Tracker

The Tracker feature lets you monitor companies and people on LinkedIn for specific changes. When a tracked entity matches one of your rules, Fiber delivers a signal via webhook so you can act on it immediately.

This is also known as the "signals," "subscriptions," or "watchers" product. Note that saved searches are distinct from this.

How It Works

1. Create a tracker list — a named container that holds tracked entities and one or more rules.

2. Add entities — add companies (by LinkedIn URL, slug, or org ID) or people (by LinkedIn URL, slug, or user ID) to your list.

3. Define rules — each rule watches for a specific type of change (e.g., "headcount crossed 100", "person changed company").

4. Fiber monitors automatically — at the refresh interval you set (1–30 days), Fiber checks each entity and evaluates all rules.

5. Receive signals — when a rule fires, Fiber sends a webhook with details about what changed.

Key Concepts

Limits

Pricing

Each entity check costs 2 credits per refresh. For example, a list of 500 companies refreshed every 7 days costs 500 × 2 = 1,000 credits per week.

Use the Tracker Overview endpoint to get estimated daily and monthly credit burn for all your lists.

Lookback Period

By default, Fiber compares the current snapshot of an entity to the most recent previous snapshot (i.e., what changed since last check).

With the optional lookbackDays field, you can instead compare against a snapshot from approximately N days ago. This is useful for:

• Detecting changes over a longer window regardless of check frequency

• "Did X happen in the past 30 days?" style alerts

• Avoiding missed signals when check cadences change

If no historical snapshot from N days ago is available (e.g., the entity was recently added), the rule falls back to comparing against the most recent previous snapshot.

{
  "type": "headcount_growth_percent",
  "entityType": "company",
  "minPercentChange": 20,
  "direction": "grew",
  "lookbackDays": 30
}

Company Rules (24 types)

Headcount & Growth

headcount_crossed_threshold

Fires when a company's employee count crosses a specific number going up or down.

Use case: Get notified when a prospect company grows past 50 employees (likely ready for enterprise tools) or shrinks below 20 (may be downsizing).

{
  "type": "headcount_crossed_threshold",
  "entityType": "company",
  "direction": "above",
  "threshold": 100
}

headcount_growth_percent

Fires when headcount grows or shrinks by at least a given percentage.

Use case: Catch fast-growing startups (grew 30%+) or companies in trouble (shrank 20%+).

{
  "type": "headcount_growth_percent",
  "entityType": "company",
  "minPercentChange": 25,
  "direction": "grew"
}

employee_count_milestone

Fires when a company's employee count crosses a specific milestone (e.g., 100, 500, 1000).

Use case: Similar to headcount_crossed_threshold but semantically represents major milestones for segmentation.

{
  "type": "employee_count_milestone",
  "entityType": "company",
  "milestone": 500,
  "direction": "above"
}

department_size_threshold

Fires when a specific department's headcount crosses a threshold.

Use case: Alert when a company's engineering team grows past 20 — they're likely investing in building and may need dev tools.

{
  "type": "department_size_threshold",
  "entityType": "company",
  "department": "Engineering",
  "threshold": 20,
  "direction": "above"
}

recently_hired_with_title

Fires when a company makes a new hire whose title matches your keywords.

Use case: Know when a target account hires a new VP of Sales (your buyer persona) or a new CTO (decision-maker for your product).

{
  "type": "recently_hired_with_title",
  "entityType": "company",
  "titleKeywords": ["VP Sales", "Head of Sales", "CRO"],
  "minNewHires": 1
}

follower_count_growth

Fires when a company's LinkedIn follower count grows significantly.

Use case: Identify companies gaining social traction — often a leading indicator of brand momentum or viral marketing.

{
  "type": "follower_count_growth",
  "entityType": "company",
  "minAbsoluteGrowth": 1000,
  "minPercentGrowth": 10
}

Funding & Financials

new_funding_round

Fires when a company raises a new round of funding.

Use case: Get notified when tracked companies raise Series B+ rounds above $10M — they now have budget to spend.

{
  "type": "new_funding_round",
  "entityType": "company",
  "minAmountUsd": 10000000,
  "roundTypes": ["series_b", "series_c", "series_d"]
}

funding_stage_changed

Fires when a company moves to a new funding stage.

Use case: Detect companies progressing to Series A — transitioning from founder-led to building a proper GTM team.

{
  "type": "funding_stage_changed",
  "entityType": "company",
  "toStages": ["series_a", "series_b"]
}

acquired_company

Fires when a company makes an acquisition.

Use case: Acquisitions often trigger technology consolidation and vendor re-evaluation — a prime selling window.

{
  "type": "acquired_company",
  "entityType": "company",
  "minPriceUsd": 5000000
}

new_investor

Fires when a new investor is added to a company's profile.

Use case: When a strategic investor joins the cap table, it often signals a new direction or partnership opportunity.

{
  "type": "new_investor",
  "entityType": "company"
}

Hiring & Job Postings

job_posting_with_keyword

Fires when a company posts a job whose title contains your keywords.

Use case: A company posting for "data engineer" or "ML engineer" likely needs data infrastructure tools.

{
  "type": "job_posting_with_keyword",
  "entityType": "company",
  "keywords": ["data engineer", "machine learning", "ML engineer"],
  "seniorityLevels": ["Senior", "Lead"]
}

job_posting_in_function

Fires when a company posts a job in a specific department/function.

Use case: A company hiring heavily in Sales means they're scaling revenue — they may need CRM, sales enablement, or marketing tools.

{
  "type": "job_posting_in_function",
  "entityType": "company",
  "jobFunctions": ["Sales", "Business Development"]
}

News & Content

company_news

Fires when any news article is published about the company.

Use case: Stay informed about companies in your pipeline — news is a natural conversation starter.

{
  "type": "company_news",
  "entityType": "company",
  "minArticles": 2
}

news_with_keyword

Fires when a news article about the company matches specific keywords.

Use case: Track when target accounts are mentioned in news related to expansion, layoffs, product launches, or specific technologies.

{
  "type": "news_with_keyword",
  "entityType": "company",
  "keywords": ["expansion", "launch", "partnership", "contract"]
}

company_posted

Fires when the company publishes a LinkedIn post.

Use case: High-engagement posts from target companies can reveal priorities, wins, or challenges that make great outreach hooks.

{
  "type": "company_posted",
  "entityType": "company",
  "minReactions": 50
}

company_posted_with_keyword

Fires when a company post matches specific keywords.

Use case: Know when a company posts about hiring, product launches, or topics relevant to your solution.

{
  "type": "company_posted_with_keyword",
  "entityType": "company",
  "keywords": ["hiring", "scaling", "AI", "automation"]
}

Company Profile Changes

hq_location_changed

Fires when a company's headquarters location changes.

No additional fields — triggers on any HQ move.

Use case: Relocations often signal growth (moving to a bigger market) or downsizing. Either way, it's a trigger event for outreach.

{
  "type": "hq_location_changed",
  "entityType": "company"
}

company_status_changed

Fires when a company's operating status changes.

Use case: Know when a tracked prospect gets acquired (new buyer), goes public (bigger budget), or shuts down (remove from pipeline).

{
  "type": "company_status_changed",
  "entityType": "company",
  "toStatuses": ["acquired", "ipo"]
}

technology_added

Fires when a company adopts new technologies in their stack.

Use case: If a company adds a competing technology, it's too late. If they add a complementary one, it's the perfect time to reach out.

{
  "type": "technology_added",
  "entityType": "company",
  "technologies": ["Snowflake", "dbt", "Databricks"]
}

company_name_changed

Fires when a company changes its name. No additional fields.

Use case: Name changes often signal rebranding, pivots, or post-acquisition integration.

{
  "type": "company_name_changed",
  "entityType": "company"
}

company_description_changed

Fires when a company changes its LinkedIn description/tagline.

Use case: Description changes reflect strategic pivots — a company adding "AI-powered" to their description may be a fit for your ML tools.

{
  "type": "company_description_changed",
  "entityType": "company",
  "keywords": ["AI", "machine learning", "automation"]
}

company_logo_changed

Fires when a company updates its logo. No additional fields.

Use case: Logo changes are often part of a broader rebrand — a company reinventing itself may be evaluating new vendors.

{
  "type": "company_logo_changed",
  "entityType": "company"
}

company_went_inactive

Fires when a company's LinkedIn page appears to have gone inactive. No additional fields.

Use case: Detect companies that may be winding down operations, allowing you to clean your pipeline or adjust outreach.

{
  "type": "company_went_inactive",
  "entityType": "company"
}

new_office_location

Fires when a company opens a new office.

Use case: A company opening an office in your city creates a local relationship opportunity.

{
  "type": "new_office_location",
  "entityType": "company",
  "countries": ["US", "UK"],
  "cities": ["San Francisco", "New York"]
}

Person Rules (19 types)

Career Changes

person_changed_company

Fires when a person moves to a different company.

Use case: Your champion at a customer account just moved to a new company — follow them and sell into their new org.

{
  "type": "person_changed_company",
  "entityType": "person"
}

person_title_changed

Fires when a person changes their job title.

Use case: Detect when contacts get promoted to decision-making roles (VP, Director, C-level).

{
  "type": "person_title_changed",
  "entityType": "person",
  "titleKeywords": ["VP", "Director", "Head of", "Chief"]
}

person_got_promoted

Fires when a person gets promoted (stays at the same company but gets a more senior title).

Use case: A newly promoted VP often gets new budget authority and wants to make their mark — ideal for outreach.

{
  "type": "person_got_promoted",
  "entityType": "person",
  "seniorityKeywords": ["VP", "SVP", "Director", "Chief"]
}

person_started_company

Fires when a person starts their own company. No additional fields.

Use case: Track former champions or industry contacts who start companies — they'll need tools from day one.

{
  "type": "person_started_company",
  "entityType": "person"
}

person_employment_type_changed

Fires when a person's employment type changes (e.g., full-time to contract).

Use case: Someone going from full-time to contract/consulting may be a sign they're available as an advisor or buyer at a new client.

{
  "type": "person_employment_type_changed",
  "entityType": "person",
  "toTypes": ["Contract", "Self-employed"]
}

Status Signals

person_stealth_changed

Fires when a person enters or exits stealth mode (hides their activity/profile).

Use case: Someone entering stealth may be preparing to change jobs or start a company — reach out before the news breaks.

{
  "type": "person_stealth_changed",
  "entityType": "person",
  "direction": "entered"
}

person_open_to_work

Fires when a person starts or stops signaling they're open to new opportunities.

Use case: A VP of Engineering who just started "Open to Work" will soon land somewhere and need to evaluate vendors — get on their radar early.

{
  "type": "person_open_to_work",
  "entityType": "person",
  "direction": "started"
}

person_is_hiring

Fires when a person starts or stops signaling they're hiring.

Use case: When your champion signals "Hiring" — they have budget and headcount. Great time to pitch solutions that help their growing team.

{
  "type": "person_is_hiring",
  "entityType": "person",
  "direction": "started"
}

person_became_verified

Fires when a person gets LinkedIn verification. No additional fields.

Use case: Verified profiles often belong to high-profile individuals gaining influence — may indicate leadership visibility.

{
  "type": "person_became_verified",
  "entityType": "person"
}

Profile Changes

person_headline_changed

Fires when a person updates their LinkedIn headline.

Use case: Headline changes often signal career transitions, new responsibilities, or personal branding shifts.

{
  "type": "person_headline_changed",
  "entityType": "person",
  "keywords": ["looking for", "advisor", "consultant", "building"]
}

person_summary_changed

Fires when a person updates their LinkedIn summary/about section.

Use case: Summary updates signal a person is actively curating their professional image — often precedes or follows a career change.

{
  "type": "person_summary_changed",
  "entityType": "person",
  "keywords": ["open to", "seeking", "building"]
}

person_location_changed

Fires when a person's location changes.

Use case: Detect when contacts relocate to your target geography — opens door for local meetups and relationship building.

{
  "type": "person_location_changed",
  "entityType": "person",
  "toCountries": ["US", "GB", "DE"]
}

Skills & Activity

person_skills_added

Fires when a person adds new skills to their profile.

Use case: Someone adding "Kubernetes" or "Terraform" to their skills may be starting a cloud migration — relevant for infrastructure vendors.

{
  "type": "person_skills_added",
  "entityType": "person",
  "skills": ["Kubernetes", "Terraform", "AWS"]
}

person_new_certification

Fires when a person earns a new certification.

Use case: A new AWS or Azure certification suggests the person is investing in a technology — they may be evaluating complementary tools.

{
  "type": "person_new_certification",
  "entityType": "person",
  "certificationKeywords": ["AWS", "Azure", "GCP", "Kubernetes"]
}

person_tag_gained

Fires when a person gains a system-assigned tag.

Use case: Track when contacts gain specific organizational or behavioral tags within Fiber's enrichment system.

{
  "type": "person_tag_gained",
  "entityType": "person",
  "tags": ["founder", "investor"]
}

Social Activity

person_posted

Fires when a person publishes a LinkedIn post.

Use case: Monitor decision-makers' posts for engagement opportunities. Commenting on their posts builds relationship before pitching.

{
  "type": "person_posted",
  "entityType": "person",
  "minReactions": 10
}

person_posted_with_keyword

Fires when a person posts about a specific topic.

Use case: Know when your buyer posts about pain points your product solves — the most timely, relevant outreach possible.

{
  "type": "person_posted_with_keyword",
  "entityType": "person",
  "keywords": ["struggling with", "looking for", "evaluating", "scaling challenges"]
}

Growth Metrics

person_connections_milestone

Fires when a person's connection count crosses a threshold.

Use case: Track influencers growing their network — crossing 10K+ connections means broader reach for potential partnerships.

{
  "type": "person_connections_milestone",
  "entityType": "person",
  "threshold": 10000,
  "direction": "above"
}

person_follower_milestone

Fires when a person's follower count crosses a threshold.

Use case: Track contacts becoming thought leaders — crossing 50K followers means they're gaining significant influence.

{
  "type": "person_follower_milestone",
  "entityType": "person",
  "threshold": 50000,
  "direction": "above"
}

Creative Use Cases: Combining Rules

The real power of Tracker comes from combining multiple rules on the same list to catch complex signals. Here are proven strategies:

1. Buying Intent Detection (Company List)

Combine hiring signals with growth signals to find companies actively investing:

[
  { "type": "job_posting_with_keyword", "entityType": "company", "keywords": ["data engineer", "analytics"] },
  { "type": "headcount_growth_percent", "entityType": "company", "minPercentChange": 15, "direction": "grew" },
  { "type": "new_funding_round", "entityType": "company", "minAmountUsd": 5000000 }
]

Any one of these firing means the company is likely spending — all three together is a very strong signal.

2. Champion Tracking (Person List)

Track your existing champions and power users for career moves:

[
  { "type": "person_changed_company", "entityType": "person" },
  { "type": "person_got_promoted", "entityType": "person" },
  { "type": "person_open_to_work", "entityType": "person", "direction": "started" },
  { "type": "person_is_hiring", "entityType": "person", "direction": "started" }
]

When a champion changes companies, you have a warm intro to their new org. When they get promoted, they have more authority to expand your contract.

3. Competitive Intelligence (Company List)

Monitor competitors for strategic moves:

[
  { "type": "technology_added", "entityType": "company", "technologies": ["React", "Next.js"] },
  { "type": "recently_hired_with_title", "entityType": "company", "titleKeywords": ["VP Product", "CTO"] },
  { "type": "acquired_company", "entityType": "company" },
  { "type": "company_description_changed", "entityType": "company" }
]

4. Market Expansion Detection (Company List)

Identify companies entering new markets:

[
  { "type": "new_office_location", "entityType": "company", "countries": ["US"] },
  { "type": "job_posting_with_keyword", "entityType": "company", "keywords": ["country manager", "regional director"] },
  { "type": "hq_location_changed", "entityType": "company" }
]

5. Pre-Churn Risk Detection (Person List)

Monitor key contacts at existing customers for early churn signals:

[
  { "type": "person_open_to_work", "entityType": "person", "direction": "started" },
  { "type": "person_stealth_changed", "entityType": "person", "direction": "entered" },
  { "type": "person_changed_company", "entityType": "person" },
  { "type": "person_headline_changed", "entityType": "person", "keywords": ["looking for", "open to"] }
]

If your main point of contact is leaving, you need to build a new relationship before the handoff.

6. Fundraise Timing (Company List + Lookback)

Use lookback periods to detect sustained growth patterns that predict upcoming fundraises:

[
  { "type": "headcount_growth_percent", "entityType": "company", "minPercentChange": 30, "direction": "grew", "lookbackDays": 90 },
  { "type": "job_posting_in_function", "entityType": "company", "jobFunctions": ["Finance", "Legal"] },
  { "type": "recently_hired_with_title", "entityType": "company", "titleKeywords": ["CFO", "VP Finance", "Controller"] }
]

30%+ headcount growth over 90 days combined with finance hires often precedes a fundraise announcement.

7. Decision-Maker Identification (Person List)

Track people for signals they've become decision-makers:

[
  { "type": "person_got_promoted", "entityType": "person", "seniorityKeywords": ["VP", "C-level", "Director"] },
  { "type": "person_is_hiring", "entityType": "person", "direction": "started" },
  { "type": "person_follower_milestone", "entityType": "person", "threshold": 5000, "direction": "above" }
]

8. Technology Adoption Timing (Company List)

Catch companies at the exact moment they're evaluating new tech:

[
  { "type": "technology_added", "entityType": "company", "technologies": ["Snowflake"] },
  { "type": "job_posting_with_keyword", "entityType": "company", "keywords": ["Snowflake", "data warehouse", "dbt"] },
  { "type": "recently_hired_with_title", "entityType": "company", "titleKeywords": ["Data Engineer", "Analytics Engineer"] }
]

If they're adding Snowflake, hiring data engineers, AND posting data jobs — they're building a data stack right now.

API Quick Reference

Webhook Delivery

When a rule fires, Fiber delivers a webhook containing the signal. Each signal includes:

• id — Unique signal ID

• entityId — The tracked entity that triggered the signal

• entityType — "company" or "person"

• linkedinIdentifier — LinkedIn org ID or user ID

• type — The rule type that fired (e.g., "headcount_crossed_threshold")

• summary — Human-readable description of what changed

• changeData — Array of objects with the specific changes detected

• observedAt — When the change was detected

Configure your webhook URL in the Fiber dashboard under Tracker settings.