ABC.L Regulatory News (ABC)

(a) Name of exempt principal trader:

J.P. Morgan Securities Plc

(b) Name of offeror/offeree in relation to whose relevant securities this form relates:

Use a separate form for each offeror/offeree

Abcam plc

(c) Name of the party to the offer with which exempt principal trader is connected:

Corporate Broker and Financial Advisor to Abcam plc

(d) Date dealing undertaken:

02 May 2018

(e) In addition to the company in 1(b) above, is the exempt principal trader making disclosures in respect of any other party to this offer?

If it is a cash offer or possible cash offer, state "N/A"

Yes, Horizon Discovery Group plc

Class of relevant security

Purchases/ sales

Total number of securities

Highest price per unit paid/received (GBP)

Lowest price per unit paid/received (GBP)

Ordinary Shares

Purchases

Sales

34,360

47,390

12.5451

12.5400

12.1500

12.1900

Class of relevant security

Product description

e.g. CFD

Nature of dealing

e.g. opening/closing a long/short position, increasing/reducing a long/short position

Number of reference securities

Price per unit

(GBP)

Ordinary Shares

Equity Swaps

Long

Short

1,759

 120

 243

 67

 2,059

 2,900

 156

 9,885

 17,020

500

 264

 35

 181

 460

 528

 3,095

 1,136

 859

 168

 8

 10,399

 2,385

 731

 2,457

 1,395

 243

12.3020

12.3197

12.3493

12.3599

12.4231

12.4314

12.4634

12.4790

12.4800

12.1503

12.2804

12.2826

12.2859

12.2875

12.2904

12.3399

12.3441

12.3541

12.3600

12.3719

12.3773

12.3872

12.3977

12.4776

12.4800

12.4806

Class of relevant security

Product description e.g. call option

Writing, purchasing, selling, varying etc.

Number of securities to which option relates

Exercise price per unit

(GBP)

Type

e.g. American, European etc.

Expiry date

Option money paid/ received per unit (GBP)

Class of relevant security

Product description

e.g. call option

Exercising/ exercised against

Number of securities

Exercise price per unit

(GBP)

Class of relevant security

Nature of dealing

e.g. subscription, conversion

Details

Price per unit (if applicable)

(GBP)

Details of any indemnity or option arrangement, or any agreement or understanding, formal or informal, relating to relevant securities which may be an inducement to deal or refrain from dealing entered into by the exempt principal trader making the disclosure and any party to the offer or any person acting in concert with a party to the offer:

Irrevocable commitments and letters of intent should not be included. If there are no such agreements, arrangements or understandings, state "none"

None

Details of any agreement, arrangement or understanding, formal or informal, between the exempt principal trader making the disclosure and any other person relating to:

(i) the voting rights of any relevant securities under any option; or

(ii) the voting rights or future acquisition or disposal of any relevant securities to which any derivative is referenced:

If there are no such agreements, arrangements or understandings, state "none"

None

03 May 2018

Alwyn Basch

020 7742 7407