While the value of your investments will naturally fluctuate according to market forces over time, you can feel sure that your underlying investments (the company stocks/shares that you own) are safe.
Your US stock investments are safeguarded by a federally mandated, nonprofit organisation, the Securities Investor Protection Corporation (SIPC).
SIPC protection extends to non-US citizens, covering accounts up to $500,000 (including $250,000 cash claims) per client, as defined by SIPC rules. This cover ensures that if anything happens to us (Plum) or our investment broker (Alpaca), your investments can be transferred back to you and not touched by anyone that we or our broker owes money to.