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LONDON--(BUSINESS WIRE)-- FORM 8.3 PUBLIC OPENING POSITION DISCLOSURE/DEALING DISCLOSURE BY A PERSON WITH INTERESTS IN RELEVANT SECURITIES REPRESENTING 1% OR MORE Rule 8.3 of the Takeover Code (the Code) 1. KEY INFORMATION Barclays PLC. SIGNATURE AVIATION PLC 23 March 2021 NO 2. POSITIONS OF THE PERSON MAKING THE DISCLOSURE If there are positions or rights to subscribe to disclose in more than one class of relevant securities of the offeror or offeree named in 1(c), copy table 2(a) or (b) (as appropriate) for each additional class of relevant security. (a) Interests and short positions in the relevant securities of the offeror or offeree to which the disclosure relates following the dealing (if any) Interests Short Positions Number (%) Number (%) (1) 32,630,939 3.94% 12,916,040 1.56% (2) 11,520,080 1.39% 29,850,689 3.60% (3) 0 0.00% 0 0.00% 44,151,019 5.33% 42,766,729 5.16% All interests and all short positions should be disclosed. Details of any open stock-settled derivative positions (including traded options), or agreements to purchase or sell relevant securities, should be given on a Supplemental Form 8 (Open Positions). (b) Rights to subscribe for new securities (including directors and other employee options) Class of relevant security in relation to which subscription right exists: Details, including nature of the rights concerned and relevant percentages: 3. DEALINGS (IF ANY) BY THE PERSON MAKING THE DISCLOSURE Where there have been dealings in more than one class of relevant securities of the offeror or offeree named in 1(c), copy table 3(a), (b), (c) or (d) (as appropriate) for each additional class of relevant security dealt in. The currency of all prices and other monetary amounts should be stated. (a) Purchases and sales Class of relevant Purchase/sale Number of Price per unit security securities 37p ordinary Purchase 68 4.0180 GBP 37p ordinary Purchase 206 4.0432 GBP 37p ordinary Purchase 360 4.0393 GBP 37p ordinary Purchase 2,482 4.0317 GBP 37p ordinary Purchase 3,441 4.0352 GBP 37p ordinary Purchase 3,909 4.0369 GBP 37p ordinary Purchase 8,887 4.0458 GBP 37p ordinary Purchase 23,438 4.0450 GBP 37p ordinary Purchase 26,222 4.0250 GBP 37p ordinary Purchase 29,460 4.0310 GBP 37p ordinary Purchase 84,282 4.0390 GBP 37p ordinary Purchase 1,971,850 4.0360 GBP 37p ordinary Sale 264 4.0383 GBP 37p ordinary Sale 860 4.0441 GBP 37p ordinary Sale 990 4.0430 GBP 37p ordinary Sale 1,257 4.0501 GBP 37p ordinary Sale 1,510 4.0509 GBP 37p ordinary Sale 2,139 4.0484 GBP 37p ordinary Sale 2,688 4.0344 GBP 37p ordinary Sale 2,829 4.0314 GBP 37p ordinary Sale 4,112 4.0496 GBP 37p ordinary Sale 4,720 4.0406 GBP 37p ordinary Sale 6,031 4.0502 GBP 37p ordinary Sale 7,960 4.0520 GBP 37p ordinary Sale 10,049 4.0463 GBP 37p ordinary Sale 10,980 4.0436 GBP 37p ordinary Sale 11,274 4.0380 GBP 37p ordinary Sale 12,322 4.0426 GBP 37p ordinary Sale 14,878 4.0427 GBP 37p ordinary Sale 16,695 4.0329 GBP 37p ordinary Sale 23,041 4.0370 GBP 37p ordinary Sale 23,613 4.0348 GBP 37p ordinary Sale 24,208 4.0534 GBP 37p ordinary Sale 26,258 4.0469 GBP 37p ordinary Sale 29,892 4.0324 GBP 37p ordinary Sale 30,028 4.0313 GBP 37p ordinary Sale 32,038 4.0276 GBP 37p ordinary Sale 36,980 4.0387 GBP 37p ordinary Sale 53,020 4.0274 GBP 37p ordinary Sale 55,832 4.0288 GBP 37p ordinary Sale 60,703 4.0332 GBP 37p ordinary Sale 62,192 4.0459 GBP 37p ordinary Sale 136,948 4.0299 GBP 37p ordinary Sale 144,039 4.0292 GBP 37p ordinary Sale 162,641 4.0510 GBP 37p ordinary Sale 215,288 4.0409 GBP 37p ordinary Sale 260,176 4.0461 GBP 37p ordinary Sale 1,000,000 4.0405 GBP 37p ordinary Sale 1,000,040 4.0460 GBP (b) Cash-settled derivative transactions Class of Product Nature of dealing Number of Price per relevant description reference unit security securities 37p ordinary SWAP Long 43,917 4.0431 GBP 37p ordinary SWAP Long 49,593 4.0411 GBP 37p ordinary SWAP Long 77,194 4.0461 GBP 37p ordinary SWAP Long 114,902 4.0407 GBP 37p ordinary SWAP Long 168,707 4.0463 GBP 37p ordinary SWAP Short 1,490 4.0374 GBP 37p ordinary CFD Short 2,033 4.0275 GBP 37p ordinary SWAP Short 40,906 4.0460 GBP 37p ordinary SWAP Short 49,685 4.0330 GBP (c) Stock-settled derivative transactions (including options) (i) Writing, selling, purchasing or varying 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 Type e.g. American, European etc. Expiry date Option money paid/ received per unit (ii) Exercise Class of relevant security Product description e.g. call option Exercising/ exercised against Number of securities Exercise price per unit (d) Other dealings (including subscribing for new securities) Class of relevant security Nature of dealing e.g. subscription, conversion Details Price per unit (if applicable) 4. OTHER INFORMATION (a) Indemnity and other dealing arrangements 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 person 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 (b) Agreements, arrangements or understandings relating to options or derivatives Details of any agreement, arrangement or understanding, formal or informal, between the person 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 (c) Attachments 24 Mar 2021 Large Holdings Regulatory Operations 020 3134 7213 Public disclosures under Rule 8 of the Code must be made to a Regulatory Information Service. The Panels Market Surveillance Unit is available for consultation in relation to the Codes disclosure requirements on +44 (0)20 7638 0129. *If the discloser is a natural person, a telephone number does not need to be included, provided contact information has been provided to the Panels Market Surveillance Unit. The Code can be viewed on the Panels website at www.thetakeoverpanel.org.uk.

Answer: Form 8.3 - SIGNATURE AVIATION PLC