OBERWEIS ASSET MANAGEMENT INC/

Position in CPRX — Catalyst Pharmaceuticals, Inc.

CIK 937886 LISLE, IL

Position in CPRX

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$19,326,913

+$5,627,034 QoQ

Shares Held

780,570

+33.0% QoQ

Ownership

0.638%

of shares outstanding

% of Portfolio

0.57%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Dec 2022

14 quarters on record

Voting authority Sole 97% Shared 0% None 3%

Healthcare · as of Mar 31, 2026

OBERWEIS ASSET MANAGEMENT INC/ holds $73,946,027 across 4 Biotechnology names. CPRX ranks #2 (26.1% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	ARQT	Arcutis Biotherapeutics, Inc.	1,365,941	$32,181,569
2	CPRX	Catalyst Pharmaceuticals, Inc. This page	780,570	$19,326,913
3	HALO	Halozyme Therapeutics, Inc.	219,930	$14,214,075
4	CRMD	CorMedix Inc.	1,211,115	$8,223,470

14 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$19,326,913	780,570	+33.0%	Shares	Sole	2026-05-15
2025-12-31	$13,699,879	586,970	+11.1%	Shares	Sole	2026-02-17
2025-09-30	$10,412,632	528,560	+12.9%	Shares	Sole	2025-11-17
2025-06-30	$10,159,940	468,200	+0.1%	Shares	Sole	2025-08-14
2025-03-31	$11,339,300	467,600	+0.1%	Shares	Sole	2025-05-15
2024-12-31	$9,748,377	467,100	+1.9%	Shares	Sole	2025-02-14
2024-09-30	$9,112,992	458,400	0.0%	Shares	Sole	2024-11-14
2024-06-30	$7,100,616	458,400	0.0%	Shares	Sole	2024-08-14
2024-03-31	$7,306,896	458,400	+31.5%	Shares	Sole	2024-05-15
2023-12-31	$5,859,966	348,600	+18.7%	Shares	Sole	2024-02-14
2023-09-30	$3,432,184	293,600	+60.1%	Shares	Sole	2023-11-14
2023-06-30	$2,464,896	183,400	+24.4%	Shares	Sole	2023-08-14
2023-03-31	$2,443,892	147,400	+52.6%	Shares	Sole	2023-05-15
2022-12-31	$1,796,760	96,600	—	Shares	Sole	2023-02-14
No filing history on record for this holder in this stock.