Top 36 Contractors in PSC H359: Inspection and Laboratory Services (except medical/dental): Electrical and Electronic Equipment Components, FY2025

Parent companies by net contract obligations Oct 1, 2024 – Sep 30, 2025 Code page on GovTribe

The top 10 won 55% of FY2025 PSC H359 contract dollars

Ranking facts

Contract obligations
$1,223,019 Net of deobligations, by contracts coded PSC H359
Contractors
40 Parent companies with an obligation
Largest contractor
William Henderson LLC $159 thousand, 9.6% of obligations
Data as of

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 36 rows as CSV

Full ranking

Rank Contractor Net obligations Share Trend
1
William Henderson LLC
$158,794
Rank history: not on the FY2021–FY2022 lists, #5 in FY2023 and #5 in FY2024; up 4 since FY2024.
2 $157,130
Rank history: #4 in FY2021, #7 in FY2022, not on the FY2023 list and #3 in FY2024; up 1 since FY2024.
3 $99,024
Rank history: not on the FY2021–FY2023 lists and #7 in FY2024; up 4 since FY2024.
4 $98,923
Rank history: not on the FY2021 list, #18 in FY2022, #12 in FY2023 and #1 in FY2024; down 3 since FY2024.
5 $77,753
Rank history: not on the FY2021–FY2024 lists; new.
6 $71,107
Rank history: not on the FY2021–FY2024 lists; new.
7 $69,400
Rank history: #29 in FY2021 and not on the FY2022–FY2024 lists; returned.
8
Software Information Resource Corp
$64,702
Rank history: not on the FY2021–FY2024 lists; new.
9 $55,179
Rank history: #10 in FY2021, #10 in FY2022, #15 in FY2023 and #8 in FY2024; down 1 since FY2024.
10 $54,394
Rank history: not on the FY2021–FY2024 lists; new.
11 $46,589
Rank history: not on the FY2021–FY2023 lists and #10 in FY2024; down 1 since FY2024.
12 $42,436
Rank history: not on the FY2021–FY2024 lists; new.
13 $40,276
Rank history: not on the FY2021–FY2024 lists; new.
14 $40,056
Rank history: not on the FY2021–FY2024 lists; new.
15 $33,290
Rank history: not on the FY2021–FY2024 lists; new.
16 $30,324
Rank history: #14 in FY2021, #16 in FY2022, #11 in FY2023 and #12 in FY2024; down 4 since FY2024.
17 $29,980
Rank history: not on the FY2021–FY2022 lists, #10 in FY2023 and #14 in FY2024; down 3 since FY2024.
18 $29,244
Rank history: not on the FY2021 list, #14 in FY2022, #4 in FY2023 and #6 in FY2024; down 12 since FY2024.
19 $24,000
Rank history: not on the FY2021–FY2024 lists; new.
20 $22,008
Rank history: not on the FY2021 list, #24 in FY2022, #17 in FY2023 and #19 in FY2024; down 1 since FY2024.
21
Asco Power Services Inc Through Schneider Electric Usa, Inc.
$19,134
Rank history: not on the FY2021–FY2023 lists and #21 in FY2024; unchanged since FY2024.
22 $19,000
Rank history: not on the FY2021–FY2024 lists; new.
23 $16,780
Rank history: not on the FY2021–FY2024 lists; new.
24 $14,054
Rank history: not on the FY2021 list, #28 in FY2022, #20 in FY2023 and #20 in FY2024; down 4 since FY2024.
25 $13,719
Rank history: not on the FY2021–FY2024 lists; new.
26
Mechantech Inc
$11,613
Rank history: not on the FY2021–FY2024 lists; new.
27 $10,713
Rank history: #28 in FY2021, #33 in FY2022, #26 in FY2023 and #27 in FY2024; unchanged since FY2024.
28 $8,800
Rank history: not on the FY2021–FY2024 lists; new.
29 $8,412
Rank history: not on the FY2021–FY2023 lists and #22 in FY2024; down 7 since FY2024.
30
Admiral Elevator Company Inc.
$8,240
Rank history: not on the FY2021–FY2023 lists and #30 in FY2024; unchanged since FY2024.
31 $7,815
Rank history: not on the FY2021–FY2023 lists and #25 in FY2024; down 6 since FY2024.
32 $6,590
Rank history: not on the FY2021 list, #27 in FY2022, #30 in FY2023 and #33 in FY2024; up 1 since FY2024.
33 $4,945
Rank history: not on the FY2021–FY2024 lists; new.
34 $3,300
Rank history: not on the FY2021–FY2024 lists; new.
35 $2,880
Rank history: not on the FY2021–FY2023 lists and #37 in FY2024; up 2 since FY2024.
36
Twining Inc.
$674
Rank history: not on the FY2021–FY2024 lists; new.
Show 11 more

36 of 40 contractors listed here. See the rest on GovTribe.

How this ranking works

  • Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
  • Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $1.65 million obligated before deobligations, so they never pass 100%.
  • Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
  • Fiscal year 2025 ran Oct 1, 2024 – Sep 30, 2025. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
  • Rank changes compare with FY2024. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
  • Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2024 takes the color of the rank change beside it.
  • Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 PSC H359 contractors in FY2025?

1. William Henderson LLC ($159K), 2. Electrical Instrumentation and Controls, Inc. ($157K), 3. Waste Connections of Alaska, Inc. ($99K), 4. Pacific Coast Contracting Group ($98.9K), 5. Electrical Engineering Enterprises, Inc. ($77.8K), 6. Converse Construction, Inc. ($71.1K), 7. Multivariable Systems Tech, LLC ($69.4K), 8. Software Information Resource Corp ($64.7K), 9. Nihon Highway Service Co.,Ltd. ($55.2K), 10. Eaton Corporation ($54.4K).

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