TR-1 announcement

RNS Number : 2350E

Helios Underwriting Plc

13 May 2026

TR-1: Standard form for notification of major holdings

NOTIFICATION OF MAJOR HOLDINGS (to be sent to the relevant issuer and to the FCA in Microsoft Word format if possible)ⁱ

1a. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attachedⁱⁱ:			HELIOS UNDERWRITING PLC
1b. Please indicate if the issuer is a non-UK issuer (please mark with an "X" if appropriate)
Non-UK issuer
2. Reason for the notification (please mark the appropriate box or boxes with an "X")
An acquisition or disposal of voting rights
An acquisition or disposal of financial instruments
An event changing the breakdown of voting rights
Other (please specify)ⁱⁱⁱ: Transaction in own shares						x
3. Details of person subject to the notification obligation^iv
Name			Polar Capital LLP
City and country of registered office (if applicable)			London, UK
4. Full name of shareholder(s) (if different from 3.)^v
Name
City and country of registered office (if applicable)
5. Date on which the threshold was crossed or reached^vi:			11/05/2026
6. Date on which issuer notified (DD/MM/YYYY):			12/05/2026
7. Total positions of person(s) subject to the notification obligation
	% of voting rights attached to shares (total of 8. A)	% of voting rights through financial instruments (total of 8.B 1 + 8.B 2)		Total of both in % (8.A + 8.B)	Total number of voting rights of issuer^vii
Resulting situation on the date on which threshold was crossed or reached	15.01%			15.01%	69,436,291
Position of previous notification (if applicable)	14.97%			14.97%

8. Notified details of the resulting situation on the date on which the threshold was crossed or reached^viii

A: Voting rights attached to shares

Class/type of
shares

ISIN code (if possible)

Number of voting rights^ix

% of voting rights

Direct

(Art 9 of Directive 2004/109/EC) (DTR5.1)

Indirect

(Art 10 of Directive 2004/109/EC) (DTR5.2.1)

Direct

(Art 9 of Directive 2004/109/EC) (DTR5.1)

Indirect

(Art 10 of Directive 2004/109/EC) (DTR5.2.1)

GB00B23XLS45

10,424,605

15.01%

SUBTOTAL 8. A

10,424,605

15.01%

B 1: Financial Instruments according to Art. 13(1)(a) of Directive 2004/109/EC (DTR5.3.1.1 (a))

Type of financial instrument

Expiration
date^x

Exercise/
Conversion Period^xi

Number of voting rights that may be acquired if the instrument is

exercised/converted.

% of voting rights

SUBTOTAL 8. B 1

B 2: Financial Instruments with similar economic effect according to Art. 13(1)(b) of Directive 2004/109/EC (DTR5.3.1.1 (b))

Type of financial instrument

Expiration
date^x

Exercise/
Conversion Period ^xi

Physical or cash

settlement^xii

Number of voting rights

% of voting rights

SUBTOTAL 8.B.2

9. Information in relation to the person subject to the notification obligation (please mark the

applicable box with an "X")

Person subject to the notification obligation is not controlled by any natural person or legal entity and does not control any other undertaking(s) holding directly or indirectly an interest in the (underlying) issuer^xiii

Full chain of controlled undertakings through which the voting rights and/or the
financial instruments are effectively held starting with the ultimate controlling natural person or legal entity^xiv (please add additional rows as necessary)

Name^xv

% of voting rights if it equals or is higher than the notifiable threshold

% of voting rights through financial instruments if it equals or is higher than the notifiable threshold

Total of both if it equals or is higher than the notifiable threshold

Polar Capital Holdings PLC

Polar Partners Limited

Polar Capital US Holdings Limited

Polar Capital (America) Corporation

Polar Capital Holdings LLC

Polar Capital LLP

15.01%

10. In case of proxy voting, please identify:

Name of the proxy holder

The number and % of voting rights held

The date until which the voting rights will be held

11. Additional information^xvi

Place of completion	London, UK
Date of completion	12/05/2026

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END

HOLDZGMKNFMGVZM

RNS Number : 2350E

Helios Underwriting Plc

13 May 2026

TR-1: Standard form for notification of major holdings

NOTIFICATION OF MAJOR HOLDINGS (to be sent to the relevant issuer and to the FCA in Microsoft Word format if possible)ⁱ

1a. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attachedⁱⁱ:			HELIOS UNDERWRITING PLC
1b. Please indicate if the issuer is a non-UK issuer (please mark with an "X" if appropriate)
Non-UK issuer
2. Reason for the notification (please mark the appropriate box or boxes with an "X")
An acquisition or disposal of voting rights
An acquisition or disposal of financial instruments
An event changing the breakdown of voting rights
Other (please specify)ⁱⁱⁱ: Transaction in own shares						x
3. Details of person subject to the notification obligation^iv
Name			Polar Capital LLP
City and country of registered office (if applicable)			London, UK
4. Full name of shareholder(s) (if different from 3.)^v
Name
City and country of registered office (if applicable)
5. Date on which the threshold was crossed or reached^vi:			11/05/2026
6. Date on which issuer notified (DD/MM/YYYY):			12/05/2026
7. Total positions of person(s) subject to the notification obligation
	% of voting rights attached to shares (total of 8. A)	% of voting rights through financial instruments (total of 8.B 1 + 8.B 2)		Total of both in % (8.A + 8.B)	Total number of voting rights of issuer^vii
Resulting situation on the date on which threshold was crossed or reached	15.01%			15.01%	69,436,291
Position of previous notification (if applicable)	14.97%			14.97%

8. Notified details of the resulting situation on the date on which the threshold was crossed or reached^viii

A: Voting rights attached to shares

Class/type of
shares

ISIN code (if possible)

Number of voting rights^ix

% of voting rights

Direct

(Art 9 of Directive 2004/109/EC) (DTR5.1)

Indirect

(Art 10 of Directive 2004/109/EC) (DTR5.2.1)

Direct

(Art 9 of Directive 2004/109/EC) (DTR5.1)

Indirect

(Art 10 of Directive 2004/109/EC) (DTR5.2.1)

GB00B23XLS45

10,424,605

15.01%

SUBTOTAL 8. A

10,424,605

15.01%

B 1: Financial Instruments according to Art. 13(1)(a) of Directive 2004/109/EC (DTR5.3.1.1 (a))

Type of financial instrument

Expiration
date^x

Exercise/
Conversion Period^xi

Number of voting rights that may be acquired if the instrument is

exercised/converted.

% of voting rights

SUBTOTAL 8. B 1

B 2: Financial Instruments with similar economic effect according to Art. 13(1)(b) of Directive 2004/109/EC (DTR5.3.1.1 (b))

Type of financial instrument

Expiration
date^x

Exercise/
Conversion Period ^xi

Physical or cash

settlement^xii

Number of voting rights

% of voting rights

SUBTOTAL 8.B.2

9. Information in relation to the person subject to the notification obligation (please mark the

applicable box with an "X")

Name^xv

% of voting rights if it equals or is higher than the notifiable threshold

% of voting rights through financial instruments if it equals or is higher than the notifiable threshold

Total of both if it equals or is higher than the notifiable threshold

Polar Capital Holdings PLC

Polar Partners Limited

Polar Capital US Holdings Limited

Polar Capital (America) Corporation

Polar Capital Holdings LLC

Polar Capital LLP

15.01%

10. In case of proxy voting, please identify:

Name of the proxy holder

The number and % of voting rights held

The date until which the voting rights will be held

11. Additional information^xvi

Place of completion	London, UK
Date of completion	12/05/2026

END

HOLDZGMKNFMGVZM

TIDM	HUW
Share Price	222.26p-0.22%
Market Cap	£169.00m

Date	14 May 2026
Time	07:00:01
Category	Holding(s) in company
ID	2350E

TIDM	HUW
Share Price	222.26p-0.22%
Market Cap	£169.00m

Date	14 May 2026
Time	07:00:01
Category	Holding(s) in company
ID	2350E

t

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TR-1 announcement

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