# CastBox funding: rounds and investors > CastBox has raised $45M across 3 rounds since 2017. Investors include Qiming Venture Partners, GSR and ZhenFund. Every round with its source. Source: https://millionrounds.com/company/castbox (Millionrounds; every figure on the page links to its filing or article) United States · [Series C startup](https://millionrounds.com/companies) # Who invested in *CastBox* 3 rounds we have observed, with the 6 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. Entertainment Internet Funding summary Updated 26 Oct 2026 **$45M** raised across 3 rounds since 2017, from 3 sources **$16M** Round **$14M** Series B **$15M** Series C - **Latest round:** Series C, $15M Apr 2021 - **Biggest round:** $16M Round · Oct 2017 - **Investors:** 6 (1 led) 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. 2018 2019 2020 2021 **$16M** Round **$14M** Series B **$15M** Series C - **First round:** Round, $16M - **Biggest round:** $16M - **Usual gap between rounds:** 2.9 years ## The rounds - **Apr 2021** Series C **$15M** *1 new* *3 returning* [Qiming Venture Partners](https://millionrounds.com/fund/qiming-venture-partners) [IDG Capital](https://millionrounds.com/fund/idg-capital) [GSR](https://millionrounds.com/fund/gsr) [ZhenFund](https://millionrounds.com/fund/zhenfund) Source recorded - **Apr 2018** Series B **$14M** *1 new* *2 returning* SIG China/ IDG Lead [Qiming Venture Partners](https://millionrounds.com/fund/qiming-venture-partners) [GSR](https://millionrounds.com/fund/gsr) Reported by TechCrunch - **Oct 2017** Round **$16M** *4 new* [Qiming Venture Partners](https://millionrounds.com/fund/qiming-venture-partners) [GSR](https://millionrounds.com/fund/gsr) [ZhenFund](https://millionrounds.com/fund/zhenfund) IDG Capital/ SIG China Reported by FinSMEs ## 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** 2017 **Series B** 2018 **Series C** 2021 [Qiming Venture Partners](https://millionrounds.com/fund/qiming-venture-partners) [GSR](https://millionrounds.com/fund/gsr) [ZhenFund](https://millionrounds.com/fund/zhenfund) SIG China/ IDG L [IDG Capital](https://millionrounds.com/fund/idg-capital) IDG Capital/ SIG China ## Everyone who backed them [Qiming Venture Partners](https://millionrounds.com/fund/qiming-venture-partners) VC firm **3** rounds [GSR](https://millionrounds.com/fund/gsr) VC firm **3** rounds [ZhenFund](https://millionrounds.com/fund/zhenfund) VC firm **2** rounds SIG China/ IDG no record of our own yet **1** round, led 1 [IDG Capital](https://millionrounds.com/fund/idg-capital) Private equity **1** round IDG Capital/ SIG China no record of our own yet **1** round Missing a round, or an investor who was in one? [Tell us](https://millionrounds.com/corrections?slug=castbox). ## Also claim to have backed them This firm lists CastBox as a portfolio company on their own website, but no report of a round names it. They are the firms' own claims, kept apart from the rounds above. [upside.fm](https://millionrounds.com/fund/upside-fm) VC firm Per its own site ## Quick answers about CastBox ### Who invested in CastBox? CastBox's investors include Qiming Venture Partners, GSR, ZhenFund, SIG China/ IDG and IDG Capital, and 1 more on record. ### How much has CastBox raised? CastBox has raised $45M across 3 rounds since 2017. ### When did CastBox last raise? CastBox's most recent round was a Series C of $15M in Apr 2021. ### What was CastBox's biggest round? CastBox's largest round on record is $16M (Undisclosed round), in Oct 2017. ### Who backed CastBox first? CastBox's first round on record, in Oct 2017, was backed by Qiming Venture Partners, GSR and ZhenFund and 1 others. ### What stage is CastBox at? CastBox's latest named round is a Series C, in Apr 2021. ### Where is CastBox based? CastBox is based in the United States. ### Who led CastBox's rounds? SIG China/ IDG led the Series B in 2018. ## Companies like CastBox In the same sector, and raised in the last eighteen months. [**Pika** $216M · Oct 2026](https://millionrounds.com/company/pika)[**Whop** $400M · Oct 2026](https://millionrounds.com/company/whop)[**Tolan** $30M · Oct 2026](https://millionrounds.com/company/tolan)[**Clueso** $11M · Oct 2026](https://millionrounds.com/company/clueso)[**Welltory** $4.0M · Oct 2026](https://millionrounds.com/company/welltory)[**Gardens Interactive** $35M · Oct 2026](https://millionrounds.com/company/gardens-interactive) ## Find investors like these Search every investor by what they have actually funded, then narrow to your stage and market. Free. Open the investor searchOr these rounds in the app