Although not directly related to SegWit,
this reddit post is a better indication of the experts who are running major Bitcoin related businesses' opinions. Provided that you trust that the author of that post is not lying (I am unsure of his ability to be trusted one way or another, although I have not seen any contradictions to what he has said), then the majority of Bitcoin related businesses are
neutral to the issue, and do not support one side or another.
OKCoin, BitFinex,Gemini ,BitFinex,BTCC, Kraken, Bitstamp, Bittrex, Coinfloor , Btc-e , QuadrigaCX, itBit , bitMex= We don't have an opinion because we either don't want to upset a subset of our users and/or we don't understand the proposals enough
Coinbase , Coinfloor= segwit
Btcpop = BU
Owners of BTCC and BitFinex have expressed segwit support elsewhere.
Exchanges make money of tx fees and will benefit greatly in the short term from Bitcoin splitting in 2 and a trading war begins so aren't the best businesses to ask regarding their opinion. The experts achow101 refers to anyways are devs not exchange owners anyways.
I would also point out that major businesses were threatened with bans on r/bitcoin after they publicly showed support for XT (and baseless ad-hominem attacks were thrown at the same businesses after they showed support for XT), so there is a legitimate business reason to withhold public opposition to SegWit (and public support for BU) if that is the business' actual position. There is no such business reason to withhold public support for SegWit when the business' actual position is that they support SegWit.
This isn't true. Supporters of segwit are viciously attacked all the time.