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S4x25 is Feb 11 – 13
JW Marriott Tampa Water Street

We’re excited to move S4 to Tampa for 2025. The JW Marriott is bigger and newer. We won’t need to limit the number of attendees. We will have bigger spaces for S4 Stages, Birds of a Feather events, industry meetings and other activities. While we will miss the Welcome Party and Cabana Sessions, the S4 Big Party on Wednesday night will offer even more than those past two events. Tampa is different too. Different vibe; different opportunities; and different challenges. It’s a great canvas for S4.

Check out the S4x25 page for key dates, sponsor information and the latest updates.

We still like Miami South Beach and will back there at least one more time for S4x26 (23-26 February 2026).

S4x25 Call For Presentations Opens In

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S4 is …

Optimistic … Forward Looking … Creative … Driving Change

Set free a conservative, slow moving, change resistant community to discover new ideas and come up with innovative ways to use these new ideas to deploy secure, resilient and better ICS.

After a Covid caused cancellation of S4x21, S4 came roaring back with a record 800 attendees and warmth of spirit at S4x22. S4x23 in February sold out with 1,100 attendees, and this will be the attendee limit for S4x24. More important than the numbers were the percentage of new and diverse talent we are seeing and the spirit that has been maintained at S4 despite the growth from 40 people in a small room in 2007.

The best way to understand how S4 is different is to come to the event. The second best way is to ask someone who has attended, obviously we are biased. S4 is not for everyone. If you are an early adopter, like to be on the leading edge, or enjoy hearing, considering and creating new ideas, then there is a good chance S4 will be a great event for you.

 

Create The Future of OT and ICS Security at S4

S4x22 Postponed Until Late Spring

S4x22 Postponed Until Late Spring

The miracle we hoped for over the holidays didn't happen. While the news about the lower lethality is great, the large numbers of people getting sick and projected to get sick this month made it impossible to hold the event as scheduled. Even if we could get a good...

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Omicron

With RSA being cancelled, I'm sure attendees, speakers, sponsors and others are wondering about S4x22, Jan 25-27 in Miami South Beach. Over the past week we have been contingency planning a move of the event to late spring, and we have an early plan in place to do...

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S4x22 Mobile App

S4x22 Mobile App

With the move to a second building, increased S4 experiences, and social event activities we wanted to find a way to help attendees navigate the event. The answer is the S4x22 mobile app. Here are five of the big benefits of the S4x22 mobile app. Access to the 3-stage...

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OPC UA Targets At Pwn2Own Miami

OPC UA Targets At Pwn2Own Miami

Pwn2Own Miami is coming back to find 0days in important ICS products. You can see all the details at the ZDI site, and we encourage you to register with them if you are interested in participating and potentially winning some serious money ($280K was won at the...

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Wednesday’s Amazing Keynote Block

Wednesday’s Amazing Keynote Block

This may be the best 3-session keynote block ever at S4. Niloofar Razi Howe will kick off the day with a keynote, and then Dale Peterson will interview CISA Director Jen Easterly and Google's Phil Venables. And since this is Women In ICS Security Wednesday, any women...

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An ICS CTF At S4x22

An ICS CTF At S4x22

Reid Wightman used to run an epic ICS Capture The Flag (CTF) event at S4 that had many teams working around the clock in a very competitive contest. The S4 CTF was retired at S4x20, and replaced with the Pwn2Own competition. Still there were many past attendees who...

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