Most of the exchange-listed tickers are the same in the old and the new SIP data, but there were big changes in the over-the-counter tickers, with fewer penny stocks and more ADRs. There are a few more exchange-listed foreign stocks in the new data. Most of the dropped exchange-listed tickers were miscellaneous finance companies (acquisition companies or investment funds).
Details are below.

I compared the number of tickers with the old SIP data (September 27th) and the new SIP data (October 1st). tickersMatch is the number of S1001 tickers that are in the S0927 data. Most of the exchange listed tickers were in both the old data and the new data. Most of the OTC tickers changed with the new data.

  field         value       S0927  S1001  tickersMatch  ratio
Exchange      not OTC       5360   5291       5073       96%
Exchange  Over the counter  1342   1408       210        15%

With the new data, OTC tickers had about 800 fewer US penny stocks and 800 more ADRs.

field  value  S0927  S1001      Exchange
 ADR     F    4988   4891       not OTC
 ADR     T     372    400       not OTC
 
 ADR     F    1149    356   Over the counter
 ADR     T     193   1052   Over the counter

There were also a few changes in exchange-listed tickers, with 218 new tickers. Most of these (125 out of 218) were ADRs or had HQ outside the US.

218 new tickers.
159 of these had a unique company name (59 were multiple share classes like BRK.A and BRK.B).
121 of these were not ADRs (38 were ADRs).
34 of these have HQ in the US (87 had HQ outside the US).
25 these tickers did not include a period. (9 had a period. For example, FCNCA changed to FCNC.A)


There were 287 tickers in the old data but not in the new data. Most of these (142 out of 287) were Investment Holding or Investment Management companies (e.g. acquisition companies like AACT and VACHU. Or investment funds like BXSL, GBDC, and OBDC.)

287 dropped tickers.
275 had a unique company name (12 were multiple share classes like GIB and GIB.A).
263 of these were not ADRs (12 were ADRs).
183 of these have HQ in the US (80 had HQ outside the US).
164 of these were not in the new data after adding a period. (19 had a match with a period. For example, QRTEA changed to QRTE.A)
54 of these are not Investment Holding Companies. (110 were industry 55601010 - Investment Holding Companies.)
22 of these are not Investment Management & Fund Operators (32 were industry 55102020 - Investment Management & Fund Operators.)

The new data lists more tickers from companies with multiple share classes (e.g. BF.A and BF.B). The new data has 53 companies with multiple tickers (47 exchange-listed companies), while there were 11 in the old data. The company name is the same, and the trade volumes are different. The new SIP data:

Ticker       SP         Price    volume10dAvg  volume3mAvg  dollarVolume3mAvg  Name                                      Total assets Q1  Market Cap Q1
 GOOG       500         168.42      19,294       375,764        3,164,311      Alphabet Inc.                                 414,770        2,063,634
GOOGL       500         166.99      24,699       534,588        4,463,545      Alphabet Inc.                                 414,770        2,063,634
BATR.A      None        41.78         63           704            1,471        Atlanta Braves Holdings, Inc.                  1,574           2,484
BATR.K      None        39.49        435          5,600           11,057       Atlanta Braves Holdings, Inc.                  1,574           2,484
BELF.A      None        102.50        17           307            1,572        Bel Fuse Inc.                                   568            1,057
BELF.B      None        80.50         98          1,471           5,920        Bel Fuse Inc.                                   568            1,057
BRK.A       None      685000.00        2           38           1,298,178      Berkshire Hathaway Inc.                      1,108,860        985,122
BRK.B       500         457.41       3,735       83,190         1,902,601      Berkshire Hathaway Inc.                      1,108,860        985,122
  BH        None        170.08         3           42              359         Biglari Holdings Inc.                           809             527
 BH.A       None        844.50         0            3              118         Biglari Holdings Inc.                           809             527
  BIO    MidCap 400     337.69       772          6,595          111,348       Bio-Rad Laboratories, Inc.                     9,688           9,356
BIO.B       None        326.74         1           13              208         Bio-Rad Laboratories, Inc.                     9,688           9,356
 BF.A       None        47.70        260          2,019           4,815        Brown-Forman Corporation                       8,205           22,862
 BF.B       500         48.74        3,831       43,281          105,476       Brown-Forman Corporation                       8,205           22,862
  CCL       500         18.02       36,524       571,018         514,487       Carnival Corporation & plc                    49,805           23,193
  CUK       None        16.29        2,407       40,787           33,221       Carnival Corporation & plc                    49,805           23,193
 CENT   SmallCap 600    35.65        181          2,471           4,405        Central Garden & Pet Company                   3,608           2,143
CENT.A  SmallCap 600    30.88        477          6,642           10,255       Central Garden & Pet Company                   3,608           2,143
 CWEN   SmallCap 600    30.74        770         15,547           23,896       Clearway Energy, Inc.                         14,517           3,534
CWEN.A  SmallCap 600    28.53        224          3,829           5,463        Clearway Energy, Inc.                         14,517           3,534
CRD.A       None        11.38        103          1,634            930         Crawford & Company                              786             561
CRD.B       None        11.44         20           402             230         Crawford & Company                              786             561
DGIC.A      None        14.74         73          1,146            845         Donegal Group Inc.                             2,335            483
DGIC.B      None        12.77          4           49               31         Donegal Group Inc.                             2,335            483
AKO.A       None        14.48          3           46               33         Embotelladora Andina S.A.                      3,182           2,721
AKO.B       None        19.45         12           236             230         Embotelladora Andina S.A.                      3,182           2,721
  FAT       None        4.73          23           500             118         FAT Brands Inc.                                1,356             81
FATB.B      None        4.85           2           38               9          FAT Brands Inc.                                1,356             81
  AGM       None        183.28        46           990            9,068        Federal Agricultural Mortgage Corporatio      30,194           1,953
AGM.A       None        143.26         1           32              226         Federal Agricultural Mortgage Corporatio      30,194           1,953
FWON.A      None        70.37        169          2,440           8,585        Formula One Group                             10,810           17,836
FWON.K      None        76.13        1,081       24,169           91,999       Formula One Group                             10,810           17,836
  FOX       500         39.00        1,206       19,231           37,501       Fox Corporation                               21,972           18,608
 FOXA       500         42.32        4,594       58,956          124,751       Fox Corporation                               21,972           18,608
  GTN       None        5.39         1,339       32,303           8,706        Gray Television, Inc.                         10,634            528
GTN.A       None        7.36           8           71               26         Gray Television, Inc.                         10,634            528
  GEF    MidCap 400     62.03        144          3,235           10,032       Greif, Inc.                                    6,835           3,076
GEF.B       None        69.02         15           192             662         Greif, Inc.                                    6,835           3,076
  HVT       None        27.03        812          6,079           8,216        Haverty Furniture Companies, Inc.               642             443
HVT.A       None        26.95          1           12               16         Haverty Furniture Companies, Inc.               642             443
  HEI       None        262.28       359          7,988          104,757       HEICO Corporation                              7,422           31,469
HEI.A       None        203.99       189          3,835           39,115       HEICO Corporation                              7,422           31,469
  WLY   SmallCap 600    48.67        461          7,089           17,251       John Wiley & Sons, Inc.                        2,652           2,640
 WLYB       None        48.45          0           10               24         John Wiley & Sons, Inc.                        2,652           2,640
KELY.A  SmallCap 600    21.30        292          4,558           4,855        Kelly Services, Inc.                           2,628            757
KELY.B      None        21.00          0           11               12         Kelly Services, Inc.                           2,628            757
  LEN       500         188.30       2,370       42,637          401,432       Lennar Corporation                            39,741           51,226
LEN.B       None        173.65        43           901            7,822        Lennar Corporation                            39,741           51,226
LBRD.A      None        78.52        354          3,249           12,756       Liberty Broadband Corporation                 15,959           11,285
LBRD.K      None        79.08        2,032       20,702           81,856       Liberty Broadband Corporation                 15,959           11,285
LBTY.A      None        21.23        1,894       33,827           35,907       Liberty Global Ltd.                           40,838           7,864
LBTY.B      None        20.90          3           54               56         Liberty Global Ltd.                           40,838           7,864
LBTY.K      None        21.84        1,426       28,325           30,931       Liberty Global Ltd.                           40,838           7,864
 LILA       None        9.70         336          6,005           2,912        Liberty Latin America Ltd.                    13,151           1,883
LILA.K      None        9.59         735         19,865           9,525        Liberty Latin America Ltd.                    13,151           1,883
LLYV.A      None        50.02        235          2,398           5,996        Liberty Live Group                             1,000           4,691
LLYV.K      None        51.57        525          5,436           14,018       Liberty Live Group                             1,000           4,691
LGF.A       None        7.68         814         22,556           8,661        Lions Gate Entertainment Corp.                 7,222           1,704
LGF.B       None        6.79         905         19,927           6,765        Lions Gate Entertainment Corp.                 7,222           1,704
  MKC       500         84.09        2,337       38,176          160,512       McCormick & Company, Incorporated             13,205           22,594
MKC.V       None        84.37          3           46              195         McCormick & Company, Incorporated             13,205           22,594
  TAP       500         57.35        2,390       41,588          119,254       Molson Coors Beverage Company                 27,394           11,884
TAP.A       None        58.26          1           16               47         Molson Coors Beverage Company                 27,394           11,884
MOG.A   SmallCap 600    201.22       144          2,858           28,752       Moog Inc.                                      4,068           6,428
MOG.B       None        198.23         0           11              108         Moog Inc.                                      4,068           6,428
  NWS       500         27.77        759         14,372           19,955       News Corporation                              16,684           15,292
 NWSA       500         26.41        2,571       54,765           72,318       News Corporation                              16,684           15,292
 PARA       500         10.60        8,580       229,445         121,606       Paramount Global                              45,890           7,527
PARA.A      None        21.90         69          1,543           1,690        Paramount Global                              45,890           7,527
 PSNY       None        1.74         6,817       240,035          20,883       Polestar Automotive Holding UK PLC             3,832           3,672
PSNY.W      None        0.30         244         31,675            474         Polestar Automotive Holding UK PLC             3,832           3,672
  PCT       None        8.81         3,046       49,499           21,804       PureCycle Technologies, Inc.                    720            1,453
PCTT.U      None        11.01          1           15               8          PureCycle Technologies, Inc.                    720            1,453
QRTE.A      None        0.60         3,644       55,760           1,673        Qurate Retail, Inc.                           10,939            269
QRTE.B      None        4.03           3           78               16         Qurate Retail, Inc.                           10,939            269
 METC       None        11.97        667         11,226           6,719        Ramaco Resources, Inc.                          659             616
METC.B      None        10.66         30           446             238         Ramaco Resources, Inc.                          659             616
  RDI       None        1.63          14           371              30         Reading International, Inc.                     495              48
 RDIB       None        8.22          11           252             104         Reading International, Inc.                     495              48
RUSH.A  SmallCap 600    51.90        512          7,650           19,853       Rush Enterprises, Inc.                         4,507           4,010
RUSH.B      None        47.25         21           367             868         Rush Enterprises, Inc.                         4,507           4,010
  SEG       None        26.99        191          2,592           3,498        Seaport Entertainment Group Inc.                610             149
SEG.RT      None        2.59         124           332              43         Seaport Entertainment Group Inc.                610             149
SENE.A      None        61.99         39           568            1,760        Seneca Foods Corporation                       1,369            428
SENE.B      None        61.10          3           27               83         Seneca Foods Corporation                       1,369            428
 UHAL       None        78.09        120          1,730           6,754        U-Haul Holding Company                        19,305           14,219
UHAL.B      None        71.90        196          3,496           12,568       U-Haul Holding Company                        19,305           14,219
  UA     MidCap 400     8.36         5,266       69,928           29,230       Under Armour, Inc.                             4,861           3,724
  UAA    MidCap 400     8.86        14,730       294,680         130,543       Under Armour, Inc.                             4,861           3,724
 UONE       None        1.64          39          1,178             97         Urban One, Inc.                                1,020             58
UONE.K      None        1.10          30           529              29         Urban One, Inc.                                1,020             58
  WSO    MidCap 400     495.70       251          5,057          125,327       Watsco, Inc.                                   4,395           18,636
WSO.B       None        495.00         1           11              263         Watsco, Inc.                                   4,395           18,636
  Z         None        64.65        3,639       77,707          251,189       Zillow Group, Inc.                             6,628           14,846
  ZG        None        62.71        656         13,155           41,248       Zillow Group, Inc.                             6,628           14,846

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