If you have large gains in a highflying stock & want to sell it to buy a related etf for diversification, there is one obstacle.
The IRS will want its cut from your large capital gains.
Except when you do a 351-exchange from SMA or advisory portfolio into a 351-exchange etf without any tax consequences. But there are rules & restrictions.
Diversification test for contributed portfolio - single stock holdings < 25%; top 5 holdings < 50%
Accreditation requirements depend on brokerages
80% Control post-launch by the launch-investors
Tax-free Seeding happens only at inception; no continuing in-kind tax-free contributions
https://ybbpersonalfinance.proboards.com/thread/762/351-exchange-etfs
Comments
https://www.mutualfundobserver.com/discuss/discussion/comment/183280/#Comment_183280