# EDGAR Filing Document

**Accession Number:** 0000087802
**File Stem:** 0001140361-25-032306
**Filing Date:** 2025-8
**Character Count:** 13083
**Document Hash:** 106cdcb8d63efa1cfee0df418700faca
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-25-032306.hdr.sgml**: 20250822

**ACCESSION NUMBER**: 0001140361-25-032306

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D/A

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20250822

**DATE AS OF CHANGE**: 20250822

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** SCIENTIFIC INDUSTRIES INC
- **CENTRAL INDEX KEY:** 0000087802
- **STANDARD INDUSTRIAL CLASSIFICATION:** LABORATORY ANALYTICAL INSTRUMENTS [3826]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 042217279
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-13492
- **FILM NUMBER:** 251242841

**BUSINESS ADDRESS:**
- **STREET 1:** 70 ORVILLE DR
- **STREET 2:** AIRPORT INTERNATIONAL PLZ
- **CITY:** BOHEMIA
- **STATE:** NY
- **ZIP:** 11716
- **BUSINESS PHONE:** 6315674700

**MAIL ADDRESS:**
- **STREET 1:** 70 ORVILLE DR
- **CITY:** BOHEMIA
- **STATE:** NY
- **ZIP:** 11716
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** PESSIN SANDRA F
- **CENTRAL INDEX KEY:** 0000936979

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D/A

**MAIL ADDRESS:**
- **STREET 1:** C/O NORMAN PESSIN
- **STREET 2:** 366 MADISON AVENUE, 14TH FLOOR
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10017

## Exhibit 99.1

------

Exhibit 99.1

#### Schedule A

#### Transactions in the Securities of the Issuer During the Past 60 Days

---

| | | |
|:---|:---|:---|
| Shares of Common<br> <u>Stock Bought</u> | Price Per<br> <u>Share ($)</u> | Date of<br> <u>Purchase</u> |
|  | **<u>Brian L. Pessin</u>** |  |
| 100000 | 1.00 | 8/21/2025 |
|  | **<u>Norman H. Pessin</u>** |  |
| 220000 | 1.00 | 8/21/2025 |

---

------

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**(Amendment No. 3)**

**SCIENTIFIC INDUSTRIES INC**

*(Name of Issuer)*

**Common stock, par value $0.05 per share**

*(Title of Class of Securities)*

**808757108**

*(CUSIP Number)*

**Brian L. Pessin**<br>400 E 51st St, PH 31<br>New York NY 10022<br>(917) 887-1982

*(Name, Address and Telephone Number of Person Authorized to Receive Notices and Communications)*

**08/21/2025**

*(Date of Event Which Requires Filing of this Statement)*

| **CUSIP No.** | **808757108** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Brian L. Pessin** | Name of reporting person<br>**Brian L. Pessin** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**PF** | Source of funds (See Instructions)<br>**PF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**397531.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**397531.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**397531.00** | Aggregate amount beneficially owned by each reporting person<br>**397531.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**3.3%** | Percent of class represented by amount in Row (11)<br>**3.3%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** (1) Consists of 397,531 shares of common stock and warrants to purchase 146,316 shares of common stock.

| **CUSIP No.** | **808757108** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Norman H. Pessin** | Name of reporting person<br>**Norman H. Pessin** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**PF** | Source of funds (See Instructions)<br>**PF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**570000.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**570000.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**570000.00** | Aggregate amount beneficially owned by each reporting person<br>**570000.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**4.7%** | Percent of class represented by amount in Row (11)<br>**4.7%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** (2) Consists of 570,000 shares of common stock and warrants to purchase 130,000 shares of common stock.

| **CUSIP No.** | **808757108** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**PESSIN SANDRA F** | Name of reporting person<br>**PESSIN SANDRA F** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[x] (a)<br>[ ] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**PF** | Source of funds (See Instructions)<br>**PF** | |
| 5 | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | Check if disclosure of legal proceedings is required pursuant to Items 2(d) or 2(e)<br>[ ] | |
| 6 | Citizenship or place of organization<br>**X1** | Citizenship or place of organization<br>**X1** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**466507.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**466507.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**0.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**466507.00** | Aggregate amount beneficially owned by each reporting person<br>**466507.00** | |
| 12 | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | Check if the aggregate amount in Row (11) excludes certain shares (See Instructions)<br>[ ] | |
| 13 | Percent of class represented by amount in Row (11)<br>**3.9%** | Percent of class represented by amount in Row (11)<br>**3.9%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

**Comment for Reporting Person:** (3) Consists of 466,207 shares of common stock and warrants to purchase 233,253 shares of common stock.

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common stock, par value $0.05 per share

**(b) Name of Issuer:**
SCIENTIFIC INDUSTRIES INC

**(c) Address of Issuer's Principal Executive Offices:**
70 Orville Dr., Airport International Plaza, Bohemia, NY, 11716

This Schedule 13D relates to the common stock, $0.05 par value (the "Common Stock" or the "Shares") of Scientific Industries, Inc. (the
"Issuer"),whose principal executive offices are located at 70 Orville Dr, Airport International Plaza, Bohemia, NY 11716.

**Item 4. Purpose of Transaction**

The Reporting Persons originally purchased the Shares based on the belief that the Shares, when purchased, were undervalued and represented an attractive investment opportunity. Depending upon overall market conditions, other investment opportunities available to the Reporting Persons, and the availability of Shares at prices that would make the purchase or sale of Shares desirable, the Reporting Persons may endeavor to increase or decrease their position in the Issuer through, among other things, the purchase or sale of Shares on the open market or in private transactions or otherwise, on such terms and at such times as the Reporting Persons may deem advisable. The Reporting Persons intend to review their investment in the Issuer on a continuing basis. Depending on various factors including, without limitation, the Issuer's financial position and investment strategy, the price levels of the Shares, conditions in the securities markets and general economic and industry conditions, the Reporting Persons may in the future take such actions with respect to their investment in the Issuer as they deem appropriate including, without limitation, communications with management and the Board of Directors of the Issuer, engaging in discussions with third parties about the Issuer, making proposals to the Issuer concerning changes to the capitalization or operations of the Issuer, purchasing additional Shares, selling some or all of their Shares, engaging in short selling of or any hedging or similar transaction with respect to the Shares, or changing their intention with respect to any and all matters referred to in Item 4.

**Item 5. Interest in Securities of the Issuer**

**(a)**
Brian L. Pessin owns 397,531 shares of Common Stock of the Issuer, constituting 3.3% of the outstanding shares thereof. Norman H. Pessin owns 570,000 shares of Common Stock of the Issuer, constituting 4.7% of the outstanding shares thereof. Sandra F. Pessin owns 466,507 shares of Common Stock of the Issuer, constituting 3.9% of the outstanding shares thereof.
Brian L. Pessin has sole voting and dispositive power with respect to the shares of Common Stock he owns directly. Norman H. Pessin has sole voting and dispositive power with respect to the shares of Common Stock she owns directly. Sandra F. Pessin has sole voting and dispositive power with respect to the shares of Common Stock she owns directly.
Exhibit 99.1 attached hereto lists all transactions in securities of the Issuer during the past sixty days by the Reporting Persons. All of such transactions were effected through the exercise of warrants acquired in a private placement from April 17, 2025.
No person other than the Reporting Persons is known to have the right to receive, or the power to direct the receipt of dividends from, or proceeds from the sale of, the shares of Common Stock.

**(b)**
—

**(c)**
—

**Item 6. Contracts, Arrangements, Understandings or Relationships With Respect to Securities of the Issuer.**

None.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Brian L. Pessin

**Signature:** /s/ Brian L. Pessin

**Name/Title:** Brian L. Pessin

**Date:** 08/21/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** Norman H. Pessin

**Signature:** /s/ Norman H. Pessin

**Name/Title:** Norman H. Pessin

**Date:** 08/21/2025

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Reporting Person:** PESSIN SANDRA F

**Signature:** /s/ Sandra F. Pessin

**Name/Title:** Sandra F. Pessin

**Date:** 08/21/2025