---
title: "September 17–18 Investment News: Crusoe $3.9B, MIND $72M, Kastle $24M"
description: "Day index for September 17–18, 2026: Crusoe’s confirmed $3.9B Series F at $30.9B, MIND $72M DLP Series B, Comp AI $34M, Kastle $24M, Magentic $18M — plus Treble and Graph AI briefs."
date: 2026-09-18T00:00:00.000Z
source: https://venturecapitaltracker.com/2026-september-17-18-investment-news-crusoe-mind-kastle
---

# September 17–18 Investment News: Crusoe $3.9B, MIND $72M, Kastle $24M

> Day index for September 17–18, 2026: Crusoe’s confirmed $3.9B Series F at $30.9B, MIND $72M DLP Series B, Comp AI $34M, Kastle $24M, Magentic $18M — plus Treble and Graph AI briefs.

**September 17–18, 2026** tape: one company-confirmed neocloud mega-round, then a cluster of AI ops / security Series A–B closes. Deep dives link from the table below.

## Primaries

| Date | Company | Amount | Stage | Lead / note | Memo |
| --- | --- | --- | --- | --- | --- |
| Sep 17 | [Crusoe](/startup/crusoe) | **$3.9B** at **$30.9B** | Series F | Atreides + Mubadala + Valor. [Founders Fund](/fund/founders-fund), Nvidia, [Ribbit](/fund/ribbit-capital). Supersedes Sep 3 **reported** ~$3B / ~$30B. | [Crusoe memo](/2026-crusoe-3-9b-series-f-30-9b) |
| Sep 17 | [MIND](/startup/mind-security) | **$72M** | Series B | Crosspoint. **$112M** total. Ctech: ~**$300M** / ~**$10M** ARR (reported). | [MIND memo](/2026-mind-72m-series-b-crosspoint-dlp) |
| Sep 17 | [Comp AI](/startup/comp-ai) | **$34M** | Series A | Roo + Grand. **>1,000** customers; **15×** ARR growth claimed; no absolute ARR. | [Comp AI memo](/2026-comp-ai-34m-series-a-roo-grand-compliance) |
| Sep 17 | [Kastle](/startup/kastle) | **$24M** | Series A | [Insight](/fund/insight-partners). [YC](/fund/y-combinator) returning. **>$1.8B–$2B** txns claimed. | [Kastle memo](/2026-kastle-24m-series-a-insight-lending-ai) |
| Sep 17 | [Magentic](/startup/magentic) | **$18M** | Series A | Felicis; [Sequoia](/fund/sequoia) returning. Global 500 procurement agents. | [Magentic memo](/2026-magentic-18m-series-a-felicis-sequoia-procurement) |

## Briefs

| Date | Item | Note |
| --- | --- | --- |
| Sep 17–18 | **Treble** **$18M** Series A-2 | Iceland voice/acoustics sim; Paladin led extension. Amazon/Logitech named as customers in secondary press. Lifetime figures mix currencies — treat carefully. Brief only. |
| Sep 10 | **Graph AI** **$13.3M** Series A | Insight led; Bessemer returning. Pharmacovigilance / patient-safety OS. Dated Sep 10 — brief only here. |
| Sep 17 | **syte** **€9M** Series A | amberra — below standalone bar; roundup only. |

## How to read the Crusoe confirmation

September 3 Bloomberg/TechCrunch coverage was **reported**. September 17 is **company-disclosed** **$3.9B / $30.9B** with three named co-leads and **$140B+** TCV / **6 GW** contracted claims. Keep Jane Street’s **~$13B** contract labeled Bloomberg-reported unless Crusoe restates it.

## Fund pages used

- [/fund/founders-fund](/fund/founders-fund) · [/fund/ribbit-capital](/fund/ribbit-capital)
- [/fund/insight-partners](/fund/insight-partners) · [/fund/y-combinator](/fund/y-combinator)
- [/fund/sequoia](/fund/sequoia)

**Not linked as `/fund/`:** Atreides, Mubadala Capital, Valor Equity, Crosspoint, Roo Capital, Grand Ventures, Felicis, Westly, Commerce Ventures, Fifth Wall, Paladin, amberra.

## Related

Month hub: [/2026-september-vc-news](/2026-september-vc-news). Prior Crusoe tape: [/2026-crusoe-3b-30b-valuation-jane-street](/2026-crusoe-3b-30b-valuation-jane-street).

### Sources

1. Crusoe GlobeNewswire — Series F
2. MIND / Kastle / Magentic PR Newswire; Comp AI press page
3. TechCrunch Crusoe; TNW Comp AI / Magentic; Ctech MIND

**By:** [Venture Capital Tracker](https://venturecapitaltracker.com/editorial-policy)

**Editorial note:** AI tools assisted with research, structure, or drafting. Venture Capital Tracker retains human editorial responsibility for factual accuracy, relevance, and source quality before publication.