After the Nvidia stock crash, here’s what I’m doing in my ISA and SIPP

What a terrible period it has been for investors holding Nvidia (NASDAQ:NVDA) stock in their ISA and Self-Invested Personal Pension (SIPP) portfolios. The tech giant’s share price has collapsed and founder, CEO, president, and Mr Nvidia himself, Jensen Huang, has resigned.

I’m one of those unlucky souls holding Nvidia shares. What am I doing now?

From bad to worse

Prior to Thursday (12 November), I thought Huang might hang on as chief executive. Yes, the extra-marital affair with an alleged Chinese spy was obviously a serious issue. But there was no indication that the tech boss had divulged any secrets.

After all, President Trump (who had reportedly known about the issue for some months) publicly sang Huang’s praises when the news broke. Would he have done that if there was more to come out? I doubt it.

However, when reports emerged of a second alleged affair with an employee on Thursday, the writing was on the wall for me. Nvidia’s board would have surely acted if Huang hadn’t walked first.

Am I selling my Nvidia shares?

Now, Huang’s departure was a massive shock to me. But key-man/person risk is something I have repeatedly warned about in the past.

In March 2025, I wrote: “I would argue that Nvidia carries more key-person risk in the form of founder-CEO Jensen Huang than any other company. Without his vision and leadership, I would think twice about investing in the company“.

Then in August 2025: “Another thing that isn’t often mentioned is key-person risk in the shape of CEO Jensen Huang… he is a rare visionary leader“.

You get the idea. So what will I do? To be honest, I’m not quite sure yet. I’m still processing what has happened. Can Nvidia still function as an elite growth company without Huang’s leadership? Or will it turn into Manchester United post-Alex Ferguson?

On Tuesday (17 November), Nvidia reports its third-quarter results. I’ll wait to read those before making a decision. But there’s a risk that any weakness in the report (particularly guidance) could spark another sell-off.

Then again, the stock’s now trading really cheaply. The forward price-to-earnings ratio is just 11 — that’s cheaper than all other Magnificent Seven stocks and the wider S&P 500. I’m loath to sell Nvidia so cheaply.

If I didn’t own the stock, I would at least consider it due to the super-low valuation and strong AI-related growth expected. It may well be a massive bargain.

Yet with no obvious successor in place, I’m wary about buying more shares. I’m sitting still for now.