EOS shares are sinking 5% today. Is the huge rally running out of steam?

Electro Optic Systems Holdings Ltd (ASX: EOS) shares are taking a breather on Friday following a huge run over the past month.

At the time of writing, the EOS share price is down 5.54% to $10.40 apiece.

The stock opened at $10.82 and traded as high as $11.10 earlier in the session.

But the pullback follows a very strong run over the past few weeks.

Even after today’s fall, EOS shares are still up around 40% over the past month. And if you zoom out a little further, the shares have almost doubled since February this year.

So, are investors simply taking some money off the table, or is there more going on?

What is weighing on EOS shares today?

There doesn’t appear to be any fresh company news behind the drop, so this looks more like some profit-taking after a stellar few weeks.

EOS shares jumped 23% on Tuesday after the company released its half-year results, before adding another 6.2% on Wednesday. They then slipped 2.1% on Thursday and are giving back more ground today.

The rebound has been even more impressive since the end of July. EOS shares closed at just $6.10 on 30 July, meaning the stock has climbed more than 70% from that level in less than a month.

Given how quickly the shares have climbed, it’s easy to see why some investors might be cashing in some gains.

Why did the shares jump this week?

The half-year result gave investors plenty to get excited about.

Revenue from continuing operations surged 283% to $168.8 million, helped by a big increase in activity across its defence systems business. Underlying EBITDA also swung to a $21.6 million profit from a $14.9 million loss a year earlier.

There was still a $33.7 million loss from continuing operations, although that included a $34 million non-cash fair value loss tied to the MARSS acquisition.

The order book was probably one of the biggest numbers in the results. Contracted work reached around $846 million at 30 June, up from just $170 million a year earlier.

Management is now guiding to full-year 2026 revenue of $360 million to $400 million.

If EOS can hit that range, it would deliver record annual revenue and show investors just how quickly the business is growing.

Foolish takeaway

After climbing so fast over the past month, EOS shares could stay volatile in the near term.

I’d keep an eye on the $10 level first, which has become an important area for the shares this year. Above that, Thursday’s intraday high of $11.98 is another level to watch, before the stock runs into its 52-week high of $12.58.

Bell Potter also remains positive after the result, keeping its buy rating and $12.60 price target.

That target sits right around the previous high, so the next test is whether EOS can keep winning contracts.