Justin Caldbeck
San Francisco, United States
Justin Caldbeck is a Co-Founder and Managing Partner at Binary Capital since July 2014. In June 2017, Justin announced an indefinite leave of absence from Binary Capital.Previously, Justin was a Managing Director at Lightspeed Venture Partners from January 2011 to June 2014. Justin invested primarily in the Internet and mobile sectors with afocus on social media, e-commerce and enterprise software. Justin’s past investments include Bloomreach, GrubHub, PetFlow and TaskRabbit. Justin has also been a Board Member or Board Observer for numerous successful companies including TheFind, INRIX, Adready, Magazine Radar, Oyster.com and DNA Games. Before joining Lightspeed, Justin was a Partner at Bain Capital Ventures and was responsible for launching the firm’s West Coast office. Justin was both a Member of the Board of Directors and Board Observer for a wide variety of consumer internet, enterprise software, and business services companies, including BloomReach, TheFind, Adready, INRIX, DNA Games, Oyster.com, and Magazine Radar. Before Bain Capital Ventures, Justin was at McKinsey and Co. where he served consumer and media companies in a wide range of capacities. Justin holds a B.A. in Economics from Duke University and an MBA from Harvard Business School.
- Total investments:
- 24
- Last investment:
- Lead investor:
- 25%
Last updated:
For AI agents: llms.txt
Industries Justin Caldbeck invests in
Stages Justin Caldbeck invests in
Countries Justin Caldbeck invests in
Round sizes
Contacts
| Type | Contact | Validation |
|---|---|---|
| Work email | ||
| Personal email | ||
| Work phone | ||
| Personal phone | ||
| Socials |
Round size
- Seed
- $300k–$6.5M
- Series A
- $4.8M–$10M
- Series B
- $4M–$18M
Investment Focus
Industry
- E-Commerce 7 (29%)
- Mobile 5 (21%)
- iOS 3 (13%)
- Transportation 3 (13%)
- Artificial Intelligence 3 (13%)
Stage
- Seed 7 (29%)
- Series A 5 (21%)
- Series B 4 (17%)
- Series C 4 (17%)
- Pre-Seed 2 (8%)
Country
- United States 13 (54%)
- India 4 (17%)
- Kenya 1 (4%)
Investments
| Company | Description | Round | Links |
|---|---|---|---|
| The serverless context infra built with in-memory data stores: ultra low latency, highest precision recall, and relationally-aware. Build memory layers, stateful agents, and context stores with the highest accuracy. | $6.5M / Seed / Mar 12, 2026 | ||
| Finsire builds lending enablement services by permitting digital assets to be taken as collateral. | $1.3M / Seed / Mar 15, 2023 | ||
| Flippy is a financial platform that simplifies crypto investments through thematic investments. | $1.2M / Seed / Apr 19, 2022 | ||
| Big.Jobs is a Copilot that works alongside you, guiding you every step of the way, and picking up all the manual tasks to deliver high-performance recruitment for your open positions. Big.Jobs provides copilot hiring services to assist with employment. | Pre-Seed / Mar 30, 2022 | ||
| Get your customers to get you customers. Get in touch if you're a restaurant, bar, or retail store to discover how Kaching can radically transform your word-of-mouth! | $300K / Seed / Jan 11, 2021 | ||
| Bwala Africa Logistics ( Bwala Africa Group Limited) is an emerging markets Crowdsourcing logistics marketplace focusing on last mile order fulfilment . | Pre-Seed / Feb 16, 2019 | ||
| Quartzy provides the only complete solution for lab management that includes the world’s most comprehensive catalog of more than 3M lab supplies and deals backed by 1,000's of top suppliers. Trusted by 200,000 scientists across 13,000 labs nationwide, Quartzy streamlines inventory and purchasing communications to save labs time and money. | $17M / Series B / Jan 04, 2016 | ||
| Flogg is an online platform that enables individuals to buy and sell with their loved ones and friends. It is available on the iOS platform. Flogg was launched by Ben Pasternak in September 2015 and is operated in New York. | Seed / Sep 14, 2015 | ||
| Luxe is building a logistics platform that will drive the next generation of local real time services, beginning with parking. The free Luxe app, available on iPhone, transforms parking from a necessary evil to a daily highlight. With a veteran team of leaders from Zynga, Tesla, Google, Yahoo and Groupon, a fleet of prescreened, friendlyvalets, dozens of insured and secure indoor parking lots and a sophisticated technology platform that monitors every step of the process from drop-off to pick-up, Luxe is leading the charge on a new industry of on demand services that addresses a ubiquitous urban challenge: parking. | $5.5M / Seed / Oct 23, 2014 | ||
| Stitch Fix is a personal styling platform that delivers curated and personalized apparel and accessory items for women. Founded in 2011, the company is headquartered in San Francisco, California, United States. | $25M / Series C / Jun 10, 2014 | ||
| See all 24 investments → | |||
Co-Investors
Lightspeed Venture Partners is a venture capital firm that engages in consumer, enterprise, technology, and cleantech markets. It focuses on seed, early-stage, later-stage, expansion-stage, start-ups, growth companies, and incubation, and specializes in debt financing for start-ups and growth companies.Lightspeed Venture Partners invests invarious sectors that include enterprise, consumer, big data, bitcoin, enterprise technology, cleantech, mobile, internet, financial technology, cloud solutions, e-commerce, storage, media, networking, energy, and software, software-as-a-service, information technology, biotechnology, and social.
Lightspeed Venture Partners Contacts
| Name | Phone | Socials | |
|---|---|---|---|
Arsham Memarzadeh
Partner
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Galym Imanbayev
Partner
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James Ephrati
Partner
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Justin Overdorff
Partner
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Michael Mignano
Partner
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FAQ
What does Justin Caldbeck invest in?
Justin Caldbeck invests primarily in E-Commerce, Mobile and iOS startups, most often at Seed and Series A stage. Most of the 24 investments tracked by Shizune back companies in United States. The Investment Focus section breaks down every industry, stage and country in the portfolio.
What is Justin Caldbeck's check size?
Justin Caldbeck typically joins rounds of $300k–$6.5M at Seed, $4.8M–$10M at Series A and $4M–$18M at Series B. These ranges are 10th–90th percentile round sizes calculated from confirmed public funding rounds, so they are a realistic guide to the rounds Justin Caldbeck participates in.
How do I contact Justin Caldbeck?
Public channels for Justin Caldbeck include LinkedIn, X (Twitter) and Facebook. For a verified work email and phone number, create a free Shizune account — contact data is searched across 20+ sources and validated before delivery, so your outreach lands in the right inbox.
When did Justin Caldbeck last invest?
The most recent investment recorded for Justin Caldbeck closed in Mar 2026. Shizune tracks 24 investments in total for this profile, including round sizes, stages and portfolio companies, all sourced from confirmed public funding rounds and refreshed monthly.
Is Shizune's investor data accurate?
Yes — every stat on this profile is calculated from confirmed public funding rounds monitored across hundreds of sources since 2020. This profile was last refreshed in Aug 2026 and is updated monthly. Spotted something off? Use the “Suggest an edit” link near the top of the page.
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