# EDGAR Filing Document

**Accession Number:** 0001831915
**File Stem:** 0001140361-26-017480
**Filing Date:** 2026-4
**Character Count:** 2083
**Document Hash:** f10898f688a5adaa40427329c0b911b9
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001140361-26-017480.hdr.sgml**: 20260428

**ACCESSION NUMBER**: 0001140361-26-017480

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20260428

**DATE AS OF CHANGE**: 20260428

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Cytek Biosciences, Inc.
- **CENTRAL INDEX KEY:** 0001831915
- **STANDARD INDUSTRIAL CLASSIFICATION:** LABORATORY ANALYTICAL INSTRUMENTS [3826]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 472547526
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-40632
- **FILM NUMBER:** 26908540

**BUSINESS ADDRESS:**
- **STREET 1:** 47215 LAKEVIEW BOULEVARD
- **CITY:** FREMONT
- **STATE:** CA
- **ZIP:** 94538
- **BUSINESS PHONE:** (877) 922-9835

**MAIL ADDRESS:**
- **STREET 1:** 47215 LAKEVIEW BOULEVARD
- **CITY:** FREMONT
- **STATE:** CA
- **ZIP:** 94538

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Cytek BioSciences, Inc.
- **DATE OF NAME CHANGE:** 20201110

### SCHEDULE 14A

#### <br>

#### Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934

#### (Amendment No.)

#### <br>
Filed by the Registrant ☒ <br> Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐ Preliminary Proxy Statement

☐ **Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))**

☐ Definitive Proxy Statement

☒ Definitive Additional Materials

☐ Soliciting Material Pursuant to § 240.14a-12

## Cytek Biosciences, Inc.

#### (Name of Registrant as Specified In Its Charter)

#### <br>

#### (Name of Person(s) Filing Proxy Statement if other than the Registrant)

#### <br>
Payment of Filing Fee (Check all boxes that apply):

☒ No fee required. <br> ☐ Fee paid previously with preliminary materials <br> ☐ Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

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