Substantial Shareholders* % Held
Ameriprise Financial, Inc.  15.17
Prudential plc 9.77
AXA Investment Managers SA 7.77
Standard Life Investments Ltd 5.29
PrimeStone Capital LLP  5.10
Aberforth Partners  5.07
Teleios Capital Partners LLC  5.04
Brandes Investment Partners (various clients) 5.00
Neptune Investment Management Ltd  4.86
Artemis Investment Management Limited 4.77
Schroders plc  4.41
Sun Life Assurance Company of Canada (UK) Ltd 3.82
Kames Capital  3.03


*At 24 July 2018 Spirent had been notified of the following significant interest in its Ordinary Shares pursuant to Disclosure and Transparency Rule 5.