SIMPLEX TRADING, LLC

Position in PRLB — Proto Labs Inc

CIK 1488542 CHICAGO, IL

Position in PRLB

as of Jun 30, 2026 · filed Aug 12, 2026 Compact

Position Value

$14,345

-$600,273 QoQ

Shares Held

176

-98.4% QoQ

Ownership

0.001%

of shares outstanding

% of Portfolio

0.00%

of 13F equity value

Holder Rank

#221

of 276 holders

Holding Since

Mar 2020

15 quarters on record

Voting authority Sole 100% Shared 0% None 0%

Industrials · as of Jun 30, 2026

SIMPLEX TRADING, LLC holds $2,208,114 across 8 Metal Fabrication names. PRLB ranks #7 (0.6% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ATI	Ati Inc	6,203	$1,222,611
2	IIIN	Insteel Industries Inc	19,057	$575,521
3	GPGI	GPGI, Inc.	10,763	$170,593
4	WOR	Worthington Enterprises, Inc.	2,608	$140,206
5	MEC	Mayville Engineering Company, Inc.	1,529	$57,276
6	CMC	COMMERCIAL METALS Co	388	$24,347
7	PRLB	Proto Labs Inc This page	176	$14,345
8	TG	Tredegar Corp	404	$3,215

15 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-06-30	$14,345	176	-98.4%	Shares	Sole	2026-08-12
2026-03-31	$614,618	10,779	+3937.1%	Shares	Sole	2026-05-14
2025-09-30	$13,358	267	-77.0%	Shares	Sole	2025-11-12
2024-03-31	$41,505	1,161	-46.1%	Shares	Sole	2024-04-25
2023-12-31	$83,919	2,154	+44.5%	Shares	Sole	2024-02-02
2022-06-30	$71,329	1,491	-67.5%	Shares	Sole	2022-08-03
2022-03-31	$242,811	4,590	+829.1%	Shares	Sole	2022-05-02
2021-12-31	$25,366	494	-95.8%	Shares	Sole	2022-02-23
2021-09-30	$778,887	11,695	-0.1%	Shares	Sole	2021-10-28
2021-06-30	$1,074,794	11,708	+74.1%	Shares	Sole	2021-08-12
2021-03-31	$818,768	6,725	+741.7%	Shares	Sole	2021-04-26
2020-12-31	$122,566	799	-80.5%	Shares	Sole	2021-02-02
2020-09-30	$531,727	4,106	+41.7%	Shares	Sole	2020-10-14
2020-06-30	$325,825	2,897	+68.4%	Shares	Sole	2020-07-13
2020-03-31	$130,943	1,720	—	Shares	Sole	2020-04-29
No filing history on record for this holder in this stock.