# Shackle funding: rounds and investors

> Shackle has raised $20M across 3 rounds since 2020. Investors include Frontline Ventures and Stripe. Every round with its source.

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

United Kingdom · [Series A startup](https://millionrounds.com/companies)

# Who invested in *Shackle*

3 rounds we have observed, with the 2 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.

Consumer Apps

Funding summary Updated 26 Oct 2026

**$20M** raised across 3 rounds since 2020, from 3 sources

**$409K** Round **$5.0M** Seed **$15M** Series A

- **Latest round:** Series A, $15M Sept 2023
- **Step-up i:** 2.9×
- **Investors:** 2

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.

2021 2022 2023

**$409K** Round

**$5.0M** Seed

**$15M** Series A

- **First round:** Round, $409K
- **Biggest round:** $15M
- **Usual gap between rounds:** 2.3 years

## The rounds

- **Sept 2023** Series A **$15M** *2 new* [Frontline Ventures](https://millionrounds.com/fund/frontline-ventures) [Stripe](https://millionrounds.com/fund/stripe) Source recorded
- **Jun 2021** Seed **$5.0M** No investor was named in the report. Shares issued, filed with Companies House (SH01); no report of this raise yet
- **Dec 2020** Round **$409K** No investor was named in the report. Shares issued, filed with Companies House (SH01); no report of this raise yet

## Funding filed with regulators

Shackle filed 3 raises, $15M in all. Filings say how much was sold and to how many investors; they never name the investors.

- Oct 2023 **$12M** UK share allotment
- Jun 2021 **$2.5M** UK share allotment
- Dec 2020 **$205K** UK share allotment

## 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.

**Round** 2020 **Seed** 2021 **Series A** 2023 [Frontline Ventures](https://millionrounds.com/fund/frontline-ventures) [Stripe](https://millionrounds.com/fund/stripe)

## Everyone who backed them

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

[Stripe](https://millionrounds.com/fund/stripe) Company **1** round

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

## Quick answers about Shackle

### Who invested in Shackle?

Shackle's investors include Frontline Ventures and Stripe.

### How much has Shackle raised?

Shackle has raised $20M across 3 rounds since 2020.

### When did Shackle last raise?

Shackle's most recent round was a Series A of $15M in Sept 2023.

### What was Shackle's biggest round?

Its most recent round, $15M in Sept 2023, is also its largest on record.

### Who backed Shackle first?

Shackle's first round on record, in Sept 2023, was backed by Frontline Ventures and Stripe.

### What stage is Shackle at?

Shackle's latest named round is a Series A, in Sept 2023.

### Where is Shackle based?

Shackle is based in the United Kingdom.

## Companies like Shackle

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

[**SafeToNet** $23M · Sept 2026](https://millionrounds.com/company/safetonet)[**Communion** $13M · Sept 2026](https://millionrounds.com/company/communion)[**Thursday** $1.5M · Sept 2026](https://millionrounds.com/company/thursday)[**Collctiv** $1.0M · Jul 2026](https://millionrounds.com/company/collctiv)[**CelluComp** $11M · Jul 2026](https://millionrounds.com/company/cellucomp)[**Whering** $7.3M · Jul 2026](https://millionrounds.com/company/whering)

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