Funding round
Island Series F
Island, which works in enterprise browser software development in Coppell, raised $400M in a Series F round announced on 24 Sep 2026, led by Evolution Equity Partners, at a $6.40B post-money valuation. 11 firms took part, 11 of them already investors. It is Island's fifth venture round on record; the one before was a Series E in Mar 2025.
$400M
Amount raised
$6.40B
Post-money valuation
11
Investors
1 lead
1.3x
Step-up from the Series E
$4.80B in Mar 2025
6.3%
Stake sold
new money over the post-money
Valuation
What this round says about the price
This round priced Island at $6.40B after the new money, 1.3 times the $4.80B of its Series E (Mar 2025). The $400M bought investors about 6.3% of the company. It came 18 months after Island's Series E. It is 38% of the $1.04B Island has raised in the venture rounds on record. No later venture round is on record for Island.
Island's funding rounds
Island has 5 venture rounds on record. This one is highlighted.
- Series B 23 Mar 2022, led by Insight Partners $115M$1.30B post-money
- Series C 23 Oct 2023, led by Prysm Capital $100M$1.50B post-money
- Series D 30 Apr 2024 $175M$3.00B post-money
- Series E 26 Mar 2025, led by Coatue $250M$4.80B post-money
- Series F this round 24 Sep 2026, led by Evolution Equity Partners $400M$6.40B post-money
Investors
Who put money in
Evolution Equity Partners led the round with 10 other firms. Evolution Equity Partners, Prysm Capital, Sequoia Capital and Coatue and 7 more had backed Island before.
Lead investor
- backs 43 venture-backed companies existing investor
Also in the round
- backs 18 venture-backed companies existing investor
- Sequoia Capital backs 589 venture-backed companies existing investor
- Coatue backs 229 venture-backed companies existing investor
- backs 21 venture-backed companies existing investor
- Insight Partners backs 548 venture-backed companies existing investor
- J.P. Morgan Growth Equity Partners existing investor
- Alta Park Capital existing investor
- backs 54 venture-backed companies existing investor
- G Squared backs 40 venture-backed companies existing investor
- Squarepoint existing investor
Use of proceeds
What the money is for
According to the announcement, the money goes to scaling operations and working capital.
- Scaling operations
- Working capital
Comparable rounds
How it compares
13 Series F rounds in Tech Companies within a year either side disclosed an amount; the median was $225M, and this round was 1.8 times the median. The closest in time, other companies' Series F rounds in Tech Companies:
| Company | Announced | Amount | Post-money | Led by |
|---|---|---|---|---|
| Tech Companies | 13 Oct 2026 | $180M | not disclosed | L Catterton and Partners Group |
| SambaNova Tech Companies | 8 Jul 2026 | $1.00B | $11.00B | General Atlantic |
| ThreatLocker Tech Companies | 29 Jul 2026 | $190M | $1.60B | Elephant |
| Supabase Tech Companies | 4 Jun 2026 | $500M | $10.50B | GIC |
| Tomorrow.io Tech Companies | 18 May 2026 | $35M | not disclosed | not named |
| Cyera Tech Companies | 8 Jan 2026 | $400M | $9.00B | Blackstone |
| Claroty Tech Companies | 22 Jan 2026 | $150M | $3.00B | Golub Growth |
| Perplexity Tech Companies | 1 Dec 2025 | $500M | $20.00B | not named |
Sources
Where this comes from
Reported by 4 sources.
Questions
Frequently asked
How much did Island raise in its Series F round?
Island raised $400M in its Series F round, announced in Sep 2026.
Who led Island's Series F round?
Evolution Equity Partners led it, with Prysm Capital, Sequoia Capital, Coatue, Cyberstarts and Insight Partners and 5 more.
What was Island's valuation at the Series F round?
$6.40B post-money.
How does it compare with other Series F rounds in Tech Companies?
13 Series F rounds in Tech Companies within a year either side disclosed an amount; the median was $225M, and this round was 1.8 times the median.