Kraken:

Kraken Integrates Lightning Network Deposits & Withdrawals
#17200
https://bitcoinmagazine.com/business/kraken-exchange-integrates-bitcoins-lightning-network

Cash App:

Cash App Users Can Now Invest Their Paychecks Into Bitcoin
#18637
https://www.forbes.com/sites/ninabambysheva/2022/04/07/cash-app-users-can-now-invest-their-paychecks-into-bitcoin

Cash App Announces Support for Unified QRs for Bitcoin/Lightning
#18631
https://bitcoinqr.dev

Robinhood:

All Eligible Waitlist Members Will be able to send/receive Bitcoin - Lightning Network is Coming to Robinhood
#18680
https://blog.robinhood.com/news/2022/3/28/the-future-of-investing-is-247-s8ksg

BitPay:

BitPay Merchants to Get a Boost From Lightning Network Payment Integration
#18435
https://www.coindesk.com/business/2022/04/06/bitpay-merchants-to-get-a-boost-from-lightning-network-payment-integration

BitGo:

BitGo is Working on Lightning Network Support
#18090
https://twitter.com/mikebelshe/status/1511075167518310414