Data Appending Services
Most B2B databases have holes — missing emails on records you spent thousands acquiring, missing direct dials your SDRs need, missing firmographics that block your segmentation. Our Data Appending Services fill those holes against our 180M+ verified B2B universe, so the records you already own become reachable, segmentable and bookable for outreach.
Live · verified dataWhat’s inside the Data Appending Services?
Data Appending Services turns your existing records into clean, routable, bookable pipeline. Upload your file or stream records in real time; we return enriched, deduped, verified contacts ready for your reps.
We integrate natively with Salesforce, HubSpot, Microsoft Dynamics, Marketo and Pardot — pushing cleaned, enriched and verified records directly into your stack so your team operates from a single source of truth.
Processing is batch or real-time, depending on your needs — bulk file appends typically turn around in 24-48 hours, and real-time API calls return enriched records in under 250ms for live workflows like form-fill enrichment or lead routing.
Every output is delivered with a clear provenance audit — which sources contributed which fields, when each field was last verified, and the confidence score behind each enrichment — so your data team can defend the inputs in any internal review.
Every record is multi-source verified across our 180M+ universe and 40+ public and proprietary data signals, with continuous refresh available so the data ages with the market rather than against it.
Every record is permission-based, re-verified at the moment of delivery, and filtered through regional compliance rules — so your campaigns land clean and deliverable.
What you can expect
The outcomes our clients consistently see from this program.
- Match rate 95%+ on typical files
- Batch or real-time API
- Confidence scoring per record
- Ongoing refresh optional
A closer look at our Data Appending Services.
We support every common field append — email, phone, direct dial, job title, seniority, company size, revenue, SIC/NAICS, tech stack, social profiles and reverse lookups. Match rates typically run 60–85% on well-formed B2B files, and every appended field is verified at delivery rather than pulled from a quarterly refresh. You only pay for records we successfully append, and we share a free 100-record sample so you can validate match accuracy before committing.
Appending into your existing database is dramatically cheaper than acquiring new top-of-funnel records. Campaigns that would have stalled — going to disconnected numbers, bouncing emails, sequences quitting because the record is too thin — turn back into pipeline. We deliver in 3–5 business days, push directly into Salesforce, HubSpot and most major CRMs, and back the work with a re-deliver-or-credit quality guarantee.
Ready to scope a Data Appending engagement? Talk to a real operator — you'll get a written scope, a sample of 25–50 verified records, and a confirmed delivery date within one business day.
Built to deliver — or it ships back free.
95%+ deliverability
Every record re-verified at the moment of request.
Multi-source verified
Cross-referenced across 40+ public and proprietary sources.
Compliance baked in
GDPR, CCPA and CAN-SPAM applied automatically.
Delivered in 48 hours
Most lists ship same day. Full ICP builds in 48 business hours.
Built for modern revenue teams
Own a number? This is built for you.
SDR, AE and RevOps teams we work with daily.
10-person teams to Fortune 500 revenue orgs.
White-label delivery available.
How Our Data Appending Works?
A repeatable, transparent workflow that gets your data production-ready — fast.
- 01
Submit your file
Securely share your existing customer or prospect file in any common format — CSV, XLSX or direct CRM connection.
- 02
Match against our universe
We cross-reference your records against our 180M+ verified B2B contacts using multi-source signals and proprietary match logic.
- 03
Append missing fields
Missing emails, direct dials, job titles, firmographics and tech stack signals are filled in — only where we can verify confidently.
- 04
Re-verify and deliver
Every appended record is re-verified at the point of delivery and returned in your preferred format with confidence scoring per field.
How Can It Benefit Your Business?
Cleaner data isn't the goal — measurable revenue impact is. Here's what changes when this layer is fixed.
Reach more of your existing pipeline
Recover dormant or incomplete records that were stalling because contact data was missing.
Cut acquisition cost
Activating data you already own is far cheaper than buying new lists or running fresh top-of-funnel.
Lift campaign deliverability
Verified emails and phones mean less bounce, less spam-folder waste and more meetings booked.
Smarter segmentation
Appended firmographics and technographics enable tighter ICP segments and more relevant messaging.
Types of Data Appending We Provide
Choose a single service or combine them into an end-to-end data program — we tailor scope to your stack and ICP.
Email Appending
Add verified business email addresses to records that only have name and company.
Phone & Direct-Dial Appending
Append verified office numbers and direct-dial mobile phones for outbound calling teams.
Reverse Appending
Start with an email or phone and append the full contact and firmographic profile.
Firmographic Appending
Add company size, revenue, industry, SIC/NAICS code and HQ details to thin records.
Technographic Appending
Layer installed-tech signals onto your records — CRMs, ERPs, cloud platforms and more.
LinkedIn / Social Appending
Attach professional profile URLs for ABM, social selling and audience targeting.
What Makes Our Data Appending Unique?
How Data Is Sourced and Verified?
Every record on this list passes through a four-stage compile-and-verify process before delivery.
- 01
Multi-source compile
Records are aggregated from public business directories, professional networks, permissioned partner feeds and proprietary research signals.
- 02
Email & phone verification
Every email is SMTP-verified and every phone is HLR-validated at the moment of delivery — not at last refresh.
- 03
Tele- & manual verification
A sample of records on every list is human-verified by trained agents to confirm role, employer and contact accuracy.
- 04
Suppression & dedupe
Opt-out, DNC and bounce suppression are applied before delivery, with multi-key dedupe to ensure clean ingestion into your CRM.
Data Privacy Compliance Framework
Every record on this list is filtered through global and region-specific privacy regulations before it ever reaches you.
GDPR & UK GDPR
Lawful-basis framework with documented legitimate-interest balancing tests for EEA and UK business contacts.
CCPA / CPRA
California Consumer Privacy Act compliance with opt-out routing and verifiable consumer request handling.
CAN-SPAM Act
Sender identification, opt-out support and physical address compliance applied to every record.
TCPA & DNC
Phone records scrubbed against the National DNC Registry and applicable state-level DNC lists.
CASL (Canada)
Canadian Anti-Spam Legislation applied to all Canadian contacts before delivery.
Internal controls
Encryption in transit (TLS 1.2+) and at rest (AES-256), least-privilege access, signed DPAs and SOC 2-aligned controls.
Data Sources
We never rely on a single source. This list is compiled and cross-validated from the channels actually trusted in this category.
Who Can Use Our Data Appending?
What every Data Appending delivers
Every order ships with the same operating standard — built to drop into your stack, run a quarter cleanly and stand up to scrutiny from procurement, legal and finance.
Multi-source verification
Each record is cross-validated against partner directories, public filings, professional networks and our proprietary B2B graph. Email validity, phone reachability and role accuracy are checked at the moment of delivery, not at last refresh.
CRM-ready format
Lists ship as a clean CSV plus optional direct sync into Salesforce, HubSpot, Outreach, Salesloft, Pipedrive and Apollo. Field mapping is preserved so your sequences trigger without manual cleanup or re-mapping.
Compliance posture, documented
GDPR, UK GDPR, CCPA/CPRA, CAN-SPAM, CASL, TCPA and DNC checks are applied before delivery. We sign DPAs on request and provide written compliance documentation suitable for procurement and legal review.
Replacement guarantee
Any record that hard-bounces, is unreachable or has a verified role mismatch is replaced free of charge for 90 days. The guarantee is unconditional — no support tickets, no proof required beyond the bounce log.
Continuous refresh
B2B contacts decay roughly 30% per year. We re-verify every record continuously against role-change signals, employer changes and tech-stack movement, so a list licensed in Q1 still routes pipeline cleanly in Q4.
Named operator support
Every engagement is owned by one named operator from brief to closed-won. No SDR routing, no ticket queue, no handoff — just a real person who has carried a quota and replies within one business day.
Three ways to receive your Data Appending
Pick the delivery format that fits your stack. All three options ship with the same compliance posture, the same 90-day replacement guarantee and the same named-operator support B2B Leo is known for.
Clean CSV
Standard delivery — UTF-8 CSV with preserved field mapping, suppression applied, ready to upload to any system that accepts a flat file.
Direct CRM sync
Push records straight into Salesforce, HubSpot, Outreach, Salesloft, Pipedrive or Apollo with field mapping handled end-to-end.
Secure SFTP / API
Encrypted SFTP drop or REST API delivery for enterprises with procurement-mandated transport. SOC 2-aligned controls applied.
From ICP brief to live campaign in 7 business days.
Every engagement runs on the same four-step cadence — scoped on day one, delivered by day seven, measured to closed-won every week after that.
- 01
Day 1 · Brief & scope
30-minute ICP call with a real operator (not an SDR). We lock titles, geographies, tech-stack filters, exclusion rules and suppression lists. You leave the call with a written scope and a confirmed delivery date.
- 02
Day 2–4 · Build & verify
Multi-source compile against our 180M+ B2B graph, then tele-verification on a statistically valid sample, SMTP validation on every email and phone-line testing on every direct dial. Suppression and dedupe run last.
- 03
Day 5–7 · Load & launch
Delivered as a clean CSV plus optional direct push into Salesforce, HubSpot, Outreach or Salesloft. Field mapping preserved. Sequences kick off the same day we deliver — no manual cleanup needed.
- 04
Ongoing · Measure to revenue
Weekly revenue review with one named operator. Bounces and role mismatches are replaced free of charge for 90 days. Performance is reported against pipeline and closed-won, not opens or clicks.
More in Data Solutions
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Learn moreB2B Matching Services
Match your file against our 180M+ universe.
Learn moreBusiness Phone Appending
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Learn moreCommon questions about Data Appending Services.
Can’t find yours? Email the team — we usually reply within the hour.
What's the typical match rate on a data appending project?
Match rates depend on the quality of your source file, but we typically see 60–85% match rates on well-formed B2B files. We confirm an estimated match rate before invoicing and only bill for records we successfully append.
How long does a data appending project take?
Most projects finish within 3–5 business days. Small files (under 5,000 records) often complete same-day; larger enterprise files can take 7–10 business days depending on append scope.
Is your appended data compliant with GDPR and CCPA?
Yes. All appended data is sourced from permissioned and publicly available business sources, and we apply GDPR, CCPA and CAN-SPAM rules at the record level. We provide documentation on request.
Can you append into our CRM directly?
Yes. We support direct push into Salesforce, HubSpot and most major CRMs, or you can receive a delivery file and ingest on your side.
What does data appending cost?
Pricing is per successfully appended record and varies by field type — emails and phones are most affordable, technographic and intent fields cost more. We provide a fixed quote upfront with no charges for unmatched records.
Can I see a sample before I commit?
Absolutely. We'll run a free sample append on 100 of your records so you can validate match rate and field accuracy before placing a full order.
Let's build a pipeline you can actually close.
Tell us your ICP, your goals, and one painful bottleneck. We'll come back with a concrete 30-day plan — no pitch deck, no pressure.