Hundreds of mourners gathered to pay tribute to six men who were all employed by the same technology firm, Cellulant.
The company has praised their selflessness and bravery.
Somalia-based Islamist group al-Shabab said it carried out the attack.
Five militants, including a suicide bomber, stormed the luxury Dusit complex in the Westland's district of the capital last Tuesday, killing at least 21 people and injuring dozens.
Elite police officers ended a 19-hour siege after killing all the attackers.
