# EDGAR Filing Document

**Accession Number:** 0001512868
**File Stem:** 0001512868-26-000002
**Filing Date:** 2026-3
**Character Count:** 9572
**Document Hash:** 8aa8a0b1a39b5c4cba10fd0af1fcadcb
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001512868-26-000002.hdr.sgml**: 20260309

**ACCESSION NUMBER**: 0001512868-26-000002

**CONFORMED SUBMISSION TYPE**: 4

**PUBLIC DOCUMENT COUNT**: 1

**CONFORMED PERIOD OF REPORT**: 20260305

**FILED AS OF DATE**: 20260309

**DATE AS OF CHANGE**: 20260309

**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:** 26734990

**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>2026-03-05 | **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 | 2026-03-05 |  | M |  | 1920 | A | $41.61 | 3840 | D |  |
| Common Stock | 2026-03-05 |  | M |  | 2585 | A | $60.61 | 6425 | D |  |
| Common Stock | 2026-03-05 |  | M |  | 914 | A | $75.43 | 7339 | D |  |
| Common Stock | 2026-03-05 |  | S<sup>(1)</sup> |  | 100 | D | 177.18<sup>(2)</sup> | 7239 | D |  |
| Common Stock | 2026-03-05 |  | S<sup>(1)</sup> |  | 700 | D | 179.3814<sup>(3)</sup> | 6539 | D |  |
| Common Stock | 2026-03-05 |  | S<sup>(1)</sup> |  | 607 | D | 180.2373<sup>(4)</sup> | 5932 | D |  |
| Common Stock | 2026-03-05 |  | S<sup>(1)</sup> |  | 698 | D | 181.4881<sup>(5)</sup> | 5234 | D |  |
| Common Stock | 2026-03-05 |  | S<sup>(1)</sup> |  | 100 | D | 182.17<sup>(6)</sup> | 5134 | D |  |
| Common Stock | 2026-03-05 |  | S<sup>(1)</sup> |  | 100 | D | 185.51<sup>(7)</sup> | 5034 | D |  |
| Common Stock | 2026-03-05 |  | S<sup>(1)</sup> |  | 300 | D | 187.2567<sup>(8)</sup> | 4734 | D |  |
| Common Stock | 2026-03-05 |  | S<sup>(1)</sup> |  | 300 | D | 189.2067<sup>(9)</sup> | 4434 | D |  |
| Common Stock | 2026-03-05 |  | S<sup>(1)</sup> |  | 300 | D | 193.12<sup>(10)</sup> | 4134 | D |  |
| Common Stock | 2026-03-05 |  | S<sup>(1)</sup> |  | 300 | D | 194.98<sup>(11)</sup> | 3834 | D |  |
| Common Stock | 2026-03-05 |  | S<sup>(1)</sup> |  | 100 | D | 196.45<sup>(12)</sup> | 3734 | D |  |
| Common Stock | 2026-03-05 |  | S<sup>(1)</sup> |  | 1514 | D | 199.4874<sup>(13)</sup> | 2220 | D |  |
| Common Stock | 2026-03-05 |  | S<sup>(1)</sup> |  | 300 | D | 202.1833<sup>(14)</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 | $41.61 | 2026-03-05 |  | M |  |  | 1920 | 2025-05-02 | <sup>(15)</sup> | Common Stock | 1920 | $0 | 15358 | D |  |
| Non Qualified Stock Option | $60.61 | 2026-03-05 |  | M |  |  | 2585 | 2025-04-25 | <sup>(15)</sup> | Common Stock | 2585 | $0 | 7752 | D |  |
| Non Qualified Stock Option | $75.43 | 2026-03-05 |  | M |  |  | 914 | 2025-05-12 | <sup>(15)</sup> | Common Stock | 914 | $0 | 1827 | 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 $177.1800 to $177.1800.

(3) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $178.7900 to $179.7700.

(4) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $180.0500 to $181.0100.

(5) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $181.1600 to $181.9400.

(6) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $182.1700 to $182.1700.

(7) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $185.5100 to $185.5100.

(8) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $186.9200 to $187.8800.

(9) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $189.0600 to $189.4800.

(10) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $192.9800 to $193.1900

(11) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $194.9500 to $195.

(12) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $196.4500 to $196.4500.

(13) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $199.4200 to $199.7200.

(14) The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $202.1100 to $202.2600

(15) Options expire 2 years from each date of vesting.

**Signature:** /s/Quentin A. Fendelet  Attorney in fact for Philip D. Davies  
**Date:** 2026-03-05

### 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.**