# EDGAR Filing Document

**Accession Number:** 0000751978
**File Stem:** 0001512868-26-000004
**Filing Date:** 2026-5
**Character Count:** 7819
**Document Hash:** 297af3cb55b1b5f0facadbaa35a8b5cf
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001512868-26-000004.hdr.sgml**: 20260504

**ACCESSION NUMBER**: 0001512868-26-000004

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260501

**FILED AS OF DATE**: 20260504

**DATE AS OF CHANGE**: 20260504

**REPORTING-OWNER**: 

**OWNER DATA:**
- **COMPANY CONFORMED NAME:** Davies Philip D
- **CENTRAL INDEX KEY:** 0001512868

**ORGANIZATION NAME:**

**FILING VALUES:**
- **FORM TYPE:** 4
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 000-18277
- **FILM NUMBER:** 26935707

**MAIL ADDRESS:**
- **STREET 1:** 25 FRONTAGE RD.
- **CITY:** ANDOVER
- **STATE:** MA
- **ZIP:** 01810
**ISSUER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** VICOR CORP
- **CENTRAL INDEX KEY:** 0000751978
- **STANDARD INDUSTRIAL CLASSIFICATION:** ELECTRONIC COMPONENTS, NEC [3679]
- **ORGANIZATION NAME:** 04 Manufacturing
- **EIN:** 042742817
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**BUSINESS ADDRESS:**
- **STREET 1:** 25 FRONTAGE ROAD
- **CITY:** ANDOVER
- **STATE:** MA
- **ZIP:** 01810
- **BUSINESS PHONE:** (978) 470-2900

**MAIL ADDRESS:**
- **STREET 1:** 25 FRONTAGE RD
- **CITY:** ANDOVER
- **STATE:** MA
- **ZIP:** 01810

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

## FORM 4

### STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

[ ] Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

[x] Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

---

| | | |
|:---|:---|:---|
| **1. Name and Address of Reporting Person**<sup>*</sup><br>Davies Philip D<br><sub>(Last) (First) (Middle)</sub><br>25 FRONTAGE RD.<br><sub>(Street)</sub><br>ANDOVER, MA 01810<br><sub>(City) (State) (Zip)</sub> | **3. Date of Earliest Transaction (Month/Day/Year)**<br>2026-05-01 | **5. Relationship of Reporting Person(s) to Issuer**<br>(Check all applicable)<br>[X] Director [ ] 10% Owner<br>[X] Officer (give title below) [ ] Other (specify below)<br>_VP Global Sales & Marketing_ |
| **2. Issuer Name and Ticker or Trading Symbol**<br>VICOR CORP [ vicr ] | **4. If Amendment, Date of Original Filed (Month/Day/Year)**<br>  | **6. Individual or Joint/Group Filing (Check Applicable Line)**<br>[X] Form filed by One Reporting Person<br>[ ] Form filed by More than One Reporting Person |

---

## Table I - Non-Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | 3. Transaction Code (V) | 3. Transaction Code (V) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 4. Securities Acquired (A) or Disposed of (D) | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| 1. Title of Security | 2. Transaction Date | 2A. Deemed Execution Date | Code | V | Amount | (A) or (D) | Price | 5. Amount of Securities Beneficially Owned | 6. Ownership Form | 7. Nature of Indirect Beneficial Ownership |
| Common Stock | 2026-05-01 |  | M |  | 3073 | A | $30.98 | 4993 | D |  |
| Common Stock | 2026-05-01 |  | S<sup>(1)</sup> |  | 100 | D | 264.07<sup>(2)</sup> | 4893 | D |  |
| Common Stock | 2026-05-01 |  | S<sup>(1)</sup> |  | 400 | D | 266.505<sup>(3)</sup> | 4493 | D |  |
| Common Stock | 2026-05-01 |  | S<sup>(1)</sup> |  | 800 | D | 268.4<sup>(4)</sup> | 3693 | D |  |
| Common Stock | 2026-05-01 |  | S<sup>(1)</sup> |  | 1173 | D | 269.3865<sup>(5)</sup> | 2520 | D |  |
| Common Stock | 2026-05-01 |  | S<sup>(1)</sup> |  | 200 | D | 270.31<sup>(6)</sup> | 2320 | D |  |
| Common Stock | 2026-05-01 |  | S<sup>(1)</sup> |  | 200 | D | 271.53<sup>(7)</sup> | 2120 | D |  |
| Common Stock | 2026-05-01 |  | S<sup>(1)</sup> |  | 100 | D | 273.21<sup>(8)</sup> | 2020 | D |  |
| Common Stock | 2026-05-01 |  | S<sup>(1)</sup> |  | 100 | D | 274.43<sup>(9)</sup> | 1920 | D |  |

---

## Table II - Derivative Securities

---

|  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | 4. Transaction Code (V) | 4. Transaction Code (V) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 5. Number of Derivative Securities Acquired (A) or Disposed of (D) | 6. Date Exercisable and Expiration Date | 6. Date Exercisable and Expiration Date | 7. Title and Amount of Underlying Securities | 7. Title and Amount of Underlying Securities | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| 1. Title of Derivative Security | 2. Conversion or Exercise Price | 3. Transaction Date | 3A. Deemed Execution Date | Code | V | (A) | (D) | Date Exercisable | Expiration Date | Title | Amount or Number of Shares | 8. Price of Derivative Security | 9. Number of Derivative Securities Beneficially Owned | 10. Ownership Form | 11. Nature of Indirect Beneficial Ownership |
| Non Qualified Stock Option | $30.98 | 2026-05-01 |  | M |  |  | 3073 | <sup>(10)</sup> | 2029-09-06 | Common Stock | 3073 | $0 | 5466 | D |  |

---

### Footnotes:

(1) This sale was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on November 21, 2025.

(2) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $264.0700 to $264.0700.

(3) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $266.2200 to $266.9400.

(4) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $267.6900 to $268.6800

(5) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $268.8100 to $269.7700.

(6) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $270.1100 to $270.5100.

(7) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $271.4400 to $271.6200.

(8) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $273.2100 to $273.2100.

(9) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $274.4300 to $274.4300.

(10) Options granted on 9/6/2019 and vest over five years.

**Signature:** /s/Quentin A. Fendelet  Attorney in fact for Philip D. Davies  
**Date:** 2026-05-04

### Remarks:

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.

**Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.**