Pursuant to Rule 425 under the  Securities
                                      Act of 1933  and deemed  filed pursuant to
                                      Rule 14a-12 under the Securities  Exchange
                                      Act of 1934.


                      NBT Bancorp Inc. & BSB Bancorp, Inc.

                                Merger of Equals

                              Investor Presentation

                                  May 17, 2000


FORWARD-LOOKING STATEMENT

This  presentation  contains  statements  regarding  NBT  Bancorp  Inc.  and BSB
Bancorp, Inc. following the completion of the merger of equals discussed herein,
including strategies,  plans and objectives, as well as estimates and statements
based on underlying  estimates of future  financial  condition,  performance and
operating  efficiencies  on a pro  forma  basis  and cost  savings  and  revenue
enhancements  and accretion to reported  earnings that will be realized from the
merger.

These statements and estimates constitute forward-looking statements (within the
meaning of the Private Securities  Litigation Reform Act of 1995), which involve
significant  risks and  uncertainties.  A variety of factors  could cause actual
results and experience to differ materially from forward-looking statements.

Factors  that might  cause such a  difference  include,  but are not limited to,
risks and uncertainties related to the consummation of the merger, including the
realization of the level of revenues following the merger;  integration costs or
difficulties;  competition from both financial and  non-financial  institutions;
changes in interest rates, deposit flows, loan demand and accounting principles,
policies  or  guidelines;  the  timing and  occurrence  (or  non-occurrence)  of
transactions and events that may be subject to circumstances  beyond the control
of NBT or BSB; and other  economic,  competitive,  governmental,  regulatory and
technological   factors  affecting  NBT  or  BSB  or  the  combined  institution
specifically or the banking industry or economy generally.

Neither  NBT or BSB  assumes  any  obligation  to update  these  forward-looking
statements  or to update the reasons why actual  results could differ from those
projected in the forward-looking statement.

This  presentation  may be deemed to be solicitation  material in respect of the
proposed  merger of BSB Bancorp,  Inc.  ("BSB")  with NBT Bancorp  Inc.  ("NBT")
pursuant to an Agreement  and Plan of Merger,  dated as of April 19,  2000,  and
amended as of May 17, 2000, by and between NBT and BSB (the "Agreement"). Filing
of this  presentation  is being made in connection  with Regulation of Takeovers
and Security Holder Communications  (Release No. 33-7760,  34-42055) promulgated
by the Securities and Exchange Commission ("SEC").



NBT and its directors and executive officers may be deemed to be participants in
the solicitation of proxies in respect of the  transactions  contemplated by the
Agreement.  These directors and executive officers include the following:  Daryl
R.  Forsythe,  Michael J. Chewens,  Martin A.  Dietrich,  Joe C. Minor,  John D.
Roberts,  Everett A. Gilmour,  J. Peter  Chaplin,  Peter B. Gregory,  William C.
Gumble,  Bruce D. Howe,  Andrew S.  Kowalczyk,  Jr.,  Dan B.  Marshman,  John G.
Martines,  John C. Mitchell,  William L. Owens and Paul O. Stillman. As of March
31, 2000,  these  directors and  executive  officers  beneficially  owned in the
aggregate 1,417,878 shares, or approximately  7.83%, of NBT's outstanding common
stock.  Additional information about the directors and executive officers of NBT
is included in NBT's proxy statement for its 2000 Annual Meeting of shareholders
dated April 3, 2000.

BSB and certain other persons  named below may be deemed to be  participants  in
the solicitation of proxies of BSB's shareholders to approve the proposed merger
transaction  between BSB and NBT.  The  participants  in this  solicitation  may
include the directors of BSB: Ferris G. Akel,  Robert W. Allen,  Diana J. Bendz,
William C. Craine,  John P. Driscoll,  Ann G. Higbee,  Thomas F. Kelly, David A.
Niermeyer,  Mark T. O'Neil, Jr., William H. Rincker and Thomas L. Thorn; as well
as the executive  officers of BSB:  Glenn R. Small,  Executive  Vice  President;
Arthur C.  Smith,  Executive  Vice  President;  Rexford C.  Decker,  Senior Vice
President and Chief Financial Officer; Larry G. Denniston, Senior Vice President
and Corporate Secretary;  Douglas R. Johnson, Senior Vice President; and Matthew
W. Schaefer, Executive Vice President and Chief Information Officer. As of March
31, 2000, the directors and executive  officers of BSB beneficially owned in the
aggregate  approximately  1,039,463  shares of BSB's  outstanding  common stock,
representing  approximately 9.90% of BSB's outstanding common stock.  Additional
information  about the directors  and  executive  officers of BSB is included in
BSB's proxy statement for its 2000 Annual Meeting of shareholders filed with the
SEC on April 3, 2000.

In  connection  with  the  proposed  merger,  NBT  will  file  with  the  SEC  a
registration  statement on SEC Form S-4. The registration statement will contain
a joint proxy  statement/prospectus,  which will describe the proposed merger of
NBT and BSB and the proposed terms and conditions of the merger. Stockholders of
NBT and BSB are  encouraged to read the  registration  statement and joint proxy
statement/prospectus  because these documents will contain important information
about the merger.  After the  registration  statement  is filed with the SEC, it
will be  available  for free,  both on the SEC's  web site  (www.sec.gov)  or by
contacting  NBT Bancorp Inc., 52 South Broad  Street,  Norwich,  New York 13815,
Attention:  John D. Roberts,  telephone  (607) 337-6541;  or BSB Bancorp,  Inc.,
58-68  Exchange  Street,   Binghamton,  New  York  13901,  Attention:  Larry  G.
Denniston, telephone (607) 779-2406.




                                                                               2


PRESENTERS


Daryl R. Forsythe - Chairman, President and CEO of NBT Bancorp Inc.

Thomas L. Thorn - Acting President and CEO of BSB Bancorp, Inc.

Michael J. Chewens - CFO of NBT Bancorp Inc.

Rexford C. Decker - CFO of BSB Bancorp, Inc.


                                                                               3


TRANSACTION SUMMARY

                                         
Fixed Exchange Ratio:                       2.00 NBTB shares for each share of BSBN
Exchange Rationale:                         Ownership for Earnings Basis
Transaction Value at Announcement: (1)      $251 million
Accounting:                                 Pooling / Tax Free Exchange
Due Diligence:                              Completed
Anticipated Expense Reduction:              $7.4 million annually
Expected Closing:                           Fourth Quarter of 2000
(1) Based on NBT's April 19, 2000 closing price of $12.00 4 TRANSACTION SUMMARY (CONTINUED) Holding Company Name: To Be Determined Bank Name: To Be Determined Principal Office: Binghamton, NY Board of Directors:(1) 7 from BSB and 8 from NBT including 2 from the company's Pennsylvania subsidiary Chairman & CEO: Daryl R. Forsythe Estimated Merger Charge: $15 to 18 million pre-tax Cross-Options: 19.9% priced at market Price Protection: None
(1) Provided NBT's pending transaction with Pioneer American closes. 5 TRANSACTION RATIONALE o Exchange ratio was based upon estimated contributions to earnings in future periods by the two participants (excluding non-recurring charges) o Expected to be accretive to earnings per share for all participants during 2001 o Improves shareholder liquidity with projected total shares outstanding of 44.9 million o Creates a more visible entity with pro forma assets of $4.6 billion which should attract increased analyst coverage and increased interest of institutional investors o Leverages strong competitive positions in adjacent markets 6 COST SAVING ANALYSIS Non Interest Expense (In Millions) - -------------------- ------------- Salary & Benefits $2.9 Occupancy Expense 0.3 Professional Fees / Outside Svcs. 2.8 IS and Communications 0.2 Other Operating Expenses 1.2 ---- Total $7.4 Note: Full phase in expected in 2001. 7 EPS ANALYSIS OF COST SAVES Estimated cost saves of $7.4 million will generate approximately $0.10 per share (1) accretion once the cost saves have been fully implemented in 2001. (1) Utilizes 44.9 million shares and an effective tax rate of 38%. 8 PRO FORMA BALANCE SHEET (IN THOUSANDS) DATA AS OF MARCH 31, 2000
PRO FORMA NBT (1) BSB COMBINED ------- --- -------- Total Assets 2,444,834 2,230,864 4,675,698 Securities 723,115 395,782 1,118,897 Loans 1,540,798 1,745,959 3,286,757 Total Deposits 1,823,623 1,899,278 3,722,901 Total Equity 194,625 157,016 351,641 Shares Outstanding 44.9 million
(1) Includes pending acquisition of Pioneer American Holding Company. 9 FINANCIAL RATIOS BASED ON ANNUALIZED FIRST QUARTER 2000 RESULTS
Pro forma With NBT BSB Combined Cost Saves --- --- -------- ---------- ROAA* 1.07 1.18 1.13 1.24 ROAE* 13.27 17.04 15.07 16.52 NIM 4.32 4.22 4.27 4.27 Eff. Ratio 56.62 41.63 48.86 46.64
* NBT's and BSB's net income has been normalized by adding back non-recurring expenses of $1,122,000 for NBT and $855,000 for BSB. 10 Overview of Combined Market Area o 102 total branches serving 19 counties in 2 states o Commanding market presence in eight counties as measured by a deposit share rank of 1, 2, or 3 o Leading deposit share in Binghamton and Norwich o Growing presence in the Syracuse and Scranton markets 11 [MAP OMITTED] 12 DEPOSIT SHARE AND RANK BY COUNTY COUNTY, STATE DEPOSIT SHARE RANK ------------- ------------- ---- Broome, NY 56.5% 1 Chemung, NY 5.1% 6 Chenango, NY 84.4% 1 Clinton, NY 9.8% 4 Delaware, NY 33.9% 1 Essex, NY 25.0% 2 Fulton, NY 11.1% 4 Montgomery, NY 2.0% 6 Oneida, NY 5.3% 6 Onondaga, NY 4.7% 7 Otsego, NY 1.6% 7 Oswego, NY 0.4% 11 Tioga, NY 21.2% 2 Lackawanna, PA 11.5% 3 Luzerne, PA 0.9% 16 Monroe, PA 3.2% 6 Pike, PA 18.6% 3 Wayne, PA 17.9% 3 Wyoming, PA 0.6% 6 13 SUMMARY OF ONE TIME EXPENSES Charges (In Millions) - ------- ------------- Professional Fees $7 to 8 Severance 3 Data Processing 3 to 5 Other 2 ------------- Total $15 to $18 14 REASONS TO INVEST IN THE NEW COMPANY o Expected to be accretive to EPS in first full year o Similar corporate cultures that will be easily integrated o Increased operating efficiencies o Building on each other's strength through cross selling opportunities 15 NBTB and BSBN vs. NASDAQ Bank Index (Jan 98 to Present) [GRAPH OMITTED] 16 NBTB BSBN NASDAQ Bank Index 1/2/1998 100% 100% 100% 1/9/1998 88% 88% 92% 1/16/1998 97% 89% 95% 1/23/1998 94% 85% 94% 1/30/1998 96% 86% 96% 2/6/1998 95% 84% 99% 2/13/1998 97% 88% 100% 2/20/1998 94% 86% 100% 2/27/1998 96% 87% 102% 3/6/1998 97% 87% 103% 3/13/1998 97% 90% 104% 3/20/1998 99% 87% 107% 3/27/1998 100% 91% 108% 4/3/1998 102% 91% 108% 4/10/1998 104% 91% 107% 4/17/1998 117% 94% 109% 4/24/1998 124% 95% 110% 5/1/1998 124% 92% 109% 5/8/1998 118% 89% 107% 5/15/1998 115% 87% 108% 5/22/1998 115% 87% 108% 5/29/1998 120% 88% 105% 6/5/1998 118% 91% 105% 6/12/1998 118% 87% 101% 6/19/1998 116% 83% 100% 6/26/1998 116% 88% 101% 7/3/1998 125% 87% 103% 7/10/1998 116% 86% 104% 7/17/1998 116% 86% 103% 7/24/1998 117% 90% 102% 7/31/1998 113% 91% 97% 8/7/1998 112% 85% 94% 8/14/1998 115% 77% 91% 8/21/1998 122% 78% 89% 8/28/1998 115% 76% 81% 9/4/1998 114% 80% 79% 9/11/1998 103% 82% 81% 9/18/1998 110% 78% 84% 9/25/1998 110% 78% 84% 10/2/1998 112% 79% 81% 10/9/1998 108% 73% 75% 17 10/16/1998 107% 71% 83% 10/23/1998 108% 77% 83% 10/30/1998 110% 78% 86% 11/6/1998 122% 84% 90% 11/13/1998 121% 80% 87% 11/20/1998 121% 82% 89% 11/27/1998 127% 81% 91% 12/4/1998 129% 81% 87% 12/11/1998 127% 82% 85% 12/18/1998 123% 83% 86% 12/25/1998 126% 92% 86% 1/1/1999 119% 92% 88% 1/8/1999 122% 84% 89% 1/15/1999 113% 81% 87% 1/22/1999 108% 80% 85% 1/29/1999 115% 75% 86% 2/5/1999 112% 75% 84% 2/12/1999 112% 73% 84% 2/19/1999 115% 73% 85% 2/26/1999 114% 75% 85% 3/5/1999 113% 73% 87% 3/12/1999 113% 75% 88% 3/19/1999 113% 73% 87% 3/26/1999 113% 71% 85% 4/2/1999 104% 68% 84% 4/9/1999 109% 70% 85% 4/16/1999 112% 75% 88% 4/23/1999 108% 73% 89% 4/30/1999 109% 72% 90% 5/7/1999 111% 74% 90% 5/14/1999 108% 69% 89% 5/21/1999 108% 71% 89% 5/28/1999 107% 71% 89% 6/4/1999 109% 71% 88% 6/11/1999 108% 75% 87% 6/18/1999 107% 77% 88% 6/25/1999 104% 74% 88% 7/2/1999 106% 75% 90% 7/9/1999 102% 75% 90% 7/16/1999 102% 76% 90% 7/23/1999 104% 76% 89% 7/30/1999 105% 76% 87% 18 8/6/1999 102% 76% 85% 8/13/1999 103% 73% 86% 8/20/1999 98% 73% 86% 8/27/1999 96% 70% 85% 9/3/1999 95% 71% 84% 9/10/1999 98% 72% 83% 9/17/1999 97% 70% 81% 9/24/1999 92% 70% 80% 10/1/1999 89% 67% 81% 10/8/1999 93% 68% 84% 10/15/1999 94% 68% 80% 10/22/1999 92% 64% 83% 10/29/1999 95% 62% 87% 11/5/1999 95% 62% 88% 11/12/1999 93% 65% 88% 11/19/1999 94% 62% 88% 11/26/1999 93% 58% 85% 12/3/1999 90% 59% 86% 12/10/1999 83% 56% 81% 12/17/1999 82% 53% 79% 12/24/1999 88% 53% 81% 12/31/1999 83% 54% 81% 1/7/2000 84% 59% 77% 1/14/2000 79% 57% 77% 1/21/2000 78% 55% 74% 1/28/2000 74% 55% 74% 2/4/2000 74% 55% 75% 2/11/2000 74% 52% 73% 2/18/2000 71% 53% 71% 2/25/2000 65% 49% 69% 3/3/2000 75% 48% 68% 3/10/2000 74% 48% 65% 3/17/2000 82% 50% 72% 3/24/2000 76% 58% 73% 3/31/2000 78% 58% 74% 4/7/2000 74% 54% 73% 4/14/2000 61% 50% 70% 4/21/2000 55% 56% 72% 4/28/2000 56% 55% 72% 5/5/2000 57% 55% 71% 5/12/2000 55% 54% 73% 19