# Opine funding: rounds and investors

> Opine has raised $5.5M across 2 rounds since 2025. Investors include Y Combinator, Triangle Tweener Fund and S3 Ventures. Every round with its source.

Source: https://millionrounds.com/company/opine (Millionrounds; every figure on the page links to its filing or article)

United States · [Seed startup](https://millionrounds.com/companies)

# Who invested in *Opine*

2 rounds we have observed, with the 3 investors named in them. Every figure came from a named source, and where the company reported a raise to the SEC itself, that is shown beside it.

Financial Services

Raised 11 months ago

Funding summary Updated 26 Oct 2026

**$5.5M** raised across 2 rounds since 2025, from 2 sources

**$500K** Pre-seed **$5.0M** Seed

- **Latest round:** Seed, $5.0M Dec 2025
- **Step-up i:** 10×
- **Investors:** 3

See who backed them

## The funding story

Each circle is a round, placed by date and sized by amount. The line above is the running total.

2026

**$500K** Pre-seed

**$5.0M** Seed

- **First round:** Pre-seed, $500K
- **Biggest round:** $5.0M
- **Between rounds:** 9 months

## The rounds

- **Dec 2025** Seed **$5.0M** *2 new* [Triangle Tweener Fund](https://millionrounds.com/fund/triangle-tweener-fund) [S3 Ventures](https://millionrounds.com/fund/s3-ventures) Source recorded
- **Mar 2025** Pre-seed **$500K** *1 new* [Y Combinator](https://millionrounds.com/fund/y-combinator) Source recorded

## Who was in which round

The busiest backers across the latest rounds. A filled square is a round they joined; a dark one, a round they led.

**Pre-seed** 2025 **Seed** 2025 [Y Combinator](https://millionrounds.com/fund/y-combinator) [Triangle Tweener Fund](https://millionrounds.com/fund/triangle-tweener-fund) [S3 Ventures](https://millionrounds.com/fund/s3-ventures)

## Everyone who backed them

[Y Combinator](https://millionrounds.com/fund/y-combinator) Accelerator **1** round

[Triangle Tweener Fund](https://millionrounds.com/fund/triangle-tweener-fund) VC firm **1** round

[S3 Ventures](https://millionrounds.com/fund/s3-ventures) VC firm **1** round

Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=opine).

## Quick answers about Opine

### Who invested in Opine?

Opine's investors include Y Combinator, Triangle Tweener Fund and S3 Ventures.

### How much has Opine raised?

Opine has raised $5.5M across 2 rounds since 2025.

### When did Opine last raise?

Opine's most recent round was a Seed of $5.0M in Dec 2025.

### What was Opine's biggest round?

Its most recent round, $5.0M in Dec 2025, is also its largest on record.

### Who backed Opine first?

Opine's first round on record, in Mar 2025, was backed by Y Combinator.

### What stage is Opine at?

Opine's latest named round is a Seed, in Dec 2025.

### Where is Opine based?

Opine is based in the United States.

## Companies like Opine

In the same sector, and raised in the last eighteen months.

[**xPay** $1.5M · Oct 2026](https://millionrounds.com/company/xpay)[**Kalshi** $2.7B · Oct 2026](https://millionrounds.com/company/kalshi)[**STRIVE** $1.3B · Oct 2026](https://millionrounds.com/company/strive)[**CapitalOS** $52M · Oct 2026](https://millionrounds.com/company/capitalos)[**Platform Accounting Group** $355M · Oct 2026](https://millionrounds.com/company/platform-accounting-group)[**Ramp** $4.5B · Oct 2026](https://millionrounds.com/company/ramp)

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