Federal Signal Corporation
US ˙ NYSE ˙ US3138551086

SecurityFSS / Federal Signal Corporation
InstitutionDriehaus Capital Management Llc
Latest Disclosed Ownership339,442 shares
Latest Disclosed Value $ 36,707,258
Driehaus Capital Management Llc reports 0.64% decrease in ownership of FSS / Federal Signal Corporation

On May 15, 2026 - Driehaus Capital Management Llc filed a 13F-HR form disclosing ownership of 339,442 shares of Federal Signal Corporation (US:FSS) valued at $36,707,258 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 341,624 shares of Federal Signal Corporation. This represents a change in shares of -0.64% during the quarter. The current value of the position is $36,364,421 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F Federal Signal COM 313855108 339,442 -2,182 -0.64 36,707 -1.05 0.2689
2026-02-17 2025-12-31 13F Federal Signal COM 313855108 341,624 -102,961 -23.16 37,097 -29.88 0.2520
2025-11-14 2025-09-30 13F FEDERAL SIGNAL COM 313855108 444,585 1,197 0.27 52,901 12.11 0.3789
2025-08-14 2025-06-30 13F FEDERAL SIGNAL COM 313855108 443,388 13,941 3.25 47,185 49.39 0.3775
2025-05-15 2025-03-31 13F FEDERAL SIGNAL COM 313855108 429,447 -166,533 -27.94 31,586 -42.64 0.3045
2025-02-14 2024-12-31 13F FEDERAL SIGNAL COM 313855108 595,980 -250,090 -29.56 55,063 -30.37 0.4544
2024-11-14 2024-09-30 13F FEDERAL SIGNAL COM 313855108 846,070 -66,322 -7.27 79,074 3.58 0.6788
2024-08-15 2024-06-30 13F/A-1 FEDERAL SIGNAL COM 313855108 912,392 153,765 20.27 76,340 18.57 0.7385
2024-08-14 2024-06-30 13F FEDERAL SIGNAL COM 313855108 912,392 153,765 76,340 0.7360
2024-05-15 2024-03-31 13F FEDERAL SIGNAL COM 313855108 758,627 -105,209 -12.18 64,385 -2.88 0.6414
2024-02-14 2023-12-31 13F FEDERAL SIGNAL COM 313855108 863,836 28,232 3.38 66,291 32.82 0.7986
2023-11-14 2023-09-30 13F FEDERAL SIGNAL COM 313855108 835,604 -844 -0.10 49,911 -6.81 0.6488
2023-08-14 2023-06-30 13F FEDERAL SIGNAL COM 313855108 836,448 22,427 2.76 53,558 21.37 0.6762
2023-05-15 2023-03-31 13F FEDERAL SIGNAL COM 313855108 814,021 394,482 94.03 44,128 126.36 0.6194
2023-02-14 2022-12-31 13F FEDERAL SIGNAL COM 313855108 419,539 273,799 187.87 19,496 258.43 0.2907
2022-11-14 2022-09-30 13F FEDERAL SIGNAL COM 313855108 145,740 145,740 5,439 0.0824
2020-08-14 2020-06-30 13F FEDERAL SIGNAL COM 313855108 0 -177,575 -100.00 0 -100.00
2020-05-15 2020-03-31 13F FEDERAL SIGNAL COM 313855108 177,575 -88,354 -33.22 4,844 -43.52 0.1618
2020-02-12 2019-12-31 13F FEDERAL SIGNAL COM 313855108 265,929 60,705 29.58 8,576 27.64 0.2280
2019-11-14 2019-09-30 13F FEDERAL SIGNAL COM 313855108 205,224 205,224 6,719 0.2186
2019-02-14 2018-12-31 13F FEDERAL SIGNAL COM 313855108 0 -79,872 -100.00 0 -100.00
2018-11-14 2018-09-30 13F FEDERAL SIGNAL COM 313855108 79,872 -37,799 -32.12 2,139 -21.96 0.0658
2018-08-14 2018-06-30 13F FEDERAL SIGNAL COM 313855108 117,671 35,315 42.88 2,741 51.19 0.0926
2018-05-15 2018-03-31 13F FEDERAL SIGNAL COM 313855108 82,356 -145,674 -63.88 1,813 -60.42 0.0640
2018-02-14 2017-12-31 13F FEDERAL SIGNAL COM 313855108 228,030 -95,474 -29.51 4,581 -33.45 0.1738
2017-11-14 2017-09-30 13F FEDERAL SIGNAL COM 313855108 323,504 33,150 11.42 6,884 36.56 0.2683
2017-08-14 2017-06-30 13F FEDERAL SIGNAL COM 313855108 290,354 197,817 213.77 5,041 271.76 0.1853
2014-02-13 2013-12-31 13F Federal Signal COM 313855108 92,537 -30,319 -24.68 1,356 -14.23 0.0489
2013-11-14 2013-09-30 13F Federal Signal COM 313855108 122,856 122,856 1,581 0.0611
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.