List of companies that did not sign the NYA (aka B2X or SegWit2x)

• Acinq - Bitcoin LN scalability provider
• Anycoin Direct - European Bitcoin broker
• Azteco - Consumer Bitcoin
• Belgacoin - Large European Bitcoin exchange/broker
• Bernstein - Blockchain-based solutions for intellectual property protection
• BHB.network - Applied research lab - Consultancy firm, competence center and incubator
• Bisq - Decentralized Bitcoin exchange
• bit2c - Israel's top Bitcoin exchange
• Bitaccess - Canadian Bitcoin ATM network
• BitBargain - UK Bitcoin exchange
• BitBay - Bitcoin broker based in Poland
• BitcoinBrains - Canada ATMs and online brokerage service
• Bitcoin Cambodia - Cambodian Bitcoin broker
• Bitcoin Romania - Largest Romanian Bitcoin exchange & broker
• bitcoin.co.id - Indonesia's largest Bitcoin exchange
• bitcoin.co.th - One of Thailand's largest Bitcoin brokers/exchange
• Bitcoin.de - One of Europe's largest P2P Bitcoin exchanges
• BitcoinReminder - Notification service
• BitcoinSolutions - Buy and sell bitcoin online and at Canada ATMs
• Bitfinex - One of the world's largest Bitcoin exchanges
• Bitit - European Bitcoin broker
• BitNational - Canada's Bitcoin ATM network
• Bitonic - Dutch Bitcoin broker
• BitPanda - One of Europe's largest Bitcoin brokers
• BitPremier - The Bitcoin luxury marketplace
• BitQuick - Major cash to Bitcoin exchange in the USA
• Bitrated - Trust and rating system
• Bitrefill - Mobile phone topups with Bitcoin
• Bitrush - Dutch Bitcoin broker
• Bits of Gold - Israel's largest Bitcoin broker
• Bitsewa - Nepal's largest Bitcoin exchange
• Bitstamp - One of the world's largest Bitcoin exchanges
• Bitstop - Bitcoin ATM operator
• Blockstream - Blockchain technologies provider
• BuyaBitcoin - Australian cash to bitcoin exchange
• Buy Bitcoin Worldwide - Bitcoin informational site
• Bylls - Pay bills using Bitcoin
• Catallaxy - Blockchain solutions and support
• CEX.io - Top global Bitcoin and crypto exchange
• Chaincode - Bitcoin technologies R&D
• Ciphrex - Wallet
• Coin Loft - Australian cash to Bitcoin exchange
• Coincheck - One of Japan's largest Bitcoin exchanges
• CoinCorner - European Bitcoin broker
• Coinfloor - European Bitcoin broker and exchange
• CoinHako - One of Singapore's largest Bitcoin exchanges
• coinhouse - Credit card to Bitcoin broker run by Ledger
• CoinJar - Australian Bitcoin broker
• Coinkite - Bitcoin infrastructure solutions
• CoinMama - One of the world's largest credit card to Bitcoin brokers
• Cryptobuyer - Venezeulan Bitcoin exchange
• Cubits - European Bitcoin broker
• Denarium - Physical BTC coins
• Digitalbitbox - Bitcoin hardware wallet
• Electrum - Bitcoin desktop wallet
• Flyp.me - Accountless crypto-to-crypto exchange
• FOXBIT - Brazilian Bitcoin exchange
• Gatecoin - Bitcoin exchange
• Gemini - One of the world's largest Bitcoin exchanges
• GreenAddress - Bitcoin web wallet
• HolyTransaction - One of the oldest multi-currency web wallet
• itBit - OTC Bitcoin trading
• Kraken - World's largest EUR Bitcoin exchange based on volume
• LakeBTC - Bitcoin exchange
• LibertyX - Major US cash to Bitcoin exchange
• Lightning Labs - Building lightning network layer 2 infrastructure
• LocalBitcoins - World's largest P2P Bitcoin exchange
• MaiCoin - Taiwanese Bitcoin exchange
• Mercado Bitcoin - Brazilian Bitcoin exchange
• Metaco - Payment solutions
• Mycelium - Popular Android Bitcoin wallet
• Nairaex - Nigeria's largest Bitcoin exchange
• NeoDisrupt - Global cash to Bitcoin exchange, DAX and payment processing
• OpenTimestamps - Scalable timestamping with Bitcoin
• OXT - Blockchain explorer
• Paycase - Paycase Remit
• Paymium - Bitcoin broker based in France
• Poloniex - World's largest cryptocurrency exchange
• Prasos - Leading Nordic bitcoin broker
• QuickBT - Buy Bitcoin with Debit, Credit, or Cash
• Samourai Wallet - Android Bitcoin wallet
• Satoshi Counter - Canadian OTC Bitcoin exchange
• Satoshi Tango - Latin American Bitcoin exchange
• Slush Pool - Bitcoin mining pool
• SurBitcoin - Venezuela's largest Bitcoin exchange
• TREZOR - Hardware Bitcoin wallet
• The Bitcoin Report - Media Company
• Urdubit - Bitcoin exchange based in Pakistan
• Vaultoro - Gold/bitcoin exchange
• VirWoX - World's largest Paypal to Bitcoin exchange
• Volabit - Mexican Bitcoin exchange
• Wall of Coins - Major US cash to Bitcoin exchange]
• Walltime - Brazilian Bitcoin exchange
• XBT.eu - Bitcoin Blockchain Statistics
• Xotika.tv - Bitcoin Social Video-Streaming Platform
• Zebpay - One of India's largest Bitcoin exchanges

Need clarification:

• Huobi - Chinese Bitcoin exchange
• OKCoin - Chinese Bitcoin exchange

Does not run full nodes:

• breadwallet - Most popular iOS Bitcoin wallet

Maybe / Unsure

• Bittylicious - One of the UK's largest Bitcoin brokers

Will Support Post Fork

• Ledger Wallet - Hardware Bitcoin wallet

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This list originated from a reddit collection later posted on PasteBin. If you see something wrong, changed your mind or want to be added? Just make a PR here

Other lists to check out on Bitcoin Wiki