MOOKERJI SUMAN B. (Sr. V.P., C.F.O.) sold 28.3% of their position (14.71K shares) of DUCOMMUN INC /DE/ on the open market

Open‑market sale worth $1.97M — a significant reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

MOOKERJI SUMAN B.

Filed: 3/6/2026ACC: 0001975924-26-000002

InsiderMOOKERJI SUMAN B.CIK 1975924

→

IssuerDUCOMMUN INC /DE/CIK 30305

Officer· Sr. V.P., C.F.O.

Since Mar 2026

+125.00

Net shares

Net buyer

$3.67M

Total sold

Open market trades

0B · 1S

Total transactions

27.08K acquired · 26.95K disposed

Non-Derivative Transactions7

Common Stock

Direct

A · Award

+14.31K

Price / share

—

Trade value

—

% of position

34.3%

3/4/2026

41.76K→56.07K

Common Stock

Direct

F · Tax Withholding

−7.70K

Price / share

$139.45

Trade value

$1.07M

% of position

13.7%

3/4/2026

56.07K→48.38K

Common Stock

Direct

A · Award

+3.36K

Price / share

—

Trade value

—

% of position

6.9%

3/4/2026

48.38K→51.74K

Common Stock

Direct

S · Sale

−14.71K

Price / share

$134.21

Trade value

$1.97M

% of position

28.3%

3/4/2026

51.89K→37.18K

Common Stock

Direct

F · Tax Withholding

−1.36K

Price / share

$130.19

Trade value

$177.19K

% of position

2.6%

3/5/2026

51.74K→50.38K

Common Stock

Direct

M · Option Exercise

+4.70K

Price / share

$42.25

Trade value

$198.57K

% of position

9.3%

3/5/2026

50.38K→55.08K

Common Stock

Direct

F · Tax Withholding

−3.19K

Price / share

$139.45

Trade value

$444.29K

% of position

5.8%

3/5/2026

55.08K→51.89K

Total

Net shares

−4.58K

Net value

-$3.47M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	3/4/2026	A · Award	+14.31K	—	—	34.3%	41.76K	56.07K
Common Stock Direct	3/4/2026	F · Tax Withholding	−7.70K	$139.45	$1.07M	13.7%	56.07K	48.38K
Common Stock Direct	3/4/2026	A · Award	+3.36K	—	—	6.9%	48.38K	51.74K
Common Stock Direct	3/4/2026	S · Sale	−14.71K	$134.21	$1.97M	28.3%	51.89K	37.18K
Common Stock Direct	3/5/2026	F · Tax Withholding	−1.36K	$130.19	$177.19K	2.6%	51.74K	50.38K
Common Stock Direct	3/5/2026	M · Option Exercise	+4.70K	$42.25	$198.57K	9.3%	50.38K	55.08K
Common Stock Direct	3/5/2026	F · Tax Withholding	−3.19K	$139.45	$444.29K	5.8%	55.08K	51.89K
Total			−4.58K		-$3.47M

Derivative Transactions1

Option - Right to Purchase

Direct

M · Option Exercise

Converts to

Common Stock

1.51K shares

+4.70K

Strike price

42.25

Held after

51.89K

Exercisable

—

3/5/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Option - Right to Purchase Direct	Common Stock1.51K shares	3/5/2026	M · Option Exercise	+4.70K	42.25	—	51.89K