Helicos BioSciences Corporation (HLCS) President and CEO to Ring the NASDAQ Stock Market Closing Bell


ADVISORY, June 29, 2007 (PRIME NEWSWIRE) --



 What:
 Stanley N. Lapidus, President and CEO of Helicos BioSciences
 Corporation (HLCS), will preside over the closing bell.

 Where:
 NASDAQ MarketSite - 4 Times Square - 43rd & Broadway - Broadcast Studio

 When:
 Monday, July 2, 2007 at 4 p.m. ET

 Contacts:
 Sally Bain
 Racepoint Group, Inc.
 781-487-4647; sbain@racepointgroup.com

 NASDAQ MarketSite:
 Jolene Libretto; 646.441.5220; 347.219.9539
 Jolene.Libretto@NASDAQ.com

Feed Information:

The closing bell is available from 3:50 p.m. to 4:05 p.m. on uplink IA-6 C-band/transponder 17. The downlink frequency is 4040 Vertical; Audio 6.2-6.8. The feed can also be found on Waterfront fiber 1623. If you have any questions, please contact Jolene Libretto at (646) 441-5220.

Radio Feed:

An audio transmission of the closing bell is also available from 3:50 p.m. to 4:05 p.m. on uplink IA6 C band / transponder 24, downlink frequency 4180 horizontal. The feed can be found on Waterfront fiber 1623 as well.

Webcast:

A live Webcast of the NASDAQ Closing Bell will be available at: http://www.nasdaq.com/reference/marketsite_about.stm

Photos:

To obtain a hi-resolution photograph of the Market Close, please go to http://www.nasdaq.com/reference/marketsite_events.stm and click on the market close of your choice.

About Helicos BioSciences (HLCS):

Helicos BioSciences Corporation is a life sciences company developing innovative genetic analysis technologies for the research, drug discovery and clinical diagnostics markets. The company has developed its proprietary True Single Molecule Sequencing technology to enable ultra-high-throughput genetic analysis based on the direct sequencing of single molecules of nucleic acids. The company's corporate headquarters are located at One Kendall Square, Building 700, Cambridge, MA 02139, and its telephone number is (617) 264-1800.