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Signal AI Funding History

Since Signal AI was founded in 2013, it has participated in 6 rounds of funding. In total Signal AI has raised $265.1M. Signal AI's last funding round was on Sep 2025 for a total of $165.0M.

Signal AI Funding Rounds

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ROUND

FUNDING DATE

AMOUNT

NUMBER OF INVESTORS

INVESTORS

Venture Round
Sep 2025
$165M
1
Battery Ventures
Series D
Dec 2021
$50M
4
Highland Europe,  Redline Capital,  MMC Ventures Ltd,  Hearst Communications, Inc.
Series C
Oct 2019
$25M
3
Redline Capital,  MMC VENTURES LIMITED,  GMG Ventures
Series B
Jun 2018
$16M
2
GMG Ventures,  MMC Ventures
Series A
Dec 2016
$7.3M
4
MMC Ventures,  Frontline Ventures,  Reed Elsevier Ventures,  Local Globe

Total Funding: $265.1M

Signal AI Investors

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INVESTOR

ROUND

FUNDING DATE

Battery Ventures
Venture Round
Sep 2025
Highland Europe
Series D
Dec 2021
Redline Capital
Series D, Series C
Dec 2021, Oct 2019
MMC Ventures Ltd
Series D
Dec 2021
Hearst Communications, Inc.
Series D
Dec 2021

Total Investors: 11

Signal AI has 11 investors, including Battery Ventures, Highland Europe and Redline Capital. The latest investment occurred in Sep 2025.