Developer of an AI-driven authentication platform designed to provide secure and adaptive authentication services.
Developer of an AI-driven authentication platform designed to provide secure and adaptive authentication services.
Network Management Software📍 London, United KingdomFounded 2010
Current Valuation
$671M
as of 2020-Q1
PRIVATE
QL Price
$693.38M
+3% vs last round
QuantLogix's current estimate for Callsign, published 2026-09-27 — in line with the last disclosed round of $671M (2020-Q1).
Confidence
medium
Basis
secondary led
What backs this price
Last disclosed round
$671M
2020-Q1
weight 0.01
Secondary market print
$693.81M
2026-06-27
weight 0.58
How this price has held up
No round has priced for Callsign since QuantLogix began publishing a price for it, so there is nothing to grade yet. The claim above is on the record from 2026-09-27 and will be graded against the next priced round. See the full accuracy record →
Which publicly-traded funds already hold it, what $10,000 buys, and whether any route is open to you.
Cite this price as QuantLogix QL Price, Callsign, 2026-09-27 (6ac70a22dcaa3c60).
The id pins this exact claim, so a citation stays checkable after the price moves.
Model estimate for research — not a quote, target price, or investment advice.
IPO Outlookprivate
Is Callsign going public?
No. Callsign is private and has not filed to go public. There is no S-1 on file.
What is Callsign's valuation in 2026?
Callsign is valued at $671M as of 2020-Q1, set by its Series B ($81M, Mar 2020). That is the last confirmed mark, not a live price — private shares do not trade continuously.
Has Callsign filed an S-1?
No public S-1 is on file for Callsign.
How much has Callsign raised?
Callsign has raised $116M in total, most recently a Series B of $81M in Mar 2020.
Is Callsign publicly traded — can you buy Callsign stock?
No. Callsign is a private company — its shares are not listed on any exchange and there is no ticker. The routes to exposure are pre-IPO secondary marketplaces and funds (accredited investors), employee tender offers when the company runs one, and public companies with read-through exposure. QuantLogix maps every route it can verify for Callsign on its Pre-IPO Access Desk.
Answers are derived from the roster record shown on this page — filing status, last round and confirmed marks. Where the record is silent, the answer says so rather than guessing.
Company Profile
Founded
2010
HQ
London, United Kingdom
Employees
312
Total Raised
$116M
Last Round
Series B — $81M (Mar 2020)
IPO Status
private
Fundraising Status
Series B · $81M · 6y 6mo ago
privateTotal raised $116M
Secondary Market
Implied price / share
$30.01
Last round price / share
$29.03
vs last round
+3.4%
Open interest
1
Last round price vs secondary price
Secondary price return by period
Implied per-share price from private secondary transactions, as of Jun 2026. This is a point estimate, not a quote — the feed carries no bid, ask or spread, and a secondary print is evidence of what someone paid on that date rather than a live market. Compare across every tracked name →
Latest Funding Round
Round
Amount
Date
Lead Investor
Post-Money
Series B
$81M
Mar 2020
—
$671M
Talent Signal
Hiring trend
▶ Hiring steady
0% vs 2026-08
Open roles
14
via careers page
Product-build share
43%
engineering, research, product, design
Trajectory
steady
balanced build + GTM — 43% builders vs 57% go-to-market/G&A — scaling both sides.
Actively hiring with no tracked executive churn.
Open roles by month
Open roles by function
■ product-building ■ go-to-market / G&A
Social engineering & scamsEngineering-Careers-two men-header-2880x1220Engineering & technologyCareers engineering-office lunch-content-900x500Careers engineering-man behind laptop-content-900x500Engineering-careers-employees on steps-content-840x1120
Counted from Callsign's live job board as of 2026-09-16; role functions classified from posting titles. Open-role counts are an activity signal, not headcount. Refreshed monthly.
Private-company numbers are not real-time. Reflects publicly disclosed valuations from press releases, news reports, and tender offers as of 2020-Q1. Refreshed quarterly.