# IsoRay Inc. (ISR)

Source: https://www.quantisnow.com/company/ISR
Generated: 2026-11-12T07:56:13.876Z

- Ticker: ISR
- Exchange: AMEX
- Sector: Health Care
- Industry: Medical Specialities
- Website: isoray.com

## About

Isoray, Inc., through its subsidiary, IsoRay Medical, Inc., develops, manufactures, and sells isotope-based medical products and devices for the treatment of cancer and other malignant diseases in the United States and internationally. The company produces CS-1 Cesium-131 brachytherapy seeds for the treatment of prostate, brain, lung, head and neck, gynecological, pelvic/abdominal, and colorectal cancers, as well as ocular melanoma. It sells its products to facilities or physician practices that utilize multiple surgical facilities at which primarily prostate brachytherapy procedures are performed. Isoray, Inc. was founded in 1998 and is headquartered in Richland, Washington.

## Latest ISR news and filings

- 2024-02-05 21:34 UTC [SEC Form 8-K] [IsoRay Inc. filed SEC Form 8-K: Other Events, Financial Statements and Exhibits](https://www.quantisnow.com/insight/isoray-inc-filed-sec-form-8-k-other-events-financial-statements-5230513)
- 2024-02-01 21:53 UTC [Insider Buy] [Williamson Robert F Iii bought $90,710 worth of shares (127,206 units at $0.71), increasing direct ownership by 60% to 338,761 units (SEC Form 4)](https://www.quantisnow.com/insight/williamson-robert-f-iii-bought-90710-worth-of-shares-127206-5224270)
- 2024-01-30 21:57 UTC [Insider Buy] [Williamson Robert F Iii bought $78,474 worth of shares (135,879 units at $0.58), increasing direct ownership by 180% to 211,555 units (SEC Form 4)](https://www.quantisnow.com/insight/williamson-robert-f-iii-bought-78474-worth-of-shares-135879-5217832)
- 2024-01-26 22:40 UTC [Insider Buy] [Puhlmann Markus bought $139,888 worth of shares (280,000 units at $0.50), increasing direct ownership by 26% to 1,375,425 units (SEC Form 4)](https://www.quantisnow.com/insight/puhlmann-markus-bought-139888-worth-of-shares-280000-units-at-5211885)
- 2024-01-26 22:38 UTC [Insider Buy] [Williamson Robert F Iii bought $25,478 worth of shares (51,996 units at $0.49), increasing direct ownership by 220% to 75,676 units (SEC Form 4)](https://www.quantisnow.com/insight/williamson-robert-f-iii-bought-25478-worth-of-shares-51996-5211879)
- 2024-01-22 21:17 UTC [SEC Form D] [SEC Form D filed by IsoRay Inc.](https://www.quantisnow.com/insight/sec-form-d-filed-by-isoray-inc-5199090)
- 2024-01-22 21:10 UTC [SEC Form 8-K] [IsoRay Inc. filed SEC Form 8-K: Entry into a Material Definitive Agreement, Other Events, Financial Statements and Exhibits](https://www.quantisnow.com/insight/isoray-inc-filed-sec-form-8-k-entry-into-a-material-5199015)
- 2024-01-18 21:49 UTC [SEC Form 424B5] [SEC Form 424B5 filed by IsoRay Inc.](https://www.quantisnow.com/insight/sec-form-424b5-filed-by-isoray-inc-5194452)
- 2024-01-17 21:44 UTC [SEC Form 8-K] [IsoRay Inc. filed SEC Form 8-K: Results of Operations and Financial Condition](https://www.quantisnow.com/insight/isoray-inc-filed-sec-form-8-k-results-of-operations-and-5191815)
- 2024-01-17 21:39 UTC [SEC Form 424B5] [SEC Form 424B5 filed by IsoRay Inc.](https://www.quantisnow.com/insight/sec-form-424b5-filed-by-isoray-inc-5191764)
- 2024-01-17 18:40 UTC [SEC Form 8-K] [IsoRay Inc. filed SEC Form 8-K: Financial Statements and Exhibits (Amendment)](https://www.quantisnow.com/insight/isoray-inc-filed-sec-form-8-k-financial-statements-and-exhibits-5190993)
- 2024-01-17 18:40 UTC [SEC Form 8-K] [IsoRay Inc. filed SEC Form 8-K: Other Events, Financial Statements and Exhibits](https://www.quantisnow.com/insight/isoray-inc-filed-sec-form-8-k-other-events-financial-statements-5190992)
- 2024-01-17 18:39 UTC [SEC Form 8-K] [IsoRay Inc. filed SEC Form 8-K: Other Events, Financial Statements and Exhibits](https://www.quantisnow.com/insight/isoray-inc-filed-sec-form-8-k-other-events-financial-statements-5190990)
- 2024-01-11 21:07 UTC [SEC Form 8-K] [IsoRay Inc. filed SEC Form 8-K: Entry into a Material Definitive Agreement, Unregistered Sales of Equity Securities, Other Events, Financial Statements and Exhibits](https://www.quantisnow.com/insight/isoray-inc-filed-sec-form-8-k-entry-into-a-material-5184127)
- 2024-01-05 21:45 UTC [SEC Form 8-K] [IsoRay Inc. filed SEC Form 8-K: Entry into a Material Definitive Agreement, Other Events, Financial Statements and Exhibits](https://www.quantisnow.com/insight/isoray-inc-filed-sec-form-8-k-entry-into-a-material-5173518)
- 2024-01-03 13:00 UTC [SEC Form 8-K] [IsoRay Inc. filed SEC Form 8-K: Other Events, Financial Statements and Exhibits](https://www.quantisnow.com/insight/isoray-inc-filed-sec-form-8-k-other-events-financial-statements-5163070)
- 2023-12-26 22:00 UTC [Insider Buy] [Williamson Robert F Iii bought $1,203 worth of shares (3,663 units at $0.33) (SEC Form 4)](https://www.quantisnow.com/insight/williamson-robert-f-iii-bought-1203-worth-of-shares-3663-5155158)
- 2023-12-20 00:11 UTC [Insider Buy] [Hunt Jonathan Robert bought $32,338 worth of shares (125,000 units at $0.26), increasing direct ownership by 65% to 316,710 units (SEC Form 4)](https://www.quantisnow.com/insight/hunt-jonathan-robert-bought-32338-worth-of-shares-125000-units-5147415)
- 2023-12-20 00:10 UTC [Insider Buy] [Williamson Robert F Iii bought $6,978 worth of shares (23,680 units at $0.29) (SEC Form 4)](https://www.quantisnow.com/insight/williamson-robert-f-iii-bought-6978-worth-of-shares-23680-5147413)
- 2023-12-20 00:09 UTC [Insider Buy] [Puhlmann Markus bought $188,737 worth of shares (595,425 units at $0.32), increasing direct ownership by 119% to 1,095,425 units (SEC Form 4)](https://www.quantisnow.com/insight/puhlmann-markus-bought-188737-worth-of-shares-595425-units-at-5147412)
- 2023-12-18 21:16 UTC [Insider Buy] [Woods Lori A bought $49,989 worth of shares (185,200 units at $0.27) (SEC Form 4)](https://www.quantisnow.com/insight/woods-lori-a-bought-49989-worth-of-shares-185200-units-5143654)
- 2023-12-15 05:15 UTC [SEC Form EFFECT] [SEC Form EFFECT filed by IsoRay Inc.](https://www.quantisnow.com/insight/sec-form-effect-filed-by-isoray-inc-5139398)
- 2023-12-14 23:44 UTC [SEC Form 4] [SEC Form 4 filed by Puhlmann Markus](https://www.quantisnow.com/insight/sec-form-4-filed-by-puhlmann-markus-5139176)
- 2023-12-14 23:42 UTC [SEC Form 4] [SEC Form 4 filed by Spoor Johan M.](https://www.quantisnow.com/insight/sec-form-4-filed-by-spoor-johan-m-5139172)
- 2023-12-14 23:36 UTC [SEC Form 4] [SEC Form 4 filed by Hunt Jonathan Robert](https://www.quantisnow.com/insight/sec-form-4-filed-by-hunt-jonathan-robert-5139165)
- 2023-12-14 23:34 UTC [SEC Form 4] [SEC Form 4 filed by Morich Frank](https://www.quantisnow.com/insight/sec-form-4-filed-by-morich-frank-5139161)
- 2023-12-14 23:32 UTC [SEC Form 4] [SEC Form 4 filed by Williamson Robert F Iii](https://www.quantisnow.com/insight/sec-form-4-filed-by-williamson-robert-f-iii-5139160)
- 2023-12-14 23:30 UTC [SEC Form 4] [SEC Form 4 filed by Henson Heidi](https://www.quantisnow.com/insight/sec-form-4-filed-by-henson-heidi-5139156)
- 2023-12-14 23:28 UTC [SEC Form 4] [SEC Form 4 filed by Woods Lori A](https://www.quantisnow.com/insight/sec-form-4-filed-by-woods-lori-a-5139148)
- 2023-12-12 13:05 UTC [SEC Form 8-K] [IsoRay Inc. filed SEC Form 8-K: Entry into a Material Definitive Agreement, Other Events, Financial Statements and Exhibits](https://www.quantisnow.com/insight/isoray-inc-filed-sec-form-8-k-entry-into-a-material-5131841)
- 2023-12-08 21:11 UTC [SEC Form 8-K] [IsoRay Inc. filed SEC Form 8-K: Other Events, Financial Statements and Exhibits](https://www.quantisnow.com/insight/isoray-inc-filed-sec-form-8-k-other-events-financial-statements-5127638)
- 2023-12-07 00:42 UTC [SEC Form S-3] [SEC Form S-3/A filed by IsoRay Inc. (Amendment)](https://www.quantisnow.com/insight/sec-form-s-3a-filed-by-isoray-inc-amendment-5123678)
- 2023-12-06 21:10 UTC [SEC Form 8-K] [IsoRay Inc. filed SEC Form 8-K: Entry into a Material Definitive Agreement, Financial Statements and Exhibits](https://www.quantisnow.com/insight/isoray-inc-filed-sec-form-8-k-entry-into-a-material-5122607)
- 2023-11-28 21:11 UTC [SEC Form 8-K] [IsoRay Inc. filed SEC Form 8-K: Other Events, Financial Statements and Exhibits](https://www.quantisnow.com/insight/isoray-inc-filed-sec-form-8-k-other-events-financial-statements-5106714)
- 2023-11-17 22:07 UTC [SEC Form 8-K] [IsoRay Inc. filed SEC Form 8-K: Entry into a Material Definitive Agreement, Financial Statements and Exhibits](https://www.quantisnow.com/insight/isoray-inc-filed-sec-form-8-k-entry-into-a-material-5093876)
- 2023-11-17 21:40 UTC [SEC Form S-3] [SEC Form S-3 filed by IsoRay Inc.](https://www.quantisnow.com/insight/sec-form-s-3-filed-by-isoray-inc-5093618)
- 2023-11-15 21:50 UTC [SEC Form 424B5] [SEC Form 424B5 filed by IsoRay Inc.](https://www.quantisnow.com/insight/sec-form-424b5-filed-by-isoray-inc-5088098)
- 2023-11-14 21:59 UTC [SEC Form 10-Q] [SEC Form 10-Q filed by IsoRay Inc.](https://www.quantisnow.com/insight/sec-form-10-q-filed-by-isoray-inc-5085319)
- 2023-10-12 20:47 UTC [SEC Form 8-K] [IsoRay Inc. filed SEC Form 8-K: Leadership Update, Submission of Matters to a Vote of Security Holders, Financial Statements and Exhibits](https://www.quantisnow.com/insight/isoray-inc-filed-sec-form-8-k-leadership-update-submission-of-5018012)
- 2023-09-19 01:20 UTC [SEC Schedule 13G] [SEC Form SC 13G filed by IsoRay Inc.](https://www.quantisnow.com/insight/sec-form-sc-13g-filed-by-isoray-inc-4976784)

## More

- Live page with ratings, short volume, options and peers: https://www.quantisnow.com/company/ISR
- Earnings history: https://www.quantisnow.com/earnings/ISR
- Dividend history: https://www.quantisnow.com/dividends/ISR
- Insider transactions: https://www.quantisnow.com/insiders/ISR
- Options chain: https://www.quantisnow.com/options/ISR
- SEC 8-K filings only: https://www.quantisnow.com/company/ISR/8-k
- RSS and alerts for ISR: https://www.quantisnow.com/docs/rss-feeds.md