- Apto
- Aptose Biosciences, Inc.
- Aptv
- Apvo
- Apxi
- Apyx
- Apyx Medical Corporation
- Aqb
- Aqms
- Aqst
- Aqu
- AquaBounty Technologies, Inc.
- Aqua Metals, Inc.
- Aquestive Therapeutics, Inc.
- Ar
- Aramark
- Aray
- Arbutus Biopharma Corporation
- Arc
- ArcBest Corporation
- Arcadia Biosciences, Inc.
- Arcb
- Arcc
- Arch
- Arch Resources, Inc.
- Archer-Daniels-Midland Company
- Archrock, Inc.
- Arct
- Arcturus Therapeutics Holdings Inc.
- Arcus Biosciences, Inc.
- Arcutis Biotherapeutics, Inc.
- Ardelyx, Inc.
- Are
- Arec
- Aren
- Ares
- Ares Commercial Real Estate Corporation
- Argan, Inc.
- Arhaus, Inc.
- Arhs
- Ari
- Aris
- Aris Water Solutions, Inc.
- Arista Networks, Inc.
- Ark Restaurants Corp.
- Arko
- Arkr
- Arl
- Arlo
- Arlo Technologies, Inc.
- Arlp
- Armata Pharmaceuticals, Inc.
- Armk
- Armp
- Armstrong World Industries, Inc.
- Aroc
- Arow
- Arq
- Arqit Quantum Inc.
- Arqt
- Arr
- Array Technologies, Inc.
- Arrow Electronics, Inc.
- Arrow Financial Corporation
- Arrowhead Pharmaceuticals, Inc.
- Arry
- Art's-Way Manufacturing Co., Inc.
- Arteris, Inc.
- Arthur J. Gallagher & Co.
- Artisan Partners Asset Management Inc.
- Artivion, Inc.
- Artna
- Artw
- Arvinas, Inc.
- Arvn
- Arw
- Arwr
- Aryd
- Asan
- Asana, Inc.
- Asb
- Asbury Automotive Group, Inc.
- Ascent Industries Co.
- Ascent Solar Technologies, Inc.
- Asensus Surgical, Inc.
- Asgn
- Ash
- Ashford Inc.
- Asix
- Asle
- Asmb
- Asns
- Aso
- Aspen Aerogels, Inc.
- Aspen Technology, Inc.
- Aspi
- Aspira Women's Health Inc.
- Aspira Women’s Health Inc.
- Aspn
- Asps
- Asrt
- Asrv
- Assembly Biosciences, Inc.
- Assertio Holdings, Inc.
- AssetMark Financial Holdings, Inc.
- Associated Capital Group, Inc.
- Asst
- Assure Holdings Corp.
- Astc
- Aste
- Astec Industries, Inc.
- Asth
- Asti
- Astria Therapeutics, Inc.
- AstroNova, Inc.
- Astrotech Corporation
- Asts
- Asur
- Asure Software, Inc.
- Asxc
- Asys
- Atai
- Atara Biotherapeutics, Inc.
- Atea Pharmaceuticals, Inc.
- Atec
- Atek
- Aten
- Ater
- Aterian, Inc.
- Atex
- Atge
- Atha
- Athira Pharma, Inc.
- Ati
- Atif
- Atip
- Atkore Inc.
- Atkr
- Atlantic American Corporation
- Atlas Corp.
- Atlas Crest Investment Corp.
- Atlas Lithium Corporation
- Atlassian Corporation Plc
- Atlc
- Atlo
- Atlx
- Atmc
- Atmos Energy Corporation
- Atmu
- Atmus Filtration Technologies Inc.
- Atmv
- Atni
- Atnm
- Ato
- Atom
- Atomera Incorporated
- Atos
- Atossa Therapeutics, Inc.
- Atpc
- Atr
- Atra
- Atrc
- Atri
- AtriCure, Inc.
- Atrion Corporation
- Atro
- Atsg
- Atus
- Atxi
- Atxs
- Atyr
- Aub
- Aubn
- Auburn National Bancorporation, Inc.
- AudioEye, Inc.
- Augmedix, Inc.
- Augx
- Auid
- Aumn
- Auph
- Aur
- Aura
- Aura Biosciences, Inc.
- Aurinia Pharmaceuticals Inc.
- AuthID Inc.
- Autl
- AutoNation, Inc.
- AutoZone, Inc.
- Autodesk, Inc.
- Autolus Therapeutics plc
- Automatic Data Processing, Inc.
- Ava
- Avadel Pharmaceuticals plc
- Avah
- AvalonBay Communities, Inc.
- Avalon Holdings Corporation
- Avangrid, Inc.
- Avanos Medical, Inc.
- Avav
- Avb
- Avbp
- Avd
- Avdl
- Avdx
- Aveanna Healthcare Holdings Inc.
- Avenue Therapeutics, Inc.
- Avenview Inc.
- Avery Dennison Corporation
- Avgo
- Avgr
- Aviat Networks, Inc.
- AvidXchange Holdings, Inc.
- Avidity Biosciences, Inc.
- Avient Corporation
- Avinger, Inc.
- Avir
- Avis Budget Group, Inc.
- Avista Corporation
- Avita Medical, Inc.
- Avnet, Inc.
- Avns
- Avnw
- Avo
- Avpt
- Avro
- Avt
- Avte
- Avtr
- Avtx
- Avxl
- Avy
- Aware, Inc.
- Awh
- Awi
- Awk
- Awr
- Awre
- Awx
- Ax
- Axalta Coating Systems Ltd.
- Axcelis Technologies, Inc.
- Axdx
- Axgn
- Axil
- Axl
- Axnx
- Axogen, Inc.
- Axon
- Axon Enterprise, Inc.
- Axonics, Inc.
- Axonics Modulation Technologies, Inc.
- Axp
- Axr
- Axs
- Axsm
- Axsome Therapeutics, Inc.
- Axta
- Axti
- Ayi
- Ayro
- Aytu
- Aytu BioPharma, Inc.
- Azek
- Azenta, Inc.
- Azitra Inc.
- Azo
- Azpn
- Azta
- Aztr
- Azz
- B
- B&G Foods, Inc.
- B&G 푸즈
- B&G 푸즈 (B&G Foods, Inc., BGS)
- BA
- BAER
- BAER (BAER, BAER)
- BAFN
- BAH
- BALL
- BALY
- BANC
- BANC (BANC, BANC)
- BAND
- BANF
- BANF (BANF, BANF)
- BANR
- BARK
- BARK (BARK, BARK)
- BASE
- BATL
- BATL (BATL, BATL)
- BATRA
- BATRA (BATRA, BATRA)
- BATRK
- BATRK (BATRK, BATRK)
- BAX
- BAYA
- BAYA (BAYA, BAYA)
- BB
- BBAI
- BBAI (BBAI, BBAI)
- BBCP
- BBCP (BBCP, BBCP)
- BBDC
- BBDC (BBDC, BBDC)
- BBGI
- BBIO
- BBSI
- BBW
- BBWI
- BBY
- BC
- BCAB
- BCAL
- BCBP
- BCB Bancorp, Inc.
- BCC
- BCG
- BCG (BCG, BCG)
- BCLI
- BCML
- BCO
- BCOV
- BCOW
- BCO (BCO, BCO)
- BCPC
- BCRX
- BCSA
- BCSA (BCSA, BCSA)
- BCSF
- BCSF (BCSF, BCSF)
- BCTX
- BCTX (BCTX, BCTX)
- BCYC
- BC (BC, BC)
- BDC
- BDC (BDC, BDC)
- BDL
- BDN
- BDN (BDN, BDN)
- BDSX
- BDTX
- BDX
- BDX (BDX, BDX)