BAE systems (LSE: BA) Shares have held steady over the past tumultuous week. This is hardly surprising. These are defense stocks and unfortunately demand is currently growing.

Shares in FTSE100 stock prices have risen over years of rising geopolitical concerns, and now we have a fresh worry. In five years, the BAE System share price increased by 345%, plus dividends. It increased by 33% in 12 months. However, the results in the last worrying week were disappointing. It increased by a modest 1.5%.

That’s obviously much better than most of the FTSE 100, which is down 4% this week. However, with BAE Systems’ price-to-earnings (P/E) ratio of 28.6, investors are clearly wary of buying at today’s price.

FTSE 100 on the defensive

Full-year results published on February 18 showed a 12% escalate in underlying operating profit in 2025 to £3.32 billion, beating expectations, with the order book reaching a record £83.6 billion. But it’s all included now. Member of the FTSE 100 defense exchange Babcock International Group has not changed over the last week. It is also pricey, with a P/E ratio of 27.

I think it’s still worth considering both options in the long term, but many FTSE 100 companies have shown greater resilience in what has been a terrible week, including three in my SIPP.

BP this, not surprisingly, is my best result, with the oil giant up 3.72%. Some might have expected an even greater response. BP can continue to deliver this. Brent crude rose from just over $70 a barrel to $85 in a week, with some forecasters suggesting it could exceed $100 or even $200.

With a trailing yield of 5%, I believe BP is worth considering for earnings and growth, although no one should assume that crude oil will continue to rise inexorably. BP could make a quick exit if politicians find a way out of the current uncertainty, as we hope they will.

BP and Bunzl are worth considering

My favorite FTSE 100 inventory, distribution and outsourcing specialist Bunzlchose an odd moment to rebound, climbing 3.43% for the week. But it’s still down 27% over 12 months as sales and profits become uneven after years of steady growth.

Monday’s full-year results (March 2) show that the situation is not over yet. But Bunzl has a fantastic track record of annual dividend growth spanning over three decades, and still looks like good value with a P/E ratio of 12.5. That’s up from 10.6 just a few days ago, so it’s getting more pricey.

Another recent SIPP purchase at a discounted price, London Stock Exchange Groupcontinues its nervous recovery from the recent artificial intelligence scare that threatens to destroy the business models of data and analytics companies. The company’s shares are up 2.87% this week, but are still down 25% for the year. I’m still a little annoyed by the impact of AI causing panic wherever it appears, but I think it may be worth considering for braver investors.

Some FTSE 100 stocks that I don’t own did even better. Admiral’s Group rose 5% this week, while Airtel Africa, RELAX AND Rentokil IndiaWe all beat everything in my SIPP. Despite today’s uncertainty, there is still plenty of growth and dividend income opportunity in the FTSE 100.