Is there a list available of the addresses for the aggregating wallets of major bitcoin exchanges? If so, where?
I use this website. https://www.walletexplorer.com/
You can filter bitcoin addresses by business organizations. You can also see updated list of transactions by each business organization. This site has exchange, pool, and other addresses.
Definitely never take information like this at face value, but it does provide some interesting insight.
Try searching for largest balances on the blockchain explorers and they sometimes have them labeled. For example: Bitcoin Rich List shows:
3D2oetdNuZUqQHPJmcMDDHYoqkyNVsFk9rwallet: Bitfinex-coldwallet 179,384 BTC
16ftSEQ4ctQFDtVZiUBusQUjRrGhM3JYwewallet: Binance-wallet 158,779 BTC
16rCmCmbuWDhPjWTrpQGaU3EPdZF7MTdUkwallet: Bittrex-coldwallet 112,203 BTC
3Nxwenay9Z8Lc9JBiywExpnEFiLp6Afp8vwallet: Bitstamp-coldwallet 101,848 BTC
3Cbq7aT1tY8kMxWLbitaG7yT6bPbKChq64wallet: Huobi-wallet 98,042 BTC