Exhibit 99.1

HQ/CS/CL.24B/15187

26 July 2013

Sir,

Sub : Un-audited Financial Results for the period ended 30 June 2013.

Pursuant to Clause 41 of the Equity Listing Agreement with Indian Stock Exchanges the following documents are submitted:

a) Un-audited Financial Results (Provisional, according to Indian GAAP) for the period ended 30 June 2013, which has been approved by the Board of Directors in their meeting, held on 26 July 2013. (Attachment “A”)

b) Limited Review Report of the auditors on the unaudited financial results for the quarter ended 30 June 2013 (Attachment “B”).

c) The press release in this regards is also attached (Attachment “C”).

Thanking you,

Yours faithfully,

For Tata Communications Limited

Satish Ranade

Company Secretary & CLO

To:

1) Security Code 500483, The Stock Exchange, Mumbai. Fax No. (22) 2272 2037,39,41

2) Security Code TATACOMM, The Asst. Manager (Listing), National Stock Exchange of India Limited. Fax Nos.: (22) 2659 8237,238, 347,348

3) National Securities Depository Ltd. Fax Nos. : 2497 2993.

4) The Bank of New York. Fax No. 2204 4942.

5) Sharepro Services (India) Pvt. Ltd. Fax No. 2837 5646

6) Marc H. Iyeki, Director, New York Stock Exchange, Fax No: (212) 656-5071,72

7) Central Depository Services (India) Limited. Fax : 2267 3199.

Tata Communications Limited

Plot C 21 & C 36 ‘G’ Block BandraKurlaComplex, Mumbai 400098 India

Regd. Office : VSB Mahatma Gandhi Road Fort Mumbai – 400 001 India

Tel 91 22 6657 8765 Fax 91 22 6639 5162 website www.tatacommunications.com

TATA COMMUNICATIONS LIMITED

REGD. OFFICE: VSB, M.G. ROAD, FORT, MUMBAI-400001.

( in Lakhs)

A. STATEMENT OF STANDALONE UNAUDITED FINANCIAL RESULTS FOR THE QUARTER ENDED JUNE 30, 2013

Part I

		Standalone
	Particulars	For the quarter ended								For the year ended
		June 30 2013			March 31 2013			June 30 2012		March 31 2013
		(unaudited)			(audited) (Refer note 2)			(unaudited)		(audited)
1	Income from Operations		114065			115023			108222		441612
2	Expenses
	a. Network and transmission		49921			46196			52360		196320
	b. Employee benefit		15630			15673			16865		63946
	c. Depreciation and amortization		19059			19790			18071		76240
	d. Other		21211			20407			19980		81325
	e. Total Expenditure (2a to 2d)		105821			102066			107276		417831
3	Profit / (Loss) from Operations before Other Income, Finance costs and Exceptional Items (1 - 2)		8244			12957			946		23781
4	Other Income		6446			6839			18705		38022
5	Profit / (Loss) from Ordinary Activities before Finance costs and Exceptional Items (3 + 4)		14690			19796			19651		61803
6	Finance Cost		1586			2158			3292		11969
7	Profit / (Loss) from Ordinary activities after Finance costs but before Exceptional Items (5 - 6)		13104			17638			16359		49834
8	Exceptional Items loss/(gain)		(21622	)		(18336	)		—		(15835	)
9	Profit / (Loss) from Ordinary Activities before Tax (7 - 8)		34726			35974			16359		65669
10	Tax Expense		11555			9019			4947		18145
11	Net Profit / (Loss) from Ordinary Activities after Tax (9 - 10)		23171			26955			11412		47524
12	Extraordinary Items (net of Tax Expense)		—			—			—		—
13	Net Profit/(Loss) for the period (11 - 12)		23171			26955			11412		47524

( in Lakhs)

A. STATEMENT OF STANDALONE UNAUDITED FINANCIAL RESULTS FOR THE QUARTER ENDED JUNE 30, 2013

Part I

		Standalone
	Particulars	For the quarter ended						For the year ended
		June 30 2013		March 31 2013		June 30 2012		March 31 2013
		(unaudited)		(audited) (Refer note 2)		(unaudited)		(audited)
14	Paid up Equity Share Capital (Face value of 10 per share)		28500		28500		28500		28500
15	Paid up Debt Capital								77470
16	Reserves excluding Revaluation Reserve								702495
17	Debenture Redemption Reserve								35013
18	Earnings Per Share (EPS)		8.13		9.46		4.00		16.68
	Basic and diluted earnings per share before and after Extraordinary Items ( )

A. STATEMENT OF STANDALONE UNAUDITED FINANCIAL RESULTS FOR THE QUARTER ENDED JUNE 30, 2013

Part II

	For the quarter ended									For the year ended
A) Particulars of Shareholding	June 30 2013			March 31 2013			June 30 2012			March 13 2013
1. Public shareholding
a. Number of shares		58198109			53803177			51388457			53803177
b. Percentage of shareholding		21.28	%		18.88	%		18.03	%		18.88	%
2. Promoters and Promoter Group Shareholding
a. Pledged / Encumbered
- Number of Shares		10000000			10000000			10000000			10000000
- Percentage of Shares (as a % of the total shareholding of promoters and promoter group)		4.64	%		4.61	%		4.61	%		4.61	%
- Percentage of Shares (as a % of the total share capital of the Company)		3.51	%		3.51	%		3.51	%		3.51	%
b. Non-encumbered
- Number of Shares		205333215			207028873			207028873			207028873
- Percentage of Shares (as a % of the total shareholding of promoters and promoter group)		95.36	%		95.39	%		95.39	%		95.39	%
- Percentage of Shares (as a % of the total share capital of the Company)		72.05	%		72.64	%		72.64	%		72.64	%
3. Shares held by custodian and against which Depository Receipts have been issued-
(I) Promoters and promoters group		—			—			—			—
(II) Public		11468676			14167950			16582670			14167950

Particulars	Quarter ended on 30.06.2013
B) Investor complaints
Pending at the beginning of the quarter	Nil
Received during the quarter	2
Resolved during the quarter	2
Remaining unresolved at the end of the quarter	Nil

( in Lakhs)

B. STATEMENT OF CONSOLIDATED UNAUDITED FINANCIAL RESULTS FOR THE QUARTER ENDED JUNE 30, 2013

Part I

		Consolidated
	Particulars	For the quarter ended									For the year ended
		June 30 2013			March 31 2013			June 30 2012			March 31 2013
		(unaudited)			(audited) (Refer note  2)			(unaudited)			(audited)
1	Income from Operations		449798			440046			410739			1721295
2	Expenses
	a. Network Costs		246788			248925			226813			965633
	b. Employee benefits		60221			60486			60039			241146
	c. Depreciation and Amortization		50372			42728			52901			202705
	d. Other		77634			81981			70611			308545
	e. Total Expenditure (2a to 2d)		435015			434120			410364			1718029
3	Profit / (Loss) from Operations before Other Income, Finance costs and Exceptional Items (1 - 2)		14783			5926			375			3266
4	Other Income / (Expense), Net		2636			4137			11325			22659
5	Profit / (Loss) from Ordinary Activities before Finance costs and Exceptional Items (3 + 4)		17419			10063			11700			25925
6	Finance Costs		16629			18781			20628			79414
7	Profit / (Loss) from Ordinary Activities after Finance costs but before Exceptional Items (5 - 6)		790			(8718	)		(8928	)		(53489	)
8	Exceptional Items loss/(gain)		(21622	)		(18332	)		—			(10418	)
9	Profit / (Loss) from Ordinary Activities before Tax (7 - 8)		22412			9614			(8928	)		(43071	)
10	Tax Expense		12984			10808			5280			22020
11	Net Profit / (Loss) from Ordinary Activities after Tax (9 - 10)		9428			(1194	)		(14208	)		(65091	)
12	Extraordinary Items (net of Tax Expense)		—			—			—			—
13	Net Profit / (Loss) for the period (11 - 12)		9428			(1194	)		(14208	)		(65091	)
14	Share in Profit / (Loss) of Associates		75			37			12			25
15	Minority Interest		(51	)		637			(90	)		2735
16	Net Profit / (Loss) after taxes, minority interest and share of profit/(loss) of associates (13+14+15)		9452			(520	)		(14286	)		(62331	)

( in Lakhs)

B. STATEMENT OF CONSOLIDATED UNAUDITED FINANCIAL RESULTS FOR THE QUARTER ENDED JUNE 30, 2013

Part I

		Consolidated
	Particulars	For the quarter ended								For the year ended
		June 30 2013		March 31 2013			June 30 2012			March 31 2013
		(unaudited)		(audited) (Refer note  2)			(unaudited)			(audited)
17	Paid up Equity Share Capital (Face value of 10 per share)		28500		28500			28500			28500
18	Reserves excluding Revaluation Reserve										93340
19	Debenture Redemption Reserve										35013
20	Earnings Per Share (EPS)		3.32		(0.18	)		(5.01	)		(21.87	)
	Basic and diluted earnings per share before and after Extraordinary Items ( )

C. Standalone Business Segment Information:

( in Lakhs)

	Standalone
Particulars	For the quarter ended									For the year ended
	June 30 2013			March 31 2013			June 30 2012			March 31 2013
	(unaudited)			(audited) (Refer note 2)			(unaudited)			(audited)
Income from Operations
Global Voice Solutions		29856			31013			32157			119311
Global Data and Managed Services		84209			84010			76065			322301
Total		114065			115023			108222			441612
Segment result
Global Voice Solutions		(3604	)		(1357	)		(3638	)		(14423	)
Global Data and Managed Services		67306			67403			57531			251273
Total		63702			66046			53893			236850
Less :
(i) Finance Cost		1586			2158			3292			11969
(ii) Other Unallocable Expenses (net)		*27390			**27914			34242			***159212
Profit / (Loss) before Taxes		34726			35974			16359			65669

* Includes Exceptional Items (21622)

** Includes Exceptional Items (18336)

*** Includes Exceptional Items (15835)

D. Consolidated Business Segment Information:

( in Lakhs)

	Consolidated
Particulars	For the quarter ended									For the year ended
	June 30 2013			March 31 2013			June 30 2012			March 31 2013
	(unaudited)			(audited) (Refer note 2)			(unaudited)			(audited)
Income from Operations
Global Voice Solutions		222307			218818			204848			856469
Global Data and Managed Services		179577			174632			159796			675343
South Africa Operations		47739			46410			45860			188548
Others		175			186			235			935
Total		449798			440046			410739			1721295
Segment result
Global Voice Solutions		40569			37047			35952			140359
Global Data and Managed Services		115380			110541			107912			443630
South Africa Operations		5812			2172			729			5148
Others		(177	)		(2644	)		(369	)		(3544	)
Total		161584			147116			144224			585593
Less :
(i) Finance Costs		16629			18781			20628			79414
(ii) Other Unallocable Expenses (net)		*122543			**118721			132524			***549250
Profit / (Loss) before Taxes		22412			9614			(8928	)		(43071	)

* Includes Exceptional Items (21622)

** Includes Exceptional Items (18332)

*** Includes Exceptional Items (10418)

Notes to Segments:

The Company’s reportable business segments are Global Voice Solutions (GVS), Global Data and Managed Services (GDMS), South Africa Operations and others. The composition of the reportable segments is as follows:

GVS includes International and National Long Distance Voice services.

GDMS includes Corporate Data Transmission services, data center, virtual private network signalling and roaming services, television and other network and managed services.

South Africa Operations are carried out by the Company’s subsidiary Neotel Pty Ltd. and comprise wholesale international voice and data transit, enterprise business solution services for the wholesale and corporate market, telephony and data services for retail customers in South Africa.

Others primarily comprise a Joint venture business.

Revenues and interconnect charges are directly attributable to the segments. Space segment utilization charges, rent of landlines and other network and transmission costs are allocated based on utilization of satellite and landlines. License fee for GVS and GDMS have been allocated based on net adjusted gross revenues from these services. Segment result is segment revenues less segment expenses. Certain costs including depreciation which are not allocable to GVS and GDMS have been classified as “Other Unallocable Expenses (net)”.

Telecommunication services are provided utilizing the Company’s assets which do not generally make a distinction between the types of services. As a result, fixed assets are used interchangeably between segments. In the absence of a meaningful basis to allocate assets and liabilities between segments, no allocation has been made.

Notes:

1. The above Standalone and Consolidated results of the Company for the quarter ended June 30, 2013 have been subjected to limited review by the statutory auditors, recommended by the audit committee and were taken on record and approved by the Board of Directors at their meeting held on July 26, 2013.

2. The figures for the quarter ended March 31, 2013 are the balancing figures between the audited figures in respect of the full financial year ended March 31, 2013 and the published figures for the nine months ended December 31, 2012.

3. Other Income includes:

Foreign exchange fluctuation

( in Lakhs)

Net foreign exchange loss/(gain)	For the quarter ended									For the year ended
	June 30 2013			March 31 2013			June 30 2012			March 31 2013
	(unaudited)			(audited) (Refer note  2)			(unaudited)			(audited)
- Standalone		(1291	)		448			148			1543
- Consolidated		(1557	)		(1162	)		(1887	)		(1448	)

4. Results include exceptional items:

a. For the quarter ended June 30, 2013, Input credits against certain statutory obligations relating to earlier periods have been accounted for during the quarter on crystallization of the entitlements to such credits.

b. For the quarter and the financial year ended March 31, 2013, in respect of Standalone financials, Employee cost optimization expenses amounting to 626 lakhs and 3127 lakhs respectively and gain on sale of fixed asset of 18962 lakhs and in respect of Consolidated financials, employee cost optimization expenses amounting to 630 lakhs and 8544 lakhs respectively and gain on sale of fixed asset of 18962 lakhs.

5. During the year 2013, the Company has submitted to the Bombay and the National Stock Exchange the proposed “Scheme of Arrangement” between the Company and the S&A Internet Services Private Limited (“the Subsidiary Company”), for transfer of the IDC division (Colocation Service division of the Company) on going concern basis to the Subsidiary Company. The Scheme has been approved by the Board of Directors of the Company at its meeting held on March 1, 2013 and is subject to the approval of the shareholders and the Bombay High Court. The financial results do not include any adjustments that may arise on implementation of the Scheme

6. During the Quarter, the Company filed Form 25 with the U.S. Securities and Exchange Commission and consequent to the filing, the delisting of its American Depositary Shares (“ADRs”), as evidenced by American Depositary Receipts (“ADRs”), from the New York Stock Exchange has become effective at the close of business of June 7, 2013.

7. The previous period’s figures have been rearranged wherever necessary to make them comparable with the current period’s figures.

For TATA COMMUNICATIONS LIMITED

VINOD KUMAR

MANAGING DIRECTOR &

GROUP CEO

Place : Mumbai.

Date : July 26, 2013