| 1949 | OTE founded |
| April 1996 | OTE is listed on the Athens stock Exchange (IPO) |
| May 1996 | OTEnet, our leading Ιnternet Service Provider (ISP), is established |
| October 1996 | COSMOTE, our leading mobile telephony operator, is created |
| June 1997 | OTE acquires a 20% stake in Telekom Srbija, the incumbent telephony company in Serbia |
| March 1998 | |
| November 1998 | OTE is listed on the New York Stock Exchange (NYSE) |
| December 1998 | OTE acquires an initial 35 % stake in RomTelecom, the incumbent telephony company in Romania |
| August 2000 | Cosmote acquires Albanian Mobile Company (AMC) |
| December 2000 | OTE acquires a GSM License in Bulgaria and establishes Globul to exploit this license |
| January 2003 | OTE raises its stake in RomTelecom to 54% |
| June 2003 | OTE launches ADSL services in the Greek market |
| July 2003 | Globul commences commercial operations |
| August 2004 | OTE and COSMOTE act as Grand National Sponsors of the Athens 2004 Olympic Games |
| April 2005 | OTE and Cosmote agree to the transfer of Globul (Bulgaria) and Cosmofon (FYROM) to Cosmote |
| May 2005 | Cosmote, Romtelecom and Cosmorom agree to Cosmote’s participation in Cosmorom’s share capital increase and re-launch |
| May 2005 | OTE reaches agreement with the Unions on the Voluntary Retirement Plan |
| August 2005 | OTE completes the transfer of its interests in GloBul (Bulgaria) and its interest in CosmoFon (FYROM) to Cosmote . Cosmote completed the € 120 million share capital contribution to CosmoRom – recently renamed Cosmote Romania-, thereby gaining a 70% equity stake in the Romanian mobile telephony operator, and initiated the process of relaunching its operations. |
| October 2005 | OTE announces a strong voluntary retirement take up. Out of a final pool of 6,000 eligible OTE fixed-line employees, more than 5,500 elected to apply for early retirement. |
| December 2005 | Cosmote Romania launches commercial operations. |
| April 2006 | OTE purchases in the open market 9.5 million shares of its subsidiary Cosmote S.A., increasing its interest from 64.1% to 67%. |
| April 2006 | OTE examines options for the disposal of its 90% stake in Armentel, the incumbent operator in Armenia |
| May 2006 | Cosmote, announces that it has reached an agreement regarding the purchase of a 42% interest in Germanos S.A., subject to regulatory approval |
| August 2006 | Cosmote receives the approval from EETT for the acquisition of GERMANOS S.A. |
| October 2006 | |
| November 2006 | |
| February 2007 | |
| June 2007 | The Hellenic Republic announces the successful completion of the sale of 10.7% interest in OTE’s share capital via an accelerated book build |
| August 2007 | |
| September 2007 | |
| November 2007 | OTE announces the Voluntary Tender Offer for the acquisition of all common registered shares of Cosmote |
| December 2007 | OTE announces the finalization of the sale of INFOTE, its classified Directory Inquirement Subsidiary |
| January 2008 | OTE issues €2.1 billion in fixed coupon bonds |
| February 2008 | |
| April 2008 | OTE announces that OTEestate filed a request for a license for the operation of a real estate investment company |
| May 2008 | Acquisition of the 100% of VOICENET by OTENET |
| June 2008 | |
| July 2008 | |
| September 2008 | OTE’s 100% subsidiary, Cosmote, appoints N M ROTHSCHILD & Sons Ltd and EFG TELESIS FINANCE ΑΕΠΕΥ as financial advisors for the sale of its subsidiary COSMOFON MOBILE TELECOMMUNICATIONS AD SKOPJE in FYROM |
| October 2008 | |
| November 2008 | DEUTSCHE TELEKOM AG’s participation in OTE SA’s share capital and total voting rights, stands at 25.0000004%, which corresponds to 122,537,599 shares andcorresponding voting rights. |
| January 2009 | OTE’s manangement and OME-OTE signed a collective Labor Agreement providing benefits for early retirement of employees |
| February 2009 | Cosmote acquired a further 12.6% of AMC |
| March 2009 | Cosmote signs agreement for the sale of Cosmofon in FYROM. |
| April 2009 | Cosmote completes the acquisition of a 12.6% stake in AMC. |
| May 2009 | |
| July 2009 | Cosmote signed a share purchase agreement for the acquisition of Telemobil S.A, (Zapp) in Romania. |
| October 2009 | Completion of the Voluntary Retirement Program of 2005-2006 |
| January 2010 | Set up of a new position in OTE Group, that of ‘OTE Group Chief Compliance Officer’ .mr Aristodimos Dimitriadis takes over on January 18th ,2010 |
| February 2010 | OTE’s Board of Directors elected Mr Rainer Rathgeber as a new member in replacement of mr. Hamid Akhavan who submitted in resignation. |


