# EDGAR Filing Document

**Accession Number:** 0001568322
**File Stem:** 0001568322-26-000006
**Filing Date:** 2026-4
**Character Count:** 41225
**Document Hash:** b0c33a6eba410cdb028773c01207f35a
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001568322-26-000006.hdr.sgml**: 20260427

**ACCESSION NUMBER**: 0001568322-26-000006

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13D

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20260427

**DATE AS OF CHANGE**: 20260427

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** ELECTRO SENSORS INC
- **CENTRAL INDEX KEY:** 0000351789
- **STANDARD INDUSTRIAL CLASSIFICATION:** INDUSTRIAL INSTRUMENTS FOR MEASUREMENT, DISPLAY, AND CONTROL [3823]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 410943459
- **STATE OF INCORPORATION:** MN
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13D
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-33286
- **FILM NUMBER:** 26902462

**BUSINESS ADDRESS:**
- **STREET 1:** 6111 BLUE CIRCLE DR
- **CITY:** MINNETONKA
- **STATE:** MN
- **ZIP:** 55343-9108
- **BUSINESS PHONE:** 9529300100

**MAIL ADDRESS:**
- **STREET 1:** 6111 BLUE CIRCLE DR
- **CITY:** MINNETONKA
- **STATE:** MN
- **ZIP:** 55343
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Feldman Jesse
- **CENTRAL INDEX KEY:** 0001568322

**ORGANIZATION NAME:**

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

**MAIL ADDRESS:**
- **STREET 1:** ONE MARINA PARK DRIVE
- **STREET 2:** SUITE 1100
- **CITY:** BOSTON
- **STATE:** MA
- **ZIP:** 02210

## Exhibit 99.1

EXHIBIT 99.1

JOINT FILING AGREEMENT

We, the undersigned, hereby express our agreement that the attached Schedule 13D (or any amendments thereto) relating to the common stock of Electro-Sensors, Inc. is filed on behalf of each of us.

Dated: April 27, 2026

---

| | |
|:---|:---|
| **BATTERY VENTURES XIV (AIV I CAYMAN), L.P.**<br> By: <u>/s/ Christopher Schiavo</u> <br> Name:<br> Christopher Schiavo<br> Title:<br> Attorney-in-Fact <br> **BATTERY VENTURES XIV-EF (AIV I CAYMAN), L.P.**<br> By: <u>/s/ Christopher Schiavo</u> <br> Name:<br> Christopher Schiavo<br> Title:<br> Attorney-in-Fact <br> **BATTERY INVESTMENT PARTNERS XIV (AIV I CAYMAN), LP**<br> By: <u>/s/ Christopher Schiavo</u> <br> Name:<br> Christopher Schiavo<br> Title:<br> Attorney-in-Fact <br> **NEERAJ AGRAWAL**<br> By: <u>/s/ Christopher Schiavo</u> <br> Name:<br> Christopher Schiavo<br> Title:<br> Attorney-in-Fact <br> **MICHAEL M. BROWN**<br> By: <u>/s/ Christopher Schiavo</u> <br> Name:<br> Christopher Schiavo<br> Title:<br> Attorney-in-Fact <br> **MORAD ELHAFED**<br> By: <u>/s/ Christopher Schiavo</u> <br> Name:<br> Christopher Schiavo<br> Title:<br> Attorney-in-Fact <br> **JESSE FELDMAN**<br> By: <u>/s/ Christopher Schiavo</u> <br> Name:<br> Christopher Schiavo<br> Title:<br> Attorney-in-Fact <br> **RUSSELL L. FLEISCHER**<br> By: <u>/s/ Christopher Schiavo</u> <br> Name:<br> Christopher Schiavo<br> Title:<br> Attorney-in-Fact | **BATTERY PARTNERS XIV (AIV I CAYMAN), L.P.**<br> By: <u>/s/ Christopher Schiavo</u> <br> Name:<br> Christopher Schiavo<br> Title:<br> Attorney-in-Fact <br> **BATTERY PARTNERS XIV (AIV I CAYMAN), LTD.**<br> By: <u>/s/ Christopher Schiavo</u> <br> Name:<br> Christopher Schiavo<br> Title:<br> Attorney-in-Fact <br>**ROGER H. LEE**<br> By: <u>/s/ Christopher Schiavo</u> <br> Name:<br> Christopher Schiavo<br> Title:<br> Attorney-in-Fact <br> **ZACHARY SMOTHERMAN**<br> By: <u>/s/ Christopher Schiavo</u> <br> Name:<br> Christopher Schiavo<br> Title:<br> Attorney-in-Fact <br> **CHELSEA R. STONER**<br> By: <u>/s/ Christopher Schiavo</u> <br> Name:<br> Christopher Schiavo<br> Title:<br> Attorney-in-Fact <br> **DHARMESH THAKKER**<br> By: <u>/s/ Christopher Schiavo</u> <br> Name:<br> Christopher Schiavo<br> Title:<br> Attorney-in-Fact <br>|

---

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

## SCHEDULE 13D

### Under the Securities Exchange Act of 1934

**Electro-Sensors, Inc.**

*(Name of Issuer)*

**Common Stock, par value $0.10 per share**

*(Title of Class of Securities)*

**—**

*(CUSIP Number)*

**Lizette Perez-Deisboeck**<br>c/o Battery Ventures<br>One Marina Park Drive, Suite 1100<br>Boston MA 02210<br>(617) 948-3600

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

**04/20/2026**

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

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Jesse Feldman** | Name of reporting person<br>**Jesse Feldman** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 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>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1939258.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1939258.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | |
| 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>**52.5%** | Percent of class represented by amount in Row (11)<br>**52.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Neeraj Agrawal** | Name of reporting person<br>**Neeraj Agrawal** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 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>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1939258.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1939258.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | |
| 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>**52.5%** | Percent of class represented by amount in Row (11)<br>**52.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Michael M. Brown** | Name of reporting person<br>**Michael M. Brown** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 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>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1939258.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1939258.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | |
| 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>**52.5%** | Percent of class represented by amount in Row (11)<br>**52.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Morad Elhafed** | Name of reporting person<br>**Morad Elhafed** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 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>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1939258.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1939258.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | |
| 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>**52.5%** | Percent of class represented by amount in Row (11)<br>**52.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Russell L. Fleischer** | Name of reporting person<br>**Russell L. Fleischer** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 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>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1939258.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1939258.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | |
| 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>**52.5%** | Percent of class represented by amount in Row (11)<br>**52.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Roger H. Lee** | Name of reporting person<br>**Roger H. Lee** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 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>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1939258.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1939258.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | |
| 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>**52.5%** | Percent of class represented by amount in Row (11)<br>**52.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Zachary Smotherman** | Name of reporting person<br>**Zachary Smotherman** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 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>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1939258.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1939258.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | |
| 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>**52.5%** | Percent of class represented by amount in Row (11)<br>**52.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Chelsea R. Stoner** | Name of reporting person<br>**Chelsea R. Stoner** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 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>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1939258.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1939258.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | |
| 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>**52.5%** | Percent of class represented by amount in Row (11)<br>**52.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Dharmesh Thakker** | Name of reporting person<br>**Dharmesh Thakker** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 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>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1939258.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1939258.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | |
| 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>**52.5%** | Percent of class represented by amount in Row (11)<br>**52.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**IN** | Type of Reporting Person (See Instructions)<br>**IN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Battery Ventures XIV (AIV I Cayman), L.P.** | Name of reporting person<br>**Battery Ventures XIV (AIV I Cayman), L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 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>**CAYMAN ISLANDS** | Citizenship or place of organization<br>**CAYMAN ISLANDS** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1939258.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1939258.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | |
| 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>**52.5%** | Percent of class represented by amount in Row (11)<br>**52.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Battery Ventures XIV-EF (AIV I Cayman), L.P.** | Name of reporting person<br>**Battery Ventures XIV-EF (AIV I Cayman), L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 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>**CAYMAN ISLANDS** | Citizenship or place of organization<br>**CAYMAN ISLANDS** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1939258.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1939258.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | |
| 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>**52.5%** | Percent of class represented by amount in Row (11)<br>**52.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Battery Investment Partners XIV (AIV I Cayman), L.P.** | Name of reporting person<br>**Battery Investment Partners XIV (AIV I Cayman), L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 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>**CAYMAN ISLANDS** | Citizenship or place of organization<br>**CAYMAN ISLANDS** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1939258.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1939258.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | |
| 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>**52.5%** | Percent of class represented by amount in Row (11)<br>**52.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Battery Partners XIV (AIV I Cayman), L.P.** | Name of reporting person<br>**Battery Partners XIV (AIV I Cayman), L.P.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 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>**CAYMAN ISLANDS** | Citizenship or place of organization<br>**CAYMAN ISLANDS** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1939258.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1939258.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | |
| 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>**52.5%** | Percent of class represented by amount in Row (11)<br>**52.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**PN** | Type of Reporting Person (See Instructions)<br>**PN** | |

---

| **CUSIP No.** | **—** |

---

| | | | |
|:--|:--|:--|:--|
| 1 | Name of reporting person<br>**Battery Partners XIV (AIV I Cayman), Ltd.** | Name of reporting person<br>**Battery Partners XIV (AIV I Cayman), Ltd.** | |
| 2 | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | Check the appropriate box if a member of a Group (See Instructions)<br>[ ] (a)<br>[x] (b) | |
| 3 | SEC use only | SEC use only | |
| 4 | Source of funds (See Instructions)<br>**OO** | Source of funds (See Instructions)<br>**OO** | |
| 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>**CAYMAN ISLANDS** | Citizenship or place of organization<br>**CAYMAN ISLANDS** | |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 7 | Sole Voting Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 8 | Shared Voting Power<br>**1939258.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 9 | Sole Dispositive Power<br>**0.00** |
| Number of Shares<br>Beneficially Owned by<br>Each Reporting Person With: | 10 | Shared Dispositive Power<br>**1939258.00** |
| 11 | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | Aggregate amount beneficially owned by each reporting person<br>**1939258.00** | |
| 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>**52.5%** | Percent of class represented by amount in Row (11)<br>**52.5%** | |
| 14 | Type of Reporting Person (See Instructions)<br>**OO** | Type of Reporting Person (See Instructions)<br>**OO** | |

---

**Item 1. Security and Issuer**

**(a) Title of Class of Securities:**
Common Stock, par value $0.10 per share

**(b) Name of Issuer:**
Electro-Sensors, Inc.

**(c) Address of Issuer's Principal Executive Offices:**
6111 Blue Circle Drive, Minnetonka, MN, 55343

**Item 4. Purpose of Transaction**

On April 20, 2026, the Issuer entered into an Agreement and Plan of Merger (the "Merger Agreement") with steute Industrial Controls, Inc., a Connecticut corporation ("Parent"), and Steute Burwell Inc., a Minnesota corporation and a wholly owned subsidiary of Parent ("Merger Sub"). Pursuant to the terms of the Merger Agreement, Parent will acquire the Issuer through the merger of Merger Sub with and into the Issuer, with the Issuer continuing as the surviving corporation of the merger (the "Merger") and a wholly owned subsidiary of Parent, subject to the terms and conditions set forth in the Merger Agreement. Parent and Merger Sub are each affiliates of BV14, BV14-EF and BIP 14. The foregoing description of the Merger Agreement does not purport to be complete and is qualified in its entirety by reference to the full text of the Merger Agreement, a copy of which is attached hereto as Exhibit 99.2 and incorporated by reference herein.

Concurrently with the execution of the Merger Agreement, all of the Company's directors and a majority of the Company's largest shareholders--Jeffrey D. Peterson, Patricia N. Peterson, Lynne E. Peterson, John E. Peterson, and Paul R. Peterson--(collectively, the "Voting Parties") entered into voting agreements in favor of Parent and Merger Sub, pursuant to which such persons have, subject to the terms and conditions set forth therein, agreed to vote all of their shares of common stock, $0.10 par value per share, of the Issuer ("Common Stock") owned by the Voting Parties, representing approximately 52.48% of the Issuer's issued and outstanding Common Stock in the aggregate, in favor of the Merger and the adoption of the Merger Agreement and against any alternative transaction proposal (collectively, the "Voting Agreements"). In addition, each shareholder party to a Voting Agreement has agreed not to take certain actions, including (i) transferring any Shares (subject to certain exceptions), (ii) granting any proxies or powers of attorney or (iii) exercising any dissenters' rights with respect to the Merger. No separate consideration was paid by Parent or Merger Sub in connection with the Voting Agreement. The foregoing description of the Voting Agreements does not purport to be complete and is qualified in its entirety by reference to the full text of the Voting Agreement, a copy of which is attached hereto as Exhibit 99.3 and incorporated by reference herein.

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

**(a)**
As a result of the Voting Agreements, the Reporting Persons may be deemed to be the beneficial owner of 1,939,258 shares of the Issuer's Common Stock, which includes 60,000 shares of Common Stock issuable upon the exercise of stock options or assumed to be exercisable within 60 days of April 20, 2026  and 17,500 shares of Common Stock issuable upon the settlement of restricted stock units covered by the Voting Agreements that are either settleable or assumed to be settleable within 60 days of April 20, 2026.

The Reporting Persons may be deemed to have the shared power to direct the vote of the shares of the Issuer's Common Stock subject to the Voting Agreements with respect to those matters described in Item
4. However, the Reporting Persons (i) are not entitled to any rights as a shareholder of the Issuer as to the shares of the Issuer's Common Stock subject to the Voting Agreements, (ii) disclaim any beneficial ownership of the shares of the Issuer's Common Stock covered by the Voting Agreements, (iii) do not have the power to dispose of the shares of the Issuer's Common Stock covered by the Voting Agreements, and (iv) do not have the power to cause the stock options to be exercised or the restricted stock units to be settled. Except as described in this Schedule 13D, none of the Reporting Persons beneficially owns any shares of the Issuer's Common Stock.

BP14 is the general partner of each of BV14, BIP14, and BV14-EF; BPGP14 is the general partner of BP14. The BV Managing Members are the directors of BPGP14.

**(b)**
Rows 7 through 10 of each Reporting Person's cover page to this Schedule 13D set forth the number of shares of Common Stock as to which such Reporting Person has the sole or shared power to vote or direct the vote and sole or shared power to dispose or to direct the disposition and are incorporated by reference.

**(c)**
Except as set forth herein, none of the Reporting Persons has effected any transactions with respect to the securities of the Issuer during the past sixty days.

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

Item 4 of this Schedule 13D is incorporated herein by reference.

### 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:** Jesse Feldman

**Signature:** /s/ Christopher Schiavo

**Name/Title:** By Christopher Schiavo, Attorney-in-Fact

**Date:** 04/27/2026

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:** Neeraj Agrawal

**Signature:** /s/ Christopher Schiavo

**Name/Title:** By Christopher Schiavo, Attorney-in-Fact

**Date:** 04/27/2026

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:** Michael M. Brown

**Signature:** /s/ Christopher Schiavo

**Name/Title:** By Christopher Schiavo, Attorney-in-Fact

**Date:** 04/27/2026

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:** Morad Elhafed

**Signature:** /s/ Christopher Schiavo

**Name/Title:** By Christopher Schiavo, Attorney-in-Fact

**Date:** 04/27/2026

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:** Russell L. Fleischer

**Signature:** /s/ Christopher Schiavo

**Name/Title:** By Christopher Schiavo, Attorney-in-Fact

**Date:** 04/27/2026

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:** Roger H. Lee

**Signature:** /s/ Christopher Schiavo

**Name/Title:** By Christopher Schiavo, Attorney-in-Fact

**Date:** 04/27/2026

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:** Zachary Smotherman

**Signature:** /s/ Christopher Schiavo

**Name/Title:** By Christopher Schiavo, Attorney-in-Fact

**Date:** 04/27/2026

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:** Chelsea R. Stoner

**Signature:** /s/ Christopher Schiavo

**Name/Title:** By Christopher Schiavo, Attorney-in-Fact

**Date:** 04/27/2026

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:** Dharmesh Thakker

**Signature:** /s/ Christopher Schiavo

**Name/Title:** By Christopher Schiavo, Attorney-in-Fact

**Date:** 04/27/2026

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:** Battery Ventures XIV (AIV I Cayman), L.P.

**Signature:** /s/ Christopher Schiavo

**Name/Title:** By Christopher Schiavo, Attorney-in-Fact

**Date:** 04/27/2026

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:** Battery Ventures XIV-EF (AIV I Cayman), L.P.

**Signature:** /s/ Christopher Schiavo

**Name/Title:** By Christopher Schiavo, Attorney-in-Fact

**Date:** 04/27/2026

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:** Battery Investment Partners XIV (AIV I Cayman), L.P.

**Signature:** /s/ Christopher Schiavo

**Name/Title:** By Christopher Schiavo, Attorney-in-Fact

**Date:** 04/27/2026

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:** Battery Partners XIV (AIV I Cayman), L.P.

**Signature:** /s/ Christopher Schiavo

**Name/Title:** By Christopher Schiavo, Attorney-in-Fact

**Date:** 04/27/2026

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:** Battery Partners XIV (AIV I Cayman), Ltd.

**Signature:** /s/ Christopher Schiavo

**Name/Title:** By Christopher Schiavo, Attorney-in-Fact

**Date:** 04/27/2026