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Exhibit 5.4

One Bunhill Row

London EC1Y 8YY

T +44 (0)20 7600 1200

F +44 (0)20 7090 5000

	13 November 2025

	Your reference

	Our reference
The Directors	DVH/RXUD
Genpact UK Finco plc
6 Lloyds Avenue	Direct line
Suite 4cl	+44 (0)20 7090 5083
London
EC3N 3AX

Dear Sirs,

Registration Statement on Form S-3ASR of, among others, Genpact UK Finco plc dated 13 November 2025 (the “Registration Statement”)

Introduction

We have acted as legal advisers to Genpact (UK) Limited (“Genpact UK”) as to English law in connection with the proposed registration under the United States Securities Act of 1933 (as amended) the “Securities Act”) of, among other things:

(a)

debt securities (the “Guaranteed Debt Securities”) co-issued by Genpact USA, Inc. (the “U.S. Company”) and Genpact Luxembourg S.à r.l. (the “Luxembourg Company”) and guarantees (the “Guarantees”) of the Guaranteed Debt Securities by Genpact UK Finco plc (the “Company”); and

(b)

debt securities of the Company, co-issued with the U.S. Company (the “Company Debt Securities”, and together with the Guaranteed Debt Securities, the “Debt Securities”).

We have taken instructions solely from Genpact UK, and at the request of Genpact UK this opinion is addressed to you and delivered in connection with the Registration Statement to be filed with the United States Securities and Exchange Commission on 13 November

RJ Turnill

SR Galbraith

JAD Marks

DJO Schaffer

DR Johnson

RA Swallow

CS Cameron

E Michael

RR Ogle

HL Davies

JC Putnis

RA Sumroy

JC Cotton

CNR Jeffs

SR Nicholls

MJ Tobin

DG Watkins

BKP Yu

EC Brown

J Edwarde

AD Jolly

JS Nevin

RA Byk

GA Miles

GE O'Keefe

MD Zerdin

IAM Taylor

DA Ives

MC Lane

LMC Chung

RJ Smith

MD’AS Corbett

PIR Dickson

IS Johnson

RM Jones

EJ Fife

JP Stacey

LJ Wright

JP Clark

WHJ Ellison

AM Lyle-Smythe

A Nassiri

DE Robertson

RA Innes

CP McGaffin

CL Phillips

SVK Wokes

NSA Bonsall

RCT Jeens

V MacDuff

PL Mudie

DM Taylor

RJ Todd

WJ Turtle

OJ Wicker

DJO Blaikie

CVK Boney

F de Falco

SNL Hughes

PR Linnard

KA O’Connell

N Yeung CJCN Choi

NM Pacheco

CL Sanger

HE Ware

HJ Bacon

TR Blanchard

NL Cook

AJ Dustan

HEB Hecht

CL Jackson

OR Moir

S Shah

G Kamalanathan

JE Cook

CA Cooke

LJ Houston

CW McGarel-Groves

PD Wickham

RR Hilton

KM Howes

CR Osborne

MJ Sandler

CM Sharpe

JM Slade

WCW Brennand

DJG Hay

TG Newey

LJE Nsoatabe

PJC O’Malley

SE Osprey

DA Shone

S Sriram

HK Sumanasuriya

SC Tysoe

AJJ Chadd

RA Francis-Pike

AF Liaqat

TR Peacock

TXT Zhuo

AT Bulfin

EA Couzens

DP Griffith-Jones

OM Ladrowska

DM Mewton

JOD Wharton

Authorised and regulated
by the Solicitors
Regulation Authority
Firm SRA number 55388

2025. Other than in connection with the Registration Statement and the issuance of any Debt Securities or Guarantees, this opinion is not to be transmitted to anyone else nor is it to be reproduced, quoted, summarised or relied upon by anyone else or for any other purpose or quoted or referred to in any public document or filed with anyone without our express written consent. We have not been concerned with investigating or verifying the facts set out in the Registration Statement.

We have taken instructions solely from Genpact UK in connection with the Transaction and have been requested by Genpact UK to deliver this opinion to you. We have not advised you in connection with the Transaction and are under no obligation to do so. Nothing in this letter nor the delivery of it to you shall create or constitute a solicitor-client (or any other fiduciary) relationship between us, nor prevent us from advising and representing Genpact UK or any of its affiliates from time to time in relation to any matters in connection with the Transaction or any related or unrelated matter. This is the case even if you are, or have been, a client of Slaughter and May in relation to another matter/transaction.

To the extent permitted by applicable law and regulation, you may rely on this letter only on the condition that your recourse to us in respect of the matters addressed in this letter is against the firm’s assets only and not against the personal assets of any individual partner. The firm’s assets for this purpose consists of all assets of the firm’s business, including any right of indemnity of the firm or its partners under the firm’s professional indemnity insurance policies, but excluding any right to seek contribution or indemnity from or against any partner of the firm or person working for the firm or similar right. In addition, where our liability in respect of the matters addressed in this letter could be joint and several with another person, our liability to you shall be limited to such sum as we ought reasonably to pay having regard to our responsibility for the damage in question.

For the purposes of this opinion, we have examined copies of each of the following documents:

(a)

the indenture, filed as Exhibit 4.5 to the Registration Statement, dated as of 16 March 2021, by and among the U.S. Company and the Luxembourg Company, as co-issuers, Genpact Limited, as guarantor and Computershare Trust Company, National Association (as successor to Wells Fargo Bank, National Association), as trustee (the “2021 Indenture”);

(b)

the form of indenture, filed as Exhibit 4.7 to the Registration Statement, to be entered into among the Company and the U.S. Company, as co-issuers, the Luxembourg Company and Genpact Limited, as guarantors, and Computershare Trust Company, National Association, as trustee (the “UK / USA Indenture”, and together with the 2021 Indenture, the “Indentures”);

(c)

the memorandum of association of the Company filed as Exhibit 3.6 to the Registration Statement;

Page 2/The Directors, Genpact UK Finco plc/13 November 2025

(d)

the articles of association of the Company filed as Exhibit 3.7 to the Registration Statement; and

(e)

a secretary’s certificate of the Company dated the date hereof and the documents annexed thereto.

For the purposes of this letter, we have also carried out (i) a search at the Registrar of Companies in respect of the Company on 13 November 2025 and (ii) a search at the Central Registry of Winding-Up Petitions in respect of the Company on 13 November 2025 (together, the “Searches”).

This letter sets out our opinion on certain matters of English law as at today’s date and as currently applied by the English courts as at the date of this letter. We have not made any investigation of, and do not express any opinion on, any other law, in particular the laws of the State of New York (“New York law”) and of the United States of America. This letter is to be governed by and construed in accordance with English law.

Assumptions

For the purposes of this letter, we have assumed each of the following:

(a)

all signatures (including those effected electronically) are genuine;

(b)

the conformity to original documents of all copy (including electronic copy) documents examined by us;

(c)

the capacity, power and authority of each party (other than the Company) to execute, deliver and exercise its rights and perform its obligations under the Indentures and the Debt Securities;

(d)

that the Indentures, the Debt Securities and the Guarantees have, or will have, been duly executed and delivered by the parties thereto in the form examined by us (subject to any minor amendment having no bearing on our opinion set out in this letter);

(e)

the Debt Securities and the Guarantees will be duly issued, authenticated and delivered in accordance with the provisions of the relevant Indenture;

(f)

that no law of any jurisdiction outside England and Wales would render such issue, authentication or delivery, or the execution, authentication, delivery or issue of the Indentures, the Debt Securities or the Guarantees, illegal, ineffective or contrary to public policy and that, insofar as any obligation under the Indentures, the Debt Securities or the Guarantees is performed in, or is otherwise subject to, any jurisdiction other than England and Wales, its performance will not be illegal, ineffective or contrary to public policy in that jurisdiction;

Page 3/The Directors, Genpact UK Finco plc/13 November 2025

(g)

that each Debt Security and Guarantee will be in the form set out in the relevant Indenture and will be subject to the terms and conditions of that Indenture, and that the aggregate principal amount of any Debt Security and/or Guarantee issued or guaranteed by the Company will fail within any limits set by the Company or its board of directors;

(h)

that the execution of (or accession to) the Indentures, the Company Debt Securities or the Guarantees will not cause the Company or its directors to be in default under article 3 (Directors’ general authority) of the Company’s articles of association;

(i)

that each of the Indentures, the Company Debt Securities and the Guarantees have, or will have, been entered into (or acceded to) by the Company in good faith;

(j)

that the terms and conditions applicable to the Debt Securities and the Guarantees will not be inconsistent with the Registration Statement or any applicable prospectus supplement;

(k)

that the Indentures, the Debt Securities and the Guarantees have the same meaning and effect as if they were governed by English law;

(l)

that each of the Indentures, the Debt Securities and the Guarantees is in the best interests and to the advantage of the Company;

(m)

that the directors of the Company have, and will have, complied with their duties as directors in so far as relevant to this opinion letter;

(n)

any subordinate legislation made under the European Communities Act 1972 and relevant to this opinion is valid in all respects;

(o)

the accuracy and completeness of the statements made in, and the documents annexed to, the certificate referred to in paragraph 5(e) above, and that such certificate and statements remain true, accurate and complete as at the date of this opinion and as at each date on which (and with respect to) any Debt Securities and/or any Guarantees are, from time to time, issued;

(p)

that (i) the information disclosed by the Searches was complete, accurate and up to date as at the date each was conducted and has not since then been altered or added to; and (ii) the Searches did not fail to disclose any information relevant for the purposes of this opinion;

(q)

that since 16 March 2021 no amendments have been made to the 2021 Indenture, and that the 2021 Indenture continues in full force and effect as at the date hereof;

(r)

that (i) no application or filing has been made or petition presented to a court, and no order has been made by a court, for the winding-up or administration of, or commencement of a moratorium in relation to, the Company, and no step has been taken to strike off or dissolve the Company; (ii) no proposal for a voluntary

Page 4/The Directors, Genpact UK Finco plc/13 November 2025

arrangement has been made, or moratorium obtained, in relation to the Company under Part I or Part 1A of the Insolvency Act 1986 (as amended); (iii) the Company has not given any notice in relation to or passed any winding-up resolution; (iv) no liquidator, administrator, monitor, nominee, supervisor, receiver, administrative receiver, trustee in bankruptcy or similar officer has been appointed in relation to the Company or any of its assets or revenues, and no notice has been given or filed in relation to the appointment of such an officer; and (v) no insolvency proceedings or analogous procedures have been commenced in any jurisdiction outside of England and Wales in relation to the Company or any of its assets or revenues; and

(s)

all acts, conditions or things required to be fulfilled, performed or effected in connection with each Indenture, each Debt Security and each Guarantee under the laws of any jurisdiction other than England and Wales have been duly fulfilled, performed and effected in accordance with the laws of each such jurisdiction.

Opinion

Based on and subject to the foregoing and subject to the reservations below and to any matters not disclosed to us, we are of the opinion that:

(a)

the Company is a public company limited by shares duly incorporated under the laws of England and Wales and is a validly existing company;

(b)

the Company has the capacity and power to sign and deliver the Company Debt Securities, the UK / USA Indenture and Guarantees under the 2021 Indenture and, once it is party to such Indentures, to exercise its rights and perform its obligations under the Company Debt Securities, the Guarantees and the Indentures, as the case may be;

(c)

the signing and delivery by the Company of the Company Debt Securities, the UK / USA Indenture and the Guarantees under the 2021 Indenture is not, and the exercise of its rights and the performance of its obligations under the Company Debt Securities, the Guarantees and the Indentures once duly executed and delivered are not, prohibited by the Memorandum of Association or the Articles of Association of the Company; and

(d)

on the assumption that the Company Debt Securities, the Guarantees and the UK / USA Indenture will, when duly executed and unconditionally delivered, create valid and binding obligations of the parties under New York law, English law will not prevent any provision of the Company Debt Securities, the Guarantees or the Indentures from, when duly executed and unconditionally delivered, being valid and binding obligations of the Company.

Reservations

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10.

Our opinion is qualified by the following reservations:

(a)

we express no opinion with respect to the registration, offering or issuance of common shares, preference shares or depositary shares under or in connection with the Registration Statement, which we understand would not involve the Company or matters of English law;

(b)

the term “binding” is used in this opinion to describe an obligation of the type which the English courts would enforce. This does not mean that the obligation will necessarily be legally binding and enforceable in all circumstances in accordance with its terms;

(c)

undertakings, covenants and indemnities contained in the Indentures may not be enforceable before an English court insofar as they purport to require payment or reimbursement of the costs of any unsuccessful litigation brought before an English court or where the court itself has made an order for costs;

(d)

to the extent it relates to United Kingdom stamp duties, any undertaking or indemnity given by the Company may be void under section 117 of the Stamp Act 1891;

(e)

insofar as any obligation under an Indenture, the Debt Securities or the Guarantees is to be performed in any jurisdiction other than England and Wales, an English court may have to have regard to the law of that jurisdiction in relation to the manner of performance and the steps to be taken in the event of defective performance;

(f)

we express no opinion as to whether specific performance, injunctive relief or any other form of equitable remedy would be available in respect of any obligation of the Company under or in respect of the Indentures, any Debt Security or any Guarantee;

(g)

we have not been asked to, and we do not, express any opinion as to any taxation (including value added tax), including as it will or may arise in connection with the Registration Statement, the Indentures or any issue or offering of any Debt Securities or any Guarantees;

(h)

the obligations of the Company under or in respect of the Indentures, the Debt Securities and the Guarantees will be subject to any law from time to time in force relating to insolvency, liquidation or administration or any other law or legal procedure affecting generally the enforcement of creditors’ rights;

(i)

in our opinion, under English law there is doubt as to the enforceability in England and Wales, in original actions or in actions for enforcement of judgments of United

Page 6/The Directors, Genpact UK Finco plc/13 November 2025

States courts, of liabilities predicated upon United States federal or state securities laws;

(j)

the Searches are not conclusive as to whether or not insolvency proceedings have been commenced in relation to the Company or any of its assets. For example, information required to be filed with the Registrar of Companies or the Central Registry of Winding-Up Petitions is not in all cases required to be filed immediately (and may not be filed at all or on time); once filed, the information may not be made publicly available immediately (or at all); information filed with a District Registry or County Court may not, and in the case of administrations will not, become publicly available at the Central Registry of Winding-Up Petitions; and the Searches may not reveal whether insolvency proceedings or analogous procedures have been commenced in jurisdictions outside England and Wales. However, the certificate referred to in paragraph 5(e) above confirms that to the signatory’s knowledge, no such event had occurred as at the date hereof;

(k)

where all elements relevant to the situation at the date of an Indenture, a Debt Security or a Guarantee, other than the choice of New York law, are located in one or more of the United Kingdom and a Member State or States (as defined in The Law Applicable to Contractual and Non-Contractual Obligations (Amendment etc.) (EU Exit) Regulations 2019), provisions of retained EU law (as defined in the European Union (Withdrawal) Act 2018 (as amended)) which cannot be derogated from by contract may apply;

(l)

we express no opinion as to whether the provisions dealing with the choice of law in respect of non-contractual claims will be effective. Where all elements relevant to the situation at the time the event giving rise to the damage occurs, other than the choice of New York law as the governing law of any non-contractual obligations arising from or in connection with an Indenture, a Debt Security or a Guarantee, are located in one or more of the United Kingdom and a Member State or States (as defined in The Law Applicable to Contractual and Non-Contractual Obligations (Amendment etc.) (EU Exit) Regulations 2019), provisions of retained EU law (as defined in the European Union (Withdrawal) Act 2018 (as amended)) which cannot be derogated from by contract may apply; and

(m)

this opinion is subject to any limitations arising from:

(i)

United Nations, European Union or United Kingdom sanctions or other similar measures; and

(ii)

EU Regulation 2271/96 (as it forms part of English law pursuant to the European Union (Withdrawal) Act 2018 (as amended)) protecting against the effects of the extra-territorial application of legislation adopted by a third country (the “Blocking Regulation”) and legislation related to the Blocking Regulation.

Page 7/The Directors, Genpact UK Finco plc/13 November 2025

We hereby consent to the filing of this opinion as an exhibit to the Registration Statement and to the references to this opinion therein and to the use of our name under the heading “Legal Matters” in the Registration Statement. In giving this consent we do not admit that we are “experts” under the United States Securities Act of 1933 (as amended) or the rules and regulations of the United States Securities and Exchange Commission issued thereunder with respect to any part of the Registration Statement, including this opinion.

Yours faithfully,

/s/ Slaughter and May

Page 8/The Directors, Genpact UK Finco plc/13 November 2025