OBERWEIS ASSET MANAGEMENT INC/

Position in FSS — Federal Signal Corp /De/

CIK 937886 LISLE, IL

Position in FSS

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

Position Value

$28,941,940

+$10,861,705 QoQ

Shares Held

267,634

+60.7% QoQ

Ownership

0.439%

of shares outstanding

% of Portfolio

0.86%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2020

17 quarters on record

Voting authority Sole 100.ToString("F0")% Shared 0.ToString("F0")% None 0.ToString("F0")%

Industrials · as of Mar 31, 2026

OBERWEIS ASSET MANAGEMENT INC/ holds $51,335,817 across 3 Farm & Heavy Construction Machinery names. FSS ranks #1 (56.4% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	FSS	Federal Signal Corp /De/ This page	267,634	$28,941,940
2	BLBD	Blue Bird Corp	389,238	$22,104,826
3	CAT	Caterpillar Inc	408	$289,051

17 filing rows on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$28,941,940	267,634	+60.7%	Shares	Sole	2026-05-15
2025-12-31	$18,080,235	166,500	0.0%	Shares	Sole	2026-02-17
2025-09-30	$19,811,835	166,500	0.0%	Shares	Sole	2025-11-17
2025-06-30	$17,718,930	166,500	-27.6%	Shares	Sole	2025-08-14
2025-03-31	$16,903,996	229,830	0.0%	Shares	Sole	2025-05-15
2024-12-31	$21,233,993	229,830	+21.1%	Shares	Sole	2025-02-14
2024-09-30	$17,732,165	189,730	+22.1%	Shares	Sole	2024-11-14
2024-06-30	$12,996,461	155,330	+21.5%	Shares	Sole	2024-08-14
2024-03-31	$10,848,932	127,830	+29.3%	Shares	Sole	2024-05-15
2023-12-31	$7,584,214	98,830	+8.1%	Shares	Sole	2024-02-14
2023-09-30	$5,459,322	91,400	+23.7%	Shares	Sole	2023-11-14
2023-06-30	$4,731,817	73,900	+26.8%	Shares	Sole	2023-08-14
2023-03-31	$3,160,443	58,300	+2.1%	Shares	Sole	2023-05-15
2022-12-31	$2,653,437	57,100	+26.9%	Shares	Sole	2023-02-14
2022-09-30	$1,679,400	45,000	+265.9%	Shares	Sole	2022-11-14
2020-06-30	$365,679	12,300	-60.8%	Shares	Sole	2020-08-14
2020-03-31	$856,864	31,410	—	Shares	Sole	2020-05-15
No filing history on record for this holder in this stock.