Classof securities(4)

Number of securities

Person's votes(5)

Votingpower (6)

ord

167,986,663

167,986,663

5.00

ADR 1:1

600

600

0.00

Holder of relevant interest

Nature of relevant interest (7)

Classandnumber of securities

Annexure A & D

Holder of relevant interest

Registered holder of securities

Personentitled to be registeredasholder (8)

Classandnumber of securities

see Annexure A

Holder of relevant interest

Dateof acquisition

Consideration (9)

Classandnumber of securities

Cash

Non-cash

see Annexure B

603 page 1/2 15 July 2001

Form603

CorporationsAct 2001 Section 671B

Notice of initial substantial holder

To CompanyName/Scheme ACN/ARSN

1. Details of substantial holder (1)

Name

ACN/ARSN (if applicable)

WESTPAC BANKING CORP

007 457 141

BlackRock Group (BlackRock Inc. and subsidiaries named in Annexures

to this form)

Theholder became a substantial holder on 30 / 03/ 2017

  1. Details of voting power

  2. Details of relevant interests

  3. Details of present registered holders

  4. Consideration

Thetotal number of votesattachedtoall thevotingsharesin thecompanyor votinginterests in thescheme that thesubstanti al holder or anassociate(2)hada relevant interest (3)inonthedate thesubstantial holder becameasubstantial holder areasfollows:

Thenature of therelevant interest thesubstantial holder or anassociate hadin the followingvotingsecuritieson thedate thesubstantial holder became a substantial holder areasfollows:

Thepersonsregisteredasholders of thesecuritiesreferred to in paragraph3 aboveare as follows:

Theconsiderationpaid for eachrelevant interest referred to in paragraph3 above, andacquired in the four monthsprior to the daythat thesubstantial holder became a substantial holder isasfollows:

603 page 2/2 15 July 2001

  1. Associates

    Thereasonsthepersonsnamed in paragraph3 aboveare associatesof thesubstantial holder are as follows:

    Name andACN/ARSN (if applicable)

    Nature of association

    see Annexure A

  2. Addresses

Theaddressesof personsnamedin this formareasfollows:

Name

Address

see Annexure C

Signature

print name Dennis Ivers

capacity Authorised Signatory*

sign here date

03 / 04

/ 2017

DIRECTIONS
  1. If thereareanumber of substantial holders withsimilaror relatedrelevant interests (eg. acorporationandits relatedc orporations, or the manager andtrusteeof an equity trust), thenamescouldbeincludedinanannexure to theform. If therelevant interestsof agroupof personsareessentiallysimilar, theymaybereferredto throughout theformasaspecificallynamedgroupif themembershipof eachgroup, with thenames andaddressesof members isclearlyset out inparagraph7of the form.

  2. See thedefinitionof "associate" in section9 of theCorporationsAct 2001.

  3. See thedefinitionof "relevant interest" in sections608and671B(7)of theCorporationsAct 2001.

  4. Thevotingsharesof acompanyconstituteoneclassunlessdividedintoseparateclasses.

  5. Thetotal number of votesattachedtoall thevotingsharesin thecompanyor votinginterests in thescheme(if any)that thepersonor anassociatehasa relevant interest in.

  6. Theperson'svotesdividedbythetotal votesin thebodycorporateor schememultipliedby100.

  7. Includedetailsof:

    1. anyrelevant agreement orother circumstancesbywhichtherelevant interest wasacquired. If subsection671B(4)applies, a copyof anydocument settingout the termsof anyrelevant agreement, anda statement by thepersongiving full andaccurate details of anycontract, scheme orarrangement, must accompany this form, together witha writtenstatement certifyingthiscontract, schemeor arrangement; and

    2. anyqualificationof thepower of apersontoexercise, control theexerciseof, or influencetheexerciseof, thevotingpo wersor disposal of thesecuritiesto whichtherelevant interest relates(indicatingclearly theparticular securitiestowhichthequalificationapplies).

      See thedefinitionof "relevant agreement" in section9 of theCorporationsAct 2001.

    3. If thesubstantial holder isunable todeterminetheidentityof theperson(eg. if therelevant interest arisesbecauseof anoption)write "unknown".

    4. Detailsof theconsiderationmust includeanyandall benefits,moneyandother, that anypersonfromwhoma relevant interest wasacquiredhas, ormay, become entitledto receivein relationto that acquisition. Detailsmust beincludedevenif thebenefit isconditional onthehappeningor not of acontingency. Detailsmust be includedof anybenefit paidonbehalf of thesubstantial holder or itsassociate inrelationto theacquisitions, evenif they arenot paiddirectly to thepersonfromwhom therelevant interest wasacquired.

    5. This is Annexure A of 8 pages referred to in form 603 Notice of initial substantial shareholder

      Annexure A

      03-Apr-17

      Dennis Ivers, Authorised Signatory

      Date

      3. Details of Relevant Interests

      4. Details of present registered holders

      6. Associates

      Holder of Relevant Interests

      Name and ACN / ARSN (if applicable)

      Nature of Relevant Interest

      Registered Holder of Securities

      Person entitled to be registered as holder

      Class and number of Securities

      Person's votes

      Nature of Association

      BlackRock (Netherlands) B.V.

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      BNYM-BANK OF NY BRUS

      ord

      48,769

      48,769

      subsidiary of BlackRock Inc.

      BlackRock (Netherlands) B.V.

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      JPM-JP MORGAN CHASE - NEW YORK

      ord

      155,327

      155,327

      subsidiary of BlackRock Inc.

      BlackRock (Netherlands) B.V.

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      SSB-SSB NEW YORK INSTITUTIONAL

      ord

      491,235

      491,235

      subsidiary of BlackRock Inc.

      BlackRock (Singapore) Limited

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      SSB-STATE STREET LONDON

      ord

      1,505

      1,505

      subsidiary of BlackRock Inc.

      BlackRock Advisors (UK) Limited

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      BNYM-BONY EUROPE - LONDON

      ord

      9,940,539

      9,940,539

      subsidiary of BlackRock Inc.

      BlackRock Advisors (UK) Limited

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      JPM - J.P. Morgan Zurich

      ord

      248,536

      248,536

      subsidiary of BlackRock Inc.

      BlackRock Advisors (UK) Limited

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      JPM-JPM CHASE - LONDON

      ord

      2,074,518

      2,074,518

      subsidiary of BlackRock Inc.

      BlackRock Advisors (UK) Limited

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      KAS-KAS BANK - AMSTERDAM

      ord

      38,173

      38,173

      subsidiary of BlackRock Inc.

      BlackRock Advisors (UK) Limited

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      NT-NORTHERN TRUST UK

      ord

      890,451

      890,451

      subsidiary of BlackRock Inc.

      WBC page 1 of 8

      Holder of Relevant Interests

      Name and ACN / ARSN (if applicable)

      Nature of Relevant Interest

      Registered Holder of Securities

      Person entitled to be Class and number of Person's Nature of registered as holder Securities votes Association

      BlackRock Advisors (UK) Limited

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      RBC-DEXIA BIL- LONDON

      ord

      636,332 63

      6,332 subsidiary of BlackRock Inc.

      BlackRock Advisors (UK) Limited

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      SSB-STATE STREET DUBLIN

      ord

      7,183,149 7,18

      3,149 subsidiary of BlackRock Inc.

      BlackRock Advisors (UK) Limited

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      STATE STREET BANK, MUNICH, ZURICH BRANCH

      ord

      17,523 1

      7,523 subsidiary of BlackRock Inc.

      BlackRock Advisors, LLC

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      BBH-BROWN BROTHERS HARRIMAN & CO - NEW YORK

      ord

      80,297 8

      0,297 subsidiary of BlackRock Inc.

      BlackRock Advisors, LLC

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      BNYM-THE BANK OF NEW YORK

      ord

      37,679 3

      7,679 subsidiary of BlackRock Inc.

      BlackRock Advisors, LLC

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      SSB-STATE STREET MUTUAL FUNDS - BOSTON

      ord

      1,586,677 1,58

      6,677 subsidiary of BlackRock Inc.

      BlackRock Asset Management Canada Limited

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      NT-NORTHERN TRUST CO. - CHICAGO

      ord

      3,992

      3,992 subsidiary of BlackRock Inc.

      BlackRock Asset Management Canada Limited

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      SSB-SSB NEW YORK INSTITUTIONAL

      ord

      124,906 12

      4,906 subsidiary of BlackRock Inc.

      BlackRock Asset Management Canada Limited

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      SSB-STATE STREET SACRAMENTO

      ord

      1,434,433 1,43

      4,433 subsidiary of BlackRock Inc.

      BlackRock Asset Management Deutschland AG

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      SSB-STATE STREET BANK, GERMANY

      ord

      456,141 45

      6,141 subsidiary of BlackRock Inc.

      BlackRock Asset Management North Asia Limited

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      BNYM-BONY EUROPE - LONDON

      ord

      74,789 7

      4,789 subsidiary of BlackRock Inc.

      BlackRock Asset Management North Asia Limited

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      BNYM-BONY LUXEMBOURG

      ord

      847,778 84

      7,778 subsidiary of BlackRock Inc.

      BlackRock Asset Management North Asia Limited

      Power to control the exercise of a right to vote attached to securities and/or the power to dispose of securities as investment manager or trustee.

      CITI-CITIBANK, HONG KONG

      ord

      233,602 23

      3,602 subsidiary of BlackRock Inc.

      WBC page 2 of 8

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