Name:        Pear Tree Advisors, Inc.
Address:     55 Old Bedford Road
             Lincoln, MA  01773


Form 13F File Number:   28- 4108

The institutional investment manager filing this report and
the person by whom it is signed hereby represent that the
person signing the report is authorized to submit it, that
all information contained herein is true, correct and
complete, and that it is understood that all required items,
statements, schedules, lists, and tables, are considered
integral parts of this form.

Person Signing this Report on Behalf of Reporting Manager:

Name:           Willard L. Umphrey
Title:             President
Phone:          (781) 259-1144

Signature, Place, and Date of Signing:

/s/ Willard L. Umphrey,   Lincoln, MA            August 10, 2011
Willard L. Umphrey


Report Type (Check only one.):

[   ]    13F HOLDINGS REPORT.  (Check here if all holdings
     of this reporting manager are reported in this
     report.)

[    ]    13F NOTICE.  (Check here if no holdings reported
     are in this report, and all holdings are reported by
     another manager(s).)

[ X  ]    13F COMBINATION REPORT.  (Check here if a portion
     of the holdings for this reporting manager are
     reported in this report and a portion are reported by
     other reporting manager(s).)




List of Other Managers Reporting for this Manager:

        Form 13F File Number                 Name


        28-05386                        Columbia Partners, L.L.C.,
                                        Investment Management









                    Form 13F SUMMARY PAGE

Report Summary:

Number of Other Included Managers:                  0

Form 13F Information Table Entry Total:             21

Form 13F Information Table Value Total:           $ 33,670
                                                 (thousands)

List of Other Included Managers:

Provide a numbered list of the name(s) and Form 13F file
number(s) of all institutional investment managers with
respect to which this report is filed, other than the filing
manager of this report.

NONE




Form 13 F information Table

                  Title of                       Value           Shares/Sh/Put/     Invstmt       Other        Voting Authority
Name of Issuer     Class        CUSIP           (x$1000)         PRN AMT/PRN/Call    Dscretn       Mngrs        Sole/Shared/None

Baidu, Inc.	ADR		056752108	234			1668		SH		Other		Shared


Banco
Santender Chile     ADR     05965x109     786          8379     SH               OTHER               SHARED


China Gerui
Adv Mat          COM     G21101103     1199         313800     SH               OTHER               SHARED


China Yuchai	COM	G21082105	710	33652		SH		OTHER		SHARED

CIA Cervezeria	ADR	204429104	277	4713		SH		Other		Shared

CIA Saneamento	ADR	20441A102	547	9172		SH		OTHER		SHARED

Coca Cola
FEMSA          ADR     191241108     977          10501     SH               OTHER               SHARED


Compania
de Bebidas     ADR     20441W203     1973         58498    SH               OTHER               SHARED

Enersis          ADR     29274F104     975          42207     SH               OTHER               SHARED

Fomento
Economico Mex     ADR     344419106     2018          30354     SH               OTHER               SHARED

Gerdau		ADR	373737105	116		11062	SH		OTHER			SHARED

Gold Fields     ADR     38059T106     1099          75297     SH               OTHER               SHARED


Infosys
Technologies     ADR     456788108     3183          48800     SH               OTHER               SHARED

LAN Air          ADR     501723100     767          26892     SH               OTHER               SHARED

Lihua Intl     COM     532352101     1102          181000     SH               OTHER               SHARED



METHANEX
CORP                 COM       59151K108     5360           170817  SH        OTHER             SHARED


PETROLEO
BRASILEIRO SA
PETRO              ADR    71654V101     2142       69819     SH         OTHER                             SHARED

Tele Norte	ADR	879246106	934	60130	SH		OTHER			SHARED

Teva Pharm	ADR	881624209	8607	178491	SH		OTHER			SHARED


TIM Part	ADR	88706P106	302	6127	SH		OTHER			SHARED

Vanguard MSCI	ADR	922042858	362	7446	SH		Other			SHARED