Substantial Shareholders* % Held
Ameriprise Financial, Inc.  15.17
Teleios Capital Partners LLC  10.34
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
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 26 October 2018 Spirent had been notified of the following significant interest in its Ordinary Shares pursuant to Disclosure and Transparency Rule 5.