Make a portfolio public and send the link to anyone. They see how it performs, and nothing about how much is in it.
Time-weighted and net return, today's move, the chart, and each holding's weight and return. All in percentages.
Amounts, share counts, cost basis, your name and your email. Search engines don't index the page either.
The portfolio name is the one thing on the page you choose, so use one that doesn't give you away.
Open a portfolio's settings and switch on Public. Copy the link from the portfolio page.