SPIRENT COMMUNICATIONS PLC

Capital Markets Day 2020

London, UK - 8 October 2020: Spirent Communications plc ("Spirent" or the "Company") (LSE: SPT), a leading communications technology company, is hosting a virtual Capital Markets Day for investors and analysts this afternoon.

Via a virtual series of presentations, the session will provide greater context to Spirent's story and strategy in action demonstrating its growth initiatives and how it is set to make the most of the market opportunities ahead of it.

In addition to hearing from Eric Updyke, CEO and Paula Bell, CFO, today's Capital Markets Event will feature presentations from senior members of the executive team including Abhitesh Kastuar (GM Cloud & IP), Doug Roberts (GM Lifecycle Service Assurance) and Manuel Zepeda (EVP Global Sales & Services). No new material information will be disclosed and the Company will not be commenting on current trading.

A recording of the presentation will be available following the event in the Investors section of the Spirent Communications plc website https://corporate.spirent.com/.

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About Spirent Communications plc

Spirent Communications plc (LSE: SPT) offers test, measurement, analytics and assurance solutions for next-generation devices and networks. Spirent provides products, services and information solutions for high-speed Ethernet, positioning, and network infrastructure markets, with expanding focus on service assurance, cybersecurity and 5G. Spirent is accelerating the transition of connected devices, network equipment and applications from development labs to the operational network, as it continues to innovate toward fully-automated testing and autonomous service assurance solutions. Further information about Spirent Communications plc can be found at https://corporate.spirent.com/.

Spirent Communications plc Ordinary Shares are traded on the London Stock Exchange (ticker: SPT; LEI: 213800HKCUNWP1916L38). The Company operates a Level 1 American Depositary Receipt (ADR) programme with each ADR representing four Spirent Communications plc Ordinary Shares. The ADRs trade in the US over-the-counter (OTC) market under the symbol SPMYY and the CUSIP number is 84856M209. Spirent ADRs are quoted on the Pink OTC Markets electronic quotation service which can be found at http://www.otcmarkets.com/marketplaces/otc-pink.

Spirent and the Spirent logo are trademarks or registered trademarks of Spirent Communications plc. All other trademarks or registered trademarks mentioned herein are held by their respective companies. All rights reserved.

Spirent Communications plc

Origin One, 108 High Street, Crawley, West Sussex RH10 1BD, United Kingdom Tel +44 (0)1293 767676 | Fax +44 (0)1293 767677 | www.spirent.com Registered in England Number 470893 | Registered at the above address