MCCOMBE WILLIAM D. (Chief Financial Officer) exercised options at CYTEK BIOSCIENCES, INC.

Option exercise — a mechanical event triggered by vesting or expiry. Not a discretionary conviction trade.

M · 2 exercises

MCCOMBE WILLIAM D.

Filed: 3/12/2026ACC: 0001878824-26-000001

InsiderMCCOMBE WILLIAM D.CIK 1878824

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IssuerCYTEK BIOSCIENCES, INC.CIK 1831915

Officer· Chief Financial Officer

Since Mar 2026

+383.25K

Net shares

Net buyer

$41.2K

Total sold

Open market trades

0B · 0S

Total transactions

416.72K acquired · 33.47K disposed

Non-Derivative Transactions4

Common Stock

Direct

M · Option Exercise

+6.32K

Price / share

—

Trade value

—

% of position

7.8%

3/10/2026

80.71K→87.03K

Common Stock

Direct

F · Tax Withholding

−2.60K

Price / share

$4.23

Trade value

$11.01K

% of position

3.0%

3/10/2026

87.03K→84.43K

Common Stock

Direct

M · Option Exercise

+17.40K

Price / share

—

Trade value

—

% of position

20.6%

3/10/2026

84.43K→101.83K

Common Stock

Direct

F · Tax Withholding

−7.14K

Price / share

$4.23

Trade value

$30.22K

% of position

7.0%

3/10/2026

101.83K→94.69K

Total

Net shares

+13.97K

Net value

-$41.23K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	3/10/2026	M · Option Exercise	+6.32K	—	—	7.8%	80.71K	87.03K
Common Stock Direct	3/10/2026	F · Tax Withholding	−2.60K	$4.23	$11.01K	3.0%	87.03K	84.43K
Common Stock Direct	3/10/2026	M · Option Exercise	+17.40K	—	—	20.6%	84.43K	101.83K
Common Stock Direct	3/10/2026	F · Tax Withholding	−7.14K	$4.23	$30.22K	7.0%	101.83K	94.69K
Total			+13.97K		-$41.23K

Derivative Transactions4

Employee Stock Option (right to buy)

Direct

A · Award

Converts to

Common Stock

136.21K shares

+136.21K

Strike price

4.23

Held after

136.21K

Exercisable

—

3/10/2026

Restricted Stock Units

Direct

A · Award

Converts to

Common Stock

256.79K shares

+256.79K

Strike price

Held after

256.79K

Exercisable

—

3/10/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

6.32K shares

−6.32K

Strike price

Held after

56.89K

Exercisable

—

3/10/2026

Restricted Stock Units

Direct

M · Option Exercise

Converts to

Common Stock

17.40K shares

−17.40K

Strike price

Held after

156.61K

Exercisable

—

3/10/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Employee Stock Option (right to buy) Direct	Common Stock136.21K shares	3/10/2026	A · Award	+136.21K	4.23	—	136.21K
Restricted Stock Units Direct	Common Stock256.79K shares	3/10/2026	A · Award	+256.79K		—	256.79K
Restricted Stock Units Direct	Common Stock6.32K shares	3/10/2026	M · Option Exercise	−6.32K		—	56.89K
Restricted Stock Units Direct	Common Stock17.40K shares	3/10/2026	M · Option Exercise	−17.40K		—	156.61K