Fundraising Fox

Ostra Cybersecurity

Eden Prairie, US · Founded 2017 · Delaware corporation · 1 known investors

Find your way into Ostra Cybersecurity

386 people in our graph share verified history with the Ostra Cybersecurity team — schools, employers, funds. One of them is your warm intro.

Kayla Hinderscheidunlockedknows Andrew Tewksbury · together at University of St. Thomas (overlapped)
×4knows the team · via Pavilion
×6knows the team · via The University of Kansas
knows the team · via University of St. Thomas

Founders & leadership

ATAndrew Tewksbury
Andrew TewksburyinChief Executive Officer2024–2026Andrew Tewksbury has spent over two decades in go-to-market leadership at PE and VC-backed B2B technology companies, managing P&L responsibility across large-scale businesses and overseeing sales, marketing, and revenue operations functions. He is now Chief Revenue Officer at Xurrent, an AI-native IT service management platform.
SD
Sean DonaldsonExecutive
MKMichael Kennedy
Michael KennedyinCSO / Founder / PresidentFounder at Blackwell Security
JJ
Joseph JohnsonNamed on SEC filing

Board

MJMichael Jennings
Michael JenningsinBoard MemberVenture Partner at Rally Ventures Management, Llc
JC
Jeffrey CowanBoard director

Investors · 1

Rally Ventures Management, Llcreported · 2 sourcesMenlo Park · $100K – $4M

Reported raises · per SEC filings

Form D private placements

$14.7M disclosed across 6 rounds · 2020–2025

▶$2.9MraisedJun 2025 · 9 investors · Other Technology
Rule 506(b)
Officers, directors & promoters on the filing
  • Andrew TewksburyExecutive Officer, Director
  • Michael KennedyExecutive Officer, Director
  • Michael JenningsDirector
  • Jeffrey CowanDirector
  • Sean DonaldsonDirector
Offering amount
$2.9M
Amount sold
$2.9M
Minimum investment
$16.2K
Proceeds to insiders
$430K
First sale
Jun 2025
Incorporated
Corporation, Delaware
Federal exemptions
06b
Full filing on SEC EDGAR ↗
▶$2.6MraisedJun 2025 · 6 investors · Other Technology
Rule 506(b)
Officers, directors & promoters on the filing
  • Michael KennedyExecutive Officer, Director
  • Sean DonaldsonDirector
  • Michael JenningsDirector
  • Andrew TewksburyExecutive Officer, Director
  • Jeffrey CowanDirector
Offering amount
$2.6M
Amount sold
$2.6M
Minimum investment
$22.6K
Proceeds to insiders
$430K
First sale
Jun 2025
Incorporated
Corporation, Delaware
Federal exemptions
06b
Full filing on SEC EDGAR ↗
▶$4.1MraisedMar 2024 · 6 investors · Other Technology
Rule 506(b)
Officers, directors & promoters on the filing
  • Sean DonaldsonDirector
  • Michael JenningsDirector
  • Michael KennedyExecutive Officer, Director
  • Jeffrey CowanExecutive Officer, Director
Offering amount
$4.1M
Amount sold
$4.1M
Proceeds to insiders
$360K
First sale
Oct 2023
Incorporated
Corporation, Delaware
Federal exemptions
04, 06b, 4a5
Full filing on SEC EDGAR ↗
▶$3.5MraisedSep 2022 · 4 investors · Other Technology
Rule 506(b)
Officers, directors & promoters on the filing
  • Michael JenningsDirector
  • Joseph JohnsonExecutive Officer, Director
  • Sean DonaldsonDirector
  • Michael KennedyExecutive Officer, Director
  • Jeffrey CowanExecutive Officer, Director
Offering amount
$3.5M
Amount sold
$3.5M
Minimum investment
$67.8K
Proceeds to insiders
$300K
First sale
Sep 2022
Incorporated
Corporation, Delaware, 2017
Federal exemptions
04, 06b, 4a5
Full filing on SEC EDGAR ↗
▶$705KraisedSep 2022 · 7 investors · Other Technology
Rule 506(b)
Officers, directors & promoters on the filing
  • Sean L. DonaldsonDirector
  • Michael KennedyExecutive Officer, Director
  • Jeffrey CowanExecutive Officer, Director
  • Joseph JohnsonExecutive Officer, Director
  • Michael JenningsDirector
Offering amount
$705K
Amount sold
$705K
Minimum investment
$25K
Proceeds to insiders
$100K
First sale
Jan 2020
Incorporated
Corporation, Delaware, 2017
Federal exemptions
04, 06b
Full filing on SEC EDGAR ↗
▶$900KraisedSep 2022 · 6 investors · Other Technology
Rule 506(b)
Officers, directors & promoters on the filing
  • Michael JenningsDirector
  • Joseph JohnsonExecutive Officer, Director
  • Jeffrey CowanExecutive Officer, Director
  • Michael KennedyExecutive Officer, Director
  • Sean DonaldsonDirector
Offering amount
$900K
Amount sold
$900K
Minimum investment
$50K
Proceeds to insiders
$100K
First sale
Aug 2021
Incorporated
Corporation, Delaware, 2017
Federal exemptions
04, 06b, 4a5
Full filing on SEC EDGAR ↗

Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.

Founder mafia

3 people who came through Ostra Cybersecurity went on to found or lead other companies.

Michael KennedyCSO / Founder / PresidentFounded Ostra Security +1Michael JenningsBoard MemberFounded BugcrowdJeremy FrieseFounding Board MemberFounded Humata Health

In the news

Ostra Cybersecurity startup raises more than $4 million in Series A - Minneapolis / St. Paul Business Journalbizjournals.com · Apr 2024Why We Invested: Ostra Cybersecurity | by Rally Ventures | Mediumrallyvc.medium.com · Feb 2023Ostra Cybersecurity - Rally Venturesrallyventures.com · Feb 2023Ostra Cybersecurity Secures Capital to Bring Fortune 100-Caliber Protection to Small and Mid-Sized Businessesprweb.com · Nov 2022Ostra Cybersecurity raises over $3.5 million - Minneapolis / St. Paul Business Journalbizjournals.com · Sep 2022

Frequently asked questions

Who are Ostra Cybersecurity's investors?
Ostra Cybersecurity's investors include Rally Ventures Management, Llc.
How much funding has Ostra Cybersecurity raised?
Ostra Cybersecurity has disclosed $14.7M raised across 6 rounds.
Where is Ostra Cybersecurity headquartered?
Ostra Cybersecurity is headquartered in Eden Prairie, US.