Polyphron
An AI-guided tissue-engineering platform that grows human micro-tissues and models their responses to support drug research and development.
$20MSeed
ParticipantH
Haystack
haystack.vc ↗Activity from announced rounds
Activity in this selectionUnited States · Oct 4, 2026 · Jul 7, 2026
Early-stage software and technology investor, with recorded activity in structured-data models, privacy infrastructure and tissue engineering.
Investing in the first stages
Haystack is an early-stage venture capital firm investing in the first stages of software and technology companies. The firm says its typical initial investment is $1 million to $3 million and that it can lead or join a round. Its approach starts with founders rather than a fixed sector checklist.
Activity recorded on RoundOS
The public RoundOS history includes Synthefy’s structured-data models, Integral Privacy Technologies’ data-privacy infrastructure and Polyphron’s human-tissue engineering platform. Those recorded participations provide examples of the firm’s activity; the list is a bounded database selection.
- Rounds participated in
- 2
- Confirmed lead rounds
- 0 All roles disclosed
- New companies
- 2 First participation on record · 0 follow-on
- Funding in participating rounds
- $26.5M 2 disclosed · full round size, not this investor’s share
By stage
By primary sector
By country
Rounds
2 in this selectionSynthefy
Synthefy builds foundation models that generate predictions from structured data without requiring task-specific training. The models are designed for datasets such as business tables and time series, where teams need forecasts from organized numerical and categorical information.
$6.5MSeed
Participant