What Apollo filters target OT security buyers?

Filter by industry (manufacturing, utilities, oil and gas, mining), company size (500-10,000 employees), and job title keywords including OT Security, Industrial Cybersecurity, ICS Security, and CISO at industrial companies.

What job titles should OT security event invites target?

Primary: Head of OT Security, Director of Industrial Cybersecurity, ICS Security roles, and CISOs at manufacturing/utility companies. Secondary: Heads of IT (small manufacturers), Directors of Operations Technology, and Plant Managers at large facilities.

How many emails should an OT security event invite sequence have?

Three emails over seven days: Day 1 (topic-led invite), Day 4 (social proof and attendee context), Day 7 (last call with direct link). Under 150 words per email.

What event topics work best for OT security buyer invitations?

NERC CIP compliance readiness, ICS vulnerability management, OT network segmentation post-Accenture-Dragos consolidation, and cyber insurance requirements for critical infrastructure are the highest-converting topics in 2026.

Does Apollo have direct dial numbers for OT security contacts?

Apollo provides direct dials where available, typically covering 30-50% of contacts. Waterfall enrichment through Clay supplements Apollo's coverage for OT security contacts with lower LinkedIn presence.

What company size has the most OT security budget?

500-10,000 employees. Below 500, IT generalists handle OT with minimal dedicated budget. Above 10,000, procurement processes extend the sales cycle significantly.

Creating Event Invites for OT Security Buyers with Apollo in 2026: A Step-by-Step Playbook

How to Use Apollo to Build OT Security Event Invite Lists in 2026

Apollo''s people and company search filters are the fastest way to build a verified contact list for OT security event invitations. Unlike a generic cold outreach list, an event invite list is built around a single specific goal: getting the right OT security decision-makers to register for and attend a topic-led live event.

Here is the exact Apollo workflow for OT security buyer targeting.

Step 1 — Filter Companies by OT-Heavy Industry

In Apollo''s company search, apply the following filters to surface manufacturing, energy, and critical infrastructure companies:

Industry filters to select:

Oil and gas
Utilities (electric, gas, water)
Manufacturing (automotive, aerospace, chemicals, food and beverage, industrial machinery)
Mining and metals
Transportation and logistics (for port/maritime OT environments)

Company size: 500-10,000 employees (most OT security budget ownership lives here)

Geography: United States (or specific states — Texas for oil and gas, Ohio/Michigan/Indiana for automotive manufacturing, Southeast for chemical processing)

This typically surfaces 5,000-20,000 matching companies depending on filters. Export 1,000-3,000 for the invite list, prioritized by employee size and recent funding or growth signals.

Step 2 — Filter Contacts by OT Security Job Titles

Within those companies, filter by job title keywords that map to OT security budget authority:

Primary targets (highest conversion for event invites):

"OT Security" or "Operational Technology Security"
"Industrial Cybersecurity" or "ICS Security"
"CISO" at manufacturing or utility companies
"Critical Infrastructure Security"

Secondary targets (good for broader event fill):

"Head of IT" at companies under 2,000 employees (IT-OT convergence roles)
"Director of Operations Technology"
"VP of Operations" or "Director of Manufacturing" (operational resilience framing)
"Plant Manager" at 1,000+ employee facilities

Apollo''s keyword search within job titles surfaces these titles across your filtered company set. Export with verified email and direct dial where available.

Step 3 — Write the Event Invite Sequence (3 Steps)

OT security buyers respond to event invitations when the topic is specific and the expertise is credible. This is a 3-step sequence over 7 days:

Day 1 — Email 1 (Topic-led invite): Subject: [First Name] — OT Security Under Pressure: A Live Roundtable on [Specific Topic] Body: Acknowledge their specific environment (manufacturing / utilities / oil and gas). Describe the event topic — a specific compliance challenge, threat scenario, or market change (the Accenture-Dragos consolidation is a strong hook right now). Give date, time, format (45-min virtual roundtable, 15-20 people). One clear CTA: register here.

Day 4 — Email 2 (Social proof): Subject: [First Name] — Quick note on [Event Topic] Body: One line confirming the event, one line on who else is attending (other CISOs and OT security leads at [relevant sector]), one CTA to register. Under 100 words.

Day 7 — Email 3 (Last call): Subject: Last call — [Event Name] is this [Day] Body: Confirm it is happening, confirm the topic, give the direct registration link. Under 60 words.

Step 4 — Score Attendees with Apollo Engagement Data

After the event, use Apollo''s engagement tracking to identify which contacts opened all three emails, clicked the registration link, and attended live. These high-engagement contacts get priority in the follow-up sequence — they are the warmest leads in the list.

Apollo''s sequencer tracks email opens, clicks, and replies. Combined with event attendance data, you get a heat map of buyer interest that makes the post-event follow-up far more efficient than standard cold outreach.

The Result: Warm OT Security Leads from a Live Event

LinkedOtter builds and runs this event invite sequence for cybersecurity vendors. Recent results from OT-adjacent cybersecurity campaigns: 754 webinar signups in 26 days with 100+ from target accounts, 38 C-level attendees from a 1,266-prospect list, 43 qualified meetings in 60 days. Events from $6,000.

The Apollo list builds the audience. The event creates the warm signal. The follow-up converts it to pipeline.

Take the free 60-second check to see what this program generates for your OT security pipeline. See proof from cybersecurity campaigns or explore event pricing.