United States · 
Who invested in Whistle?
Whistle's investors include Slow Ventures, DCM Ventures, Melo7 Tech Partners, Alumni Ventures and Qualcomm Ventures, and 7 more on record.
20132015201720192021
$6.0MSeries A$15MSeries B$66MSeries D$1KSeed
United States · Seed startup
Who invested in Whistle
Funding summaryUpdated 26 Oct 2026
$87Mraised across 4 rounds since 2013, from 4 sources
$6.0MSeries A$15MSeries B$66MSeries D$1KSeed
- Latest round
- Seed, $1KMar 2022
- Biggest round
- $66MSeries D · Jul 2020
- Investors
- 12
The funding story
Each circle is a round, placed by date and sized by amount. The line above is the running total.
- First round
- Series A, $6.0M Jun 2013
- Biggest round
- $66M Series D · Jul 2020
- Usual gap between rounds
- 20 months the median of 3
The rounds
- Mar 2022
- Jul 2020
- Jan 2015Series B$15M3 new1 returning
From a historical funding recordSEC filing: $15M sold, first sale Jan 2015
- Jun 2013Series A$6.0M6 new
Reported by pevc.dowjones.com
Founders and team
From Whistle's own website: 6 on the team.
- David ZeffCEO
- Yonah ZeffCOO
- Bianca GoodrichHead of Human Resources
- Bronwyn JohnsonHead of Customer Success
- Cheryl SegonHead of Finance
- Kayla du PlessisHead of GTM
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.
Series A2013Series B2015Series D2020Seed2022
Slow Ventures
DCM VenturesMelo7 Tech Partners
Alumni Ventures
Qualcomm Ventures
QueensBridge Venture Partners
Beringea
WndrCo
Nokia Growth PartnersKevin Colleran
Slow VenturesDCM VenturesMelo7 Tech PartnersAlumni VenturesQualcomm VenturesQueensBridge Venture PartnersBeringeaWndrCoNokia Growth PartnersKevin ColleranEveryone who backed them
Melo7 Tech PartnersVC firm2rounds
Kevin ColleranVC firm1round
Missing a round, or an investor who was in one? Tell us.
Quick answers about Whistle
How much has Whistle raised?
Whistle has raised $87M across 4 rounds since 2013.
When did Whistle last raise?
Whistle's most recent round was a Seed of $1K in Mar 2022.
What was Whistle's biggest round?
Whistle's largest round on record is $66M (Series D), in Jul 2020.
Who backed Whistle first?
Whistle's first round on record, in Jun 2013, was backed by Slow Ventures, DCM Ventures and Kevin Colleran and 3 others.
What stage is Whistle at?
Whistle's latest named round is a Seed, in Mar 2022.
Where is Whistle based?
Whistle is based in the United States.
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