PTB Ventures and Accel have co-led a series A round for Callsign, an authentication platform backed by digital consultancy Reply.

The marketing discovery tool developer has come out of stealth having raised $16.3m, including $10.8m in a Gree-backed series A round.

Cybersecurity software provider 360 Enterprise Security Group was among the participants in a series A round for data security startup SkyGuard.

Spun out of Boston University by Allied Minds in December last year, Signature Medical has secured $2.5m in series A funding from investors including Bose.

Rodeo Therapeutics has developed therapies to regenerate tissue, based on research undertaken at Case Western Reserve University and University of Texas Southwestern Medical Center.

Slack Fund participated in a series A round that the virtual assistant developer will use to expand its sales and marketing teams.