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Important Notice Regarding the Internet Availability of Proxy Materials for the Special Meeting ofDUDDELL STREET ACQUISITION CORP.To view the 2022 Proxy Statement and to attend the Special Meeting, please go to:https://www.cstproxy.com/dsac/2022 PROXY CARDTHE BOARD OF DIRECTORS RECOMMENDS A VOTE “FOR” PROPOSALS 1, 2, 3, 4, 5, 6, 7, 8 AND 9.Please markyour voteslike this 1. Proposal No. 1 — The Business Combination Proposal(conditioned on the approval and adoption of the otherCondition Precedent Proposals) — to consider and vote upon aproposal to approve and adopt, by way of ordinary resolution, the Agreement and Plan of Merger,dated as of November 7, 2021 (as may be amended, restated, supplemented or otherwise modifiedfrom time to time, including by the First Amendment to Agreement and Plan of Merger, dated May9, 2022, and the Second Amendment to Agreement and Plan of Merger, dated June [21], 2022 the “Business Combination Agreement”), by and among DSAC, Grassroots Merger Sub,Inc., a Delaware corporation and a wholly owned subsidiary of DSAC (“Merger Sub”), and Fiscal-Note Holdings, Inc., a Delaware corporation (“FiscalNote”), pursuant to which, among other things,DSAC will be domesticated as a Delaware corporation and, promptly thereafter, Merger Sub willmerge with and into FiscalNote, with FiscalNote surviving the merger as a wholly owned subsidiaryof DSAC (the transactions contemplated by the Business Combination Agreement, the “BusinessCombination” and such proposal, the “Business Combination Proposal”). “New FiscalNote” refers toDSAC after consummation of the Business Combination.2. Proposal No. 2 — The Domestication Proposal (conditionedon the approval and adoption of the other Condition PrecedentProposals) — to consider and vote upon a proposal to approve, byway of special resolution in accordance with Article 185 of DSAC’s amended and restated articlesof association, assuming the Business Combination Proposal is approved and adopted, the transferof DSAC by way of continuation to Delaware pursuant to Part XII of the Companies Act (Revised) ofthe Cayman Islands and Section 388 of the General Corporation Law of the State of Delaware (the“DGCL”) and, immediately upon being de-registered in the Cayman Islands, continuing and domesticatingas a corporation incorporated under the laws of the State of Delaware.3. Proposal No. 3 — The Governing Documents Proposal(conditioned on the approval of the other Condition PrecedentProposals) — to consider and vote upon a proposal to approve andadopt, by way of special resolution, assuming the Business Combination Proposal and the DomesticationProposal are approved and adopted, the proposed certificate of incorporation of DSAC (the“Proposed Charter”) and the proposed bylaws of DSAC (the “Proposed Bylaws”), copies of whichare attached to the proxy statement/prospectus delivered to DSAC’s shareholders in connectionwith the special meeting as Annexes B and C, respectively, which together will replace DSAC’samended and restated memorandum and articles of association, dated October 22, 2020 (the “CurrentCharter”), and will become effective upon the completion of the Domestication in connectionwith the closing of the Business Combination (the “Closing”).4. Proposal No. 4 — The Advisory Governing Documents Proposals (not conditioned on theapproval and adoption of any of the Condition Precedent Proposals) —to consider and voteupon separate proposals to approve by way of a special resolution, on a non-binding advisory basis,the following material differences between the Proposed Charter and Proposed Bylaws and theCurrent Charter, which are being presented in accordance with the requirements of the Securitiesand Exchange Commission as six separate sub-proposals:i. Advisory Governing Documents Proposal A —Under the Proposed Charter, New FiscalNote will be authorizedto issue 1,809,000,000 shares of capital stock, consistingof (i) 1,709,000,000 shares of common stock, including 1,700,000,000 shares of New Fiscal-Note Class A common stock, par value $0.0001 per share (“New FiscalNote Class A commonstock”), 9,000,000 shares of New FiscalNote Class B common stock, par value $0.0001 per share(“New FiscalNote Class B common stock”), and (ii) 100,000,000 shares of preferred stock, parvalue $0.0001 per share, as opposed to the Current Charter, which authorizes DSAC to issue201,000,000 capital shares, consisting of (i) 200,000,000 ordinary shares, including 180,000,000DSAC Class A ordinary shares, par value $0.0001 per share, and 20,000,000 DSAC Class Bordinary shares, par value $0.0001 per share, and (ii) 1,000,000 preference shares, par value$0.0001 per share;ii. Advisory Governing Documents Proposal B —Holders of shares of New FiscalNote Class A common stock willbe entitled to cast one vote per share of New FiscalNote Class Acommon stock on each matter properly submitted to New FiscalNote’s stockholders entitled tovote, and holders of shares of New FiscalNote Class B common stock will be entitled to cast 25votes per share of New FiscalNote Class B common stock on each matter properly submitted toNew FiscalNote’s stockholders entitled to vote, except as otherwise expressly provided in theProposed Charter or required by applicable law, as opposed to each DSAC Class A ordinary shareand DSAC Class B ordinary share being entitled to one vote per share on each matter properlysubmitted to DSAC’s shareholders entitled to vote;iii. Advisory Governing Documents Proposal C —Subject to the rights of holders of any series of preferred stock toelect directors, the number of directors constituting the New FiscalNoteboard of directors (the “New FiscalNote Board”) shall be fixed from time to time by theNew FiscalNote Board; provided, that unless otherwise approved by the Requisite StockholderConsent, the number of the directors shall be no less than five (5) and shall not exceed twelve(12). “Requisite Stockholder Consent” means (i) prior to the Voting Threshold Date, the consent ofthe holders of a majority in voting power of the shares of capital stock of New FiscalNote entitledto vote, and (ii) on and after the Voting Threshold Date, the consent of the holders of two-thirds(2/3) of the voting power of the shares of capital stock of New FiscalNote then entitled to vote.“Voting Threshold Date” means the first date on which the issued and outstanding shares of NewFiscalNote Class B common stock represents less than 50% of the total voting power of the thenoutstanding shares of capital stock of New FiscalNote entitled to vote;iv. Advisory Governing Documents Proposal D —(i) The number of authorized shares of New FiscalNote Class Acommon stock and New FiscalNote Class B common stock maybe increased by the affirmative vote of the holders of shares representing a majority of the votingpower of all of the outstanding shares of capital stock of New FiscalNote entitled to vote thereon,irrespective of the provisions of Section 242(b)(2) of the DGCL (or any successor provisionthereto), (ii) the number of authorized shares of New FiscalNote Class A common stock or NewFiscalNote preferred stock may be decreased (but not below the number of shares thereof thenoutstanding or, in the case of the New FiscalNote Class A common stock, the number of sharesof New FiscalNote Class A common stock reserved for issuance upon the conversion of sharesof New FiscalNote Class B common stock) by the affirmative vote of the holders of shares representinga majority of the voting power of all of the outstanding shares of capital stock of NewFiscalNote entitled to vote thereon, irrespective of the provisions of Section 242(b)(2) of the DGCL(or any successor provision thereto), and (iii) the number of authorized shares of New FiscalNoteClass B common stock may be decreased (but not below the number of shares thereof then outstanding)by the affirmative vote of a majority of the voting power of all of the outstanding sharesof New FiscalNote Class B common stock, as opposed to DSAC requiring an increase in sharecapital by ordinary resolution; and;v. Advisory Governing Documents Proposal E — Authorizationof all other changes in the Proposed Charter and the ProposedBylaws, including (1) adopting Delaware as the exclusive forum forcertain stockholder litigation and the federal district courts of the United States as the exclusiveforum for certain other stockholder litigation, in each case unless New FiscalNote expressly consentsin writing to the selection of an alternative forum and (2) removing certain provisions relatedto DSAC’s status as a blank check company that will no longer be applicable upon consummationof the Business Combination;vi. Advisory Governing Documents Proposal F — Authorizationof an amendment to the Proposed Charter in order to change thecorporate name of “Duddell Street Acquisition Corp.” to “FiscalNoteHoldings, Inc.” in connection with the consummation of the Business Combination.5. Proposal No. 5 — The Director Election Proposal (conditioned on the approval andadoption of the other Condition Precedent Proposals) — to consider and vote upon a proposalto approve, by way of ordinary resolution, assuming the Business Combination Proposal, theDomestication Proposal and the Governing Documents Proposal are approved and adopted, theelection of 10 directors who, upon consummation of the Business Combination, will constitute 10out of 11 members of the board of directors of New FiscalNote, each to serve for a term as set forthunder the Proposed Charter or until such director’s earlier death, resignation, retirement, or removal,provided, however, that the election of Mr. Manoj Jain, is subject to prior CFIUS approval.Tim HwangGerald YaoMichael CallahanKey ComptonStanley McChrystalKeith NilssonAnna SedgleyBrandon SweeneyConrad YiuManoj Jain*Instruction: To withhold authority to vote for any individual nominee, mark the “Forall Except” Box and strike a line through that nominee’s name in the list.6. Proposal No. 6 — The Stock Issuance Proposal (conditionedon the approval and adoption of the other Condition PrecedentProposals) — to consider and vote upon a proposal to approve, byway of ordinary resolution, assuming the Business Combination Proposal, the Domestication Proposal,the Governing Documents Proposal and the election of each director nominee pursuant tothe Director Election Proposal are approved and adopted, for the purposes of complying with theapplicable listing rules of Nasdaq, the issuance of (x) shares of New FiscalNote Class A commonstock pursuant to the terms of the Business Combination Agreement, and (y) shares of DSAC ClassA common stock to be issued pursuant to the Backstop Agreement (as defined in the proxy statement/prospectus), plus any additional shares pursuant to subscription agreements we may enterinto prior to Closing.7. Proposal No. 7 — The Long-Term Incentive Award PlanProposal (conditioned on the approval and adoption of the otherCondition Precedent Proposals) — to consider and vote upon aproposal to approve by way of ordinary resolution, assuming the Business Combination Proposal,the Domestication Proposal, the Governing Documents Proposal, the election of each director nomineepursuant to the Director Election Proposal and the Stock Issuance Proposal are approved andadopted, the 2022 Long-Term Incentive Award Plan (the “2022 Plan”), a copy of which is attached tothe proxy statement/prospectus as Annex E, including the authorization of the initial share reserveunder the 2022 Plan.8. Proposal No. 8 — The ESPP Proposal (conditioned onthe approval and adoption of the other Condition PrecedentProposals) — to consider and vote upon a proposal to approve byway of ordinary resolution, assuming the Business Combination Proposal, the Domestication Proposal,the Governing Documents Proposal, the election of each director nominee pursuant to theDirector Election Proposal, the Stock Issuance Proposal and the Long-Term Incentive Award PlanProposal are approved and adopted, the Employee Stock Purchase Plan (the “ESPP”), a copy ofwhich is attached to the proxy statement/prospectus as Annex F, including the authorization of theinitial share reserve under the ESPP.9. Proposal No. 9 — The Adjournment Proposal (not conditionedon the approval of any other proposal) — to consider and voteupon a proposal to approve by way of ordinary resolution the adjournmentof the Special Meeting to a later date or dates, if necessary, to permit further solicitationand vote of proxies if, based upon the tabulated vote at the time of the Special Meeting, any of theBusiness Combination Proposal, the Domestication Proposal, the Governing Documents Proposal,the election of any director nominee pursuant to the Director Election Proposal, the Stock IssuanceProposal, the Long-Term Incentive Award Plan Proposal and the ESPP Proposal (together, the“Condition Precedent Proposals”) would not be duly approved and adopted by our shareholders orwe determine that one or more of the Closing conditions under the Business Combination Agreementis not satisfied or waived.20071 Duddell Street Acquisition Corp.REV3 Proxy Card BackSignature_________________________________Signature, if held jointly_______________________________ Date_____________, 2022Note: Please sign exactly as name appears hereon. When shares are held by joint owners, both should sign. When signing as attorney, executor, administrator, trustee,guardian, or corporate officer, please give title as such. If signing as a corporation or partnership, please sign in full corporate or partnership name by authorized officer. Vote FOR allnomineesVote WITHHOLDfor all nomineesVote FOR allnominees except* FOR AGAINST ABSTAIN