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Non-Invasive Monitoring extends four notes to Oct. 31, 2026

All four notes now mature on October 31, 2026, and their other provisions remain unchanged.

(Moderate)

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Form Type
8-K

Rhea-AI Filing Summary

Non-Invasive Monitoring Systems, Inc. (NIMU) amended four promissory notes, each with a principal amount of $75,000, moving their maturity dates from September 30, 2026 to October 31, 2026. The lenders are Frost Gamma Investments Trust, controlled by current director Dr. Phillip Frost, and Dr. Jane Hsiao, the company’s chairman and interim chief executive officer; each is identified as a beneficial owner of more than 10% of the company’s common stock. No other provisions were amended.

Item 1.01 Entry into a Material Definitive Agreement Business
The company signed a significant contract such as a merger agreement, credit facility, or major partnership.
Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement Financial
The company incurred a new significant debt or off-balance-sheet obligation.
Item 9.01 Financial Statements and Exhibits Exhibits
Financial statements, pro forma financial information, or exhibit attachments filed with this report.
2021 Frost Gamma Note principal amount $75,000 Promissory note dated October 4, 2021
2021 Hsiao Note principal amount $75,000 Promissory note dated October 4, 2021
2022 Frost Gamma Note principal amount $75,000 Promissory note dated September 16, 2022
2022 Hsiao Note principal amount $75,000 Promissory note dated September 16, 2022
Amended maturity date October 31, 2026 Maturity date for all four notes, changed from September 30, 2026
Promissory Note financial
"Fifth Amendment to ... Promissory Note"
A promissory note is a written IOU in which one party promises to pay a specific sum, often with interest, to another party by a set date or on demand. Investors care because it functions like a loan: it creates a legal claim on future cash flows, carries credit and timing risk, and can affect valuation or liquidity—think of it as a formal, tradable promise to be repaid that can be assessed like any other debt investment.
principal amount financial
"in the principal amount of $75,000"
The principal amount is the original sum of money that is borrowed, lent, or invested before any interest, fees, or returns are added. It matters to investors because interest charges, scheduled repayments, and total return are calculated from that base amount — think of it as the price tag on which future costs or gains are built. Knowing the principal helps you compare deals and predict cash flows and risk.
maturity date financial
"The maturity date ... was amended"
The maturity date is the specific day when a loan, bond, or investment reaches its full term and the borrower must repay the borrowed amount in full. It is important for investors because it indicates when they will receive their initial money back and can plan their future financial steps accordingly. Think of it as the due date for a loan or the day a gift card or coupon expires.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

When are NIMU’s amended promissory notes due?

NIMU’s four notes now mature on October 31, 2026; the previous maturity date was September 30, 2026. Each note has a $75,000 principal amount, and the amendments leave all other provisions unchanged.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Learn about SEC filing dates
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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

 

 

 

FORM 8-K

 

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

 

Date of report (Date of earliest event reported): September 29, 2026

 

Non-Invasive Monitoring Systems, Inc.

(Exact Name of Registrant as Specified in Its Charter)

 

Florida   000-13176   59-2007840

(State or other jurisdiction

of incorporation)

 

(Commission

File Number)

 

(IRS Employer

Identification No.)

 

4400 Biscayne Blvd., Suite 180, Miami, Florida 33137

(Address of Principal Executive Offices) (Zip Code)

 

(305) 575-4200

(Registrant’s Telephone Number, Including Area Code)

 

N/A

(Former Name or Former Address, if Changed Since Last Report)

 

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

 

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)
   
☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)
   
☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))
   
☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

 

Securities registered pursuant to Section 12(b) of the Act:

 

Title of each class   Trading Symbol(s)   Name on each exchange on which registered
None   N/A   N/A

 

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

 

Emerging growth company ☐

 

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

 

 

 

 
 

 

Item 1.01 Entry into a Material Definitive Agreement.

 

See Item 2.03.

 

Item 2.03 Creation of a Direct Financial Obligation or an Obligation under an Off-Balance Sheet Arrangement of a Registrant.

 

Fifth Amendment to 2021 Frost Gamma Investments Trust Promissory Note

 

On September 29, 2026, Non-Invasive Monitoring Systems, Inc. (“NIMS”) entered into the Fifth Amendment to that certain Promissory Note dated October 4, 2021 in the principal amount of $75,000 with Frost Gamma Investments Trust (the “2021 Frost Gamma Note”), a trust controlled by Dr. Phillip Frost, a current director, which beneficially owns in excess of 10% of our common stock. The maturity date on the 2021 Frost Gamma Note was amended from September 30, 2026 until October 31, 2026. No other provisions of the 2021 Frost Gamma Note were amended.

 

The foregoing is only a brief summary of the Fifth Amendment to the 2021 Frost Gamma Note and does not purport to be complete. Please refer to the Fifth Amendment to the 2021 Frost Gamma Note, which is attached as Exhibit 10.1 for its full terms.

 

Fifth Amendment to 2021 Hsiao Promissory Note

 

On September 29, 2026, NIMS entered into the Fifth Amendment to that certain Promissory Note dated October 4, 2021 in the principal amount of $75,000 with Dr. Jane Hsiao (the “2021 Hsiao Note”), NIMS’ Chairman of the Board and Interim Chief Executive Officer and a beneficial owner in excess of 10% of our common stock. The maturity date on the 2021 Hsiao Note was amended from September 30, 2026 until October 31, 2026. No other provisions of the 2021 Hsiao Note were amended.

 

The foregoing is only a brief summary of the Fifth Amendment to the 2021 Hsiao Note and does not purport to be complete. Please refer to the Fifth Amendment to the 2021 Hsiao Note, which is attached as Exhibit 10.2 for its full terms.

 

Fifth Amendment to 2022 Frost Gamma Investments Trust Promissory Note

 

On September 29, 2026, NIMS entered into the Fifth Amendment to that certain Promissory Note dated September 16, 2022 in the principal amount of $75,000 with Frost Gamma Investments Trust (the “2022 Frost Gamma Note”), a trust controlled by Dr. Phillip Frost, a current director, which beneficially owns in excess of 10% of our common stock. The maturity date on the 2022 Frost Gamma Note was amended from September 30, 2026 until October 31, 2026. No other provisions of the 2022 Frost Gamma Note were amended.

 

The foregoing is only a brief summary of the Fifth Amendment to the 2022 Frost Gamma Note and does not purport to be complete. Please refer to the Fifth Amendment to the 2022 Frost Gamma Note, which is attached as Exhibit 10.3 for its full terms.

 

 
 

 

Fifth Amendment to 2022 Hsiao Promissory Note

 

On September 29, 2026, NIMS entered into the Fifth Amendment to that certain Promissory Note dated September 16, 2022 in the principal amount of $75,000 with Dr. Jane Hsiao (the “2022 Hsiao Note”), NIMS’ Chairman of the Board and Interim Chief Executive Officer and a beneficial owner in excess of 10% of our common stock. The maturity date on the 2022 Hsiao Note was amended from September 30, 2026 until October 31, 2026. No other provisions of the 2022 Hsiao Note were amended.

 

The foregoing is only a brief summary of the Fifth Amendment to the 2022 Hsiao Note and does not purport to be complete. Please refer to the Fifth Amendment to the 2022 Hsiao Note, which is attached as Exhibit 10.4 for its full terms.

 

Item 9.01 Financial Statements and Exhibits.

 

(d) Exhibits

 

10.1   Fifth Amendment dated September 29, 2026 to Promissory Note of Non-Invasive Monitoring Systems, Inc. in favor of Frost Gamma Investments Trust, dated October 4, 2021.
     
10.2   Fifth Amendment dated September 29, 2026 to Promissory Note of Non-Invasive Monitoring Systems, Inc. in favor of Jane Hsiao, dated October 4, 2021.
     
10.3   Fifth Amendment dated September 29, 2026 to Promissory Note of Non-Invasive Monitoring Systems, Inc. in favor of Frost Gamma Investments Trust, dated September 16, 2022.
     
10.4   Fifth Amendment dated September 29, 2026 to Promissory Note of Non-Invasive Monitoring Systems, Inc. in favor of Jane Hsiao, dated September 16, 2022.
     
104   Cover Page Interactive Data File (embedded within the Inline XBRL document)

 

 
 

 

SIGNATURES

 

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

 

  Non-Invasive Monitoring Systems, Inc.
     
October 2, 2026 By: /s/ James J. Martin
  Name: James J. Martin
  Title: Chief Financial Officer

 

 

Filing Exhibits & Attachments

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