When was Protom International founded?

Protom International was founded in 2008 and raised its 1st funding round 1 year after it was founded.

Where is Protom International located?

Protom International is headquartered in Flower Mound, United States.

How many employees does Protom International have?

As of Jun 30, 2026, the latest employee count at Protom International is 21.

Is Protom International a funded company?

Protom International is a funded company, having raised a total of $61.8M across 4 funding rounds to date. The company's 1st funding round was a $***** Seed round, raised on Apr 30, 2009.

When was the latest funding round of Protom International?

Protom International's latest funding was a $***** Series A round on Mar 2017, with participation from 1 investor.

Where does Protom International rank among its competitors?

Protom International ranks 23rd amongst 66 active competitors, of which 20 are funded. It stands 6th in terms of total funding among its competitors. The most recent competitor to raise funding was EmpNia, which secured $9.1M in Nov, 2025.

Who are the top competitors of Protom International?

Protom International's top competitors include RefleXion, Alpha Tau Medical and Mevion Medical Systems. Among them, EmpNia secured the most recent funding round in November, 2025.

Protom International - 2026 Company Profile, Funding & Competitors

Company Details

Protom has developed a proton beam radiation therapy system, Radiance 330, for the treatment of cancer. It has received 510(k) clearance for Radiance 330. Proton radiation therapy can be really helpful in treating tumors close to critical structures because of the high degree of accuracy.

Website: www.protominternational.com/
Email ID: *****@protominternational.com

Key Metrics

Founded Year

2008

Location

Flower Mound, United States

Stage

Series A

Total Funding

$61.8M in 4 rounds

Latest Funding Round

Series A, Mar 2017, $*****

Investors

Michaelson Capital Partners

Ranked

23^rd among 66 active competitors

Employee Count

21 as on Jun 30, 2026

Similar Companies

RefleXion & 78 more

View Protom International's full profile

Protom International is associated with 2 legal entities given below:

Legal Entity Name	Date of Incorporation	Revenue	Latest Employee Count	Documents
PROTOM INTERNATIONAL, INC. CIN: 262395894 , United States, Active	Dec 31, 1999	$5M - $25M (As on Mar 01, 2013)	34 (As on Dec 31, 2014)	-
ProTom International Holding Corporation. CIN: 47-4812361 , United States, Active		-	40 (As on Dec 31, 2021)	-

Protom International has raised a total funding of $61.8M over 4 rounds. Its first funding round was on Apr 30, 2009. Its latest funding round was a Series A round on Mar 2017 for $*****. 1 investor participated in its latest round. Protom International has 1 institutional investor.

Here is the list of recent funding rounds of Protom International:

Filter this list

Date of Funding	Funding Amount	Round Name	Post-Money Valuation	Revenue Multiple	Lead Investors	Other Investors
Mar 2017	2402422	Series A	7196335	8501487	3419776	8408863
Aug 2016	8773157	Series A	1950272	4894185	9040989	8122044
Mar 01, 2013	3498696	Seed	4532356	1419652	9818584	3921068

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View details of Protom International's funding rounds and investors

Protom International's employee count trend

Protom International has 21 employees as of Jun 26. Here is Protom International's employee count trend over the years:

Employee count trend for Protom International

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Top competitors of Protom International include RefleXion, Alpha Tau Medical and Mevion Medical Systems. Here is the list of Top 10 competitors of Protom International, ranked by Tracxn score:

Rank	Company Details	Short Description	Total Funding	Investors	Tracxn Score
1st	RefleXion 2009, Hayward (United States), Series F	Provider of biology-guided radiotherapy system	$542M	The Rise Fund, PSP Investments & 24 others	70/100
2nd	Alpha Tau Medical 2015, Tel Aviv (Israel), Public	Developer of radiotherapy technique for the treatment of solid cancer tumors	$55M	Shavit Capital, OurCrowd & 15 others	66/100
3rd	Mevion Medical Systems 2004, Littleton (United States), Series F	Proton therapy systems for oncology	$500M	ProQuest Investments, Yuan Ming Capital & 9 others	60/100
4th	Alpheus Medical 2014, Chanhassen (United States), Series B	Developer of Sonodynamic therapy device for brain cancer	$68M	Samsara BioCapital, Orbimed & 7 others	58/100
5th	ZAP-X 2014, San Carlos (United States), Series E	Developer of gyroscopic radiosurgery platform	$160M	Primavera, Foxconn Electronics & 6 others	57/100
6th	ABK Biomedical 2012, Halifax (Canada), Series D	Developer of imageable embolic medical devices targeting benign and malignant hypervascular tumors	$140M	Varian Medical Systems, F-Prime Capital & 8 others	55/100
7th	Cel-Sci 1983, Vienna (United States), Public	Developer of immunotherapy products for the treatment of cancer and infectious diseases	-	Alpha Capital Partners, Midsummer Capital ... & 7 others	53/100
8th	AiRato 2022, Sendai (Japan), Seed	AI-powered radiation therapy platform for cancer treatment	$4.88M	FFG Venture Business Partners, MTG Ventures ... & 8 others	50/100
9th	Sirtex Medical 1991, Sydney (Australia), Public	Developer of radiation therapy for the treatment of cancer	-	CVC, China Merchants Capital	47/100
10th	EmpNia 2020, Eden Prairie (United States), Series B	Developer of precision imaging and radiation therapy for the treatment of cancer patients	$12.2M	-	46/100
23rd	Protom International 2008, Flower Mound (United States), Series A	Proton radiotherapy system	$61.8M	Michaelson Capital Partners	31/100