. Underwriters, brokers or dealers may purchase shares as
principals for their own accounts and resell such shares pursuant to this
prospectus. If this happens, the underwriters or broker-dealers will either
receive discounts or commissions from the selling stockholders, or they will
receive commissions from purchasers of shares for whom they acted as agents. The
selling stockholders, any underwriters, brokers, dealers and any other
participating brokers or dealers may be deemed to be "underwriters" within the
meaning of the Securities Act of 1933 in connection with these sales, and any
profits realized or commissions received may be deemed underwriting
compensation.

      The selling stockholders may also enter into hedging transactions with
broker-dealers or other financial institutions. In connection with these
transactions, broker-dealers or other financial institutions may engage in short
sales of Adelphia's Class A common stock in the course of hedging the positions
they assume with selling stockholders. The selling stockholders may also enter
into options or other transactions with broker-dealers or other financial
institutions which require the delivery, to that broker-dealer or other
financial institution, of the shares offered under this prospectus. The shares
that broker-dealers or other financial institutions receive in those types of
transactions may be resold under this prospectus.

      Selling stockholders also may resell all or a portion of the shares in
open market transactions in reliance upon Rule 144 under the Securities Act of
1933, provided they meet the criteria and conform to the requirements of that
Rule.

      An affiliate of J.P. Morgan Investment Corporation, one of the selling
stockholders, has agreed to act as "preferred broker" for the selling
stockholders to effect sales and to make and receive certain notices to Adelphia
on behalf of the selling stockholders as required under the registration rights
agreement.

      When a particular offering of shares is made, if required, we will
distribute a prospectus supplement. This supplement will set forth the names of
the selling stockholders, the aggregate amount and type of shares being offered,
the number of such securities owned prior to and after the completion of any
such offering, and, to the extent required, the terms of the offering, including
the name or names of any underwriters, broker-dealers or agents, any discounts,
commissions and other terms constituting compensation from the selling
stockholders and any discounts, commissions or concessions allowed or reallowed
or paid to broker-dealers.

      To comply with the securities law in some jurisdictions, the shares will
be offered or sold in particular jurisdictions only through registered or
licensed brokers or dealers. In addition, in some jurisdictions the shares may
not be offered or sold unless they have been registered or qualified for sale in
that jurisdictions or an exemption from registration or qualification is
available and is complied with.

      To comply with rules and regulations under the Securities Exchange Act of
1934, persons engaged in a distribution of the shares may be limited in their
ability to engage in market activities with respect to such shares. In addition
and without limiting the foregoing, each selling stockholder will be subject to
applicable provisions of the Securities Exchange Act of 1934 and the rules and
regulations thereunder, which provisions may limit the timing of purchases and

                                       24
<PAGE>

sales of any of the shares by the selling stockholders. All of these things may
affect the marketability of the shares.

      All expenses of the registration of the shares will be paid by Adelphia,
including, without limitation, Commission filing fees and expenses of compliance
with state securities or "blue sky" laws; provided, however, that the selling
stockholders will pay all underwriting discounts and selling commissions, if
any. Subject to some limitations, the selling stockholders will be indemnified
by Adelphia against civil liabilities, including liabilities under the
Securities Act of 1933, or will be entitled to contribution in connection
therewith. Subject to some limitations, Adelphia will be indemnified by the
selling stockholders against civil liabilities, including liabilities under the
Securities Act of 1933, or will be entitled to contribution in connection
therewith.

                      WHERE YOU CAN FIND MORE INFORMATION

      We file annual, quarterly and special reports, as well as proxy statements
and other information with the SEC. You may read and copy any document we file
with the SEC at the SEC's Public Reference Room at 450 Fifth Street, N.W.,
Washington, D.C. 20549 or at its Regional Offices in Chicago, Illinois or New
York, New York. You may obtain further information about the operation of the
Public Reference Room by calling the SEC at 1-800-SEC-0330. Our SEC filings are
also available to the public over the Internet at the SEC's web site at
http://www.sec.gov, which contains reports, proxy statements and other
information regarding registrants like us that file electronically with the SEC.

      This prospectus is part of a registration statement on Form S-3 filed by
us with the SEC under the Securities Act of 1933. As permitted by SEC rules,
this prospectus does not contain all of the information included in the
registration statement and the accompanying exhibits filed with the SEC. You may
refer to the registration statement and its exhibits for more information.

      The SEC allows us to "incorporate by reference" into this prospectus the
information we file with the SEC. This means that we can disclose important
information to you by referring you to those documents. The information
incorporated by reference is considered to be part of this prospectus. If we
subsequently file updating or superseding information in a document that is
incorporated by reference into this prospectus, the subsequent information will
also become part of this prospectus and will supersede the earlier information.

      We are incorporating by reference the following documents that we have
filed with the SEC:

          .  our Transition Report on Form 10-K for the nine months ended
             December 31, 1998, and Items 7 and 8 of the Form 10-K for the
             fiscal year ended December 31, 1998 of Olympus Communications, L.P.
             and Olympus Capital Corporation;

          .  our Quarterly Report on Form 10-Q for the quarter ended March 31,
             1999;

                                       25
<PAGE>

          .  our Current Reports on Form 8-K for the events dated January 11,
             February 22, February 23, March 5, March 30, March 31, April 9,
             April 19, April 21, April 23, April 27, April 28, 1999 and May 26,
             1999;

          .  our definitive proxy statement dated September 11, 1998 with
             respect to the Annual Meeting of Stockholders held on October 6,
             1998; and

          .  the description of our Class A common stock contained in:

               .    our registration statement filed with the SEC under
                    Section12 of the Exchange Act and subsequent amendments and
                    reports filed to update such description; and

               .    our registration statement on Form S-3 (File No. 333-78027).

      We are also incorporating by reference into this prospectus:

          .  all of our future filings with the SEC under Sections 13(a), 13(c),
             14 or 15(d) of the Exchange Act until this offering has been
             completed; and

          .  all of our filings made by us under the Exchange Act after the date
             the registration statement to which this prospectus is a part was
             initially filed and prior to the effective date of that
             registration statement.

      You may obtain a copy of any of our filings which are incorporated by
reference, at no cost, by writing to or telephoning us at the following address:

                      Adelphia Communications Corporation
                      Main at Water Street
                      Coudersport, Pennsylvania  16915
                      Attention: Investor Relations
                      Telephone: (814) 274-9830

      You should rely only on the information provided in this prospectus or
incorporated by reference. We have not authorized anyone to provide you with
different information. You should not assume that the information in this
prospectus is accurate as of any date other than the date on the first page of
the prospectus. No offer of securities is being made in any state or country in
which the offer or sale is not permitted.

                                    EXPERTS

      The consolidated financial statements of Adelphia and its subsidiaries as
of March 31, 1998 and December 31, 1998, and for the years ended March 31, 1997
and 1998 and the nine months ended December 31, 1998, and the consolidated
financial statements of Olympus and its subsidiaries as of December 31, 1997 and
1998, and for each of the three years in the period ended December 31, 1998, all
incorporated in this prospectus by reference from Adelphia's Transition Report
on Form 10-K for the nine months ended December 31, 1998, have been audited by
Deloitte & Touche LLP, independent auditors, as stated in their reports, which
are

                                       26
<PAGE>

incorporated herein by reference, and have been so incorporated in reliance upon
the reports of such firm given upon their authority as experts in accounting and
auditing.

      The consolidated financial statements of FrontierVision Partners, L.P. and
subsidiaries as of December 31, 1998 and 1997, and for each of the years in the
three year period ended December 31, 1998, have been incorporated by reference
herein and in the registration statement from Adelphia's Current Report on Form
8-K filed April 19, 1999, in reliance upon the report of KPMG LLP, independent
certified public accountants, incorporated by reference herein, and upon the
authority of said firm as experts in accounting and auditing.

      The consolidated financial statements of Harron Communications Corp. and
subsidiaries as of December 31, 1998 and 1997 and for each of the three years in
the period ended December 31, 1998 incorporated in this prospectus by reference
from Adelphia's Current Report on Form 8-K filed April 19, 1999 have been
audited by Deloitte & Touche LLP, independent auditors, as stated in their
report, which is incorporated herein by reference, and has been so incorporated
in reliance upon the report of such firm given upon their authority as experts
in accounting and auditing.

      The consolidated financial statements of Century Communications Corp. and
subsidiaries as of May 31, 1998 and 1997 and for each of the three years in the
period ended May 31, 1998 incorporated in this prospectus by reference from
Adelphia's Current Report on Form 8-K filed on April 19, 1999 have been audited
by Deloitte & Touche LLP, independent auditors, as stated in their report, which
is incorporated herein by reference, and has been so incorporated in reliance
upon the report of such firm given upon their authority as experts in accounting
and auditing.

                                       27
<PAGE>

                      Adelphia Communications Corporation


                   7,000,000 Shares of Class A Common Stock






                                  PROSPECTUS


We have not authorized any dealer, salesperson or other person to give any
information or represent anything contained in this prospectus. You must not
rely on any unauthorized information. This prospectus does not offer to sell nor
does it solicit to buy any shares of Class A common stock in any jurisdiction
where it is unlawful. The information in this prospectus is current as of
_____________, 1999.
<PAGE>

                                    PART II

                    INFORMATION NOT REQUIRED IN PROSPECTUS


ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

      The following is an estimate of the expenses which will be incurred by
Adelphia in connection with the issuance and distribution of the securities
being registered.

<TABLE>
<CAPTION>
                                                                        AMOUNT
<S>                                                                 <C>
SEC filing fee....................................................  $    97,262
Legal fees and expenses...........................................       10,000
Accounting fees and expenses......................................        5,000
Miscellaneous expenses............................................        2,738
                                                                    -----------
Total.............................................................  $   115,000
                                                                    ===========
</TABLE>

ITEM 15.  INDEMNIFICATION OF DIRECTORS AND OFFICERS

      Section 145 of the Delaware General Corporation Law provides in general
that a corporation may indemnify its directors, officers, employees or agents
against expenditures (including judgments, fines, amounts paid in settlement and
attorneys' fees) made by them in connection with certain lawsuits to which they
may be made parties by reason of their being directors, officers, employees or
agents and shall so indemnify such persons against expenses (including
attorneys' fees) if they have been successful on the merits or otherwise. The
bylaws of Adelphia provide for indemnification of the officers and directors of
Adelphia to the full extent permissible under Delaware law.

      Adelphia's Certificate of Incorporation also provides, pursuant to Section
102(b)(7) of the Delaware General Corporation Law, that directors of Adelphia
shall not be personally liable to Adelphia or its stockholders for monetary
damages for breach of fiduciary duty as a director for acts or omissions after
July 1, 1986, provided that directors shall nonetheless be liable for breaches
of the duty of loyalty, bad faith, intentional misconduct, knowing violations of
law, unlawful distributions to stockholders, or transactions from which a
director derived an improper personal benefit.

                                     II-1
<PAGE>

ITEM 16.  EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(a)  The following is a complete list of Exhibits filed as part of this
Registration Statement, which are incorporated herein:

<TABLE>
<CAPTION>
Exhibit No.                  Reference
- -----------                  ---------
<S>               <C>                                                 <C>
4.01              Certificate of Incorporation of Adelphia            Incorporated herein by
                  Communications Corporation                          reference is Exhibit 3.01 to
                                                                      Registrant's Current Report on
                                                                      Form 8-K dated July 24, 1997
                                                                      (File No. 000-16104).

4.02              Certificate of Designations for 5 1/2% Series D     Incorporated herein by
                  Convertible Preferred Stock                         reference is Exhibit 3.01 to
                                                                      Registrant's Current Report on
                                                                      Form 8-K for the event dated
                                                                      April 28, 1999 (File No.
                                                                      000-16104).

23.01             Consent of Deloitte & Touche LLP with respect to    Filed herewith.
                  financial statements of Adelphia and Olympus

23.02             Consent of KPMG LLP with respect to financial       Filed herewith.
                  statements of FrontierVision

23.03             Consent of Deloitte & Touche LLP with respect to    Filed herewith.
                  financial statements of Century

23.04             Consent of Deloitte & Touche LLP with respect to    Filed herewith.
                  financial statements of Harron

24.01             Power of Attorney (included on the signature page   Filed herewith.
                  of the registration statement)
</TABLE>

ITEM 17.  UNDERTAKINGS

(a)     Rule 415 Offering.

     The undersigned Registrant hereby undertakes:

        (1)    To file, during any period in which offers or sales are being
made, a post-effective amendment to this Registration Statement:

               (i)  To include any prospectus required by section 10(a)(3) of
the Securities Act of 1933;

               (ii) To reflect in the prospectus any facts or events arising
after the effective date of the Registration Statement (or the most recent post-
effective amendment thereof) which,

                                     II-2
<PAGE>

individually or in the aggregate, represent a fundamental change in the
information set forth in the Registration Statement;

               (iii) To include any material information with respect to the
plan of distribution not previously disclosed in the Registration Statement or
any material change to such information in the Registration Statement;

Provided, however, that paragraphs (1)(i) and (1)(ii) above do not apply if the
Registration Statement is on Form S-3 or Form S-8, and the information required
to be included in a post-effective amendment by those paragraphs is contained in
periodic reports filed by the registrant pursuant to section 13 or section 15(d)
of the Securities Exchange Act of 1934 that are incorporated by reference in the
Registration Statement.

       (2)  That, for the purpose of determining any liability under the
Securities Act of 1933, each such post-effective amendment shall be deemed to be
a new registration statement relating to the securities offered therein, and the
offering of such securities at that time shall be deemed to be the initial bona
fide offering thereof.

       (3)  To remove from registration by means of a post-effective amendment
any of the securities being registered which remain unsold at the termination of
the offering.

(b)    Filings Incorporating Subsequent Exchange Act Documents by Reference.

     The undersigned Registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
Registrant's annual report pursuant to section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
Registration Statement shall be deemed to be a new registration statement
relating to the securities offered therein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

(c)    Request for Acceleration of Effective Date.

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

                                     II-3
<PAGE>

                                  SIGNATURES

      Pursuant to the requirements of the Securities Act of 1933, the Registrant
certifies that it has reasonable grounds to believe that it meets all of the
requirements for filing this registration statement on Form S-3 and has duly
caused this registration statement to be signed on its behalf by the
undersigned, thereunto duly authorized, in the City of Coudersport, Commonwealth
of Pennsylvania, on the 18th day of June, 1999.

                                   ADELPHIA COMMUNICATIONS
                                   CORPORATION


                                   By: /s/ Timothy J. Rigas
                                  ----------------------------------------------
                                   Timothy J. Rigas, Executive Vice President

                               POWER OF ATTORNEY

      KNOW ALL MEN BY THESE PRESENTS that each person whose signature appears
below constitutes and appoints Michael J. Rigas, Timothy J. Rigas and James P.
Rigas, and each of them, such person's true and lawful attorneys-in-fact and
agents, with full power of substitution and revocation, for such person and in
such person's name, place and stead, in any and all amendments (including post-
effective amendments to this registration statement) and to file the same with
all exhibits thereto, and other documents in connection therewith, with the
Securities and Exchange Commission, granting unto said attorneys-in-fact and
agents, and each of them, full power and authority to do and perform each and
every act and thing requisite and necessary to be done, as fully to all intents
and purposes as such person might or could do in person, hereby ratifying and
confirming all that said attorneys-in-fact and agents or any of them, or their
or his substitute or substitutes, may lawfully do or cause to be done by virtue
hereof.

      Pursuant to the requirements of the Securities Act, this Registration
Statement has been signed by the following persons in the capacities and on the
dates indicated.

<TABLE>
<CAPTION>
         SIGNATURES                                   TITLE                                       DATE
<S>                                <C>                                                         <C>
/s/ John J. Rigas                  Chairman, President and Chief Executive Officer             June 18, 1999
- -------------------------------
JOHN J. RIGAS

/s/ Michael J. Rigas               Executive Vice President and Director                       June 18, 1999
- -------------------------------
MICHAEL J. RIGAS

/s/ Timothy J. Rigas               Executive Vice President, Chief Financial                   June 18, 1999
- -------------------------------
TIMOTHY J. RIGAS                   Officer, Chief Accounting Officer, Treasurer
                                   and Director Executive Vice President
/s/ James P. Rigas                 and Director                                                June 18, 1999
- -------------------------------
JAMES P. RIGAS

/s/ Daniel R. Milliard             Senior Vice President, Secretary and Director               June 18, 1999
- -------------------------------
DANIEL R. MILLIARD
                                   Director                                                    June ___, 1999
_______________________________
PERRY S. PATTERSON
                                   Director                                                    June ___, 1999
_______________________________
PETE J. METROS
                                   Director                                                    June ___, 1999
_______________________________
DENNIS P. COYLE
</TABLE>

                                     II-4
<PAGE>

                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
Exhibit No.                     Reference
- -----------                     ---------
<S>               <C>                                                 <C>
4.01              Certificate of Incorporation of Adelphia            Incorporated herein by reference is
                  Communications Corporation                          Exhibit 3.01 to Registrant's
                                                                      Current Report on Form 8-K dated
                                                                      July 24, 1997 (File No. 000-16104).

4.02              Certificate of Designations for 5 1/2%              Incorporated herein by reference is
                  Series D Convertible Preferred Stock                Exhibit 3.01 to Registrant's
                                                                      Current Report on Form 8-K for the
                                                                      event dated April 28, 1999 (File
                                                                      No. 000-16104).

23.01             Consent of Deloitte & Touche LLP with               Filed herewith.
                  respect to financial  statements of
                  Adelphia and Olympus

23.02             Consent of KPMG LLP with respect to financial       Filed herewith.
                  statements of FrontierVision

23.03             Consent of Deloitte & Touche LLP with respect       Filed herewith.
                  to financial statements of Century

23.04             Consent of Deloitte & Touche LLP with respect       Filed herewith.
                  to financial statements of Harron

24.01             Power of Attorney (included on the signature        Filed herewith.
                  page to the registration statement)
</TABLE>

<PAGE>

                                                                   Exhibit 23.01


INDEPENDENT AUDITORS' CONSENT

We consent to the incorporation by reference in this Registration Statement of
Adelphia Communications Corporation on Form S-3 of our report dated May 17, 1999
and our report dated March 19, 1999 on our audits of the financial statements of
Adelphia Communications Corporation and subsidiaries and of Olympus
Communications, L.P. and subsidiaries, respectively, appearing in and
incorporated by reference in the Transition Report on Form 10-K of Adelphia
Communications Corporation for the nine months ended December 31, 1998 and to
the reference to us under the heading "Experts" in the prospectus, which is
part of this Registration Statement.



/s/ DELOITTE & TOUCHE LLP

Pittsburgh, Pennsylvania
June 18, 1999

<PAGE>

                                                                   Exhibit 23.02

CONSENT OF INDEPENDENT AUDITORS

We consent to the incorporation by reference in this Registration Statement on
Form S-3, of Adelphia Communications Corporation, of our report, dated March 19,
1999, relating to the consolidated balance sheets of FrontierVision Partners,
L.P. and subsidiaries as of December 31, 1998 and 1997, and the related
consolidated statements of operations, partners' deficit and cash flows for each
of the years in the three year period ended December 31, 1998, which report
appears in the April 19, 1999 Current Report on Form 8-K of Adelphia
Communications Corporation which is incorporated by reference herein and to the
reference to our firm under the heading "Experts" in the registration statement.



/s/ KPMG LLP

Denver, Colorado
June 18, 1999

<PAGE>

                                                                   Exhibit 23.03

INDEPENDENT AUDITORS' CONSENT

We consent to the incorporation by reference in this Registration Statement of
Adelphia Communications Corporation on Form S-3 of our report dated August 4,
1998, with respect to the consolidated balance sheets of Century Communications
Corp. and subsidiaries as of May 31, 1998 and 1997, and the related consolidated
statements of operations and cash flows for each of the three years in the
period ended May 31, 1998, included in the Current Report on Form 8-K, filed
April 19, 1999 by Adelphia Communications Corporation, incorporated by reference
in this Registration Statement and to the reference to us under the heading
"Experts" in the Prospectus, which is part of this Registration Statement.



/s/ DELOITTE & TOUCHE LLP

Stamford, Connecticut
June 18, 1999

<PAGE>

                                                                   Exhibit 23.04

INDEPENDENT AUDITORS' CONSENT

We consent to the incorporation by reference in this Registration Statement of
Adelphia Communications Corporation on Form S-3 of our report dated March 19,
1999 (April 12, 1999 as to Note 16), with respect to the consolidated balance
sheets of Harron Communications Corp. and subsidiaries as of December 31, 1998
and 1997, and the related consolidated statements of income, stockholders'
equity and comprehensive income and cash flows for each of the three years in
the period ended December 31, 1998, which report appears in Adelphia
Communications Corporation's Current Report on Form 8-K dated April 19, 1999. We
also consent to the reference to our firm under the heading "Experts" in the
prospectus, which is part of this Registration Statement.


/s/ DELOITTE & TOUCHE LLP

Philadelphia, Pennsylvania
June 18, 1999


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