Top 100 Contractors in NAICS 321: Wood Product Manufacturing, FY2021

Name: Top 100 Contractors in NAICS 321: Wood Product Manufacturing, FY2021
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 47% of FY2021 NAICS 321 contract dollars

Contract obligations: $168,504,845 Net of deobligations, by contracts coded NAICS 321 or a code under it
Contractors: 395 Parent companies with an obligation
Largest contractor: Aarcorp $24.3 million, 14.1% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Aarcorp Through AAR Manufacturing, Inc. Top agencies USAF (Department of the Air Force)	$24,276,134	14.1%	Rank history: #4 in FY2022, #4 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
2	Dad's Camper Outlet, LLC Top agencies DHS (Department of Homeland Security)	$9,045,983	5.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
3	PCI Support Services LLC Top agencies HHS (Department of Health and Human Services)	$8,311,875	4.8%	Rank history: #16 in FY2022, #8 in FY2023, #33 in FY2024 and #6 in FY2025; new, not ranked in FY2020.
4	S & S Forest Products, LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) Army (Department of the Army)	$7,511,562	4.4%	Rank history: #6 in FY2022, #7 in FY2023, #6 in FY2024 and #3 in FY2025; down 1 since FY2020.
5	Sherwood Lumber Corp Top agencies DLA (Defense Logistics Agency)	$7,104,414	4.1%	Rank history: #9 in FY2022, #10 in FY2023, #8 in FY2024 and #12 in FY2025; up 9 since FY2020.
6	Pro-Mark Services Inc. Top agencies DOI (Department of the Interior)	$6,530,605	3.8%	Rank history: #15 in FY2022 and not on the FY2023–FY2025 lists; down 4 since FY2020.
7	L. B. Foster Company Through CXT Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior) Army (Department of the Army)	$6,457,118	3.8%	Rank history: #12 in FY2022, #23 in FY2023, #48 in FY2024 and not on the FY2025 list; down 2 since FY2020.
8	Gana-A' Yoo, Limited 2 awardees, including Kaiyuh Services, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$4,182,405	2.4%	Rank history: #8 in FY2022, #9 in FY2023, #47 in FY2024 and not on the FY2025 list; down 1 since FY2020.
9	Integrated Modular Solutions, LLC Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) DHS (Department of Homeland Security)	$3,950,485	2.3%	Rank history: #22 in FY2022, #16 in FY2023, #5 in FY2024 and #14 in FY2025; down 1 since FY2020.
10	RV Retailer East LLC Top agencies DHS (Department of Homeland Security)	$3,715,844	2.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
11	Valcorp Enterprises LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) DOI (Department of the Interior)	$3,663,024	2.1%	Rank history: #62 in FY2022, #15 in FY2023, #83 in FY2024 and #69 in FY2025; up 30 since FY2020.
12	Boom Concrete Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$3,332,816	1.9%	Rank history: #36 in FY2022, #42 in FY2023, #29 in FY2024 and #42 in FY2025; up 3 since FY2020.
13	Choctaw Nation of Oklahoma Through Choctaw Defense Manufacturing LLC Top agencies Army (Department of the Army)	$3,203,278	1.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
14	Flick Lumber Co., Inc. Top agencies Army (Department of the Army)	$2,953,225	1.7%	Rank history: #73 in FY2022, #36 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
15	Gerling & Associates, Inc. Top agencies VA (Department of Veterans Affairs)	$2,727,864	1.6%	Rank history: not on the FY2022 list, #89 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
16	American Homestar Corporation Top agencies DHS (Department of Homeland Security)	$2,355,072	1.4%	Rank history: #64 in FY2022, #2 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
17	GSH of Alabama LLC Top agencies DHS (Department of Homeland Security)	$2,324,097	1.4%	Rank history: #3 in FY2022, #3 in FY2023, #4 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
18	Forest Products Distributors, Inc. Top agencies DLA (Defense Logistics Agency)	$2,283,083	1.3%	Rank history: #10 in FY2022, #22 in FY2023, #15 in FY2024 and #11 in FY2025; down 8 since FY2020.
19	Paw Paws Camper City Inc. Top agencies DHS (Department of Homeland Security)	$2,240,257	1.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
20	Bayou Outdoor Supercenter LLC Top agencies DHS (Department of Homeland Security)	$2,158,974	1.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
21	Strzelecki Enterprises Inc. Top agencies DHS (Department of Homeland Security)	$2,131,942	1.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
22	Lexington Homes, Inc. Top agencies DHS (Department of Homeland Security)	$2,130,696	1.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
23	Champion Home Builders Inc. Top agencies DHS (Department of Homeland Security)	$2,119,348	1.2%	Rank history: #1 in FY2022, #5 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
24	Gibbco LLC Top agencies DHS (Department of Homeland Security)	$2,040,941	1.2%	Rank history: #2 in FY2022, #1 in FY2023, not on the FY2024 list and #2 in FY2025; new, not ranked in FY2020.
25	Matheus Lumber Company, Inc. Top agencies Navy (Department of the Navy) USDA (Department of Agriculture)	$2,033,575	1.2%	Rank history: #14 in FY2022, #17 in FY2023, #14 in FY2024 and #15 in FY2025; down 9 since FY2020.
26	Williams Scotsman Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) Army (Department of the Army)	$1,765,078	1.0%	Rank history: #28 in FY2022, #53 in FY2023, #54 in FY2024 and not on the FY2025 list; down 9 since FY2020.
27	Sylvan Forest Products Inc. Top agencies DLA (Defense Logistics Agency)	$1,600,199	0.9%	Rank history: #11 in FY2022, #11 in FY2023, #13 in FY2024 and #18 in FY2025; down 4 since FY2020.
28	JP Whelan Co Top agencies DOE (Department of Energy)	$1,510,024	0.9%	Rank history: #20 in FY2022, #30 in FY2023, #19 in FY2024 and not on the FY2025 list; down 19 since FY2020.
29	Progressive Services Corp Top agencies DOJ (Department of Justice) DLA (Defense Logistics Agency)	$1,487,897	0.9%	Rank history: #17 in FY2022, #20 in FY2023, #20 in FY2024 and #16 in FY2025; down 10 since FY2020.
30	Superior Wood Products, Inc. Top agencies DOJ (Department of Justice)	$1,450,275	0.8%	Rank history: #19 in FY2022, #19 in FY2023, #18 in FY2024 and #32 in FY2025; down 12 since FY2020.
31	Clegg Industries Inc. Top agencies Navy (Department of the Navy)	$1,446,351	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
32	Berkshire Hathaway Inc. Through CMH Manufacturing, Inc. Top agencies DHS (Department of Homeland Security)	$1,370,802	0.8%	Rank history: #5 in FY2022, #13 in FY2023, #31 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
33	Bankston Motor Homes, Inc. Top agencies DHS (Department of Homeland Security)	$1,254,206	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
34	Government of the United States 2 awardees, including Federal Prison Industries, Inc. Top agencies GSA (General Services Administration)	$1,164,717	0.7%	Rank history: #30 in FY2022, #25 in FY2023, #21 in FY2024 and #21 in FY2025; down 1 since FY2020.
35	Haroldson Group International, LLC Top agencies DLA (Defense Logistics Agency) Army (Department of the Army) DOI (Department of the Interior)	$988,004	0.6%	Rank history: #24 in FY2022, #32 in FY2023 and not on the FY2024–FY2025 lists; down 9 since FY2020.
36	Cavco Industries, Inc. Through Lexington Homes, Inc. Top agencies DHS (Department of Homeland Security)	$977,859	0.6%	Rank history: #26 in FY2022, #6 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
37	Ganahl Lumber Company Top agencies Navy (Department of the Navy)	$915,169	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
38	Falvo Manufacturing Co., Inc. Top agencies Army (Department of the Army)	$881,477	0.5%	Rank history: #32 in FY2022, not on the FY2023 list, #42 in FY2024 and not on the FY2025 list; up 29 since FY2020.
39	South Central Pallets Inc. Top agencies Army (Department of the Army)	$812,881	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
40	Asrc Prime Constructors, LLC Top agencies Army (Department of the Army)	$753,883	0.4%	Rank history: #49 in FY2022, #57 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
41	Sherman RV Center, L.L.C. Top agencies DHS (Department of Homeland Security)	$751,127	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
42	Treen Box & Pallet, Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$749,114	0.4%	Rank history: #39 in FY2022 and not on the FY2023–FY2025 lists; down 12 since FY2020.
43	Owens Corning Through Hughes Brothers Inc. Top agencies DOE (Department of Energy)	$731,649	0.4%	Rank history: #21 in FY2022, #26 in FY2023 and not on the FY2024–FY2025 lists; down 16 since FY2020.
44	G - L Veneer Co., Inc. Top agencies DOJ (Department of Justice)	$725,886	0.4%	Rank history: #18 in FY2022, #38 in FY2023, #72 in FY2024 and #70 in FY2025; down 10 since FY2020.
45	Continental Flooring Co Top agencies VA (Department of Veterans Affairs) DOS (Department of State)	$671,752	0.4%	Rank history: not on the FY2022–FY2025 lists; up 18 since FY2020.
46	Palomar Modular Buildings LLC Top agencies HHS (Department of Health and Human Services) Army (Department of the Army)	$655,032	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
47	Birchland Plywood - Veneer Limited Top agencies DOJ (Department of Justice)	$638,433	0.4%	Rank history: #40 in FY2022, #29 in FY2023, #37 in FY2024 and #43 in FY2025; down 19 since FY2020.
48	GWG Wood Group, Inc. Top agencies Army (Department of the Army) DOJ (Department of Justice)	$580,000	0.3%	Rank history: not on the FY2022–FY2023 lists, #25 in FY2024 and #56 in FY2025; down 27 since FY2020.
49	Mitig Company, LLC Top agencies DOE (Department of Energy)	$571,215	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	Creative Logistics Ltd Top agencies GSA (General Services Administration)	$538,065	0.3%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; down 15 since FY2020.
51	American Classic Construction Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior) DOS (Department of State)	$512,585	0.3%	Rank history: #34 in FY2022, #37 in FY2023, #40 in FY2024 and #67 in FY2025; up 13 since FY2020.
52	Modular Genius Inc. Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) DOI (Department of the Interior)	$512,542	0.3%	Rank history: #25 in FY2022, #33 in FY2023, #28 in FY2024 and #77 in FY2025; down 30 since FY2020.
53	Northwest Ranch Supply Inc. Top agencies USDA (Department of Agriculture)	$500,216	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
54	Mil-Spec Packaging of Ga., Inc. 2 awardees, including Boyd's Industrial Woodwork, Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$492,182	0.3%	Rank history: #23 in FY2022, #34 in FY2023, #23 in FY2024 and #22 in FY2025; down 1 since FY2020.
55	BSE Performance, LLC Top agencies USAF (Department of the Air Force) DOI (Department of the Interior) Army (Department of the Army)	$491,821	0.3%	Rank history: #31 in FY2022, #28 in FY2023, #30 in FY2024 and #28 in FY2025; down 26 since FY2020.
56	J & M Mobile Homes, Inc. Top agencies DHS (Department of Homeland Security)	$454,330	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
57	Georgia State of Through Georgia Department of Human Services Top agencies DLA (Defense Logistics Agency)	$449,429	0.3%	Rank history: #45 in FY2022, #46 in FY2023 and not on the FY2024–FY2025 lists; down 17 since FY2020.
58	Lumber Specialists, Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$433,614	0.3%	Rank history: #42 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
59	I-49 Trailer and R.V S, Inc. Top agencies DHS (Department of Homeland Security)	$433,600	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
60	Dresser-Argus, Inc. Top agencies DLA (Defense Logistics Agency)	$429,350	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Kelly's RV Inc. Top agencies DHS (Department of Homeland Security)	$415,729	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
62	Gulf Holdings, LLC Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy) DOT (Department of Transportation)	$414,564	0.2%	Rank history: not on the FY2022–FY2025 lists; up 52 since FY2020.
63	Colerain Trailer Center, LLC Top agencies DHS (Department of Homeland Security)	$411,400	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	J.d. Packaging Group, Inc. Top agencies Navy (Department of the Navy)	$409,494	0.2%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; up 21 since FY2020.
65	Wheeland Lumber Co. Inc. Top agencies DOJ (Department of Justice)	$382,671	0.2%	Rank history: #68 in FY2022, #51 in FY2023, not on the FY2024 list and #45 in FY2025; down 20 since FY2020.
66	Phoenix Contracting LLC Top agencies Army (Department of the Army) USDA (Department of Agriculture)	$382,669	0.2%	Rank history: not on the FY2022 list, #56 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
67	Mccune Lumber Company Top agencies Army (Department of the Army)	$364,924	0.2%	Rank history: #48 in FY2022, #55 in FY2023, #43 in FY2024 and #60 in FY2025; down 16 since FY2020.
68	Forest Concepts LLC Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$357,776	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
69	Harbor Fed Con LLC Top agencies USAF (Department of the Air Force)	$348,000	0.2%	Rank history: #55 in FY2022, #54 in FY2023, #46 in FY2024 and #62 in FY2025; down 58 since FY2020.
70	Pacific Mobile Structures, Inc. Top agencies HHS (Department of Health and Human Services) Army (Department of the Army) VA (Department of Veterans Affairs)	$337,960	0.2%	Rank history: #35 in FY2022, #62 in FY2023, #17 in FY2024 and not on the FY2025 list; up 16 since FY2020.
71	Brandt Group, Inc. Top agencies Navy (Department of the Navy)	$300,300	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Pacific Timber Products LLC Top agencies USDA (Department of Agriculture)	$290,460	0.2%	Rank history: #97 in FY2022, #86 in FY2023, #58 in FY2024 and not on the FY2025 list; up 6 since FY2020.
73	AQ Management and Constructions LLC Top agencies Army (Department of the Army)	$289,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	B & H International LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$286,009	0.2%	Rank history: #33 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; down 70 since FY2020.
75	Clamshell Structures Inc. Top agencies DLA (Defense Logistics Agency)	$273,246	0.2%	Rank history: not on the FY2022 list, #78 in FY2023 and not on the FY2024–FY2025 lists; down 33 since FY2020.
76	Mason Forest Products Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$259,222	0.2%	Rank history: not on the FY2022 list, #76 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
77	Newview Oklahoma, Inc. Top agencies DLA (Defense Logistics Agency)	$244,755	0.1%	Rank history: #59 in FY2022, #69 in FY2023, #56 in FY2024 and #50 in FY2025; up 137 since FY2020.
78	Vesta Housing Solutions, LLC Top agencies USAF (Department of the Air Force)	$232,720	0.1%	Rank history: not on the FY2022 list, #100 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
79	Building Products Plus, LLC Top agencies Army (Department of the Army)	$231,768	0.1%	Rank history: not on the FY2022–FY2025 lists; up 62 since FY2020.
80	Volunteer Lumber Sales, Inc. Top agencies Army (Department of the Army)	$231,608	0.1%	Rank history: #54 in FY2022, #77 in FY2023, #62 in FY2024 and #66 in FY2025; down 6 since FY2020.
81	Zdaas LLC Top agencies Army (Department of the Army)	$225,621	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Sungeun Global Co.,Ltd Top agencies Army (Department of the Army)	$225,483	0.1%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
83	Gem Defense Solutions LLC Top agencies Army (Department of the Army) USDA (Department of Agriculture)	$222,357	0.1%	Rank history: #50 in FY2022, #60 in FY2023, not on the FY2024 list and #31 in FY2025; down 45 since FY2020.
84	JKW LLC Top agencies Army (Department of the Army)	$219,482	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	Logistics365 Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$217,955	0.1%	Rank history: #72 in FY2022 and not on the FY2023–FY2025 lists; up 247 since FY2020.
86	Don Elthon Top agencies DLA (Defense Logistics Agency)	$205,315	0.1%	Rank history: #67 in FY2022, #97 in FY2023, #57 in FY2024 and #55 in FY2025; down 13 since FY2020.
87	Stealth Supply, Inc. Top agencies DLA (Defense Logistics Agency)	$193,446	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	MM Packaging Products Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$190,279	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	The T H Rogers Lumber Company Through The T.h. Rogers Lumber Company Top agencies Army (Department of the Army)	$182,920	0.1%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
90	Redleg Fencing, LLC Top agencies DOI (Department of the Interior)	$169,663	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	E.m. Oil Transport, Inc. Top agencies Army (Department of the Army)	$168,769	0.1%	Rank history: not on the FY2022–FY2025 lists; down 16 since FY2020.
92	Pioneer Industries, LLC Top agencies DLA (Defense Logistics Agency)	$166,293	0.1%	Rank history: #71 in FY2022 and not on the FY2023–FY2025 lists; up 20 since FY2020.
93	On the Fly Moving Inc. Top agencies DOI (Department of the Interior)	$165,054	0.1%	Rank history: not on the FY2022–FY2025 lists; up 42 since FY2020.
94	Western Wood Structures, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$161,352	0.1%	Rank history: not on the FY2022 list, #88 in FY2023, #68 in FY2024 and not on the FY2025 list; up 163 since FY2020.
95	Goodwill Industries of South Texas Contract Services, Inc. Top agencies Army (Department of the Army)	$156,400	0.1%	Rank history: not on the FY2022 list, #58 in FY2023, #53 in FY2024 and #53 in FY2025; new, not ranked in FY2020.
96	Cutter Lumber Products Top agencies DLA (Defense Logistics Agency) Treasury (Department of the Treasury)	$156,159	0.1%	Rank history: not on the FY2022 list, #21 in FY2023, #9 in FY2024 and #10 in FY2025; up 2 since FY2020.
97	Wisecom Technologies Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$153,986	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Alta Max LLC Top agencies Army (Department of the Army)	$153,142	0.1%	Rank history: #52 in FY2022, #27 in FY2023, #90 in FY2024 and #49 in FY2025; down 51 since FY2020.
99	Robert Isaacs Custom Homes LLC Top agencies Army (Department of the Army)	$152,147	0.1%	Rank history: #44 in FY2022, not on the FY2023 list, #65 in FY2024 and #54 in FY2025; down 42 since FY2020.
100	Sustap LLC Top agencies Treasury (Department of the Treasury)	$149,248	0.1%	Rank history: not on the FY2022–FY2025 lists; down 13 since FY2020.

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100 of 395 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 321

Code	Net obligations	Largest contractor
3219 Other Wood Product Manufacturing	$134,200,812	Aarcorp
3212 Veneer, Plywood, and Engineered Wood Product Manufacturing	$26,376,083	S & S Forest Products, LLC
3211 Sawmills and Wood Preservation	$7,927,950	JP Whelan Co

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 $172 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 2021 ran Oct 1, 2020 – Sep 30, 2021. 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 FY2020. "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 FY2020 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 NAICS 321 contractors in FY2021?

1. Aarcorp ($24.3M), 2. Dad's Camper Outlet, LLC ($9.05M), 3. PCI Support Services LLC ($8.31M), 4. S & S Forest Products, LLC ($7.51M), 5. Sherwood Lumber Corp ($7.1M), 6. Pro-Mark Services Inc. ($6.53M), 7. L. B. Foster Company ($6.46M), 8. Gana-A' Yoo, Limited ($4.18M), 9. Integrated Modular Solutions, LLC ($3.95M), 10. RV Retailer East LLC ($3.72M).

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