Mike Rosengarten

General Partner, Builders VC; GP, 1121.VC (angel fund); Co-founder, OpenGov & Camino at builders-vc

Reviewed Updated May 1, 2026

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Location Nashville, TN
Check Size Builders VC: Series A leads ($10M-$22M rounds); 1121.VC: angel checks under $50K
Last Verified Investment Pursuit (Series A) — Apr 29, 2026
Social @itsmikerose LinkedIn
Stage Focus
pre-seed seed series-a
Sector Focus
b2b-saas govtech applied-ai regtech enterprise-software fintech

Background

Mike Rosengarten is a General Partner at Builders VC, an early-stage B2B SaaS, intelligent enterprise, applied AI, and regulation-tech investor 12. He joined the firm in 2025, around the launch of Builders VC’s Fund III (described in the firm’s announcement as “nearly $500 million in capital for deployment”) 2. Before joining Builders VC, Rosengarten was a co-founder of two government-software companies: OpenGov and Camino Technologies 134.

OpenGov was founded in 2012 and counted Rosengarten among its founding team alongside Zac Bookman, Joe Lonsdale, Nate Levine, and Dakin Sloss 3. According to OpenGov’s own retrospective, Rosengarten — then a senior engineer recruited by Nate Levine from Yahoo!’s advertising group — assumed the CTO role when CEO Zac Bookman refocused the company after early setbacks: “Our senior engineer Mike Rosengarten assumed the CTO role, and together we started building brick by brick” 3. As CTO and head of product, Rosengarten built and led product, engineering, and design and helped scale OpenGov from a handful of employees to roughly 100 employees and hundreds of public-sector customers 13. OpenGov was acquired by Cox Enterprises at a $1.8 billion valuation, announced February 27, 2024 — among the largest exits in public-sector software history 56.

Rosengarten next co-founded and led Camino Technologies (Camino.ai), a permitting and licensing software company for state and local governments founded in 2015 7. As CEO, he scaled Camino to more than 100 government-agency customers before its acquisition by Clariti Software, announced May 31, 2023; following the deal Rosengarten became EVP, Technology at Clariti 78. Camino’s announcement cited Rosengarten’s view of the combined company: “We have seen Clariti’s commitment to product innovation that will now include Camino. They share in our vision of delivering exceptional customer experiences, which is why we’re so excited to join forces with increased funding and support” 8.

Rosengarten holds a Computer Science degree from the University of California, Santa Barbara 1. He is based in Nashville, Tennessee 9.

Alongside his Builders VC role, Rosengarten runs 1121.VC, a small pre-seed/seed angel fund. He has publicly described 1121.VC as a vehicle for writing checks “under $50k,” that is “mostly industry agnostic,” and whose LPs are “nearly all… founders with diverse outcomes” who help portfolio founders navigate “issues like equity and term sheets” 10. The fund is contactable at “mike at 1121.vc” 10.

Stated Thesis

(Self-reported: These represent what Rosengarten and Builders VC say publicly. See Inferred Thesis below for analysis of actual investment behavior.)

Builders VC’s own description of Rosengarten’s focus areas: B2B SaaS, Intelligent Enterprise, Applied AI, and Regulation Tech 1. The firm summarizes him as “a product-driven investor… [partnering] with founders on transformative enterprise solutions” 1.

In an October 2025 statement announcing Builders VC’s $10M Series A lead in Knapsack, Rosengarten framed the AI-software opportunity this way: “AI is evolving faster than most organizations can adapt, legacy workflows are collapsing under modern demands, and the next wave of product delivery will belong to the teams that can combine speed, structure, and intelligence” 11.

For his angel fund 1121.VC, Rosengarten has stated the operating philosophy: “We like to be texted at 11pm with pressing issues. We felt that was often the most helpful thing our cap table members could do: be there for us” 10. The fund’s pitch — drawn from his founder experience — is that “[n]early all investors are founders” and the fund aims to be a founder’s “first call” on equity, term sheets, and other early-stage navigation 10.

Inferred Thesis

Sample size caveat: Builders VC does not publish a public portfolio page attributing deals to individual partners, and Rosengarten only joined the firm in 2025 12. Independently verified Builders VC-led deals attributable to Rosengarten are limited to a small number of 2025–2026 rounds. The qualitative analysis below is based on 5 verified Builders VC investments under Rosengarten’s lead (Augment, Knapsack, Pursuit) plus 3 board seats listed on his Builders VC page (Augment, ePlanSoft, Knapsack) 1111213. This sample is too small to support reliable percentage breakdowns.

Stage: Series A leads of $10M–$22M at Builders VC 111213; angel checks “under $50k” via 1121.VC, focused on pre-seed and seed 10.

Geography: US-centric. Confirmed companies (Augment, Knapsack, Pursuit, ePlanSoft, Camino, OpenGov) are US-based 17111213.

Sector observations (qualitative, not percentaged given sample size):

  • Government / regulation technology. OpenGov and Camino — both founded by Rosengarten — sit squarely in govtech, and Pursuit (his most recent Series A lead) is a data platform for selling to government 13. Builders VC’s own description of his focus areas explicitly includes “Regulation Tech” 1. ePlanSoft, where he holds a board seat, builds electronic plan-review software for public agencies 1.
  • Applied AI and intelligent enterprise. The Knapsack Series A press release describes the company as an “Intelligent Product Engine Powering AI-Driven Product Creation,” and Augment is an AI-adjacent FINRA-registered Alternative Trading System for private-market secondaries 1112. Both reflect Rosengarten’s stated “Applied AI” mandate 1.
  • B2B SaaS / enterprise software. Every Builders VC deal traced to Rosengarten is a B2B SaaS or fintech-infrastructure company 1111213.
  • Angel checks via 1121.VC are explicitly “industry agnostic” by his own description, with named bets including Vybe, Nullify, Fondo, and Stream — primarily SaaS, infrastructure, and AI per aggregator summary 910.

Founder/operator profile patterns: Rosengarten is a two-time govtech operator and selects companies where his sector knowledge and operating playbook compound: Pursuit (selling-to-government data platform), ePlanSoft (gov agency software), and Camino (his own prior company) are all in his direct operating wheelhouse 17813.

Co-investor patterns (verified): On Pursuit’s April 2026 Series A, Rosengarten led with participation from Jack Altman (Alt Capital), Bill Gurley, and Sam Hinkie (87 Capital) 13. On the Knapsack Series A, Builders VC led alongside Crosslink Capital, Epic Ventures, Mana Venture, and Lorimer Ventures 11. On the Augment Series A, Builders VC led alongside Neo, Golden Section, E1 Ventures, Corp Capital, and OPCO Ventures 12. The pattern is operator-investor co-investors (Altman, Gurley, Hinkie) on the govtech deal he led; sector-specialist funds on the AI/enterprise deals.

Notable gaps in public data. Builders VC does not publish round-level attribution, and 1121.VC’s full portfolio is not publicly indexed. Aggregator listings name additional 1121.VC bets (Vybe, Nullify, Fondo, Stream) but the announcement-level primary sources confirming round, date, and Rosengarten’s participation could not be located within this research pass and are therefore excluded from the Portfolio table 9.

Portfolio

Company Year Stage Source
Pursuit 2026-04-29 Series A (lead) 13
Augment 2025-10-22 Series A (lead) 12
Knapsack 2025-10-09 Series A (lead) 11
~unknown ePlanSoft unknown Board seat (Builders VC)
~unknown Clay Labs unknown Builders VC portfolio
~unknown LumoPath unknown Builders VC portfolio
~unknown Outlaw unknown Builders VC portfolio
~unknown Percept (acquired) unknown Builders VC portfolio
~unknown Sense360 (acquired) unknown Builders VC portfolio
Camino Technologies (founder, acq. by Clariti) 2015 (founded) — 2023-05-31 (exit) Founder 78
OpenGov (founding CTO, acq. by Cox) 2012 (founded) — 2024-02-27 (exit) Founding team 356

Limitations: The Builders VC firm page lists Augment, Camino, Clay Labs, Knapsack, LumoPath, Outlaw, Percept, and Sense360 in connection with Rosengarten but does not date these investments or specify which were post-his-arrival deals he led vs. inherited firm portfolio companies; only Augment, Knapsack, and Pursuit are independently confirmed by press releases as deals Rosengarten led or participated in directly 1111213. Round-level attribution should be added when primary sources are located.

In Their Own Words

From the Knapsack $10M Series A announcement, October 9, 2025:

“AI is evolving faster than most organizations can adapt, legacy workflows are collapsing under modern demands, and the next wave of product delivery will belong to the teams that can combine speed, structure, and intelligence.” 11

From the Augment $12M Series A announcement, October 22, 2025:

“Everyone benefits as liquidity becomes easier. Companies gain stronger alignment with their teams.” 12

From a November 2024 LinkedIn post about his angel fund 1121.VC, describing its operating posture for portfolio founders:

“We like to be texted at 11pm with pressing issues. We felt that was often the most helpful thing our cap table members could do: be there for us.” 10

From the Clariti Software acquisition of Camino Technologies, announced May 31, 2023:

“We have seen Clariti’s commitment to product innovation that will now include Camino. They share in our vision of delivering exceptional customer experiences, which is why we’re so excited to join forces with increased funding and support.” 8

What Founders Say

No independently sourced founder testimonials specifically about working with Mike Rosengarten as an investor were located in this research pass. Press releases announcing his Builders VC–led rounds (Augment, Knapsack, Pursuit) contain quotes from founders about market trends and product mission but do not include direct quotes from the founders about Rosengarten’s contribution as their investor 111213. This section should be updated as portfolio founders speak publicly about the relationship.

Connections

  • Builders VC — General Partner, joined 2025; recruited by Jim Kim, with whom Rosengarten has a 15-year relationship dating to his OpenGov CTO years; Kim has co-invested with Rosengarten across 25+ ventures per Kim’s announcement post 2.
  • 1121.VC — Founder and GP of his own pre-seed/seed angel fund; LPs are described as “nearly all… founders with diverse outcomes” 10.
  • OpenGov co-founding team — Co-founded the company in 2012 alongside Zac Bookman (CEO), Joe Lonsdale (Chairman, also of 8VC/Palantir/Addepar), Nate Levine, and Dakin Sloss 3. Acquired by Cox Enterprises at a $1.8B valuation, February 2024 56.
  • Camino Technologies — Co-founder and CEO (2015–2023); company acquired by Clariti Software, May 2023; Rosengarten became EVP, Technology at Clariti following the deal 78.
  • Board seats (current, per Builders VC firm page): Augment, ePlanSoft, Knapsack 1.
  • Verified co-investors: Jack Altman (Alt Capital), Bill Gurley, Sam Hinkie (87 Capital) on Pursuit Series A 13; Crosslink Capital, Epic Ventures, Mana Venture, Lorimer Ventures on Knapsack Series A 11; Neo, Golden Section, E1 Ventures, Corp Capital, OPCO Ventures on Augment Series A 12.
  • Former employer: Yahoo! (advertising / engineering), prior to OpenGov co-founding 3.

Sources

  1. Builders VC, “Mike Rosengarten” partner page. Accessed May 2026. https://www.builders.vc/mike-rosengarten.html↩↩↩↩↩↩↩↩↩↩↩↩↩↩↩↩

  2. Jim Kim, “Welcoming Mike Rosengarten to Builders VC,” LinkedIn post, 2025. https://www.linkedin.com/posts/jim-kim-1754b359_welcoming-mike-rosengarten-to-builders-vc-activity-7338594822166892544-Q9QR↩↩↩↩

  3. OpenGov, “Bringing the Cloud to Government.” Accessed May 2026. https://opengov.com/bringing-the-cloud-to-government/↩↩↩↩↩↩↩

  4. Signature Block on X, “GP: @itsmikerose Mike Rosengarten, CEO of Camino and ex-CTO of OpenGov, started 1121 to invest in founders at the earliest stages,” January 24, 2023. https://x.com/signatureblock_/status/1617909924851482627↩

  5. Cox Enterprises, “Cox Enterprises Acquires Majority Ownership of OpenGov,” February 27, 2024. https://www.coxenterprises.com/news/cox-enterprises-acquires-majority-ownership-of-opengov↩↩↩

  6. PR Newswire, “OpenGov Accelerates Cloud and AI Transformation of Government with Majority Investment from Cox Enterprises,” February 27, 2024. https://www.prnewswire.com/news-releases/opengov-accelerates-cloud-and-ai-transformation-of-government-with-majority-investment-from-cox-enterprises-302071912.html↩↩↩

  7. GovTech, “Clariti Buys Camino Technologies in Permitting Tech Deal,” May 31, 2023. https://www.govtech.com/biz/clariti-buys-camino-technologies-in-permitting-tech-deal↩↩↩↩↩↩

  8. Clariti Software, “Clariti Acquires Camino Technologies,” May 31, 2023. https://www.claritisoftware.com/blog/clariti-acquires-camino-technologies↩↩↩↩↩↩

  9. Ask For Funding, “Mike Rosengarten, Angel Investor — Investor in Nashville, Tennessee.” Accessed May 2026. https://askforfunding.com/investor/mike-rosengarten-angel-investor↩↩↩

  10. Mike Rosengarten, “1121.VC” LinkedIn post, November 2024. https://www.linkedin.com/posts/michaelrosengarten_1121vc-activity-7267264678014132224-nEo↩↩↩↩↩↩↩↩

  11. Knapsack, “Knapsack Raises $10M to Accelerate the Intelligent Product Engine Powering AI-Driven Product Creation,” October 9, 2025. https://www.knapsack.cloud/blog/knapsack-raises-10m-to-accelerate-the-intelligent-product-engine-powering-ai-driven-product-creation↩↩↩↩↩↩↩↩↩↩↩↩

  12. Augment, “Augment Closes $12M Series A as Private Market Trading Exceeds $60B,” October 22, 2025. https://augment.market/pulse/augment-closes-12m-series-a-as-private-market-trading-exceeds-60b↩↩↩↩↩↩↩↩↩↩↩

  13. TechCrunch, “Bill Gurley, Jack Altman back startup Pursuit, which helps companies sell to government,” April 29, 2026. https://techcrunch.com/2026/04/29/bill-gurley-jack-altman-back-startup-pursuit-which-helps-companies-sell-to-government/↩↩↩↩↩↩↩↩↩↩↩