UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                    Form 13F

                              FORM 13F COVER PAGE

Report for the Calendar Year or Quarter Ended:  31 MARCH 2013

Check here if Amendment   [ ];   Amendment Number:

This Amendment (Check only one.):      [  ] is a restatement.
                                       [  ] adds new holdings entries.

Institutional Investment Manager Filing this Report:

Name:      ALTA ADVISERS LIMITED
Address:   8 LANCELOT PLACE
           LONDON SW7 1DR
           ENGLAND

Form 13F File Number:    28-14709

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:     PAUL MANSER

Title:    GENERAL COUNSEL

Phone:    020 7590 5010

Signature, Place, and Date of Signing:

/s/ Paul Manser               London, England         05/13/13
---------------------------                  --------------------
   [Signature]               [City, State]           [Date]

Report Type (Check only one.):

[X]   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 other reporting manager(s).)

[ ]   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).)



FORM 13F SUMMARY PAGE

Report Summary:

Number of Other Included Managers             0
Form 13F Information Table Entry Total       158
Form 13F Information Table Value Total:    384,836
                                          (thousands)

List of Other Included Managers:              NONE



                                                  FORM 13F INFORMATION TABLE

            COLUMN 1                COLUMN 2    COLUMN 3  COLUMN 4        COLUMN 5         COLUMN 6  COLUMN 7        COLUMN 8
-------------------------------- -------------- --------- -------- ---------------------- ---------- -------- ----------------------
                                                           VALUE      SHRS OR    SH/ PUT/ INVESTMENT  OTHER      VOTING AUTHORITY
         NAME OF ISSUER          TITLE OF CLASS   CUSIP   (x$1000)    PRN AMT    PRN CALL DISCRETION MANAGERS   SOLE    SHARED  NONE
-------------------------------- -------------- --------- -------- ------------- --- ---- ---------- -------- --------- ------- ----
                                                                                               
ABBOTT LABORATORIES              COM            002824100       43         1,212 SH       SOLE                    1,212       0    0
ABBOTT LABORATORIES              COM            002824100      286         8,110 SH       OTHER                       0   8,110    0
ACCENTURE CLASS -A-              SHS CL A       G1151C101       45           587 SH       SOLE                      587       0    0
ACCENTURE CLASS -A-              SHS CL A       G1151C101      298         3,929 SH       OTHER                       0   3,929    0
ANADARKO PETROLEUM               COM            032511107    4,802        54,913 SH       SOLE                   54,913       0    0
ANADARKO PETROLEUM               COM            032511107      199         2,276 SH       OTHER                       0   2,276    0
APACHE                           COM            037411105    4,735        61,365 SH       SOLE                   61,365       0    0
APACHE                           COM            037411105      196         2,543 SH       OTHER                       0   2,543    0
APPLE                            COM            037833100       33            74 SH       SOLE                       74       0    0
APPLE                            COM            037833100      222           501 SH       OTHER                       0     501    0
BARRICK GOLD                     COM            067901108   12,349       420,030 SH       SOLE                  420,030       0    0
BARRICK GOLD                     COM            067901108      611        20,799 SH       OTHER                       0  20,799    0
BILL BARRETT                     COM            06846N104    5,306       261,745 SH       SOLE                  261,745       0    0
BILL BARRETT                     COM            06846N104      220        10,847 SH       OTHER                       0  10,847    0
CABOT OIL & GAS                  COM            127097103    4,860        71,886 SH       SOLE                   71,886       0    0
CABOT OIL & GAS                  COM            127097103      201         2,979 SH       OTHER                       0   2,979    0
CANADIAN NATURAL RESOURCES       COM            136385101    4,828       150,612 SH       SOLE                  150,612       0    0
CANADIAN NATURAL RESOURCES       COM            136385101      200         6,241 SH       OTHER                       0   6,241    0
CARRIZO OIL & GAS                COM            144577103    4,830       187,411 SH       SOLE                  187,411       0    0
CARRIZO OIL & GAS                COM            144577103      200         7,766 SH       OTHER                       0   7,766    0
CHARLES SCHWAB                   COM            808513105       46         2,609 SH       SOLE                    2,609       0    0
CHARLES SCHWAB                   COM            808513105      309        17,450 SH       OTHER                       0  17,450    0
CHEVRON                          COM            166764100       43           364 SH       SOLE                      364       0    0
CHEVRON                          COM            166764100      289         2,435 SH       OTHER                       0   2,435    0
CIMAREX ENERGY                   COM            171798101    5,226        69,279 SH       SOLE                   69,279       0    0
CIMAREX ENERGY                   COM            171798101      217         2,871 SH       OTHER                       0   2,871    0
CISCO SYSTEMS                    COM            17275R102       41         1,961 SH       SOLE                    1,961       0    0
CISCO SYSTEMS                    COM            17275R102      274        13,115 SH       OTHER                       0  13,115    0
CME GROUP 'A'                    COM            12572Q105       47           763 SH       SOLE                      763       0    0
CME GROUP 'A'                    COM            12572Q105      314         5,110 SH       OTHER                       0   5,110    0
COACH                            COM            189754104       36           716 SH       SOLE                      716       0    0
COACH                            COM            189754104      240         4,792 SH       OTHER                       0   4,792    0
COCA-COLA                        COM            191216100       43         1,063 SH       SOLE                    1,063       0    0
COCA-COLA                        COM            191216100      288         7,115 SH       OTHER                       0   7,115    0
COLGATE-PALMOLIVE                COM            194162103       44           374 SH       SOLE                      374       0    0
COLGATE-PALMOLIVE                COM            194162103      296         2,505 SH       OTHER                       0   2,505    0
COMCAST 'A'                      CL A           20030N101       44         1,056 SH       SOLE                    1,056       0    0
COMCAST 'A'                      CL A           20030N101      297         7,062 SH       OTHER                       0   7,062    0
CONCHO RESOURCES                 COM            20605P101    4,988        51,194 SH       SOLE                   51,194       0    0
CONCHO RESOURCES                 COM            20605P101      207         2,122 SH       OTHER                       0   2,122    0
CONOCOPHILLIPS                   COM            20825C104    4,754        79,102 SH       SOLE                   79,102       0    0
CONOCOPHILLIPS                   COM            20825C104      466         7,757 SH       OTHER                       0   7,757    0
CONTINENTAL RESOURCES            COM            212015101    4,479        51,528 SH       SOLE                   51,528       0    0
CONTINENTAL RESOURCES            COM            212015101      186         2,135 SH       OTHER                       0   2,135    0
CREDICORP                        COM            G2519Y108    3,492        21,030 SH       DEFINED                     0  21,030    0
DENBURY RESOURCES                COM NEW        247916208    4,733       253,787 SH       SOLE                  253,787       0    0
DENBURY RESOURCES                COM            247916208      196        10,517 SH       OTHER                       0  10,517    0
DEVON ENERGY                     COM            25179M103    4,674        82,838 SH       SOLE                   82,838       0    0
DEVON ENERGY                     COM            25179M103      194         3,433 SH       OTHER                       0   3,433    0
ENCANA                           COM            292505104    4,819       247,787 SH       SOLE                  247,787       0    0
ENCANA                           COM            292505104      200        10,268 SH       OTHER                       0  10,268    0
EOG RESOURCES                    COM            26875P101    4,614        36,024 SH       SOLE                   36,024       0    0
EOG RESOURCES                    COM            26875P101      191         1,493 SH       OTHER                       0   1,493    0
EQT                              COM            26884L109    4,821        71,160 SH       SOLE                   71,160       0    0
EQT                              COM            26884L109      200         2,949 SH       OTHER                       0   2,949    0
EXCO RESOURCES                   COM            269279402    4,712       660,886 SH       SOLE                  660,886       0    0
EXCO RESOURCES                   COM            269279402      195        27,387 SH       OTHER                       0  27,387    0
EXXON MOBIL                      COM            30231G102       41           452 SH       SOLE                      452       0    0
EXXON MOBIL                      COM            30231G102      272         3,024 SH       OTHER                       0   3,024    0
FOREST OIL                       COM            346091705    4,342       825,502 SH       SOLE                  825,502       0    0






                                                  FORM 13F INFORMATION TABLE

            COLUMN 1                COLUMN 2    COLUMN 3  COLUMN 4        COLUMN 5         COLUMN 6  COLUMN 7        COLUMN 8
-------------------------------- -------------- --------- -------- ---------------------- ---------- -------- ----------------------
                                                           VALUE      SHRS OR    SH/ PUT/ INVESTMENT  OTHER      VOTING AUTHORITY
         NAME OF ISSUER          TITLE OF CLASS   CUSIP   (x$1000)    PRN AMT    PRN CALL DISCRETION MANAGERS   SOLE    SHARED  NONE
-------------------------------- -------------- --------- -------- ------------- --- ---- ---------- -------- --------- ------- ----
                                                                                               
FOREST OIL                       COM            346091705      180        34,209 SH       OTHER                       0  34,209    0
FREEPORT MCMORAN COPPER & GOLD   COM            35671D857   14,268       431,066 SH       SOLE                  431,066       0    0
FREEPORT MCMORAN COPPER & GOLD   COM            35671D857      659        19,920 SH       OTHER                       0  19,920    0
GENERAL MILLS                    COM            370334104       48           964 SH       SOLE                      964       0    0
GENERAL MILLS                    COM            370334104      318         6,447 SH       OTHER                       0   6,447    0
GILEAD SCIENCES                  COM            375558103       52         1,066 SH       SOLE                    1,066       0    0
GILEAD SCIENCES                  COM            375558103      349         7,130 SH       OTHER                       0   7,130    0
GOOGLE 'A'                       CL A           38259P508       43            54 SH       SOLE                       54       0    0
GOOGLE 'A'                       CL A           38259P508      291           367 SH       OTHER                       0     367    0
GULFPORT ENERGY                  COM NEW        402635304    5,082       110,879 SH       SOLE                  110,879       0    0
GULFPORT ENERGY                  COM NEW        402635304      211         4,595 SH       OTHER                       0   4,595    0
HEWLETT-PACKARD                  COM            428236103       63         2,627 SH       SOLE                    2,627       0    0
HEWLETT-PACKARD                  COM            428236103      419        17,576 SH       OTHER                       0  17,576    0
INTEL                            COM            458140100       41         1,889 SH       SOLE                    1,889       0    0
INTEL                            COM            458140100      276        12,637 SH       OTHER                       0  12,637    0
INTERNATIONAL BUSINESS MACHINES  COM            459200101       44           207 SH       SOLE                      207       0    0
INTERNATIONAL BUSINESS MACHINES  COM            459200101      296         1,390 SH       OTHER                       0   1,390    0
JOHNSON & JOHNSON                COM            478160104       46           561 SH       SOLE                      561       0    0
JOHNSON & JOHNSON                COM            478160104      306         3,751 SH       OTHER                       0   3,751    0
KELLOGG                          COM            487836108       46           711 SH       SOLE                      711       0    0
KELLOGG                          COM            487836108      306         4,754 SH       OTHER                       0   4,754    0
KODIAK OIL & GAS                 COM            50015Q100    4,483       493,133 SH       SOLE                  493,133       0    0
KODIAK OIL & GAS                 COM            50015Q100      186        20,435 SH       OTHER                       0  20,435    0
MARATHON OIL                     COM            565849106    4,666       138,386 SH       SOLE                  138,386       0    0
MARATHON OIL                     COM            565849106      193         5,735 SH       OTHER                       0   5,735    0
MECHEL -SPONSORED ADR-           ADR            583840103      203        40,103 SH       DEFINED                     0  40,103    0
MERCK & CO                       COM            58933Y105       42           945 SH       SOLE                      945       0    0
MERCK & CO                       COM            58933Y105      280         6,322 SH       OTHER                       0   6,322    0
MICROSOFT                        COM            594918104       42         1,484 SH       SOLE                    1,484       0    0
MICROSOFT                        COM            594918104      284         9,931 SH       OTHER                       0   9,931    0
MINAS BUENAVENTURA -ADR SPONS.-  ADR            204448104    1,430        55,092 SH       DEFINED                     0  55,092    0
MOBILE TELESYSTEMS -ADR SPONS.-  ADR            607409109    3,396       163,750 SH       DEFINED                     0 163,750    0
NEWFIELD EXPLORATION             COM            651290108    4,440       198,033 SH       SOLE                  198,033       0    0
NEWFIELD EXPLORATION             COM            651290108      184         8,206 SH       OTHER                       0   8,206    0
NEWMONT MINING                   COM            651639106   13,339       318,423 SH       SOLE                  318,423       0    0
NEWMONT MINING                   COM            651639106      611        14,589 SH       OTHER                       0  14,589    0
NOBLE ENERGY                     COM            655044105    4,757        41,128 SH       SOLE                   41,128       0    0
NOBLE ENERGY                     COM            655044105      197         1,704 SH       OTHER                       0   1,704    0
OASIS PETROLEUM                  COM            674215108    4,656       122,313 SH       SOLE                  122,313       0    0
OASIS PETROLEUM                  COM            674215108      193         5,069 SH       OTHER                       0   5,069    0
OCCIDENTAL PETROLEUM             COM            674599105    4,321        55,134 SH       SOLE                   55,134       0    0
OCCIDENTAL PETROLEUM             COM            674599105      179         2,285 SH       OTHER                       0   2,285    0
ORACLE                           COM            68389X105       38         1,162 SH       SOLE                    1,162       0    0
ORACLE                           COM            68389X105      251         7,773 SH       OTHER                       0   7,773    0
PENN WEST PETROLEUM              COM            707887105    4,950       460,486 SH       SOLE                  460,486       0    0
PENN WEST PETROLEUM              COM            707887105      205        19,083 SH       OTHER                       0  19,083    0
PEPSICO                          COM            713448108       46           579 SH       SOLE                      579       0    0
PEPSICO                          COM            713448108      307         3,879 SH       OTHER                       0   3,879    0
PFIZER                           COM            717081103       45         1,551 SH       SOLE                    1,551       0    0
PFIZER                           COM            717081103      300        10,378 SH       OTHER                       0  10,378    0
PHILIP MORRIS INTL               COM            718172109       43           466 SH       SOLE                      466       0    0
PHILIP MORRIS INTL               COM            718172109      289         3,117 SH       OTHER                       0   3,117    0
PIONEER NATURAL RESOURCES        COM            723787107    4,490        36,139 SH       SOLE                   36,139       0    0
COMPANY
PIONEER NATURAL RESOURCES        COM            723787107      186         1,498 SH       OTHER                       0   1,498    0
COMPANY
PLAINS EXPLORATION & PRODUCTION  COM            726505100    4,656        98,090 SH       SOLE                   98,090       0    0
PLAINS EXPLORATION & PRODUCTION  COM            726505100      193         4,065 SH       OTHER                       0   4,065    0
PROCTER & GAMBLE                 COM            742718109       45           584 SH       SOLE                      584       0    0
PROCTER & GAMBLE                 COM            742718109      301         3,907 SH       OTHER                       0   3,907    0






                                                  FORM 13F INFORMATION TABLE

            COLUMN 1                COLUMN 2    COLUMN 3  COLUMN 4        COLUMN 5         COLUMN 6  COLUMN 7        COLUMN 8
-------------------------------- -------------- --------- -------- ---------------------- ---------- -------- ----------------------
                                                           VALUE      SHRS OR    SH/ PUT/ INVESTMENT  OTHER      VOTING AUTHORITY
         NAME OF ISSUER          TITLE OF CLASS   CUSIP   (x$1000)    PRN AMT    PRN CALL DISCRETION MANAGERS   SOLE    SHARED  NONE
-------------------------------- -------------- --------- -------- ------------- --- ---- ---------- -------- --------- ------- ----
                                                                                               
QUALCOMM                         COM            747525103       42           627 SH       SOLE                      627       0    0
QUALCOMM                         COM            747525103      281         4,193 SH       OTHER                       0   4,193    0
RANGE RESOURCES CORP             COM            75281A109    4,643        57,296 SH       SOLE                   57,296       0    0
RANGE RESOURCES CORP             COM            75281A109      192         2,374 SH       OTHER                       0   2,374    0
ROSETTA RESOURCES                COM            777779307    4,401        92,494 SH       SOLE                   92,494       0    0
ROSETTA RESOURCES                COM            777779307      182         3,833 SH       OTHER                       0   3,833    0
SANDRIDGE ENERGY                 COM            80007P307    4,131       783,868 SH       SOLE                  783,868       0    0
SANDRIDGE ENERGY                 COM            80007P307      171        32,483 SH       OTHER                       0  32,483    0
SCHLUMBERGER                     COM            806857108       42           558 SH       SOLE                      558       0    0
SCHLUMBERGER                     COM            806857108      280         3,736 SH       OTHER                       0   3,736    0
SM ENERGY                        COM            78454L100    4,734        79,944 SH       SOLE                   79,944       0    0
SM ENERGY                        COM            78454L100      196         3,313 SH       OTHER                       0   3,313    0
SOUTHERN COPPER                  COM            84265V105    2,074        55,216 SH       DEFINED                     0  55,216    0
SOUTHWESTERN ENERGY              COM            845467109    4,659       125,027 SH       SOLE                  125,027       0    0
SOUTHWESTERN ENERGY              COM            845467109      193         5,181 SH       OTHER                       0   5,181    0
STONE ENERGY                     COM            861642106    4,858       223,352 SH       SOLE                  223,352       0    0
STONE ENERGY                     COM            861642106      201         9,256 SH       OTHER                       0   9,256    0
TALISMAN ENERGY                  COM            87425E103    4,444       363,493 SH       SOLE                  363,493       0    0
TALISMAN ENERGY                  COM            87425E103      184        15,063 SH       OTHER                       0  15,063    0
TECK RESOURCES 'B'               COM            878742204   11,691       415,283 SH       SOLE                  415,283       0    0
TECK RESOURCES 'B'               COM            878742204      740        26,301 SH       OTHER                       0  26,301    0
ULTRA PETROLEUM                  COM            903914109    5,364       266,859 SH       SOLE                  266,859       0    0
ULTRA PETROLEUM                  COM            903914109      222        11,059 SH       OTHER                       0  11,059    0
VALE -ADR SPONS.-                ADR            91912E105   13,958       807,310 SH       SOLE                  807,310       0    0
VALE -ADR SPONS.-                ADR            91912E105      742        42,887 SH       OTHER                       0  42,887    0
VANGUARD 500 INDEX ETF           S&P 500        922908413  102,655     1,432,933 SH       SOLE                1,432,933       0    0
VERIZON COMMUNICATIONS           COM            92343V104       45           916 SH       SOLE                      916       0    0
VERIZON COMMUNICATIONS           COM            92343V104      301         6,130 SH       OTHER                       0   6,130    0
VERMILION ENERGY                 COM            923725105    4,618        89,201 SH       SOLE                   89,201       0    0
VERMILION ENERGY                 COM            923725105      191         3,696 SH       OTHER                       0   3,696    0
VISA 'A'                         COM            92826C839       44           258 SH       SOLE                      258       0    0
VISA 'A'                         COM            92826C839      293         1,726 SH       OTHER                       0   1,726    0
W&T OFFSHORE                     COM            92922P106    4,510       317,636 SH       SOLE                  317,636       0    0
W&T OFFSHORE                     COM            92922P106      187        13,163 SH       OTHER                       0  13,163    0
WAL-MART STORES                  COM            931142103       44           584 SH       SOLE                      584       0    0
WAL-MART STORES                  COM            931142103      293         3,911 SH       OTHER                       0   3,911    0
WHITING PETROLEUM HOLDINGS       COM            966387102    4,726        92,953 SH       SOLE                   92,953       0    0
WHITING PETROLEUM HOLDINGS       COM            966387102      196         3,852 SH       OTHER                       0   3,852    0
WPX ENERGY 'A'                   CL A           98212B103    4,804       299,883 SH       SOLE                  299,883       0    0
WPX ENERGY 'A'                   CL A           98212B103      199        12,427 SH       OTHER                       0  12,427    0