- ATHS — Athene Holding Ltd. 7.250% Fixe
- ATHX — Athersys, Inc.
- ATI — ATI Inc.
- ATIF — ATIF Holdings Ltd.
- ATII — Archimedes Tech SPAC Partners II Co. Ordinary Shares
- ATIIU — Archimedes Tech SPAC Partners II Co. Unit
- ATIIW — Archimedes Tech SPAC Partners II Co. Warrant
- ATKR — Atkore Inc.
- ATLC — Atlanticus Holdings Corporation
- ATLCL — Atlanticus Holdings Corporation 6.125% Senior Notes due 2026
- ATLCP — Atlanticus Holdings Corporation
- ATLCZ — Atlanticus Holdings Corporation 9.25% Senior Notes due 2029
- ATLN — Atlantic International Corp.
- ATLO — Ames National Corporation
- ATLX — Atlas Lithium Corporation
- ATLY.V — Altaley Mining Corporation
- ATMC — AlphaTime Acquisition Corp
- ATMCR — AlphaTime Acquisition Corp Right
- ATMCU — AlphaTime Acquisition Corp
- ATMCW — AlphaTime Acquisition Corp
- ATMD.TO — BetaPro Equal Weight Canadian Bank 2x Daily Bear ETF
- ATML — Atmel Corp.
- ATMR — Altimar Acquisition Corp. II
- ATMU — Atmus Filtration Technologies Inc.
- ATMU.TO — BetaPro Equal Weight Canadian Bank 2x Daily Bull ETF
- ATMV — AlphaVest Acquisition Corp
- ATMVR — AlphaVest Acquisition Corp
- ATMVU — AlphaVest Acquisition Corp Unit
- ATNF — ETHZilla Corporation Common Stock
- ATNFW — ETHZilla Corporation Warrant
- ATNI — ATN International, Inc.
- ATNM — Actinium Pharmaceuticals, Inc.
- ATNX — Athenex, Inc.
- ATO — Atmos Energy Corporation
- ATOAX — Aberdeen Ultra Short Municipal Income Fund - Class A
- ATOM — Atomera Incorporated
- ATON — AlphaTON Capital Corp.
- ATOS — Atossa Therapeutics, Inc.
- ATPC — Agape ATP Corporation
- ATR — AptarGroup, Inc.
- ATRA — Atara Biotherapeutics, Inc.
- ATRC — AtriCure, Inc.
- ATRI — Atrion Corporation
- ATRL.TO — AtkinsRéalis Group Inc.
- ATRO — Astronics Corporation
- ATRS — Antares Pharma, Inc.
- ATS — ATS Corporation
- ATS.TO — ATS Corporation
- ATSG — Air Transport Services Group, Inc.
- ATSI — ATS Medical, Inc.
- ATSMX — AQR TM Small Cap Momentum Style Fund Class I
- ATSPT — Archimedes Tech SPAC Partners Co.
- ATSPU — Archimedes Tech SPAC Partners Co.
- ATSPW — Archimedes Tech SPAC Partners Co.
- ATSX.TO — Accelerate Enhanced Canadian Benchmark Alternative Fund
- ATTO — Atento S.A.
- ATUS — Altice USA, Inc.
- ATVC — Tribe Capital Growth Corp I
- ATVCU — Tribe Capital Growth Corp I
- ATVCW — Tribe Capital Growth Corp I
- ATVI — Activision Blizzard, Inc.
- ATW — Atwood Oceanics Inc.
- ATW.V — ATW Tech Inc.
- ATX.TO — ATEX Resources Inc.
- ATX.V — ATEX Resources Inc.
- ATXG — Addentax Group Corp.
- ATXS — Astria Therapeutics, Inc.
- ATY — AcuityAds Holdings Inc.
- ATY.V — Atico Mining Corporation
- ATYR — aTyr Pharma, Inc.
- ATZ.TO — Aritzia Inc.
- AU — AngloGold Ashanti Plc
- AU.V — Aurion Resources Ltd.
- AUAU — Global X - Gold Miners ETF
- AUAU.V — A2 Gold Corp.
- AUB — Atlantic Union Bankshares Corporation
- AUBAP — Atlantic Union Bankshares Corporation
- AUBN — Auburn National Bancorporation, Inc.
- AUC — ATIF Holdings Limited Ordinary Shares
- AUD — Audacy, Inc.
- AUDC — AudioCodes Ltd.
- AUEIX — AQR Large Cap Defensive Style Fund
- AUEN.V — Golden Sky Minerals Corp.
- AUENX — AQR Large Cap Defensive Style Fund Class N
- AUERX — Auer Growth
- AUGO — Aura Minerals
- AUGX — Augmedix, Inc.
- AUID — authID Inc.
- AUL.V — Aurelius Minerals Inc.
- AULDX — American Century Ultra Fund
- AULT — Ault Alliance, Inc.
- AUM.V — AuMEGA Metals Ltd
- AUMB.V — 1911 Gold Corporation
- AUME.V — Auriginal Mining Corp.
- AUMI — Themes Gold Miners ETF
- AUMN.TO — Golden Minerals Company
- AUN.V — Aurcana Silver Corporation
- AUNA — Auna S.A.
- AUP.TO — Aurinia Pharmaceuticals Inc.
- AUPH — Aurinia Pharmaceuticals Inc.
