SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                    FORM 8-K

                                 CURRENT REPORT
                     Pursuant to Section 13 or 15(d) of the
                         Securities Exchange Act of 1934

                          Date of Report: June 21, 1996

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


                                SIS BANCORP, INC.
               (exact name of registrant as specified in charter)


Massachusetts                     000-20809                 04-3303264
State or Other Jurisdiction       Commission                (IRS Employer
of Incorporation)                 File Number)              Identification No.)


1441 Main Street                                            01102
Springfield, Massachusetts                                  (Zip Code)
(address of principal office)


                                 (413) 748-8000
              (Registrant's telephone number, including area code)









                                       -2-

Item 2.  Acquisition or Disposition of Assets.

         On June 21, 1996, SIS Bancorp,  Inc., a Massachusetts  corporation (the
"Company"),  which was  organized by  Springfield  Institution  for  Savings,  a
Massachusetts  stock savings bank (the "Bank"),  for the purpose of reorganizing
the Bank into a holding  company  structure,  acquired  100% of the  outstanding
shares of the Bank's common stock,  par value $1.00 per share, in a 1:1 exchange
for shares of the Company's common stock, par value $.01 per share (the "Company
Common Stock").  Upon the  effectiveness of such  share-for-share  exchange (the
"Reorganization"),  the Bank became the  wholly-owned  subsidiary of the Company
and the Bank's former stockholders  became the stockholders of the Company.  The
Reorganization  was  consummated  in  accordance  with the  terms  of a  certain
Agreement  and Plan of  Reorganization  dated as of January 31, 1996 between the
Bank and the Company.  The Company  Common Stock is included in the NASDAQ Stock
Exchange under the symbol "SISB".

Item 7.  Financial Statements, Pro Forma Financial Information, and Exhibits.

         (a)      Financial Statements

                  The financial statements contained in the Bank's Annual Report
                  on Form F-2 for the year ended December 31, 1995 and Quarterly
                  Report on Form F-4 for the three  months ended March 31, 1996,
                  as  previously  filed by the Bank  with  the  Federal  Deposit
                  Insurance Corporation under Section 13 of the Exchange Act and
                  included  as  Exhibits  99.3 and  99.6,  respectively,  to the
                  Company's Registration Statement on Form 8-A, are incorporated
                  herein and made a part hereof by this reference.

         (b)      Pro Forma Financial Information

                  The following  unaudited pro forma  financial  information has
                  been prepared to reflect the June 21, 1996  acquisition of the
                  Bank by the Company using pooling of interests  accounting and
                  as if it had been  consummated  as of March 31,  1996.  As the
                  Company  had  no  material  assets  or  operations   prior  to
                  consummation  of the  Reorganization  described in Item 2, the
                  pro forma  information  demonstrating  the balance sheet as of
                  March 31, 1996 and income  statements  as of December 31, 1995
                  and March 31, 1996 of the Company as if the Reorganization had
                  occurred as of January 1, 1996 are  substantially  the same as
                  those  of the  Bank  described  in Item  7(a)  above  with the
                  exception  of the  following  pro forma  adjustments.  The pro
                  forma adjustments  result from (i) the one for one exchange of
                  shares of the Company Common Stock, $0.01 par value per share,
                  for  shares of the common  stock of the Bank,  $1.00 par value
                  per  share,  and  (ii) the  repurchase  of 100  shares  of the
                  Company  Common Stock from the Bank at par value.  As of March
                  31, 1996,  there were 5,718,200  shares of common stock of the
                  Bank  outstanding;  and  as  of  June  21,  1996,  there  were
                  5,722,600 shares of common stock of the Bank outstanding.  The
                  following  shows the impact of these pro forma  adjustments to
                  the stockholders' equity of the Company at March 31, 1996:






                                       -3-





                                       Bank
                                    Historical                 Company
                                    Financial                Historical              Pro Forma             Pro Forma
                                   Information          Financial Information       Adjustments          Consolidated
- ----------------------------- ----------------------  -------------------------  -----------------  -----------------------
                                                                                                   
Stockholders' Equity

Common Stock                          $ 5,718                   $     --              ($5,661)                    $ 57

Unearned
    Compensation                      $(4,649)                        --                   --                   (4,649)

Additional Paid-In
    Capital                           $36,197                        250                5,661                   42,108

Retained Earnings                     $45,586                         --                 (250)                  45,236

Unrealized Gain/Loss
on Investment Securities
Available for Sale                     $1,485                         --                   --                    1,485
___________________________________________________________________________________________________________________________

Total:                                $84,237                      $ 250                $(250)                 $84,237


There are no other pro forma adjustments as a result of the Reorganization  that
would result in differences  between the pro forma  financial  statements of the
Company and the consolidated  financial statements of the Bank described in Item
7(a) above.

         (c)      Exhibits

                  (2)      Agreement  and  Plan of  Reorganization  dated  as of
                           January  31,  1996  between the Company and the Bank,
                           incorporated  herein by reference  from Appendix A to
                           the Proxy  Statement-Prospectus  included  as Exhibit
                           99.5 to the Company's  Registration Statement on Form
                           8-A.





                                       -4-

                                   Signatures

         Under the  requirements  of the  Securities  Exchange Act of 1934,  the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned, hereunto duly authorized.

                              SIS BANCORP, INC.

                              Date:  June 21, 1996



                              By: /s/ F. William Marshall, Jr.
                                      F. William Marshall, Jr.
                                      President and Chief Executive Officer