Top 100 Contractors in NAICS 56171: Exterminating and Pest Control Services, FY2021

Name: Top 100 Contractors in NAICS 56171: Exterminating and Pest Control Services, FY2021
Creator: GovTribe

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

The top 10 won 46% of FY2021 NAICS 56171 contract dollars

Contract obligations: $37,429,262 Net of deobligations, by contracts coded NAICS 56171 or a code under it
Contractors: 305 Parent companies with an obligation
Largest contractor: Accord Federal Services, LLC $3.65 million, 8.8% 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	Accord Federal Services, LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) Navy (Department of the Navy)	$3,649,014	8.8%	Rank history: #1 in FY2022, #1 in FY2023, #5 in FY2024 and #5 in FY2025; unchanged since FY2020.
2	Pestmaster Services, L.P. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) USAF (Department of the Air Force)	$3,192,862	7.7%	Rank history: #4 in FY2022, #7 in FY2023, #11 in FY2024 and #20 in FY2025; unchanged since FY2020.
3	CDS Services Inc. Top agencies VA (Department of Veterans Affairs) DOI (Department of the Interior) DHS (Department of Homeland Security)	$2,654,545	6.4%	Rank history: #2 in FY2022, #2 in FY2023, #2 in FY2024 and #1 in FY2025; unchanged since FY2020.
4	American Pest Management Inc. Top agencies HHS (Department of Health and Human Services) GSA (General Services Administration) National Gallery of Art	$2,101,324	5.1%	Rank history: #7 in FY2022, #4 in FY2023, #4 in FY2024 and #2 in FY2025; unchanged since FY2020.
5	Alexandria Pest Services, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) SSA (Social Security Administration)	$2,003,052	4.9%	Rank history: #5 in FY2022, #5 in FY2023, #6 in FY2024 and #4 in FY2025; unchanged since FY2020.
6	Worrell Contracting Co Inc. Top agencies VA (Department of Veterans Affairs)	$1,310,656	3.2%	Rank history: #9 in FY2022, #9 in FY2023, #23 in FY2024 and not on the FY2025 list; up 1 since FY2020.
7	Rollins, Inc. 4 awardees, including Orkin, LLC, Mccall Service NW, LLC and Northwest Exterminating Co LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) DHS (Department of Homeland Security)	$1,243,594	3.0%	Rank history: #10 in FY2022, #6 in FY2023, #25 in FY2024 and not on the FY2025 list; up 5 since FY2020.
8	Cuebid Technologies Inc. Top agencies Army (Department of the Army)	$1,209,347	2.9%	Rank history: not on the FY2022 list, #46 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
9	Galaide Professional Services Inc. Top agencies Navy (Department of the Navy) DODEA (Department of Defense Education Activity) DLA (Defense Logistics Agency)	$890,056	2.2%	Rank history: #11 in FY2022, #11 in FY2023, #9 in FY2024 and #7 in FY2025; unchanged since FY2020.
10	AMD CM LLC Top agencies Navy (Department of the Navy)	$799,314	1.9%	Rank history: #13 in FY2022, #13 in FY2023, #10 in FY2024 and not on the FY2025 list; up 1 since FY2020.
11	Michael Franco Inc. Top agencies Navy (Department of the Navy)	$688,387	1.7%	Rank history: #15 in FY2022, #12 in FY2023, #17 in FY2024 and #23 in FY2025; up 15 since FY2020.
12	Rentokil Initial PLC 3 awardees, including Rentokil North America, Inc. and Florida Pest Control & Chemical Co. Top agencies DECA (Defense Commissary Agency) Army (Department of the Army) Navy (Department of the Navy)	$680,294	1.6%	Rank history: #12 in FY2022, #14 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
13	I.m.d.c Incorporated Top agencies USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$653,970	1.6%	Rank history: #16 in FY2022, #15 in FY2023, #8 in FY2024 and not on the FY2025 list; up 278 since FY2020.
14	Pride Industries Top agencies Navy (Department of the Navy)	$616,568	1.5%	Rank history: #8 in FY2022, #8 in FY2023, #7 in FY2024 and #6 in FY2025; unchanged since FY2020.
15	Orem Enterprises. LLC Top agencies Navy (Department of the Navy)	$556,076	1.3%	Rank history: #18 in FY2022, #17 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
16	Chugach Alaska Corporation Through Chugach Consolidated Solutions, LLC Top agencies Navy (Department of the Navy)	$504,554	1.2%	Rank history: #23 in FY2022, #24 in FY2023, #20 in FY2024 and not on the FY2025 list; up 9 since FY2020.
17	Air Partner PLC Through Safeskys Limited Top agencies USAF (Department of the Air Force)	$480,232	1.2%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
18	A & M Exterminating Services Inc. Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security)	$395,164	1.0%	Rank history: #20 in FY2022, #19 in FY2023, #18 in FY2024 and #13 in FY2025; up 5 since FY2020.
19	Cole J Church Top agencies Army (Department of the Army)	$395,153	1.0%	Rank history: #52 in FY2022 and not on the FY2023–FY2025 lists; up 29 since FY2020.
20	Terminix International Company Limited Partnership the 6 awardees, including Rentokil North America, Inc. and Copesan Services, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army) DHS (Department of Homeland Security)	$393,908	1.0%	Rank history: #28 in FY2022, #68 in FY2023, #58 in FY2024 and not on the FY2025 list; up 8 since FY2020.
21	Eastern Aviation LLC Top agencies Army (Department of the Army)	$370,955	0.9%	Rank history: #41 in FY2022, #23 in FY2023, #21 in FY2024 and #17 in FY2025; up 10 since FY2020.
22	Kaigan LLC Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$324,622	0.8%	Rank history: #32 in FY2022, #34 in FY2023, #64 in FY2024 and #82 in FY2025; up 10 since FY2020.
23	Florida Keys Mosquito Control District Top agencies Navy (Department of the Navy)	$315,130	0.8%	Rank history: #31 in FY2022, #28 in FY2023, #28 in FY2024 and #24 in FY2025; up 7 since FY2020.
24	Superior Tasking Advantage Contracting, Inc. Top agencies Army (Department of the Army)	$310,363	0.8%	Rank history: #33 in FY2022, #16 in FY2023, #32 in FY2024 and #47 in FY2025; up 5 since FY2020.
25	APC AG Top agencies Army (Department of the Army)	$293,164	0.7%	Rank history: #68 in FY2022, #63 in FY2023, #59 in FY2024 and #63 in FY2025; up 24 since FY2020.
26	Getem Manufacturing Company, Incorporated Top agencies Army (Department of the Army)	$291,884	0.7%	Rank history: #26 in FY2022, #22 in FY2023, #33 in FY2024 and #25 in FY2025; up 1 since FY2020.
27	Mid Pacific Pest Control Inc. Top agencies DOI (Department of the Interior)	$280,782	0.7%	Rank history: #39 in FY2022, not on the FY2023 list, #47 in FY2024 and not on the FY2025 list; up 6 since FY2020.
28	R J Promotions, Inc. Top agencies USAF (Department of the Air Force)	$265,818	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
29	Best Pest Control Top agencies Army (Department of the Army)	$264,134	0.6%	Rank history: #49 in FY2022, #26 in FY2023, #30 in FY2024 and not on the FY2025 list; down 5 since FY2020.
30	Precise Management, Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$250,235	0.6%	Rank history: #21 in FY2022, #20 in FY2023, #31 in FY2024 and #37 in FY2025; up 8 since FY2020.
31	Guardian Pest Solutions Inc. Top agencies VA (Department of Veterans Affairs) DOI (Department of the Interior)	$246,671	0.6%	Rank history: #74 in FY2022, #39 in FY2023, #46 in FY2024 and #33 in FY2025; up 4 since FY2020.
32	Intertec, Incorporated Top agencies Navy (Department of the Navy)	$235,602	0.6%	Rank history: #24 in FY2022, #38 in FY2023, #40 in FY2024 and #36 in FY2025; up 2 since FY2020.
33	Nfcf Enterprises Inc. Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$229,582	0.6%	Rank history: #50 in FY2022, #54 in FY2023 and not on the FY2024–FY2025 lists; up 21 since FY2020.
34	Triple S Termite & Pest Control Inc. Top agencies WHS (DOD Washington Headquarters Service) DOI (Department of the Interior)	$223,192	0.5%	Rank history: #35 in FY2022, #62 in FY2023 and not on the FY2024–FY2025 lists; up 24 since FY2020.
35	Mtnt Construction, LLC Top agencies Army (Department of the Army)	$221,343	0.5%	Rank history: #54 in FY2022 and not on the FY2023–FY2025 lists; down 13 since FY2020.
36	Hyko Solutions LLC Top agencies VA (Department of Veterans Affairs)	$220,284	0.5%	Rank history: not on the FY2022 list, #99 in FY2023, #99 in FY2024 and #50 in FY2025; up 121 since FY2020.
37	Rantech, Inc. Top agencies VA (Department of Veterans Affairs)	$207,000	0.5%	Rank history: #45 in FY2022, #45 in FY2023, #84 in FY2024 and not on the FY2025 list; unchanged since FY2020.
38	Sustainable Pest Systems, Inc. Top agencies Navy (Department of the Navy)	$201,180	0.5%	Rank history: #47 in FY2022 and not on the FY2023–FY2025 lists; up 9 since FY2020.
39	Invasive Plant Control, Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army)	$198,396	0.5%	Rank history: not on the FY2022–FY2025 lists; down 3 since FY2020.
40	Piepenbrock Unternehmensgruppe GMBH + Co. KG Through Piepenbrock Government Services GMBH + Co. KG Top agencies Army (Department of the Army)	$196,307	0.5%	Rank history: not on the FY2022–FY2025 lists; down 25 since FY2020.
41	Matuszak-Hygiene GMBH & Co. KG Top agencies Army (Department of the Army)	$194,436	0.5%	Rank history: #14 in FY2022, #64 in FY2023, #15 in FY2024 and #34 in FY2025; new, not ranked in FY2020.
42	Valleyscapes Inc. Top agencies VA (Department of Veterans Affairs)	$183,469	0.4%	Rank history: #27 in FY2022 and not on the FY2023–FY2025 lists; down 26 since FY2020.
43	Diverse Pest Management Top agencies USAF (Department of the Air Force)	$180,306	0.4%	Rank history: #46 in FY2022, #42 in FY2023, #39 in FY2024 and #30 in FY2025; down 2 since FY2020.
44	Evergreen Construction & Consulting Inc. Top agencies Navy (Department of the Navy)	$180,288	0.4%	Rank history: #53 in FY2022, #33 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
45	Parliament LLC Top agencies Navy (Department of the Navy)	$179,584	0.4%	Rank history: #96 in FY2022, #52 in FY2023, #41 in FY2024 and #39 in FY2025; up 58 since FY2020.
46	Schädlingsbekämpfungs GMBH Hainichen Top agencies Army (Department of the Army)	$168,339	0.4%	Rank history: #29 in FY2022, #32 in FY2023, #34 in FY2024 and #32 in FY2025; down 6 since FY2020.
47	Militerriers Inc. Top agencies VA (Department of Veterans Affairs)	$164,344	0.4%	Rank history: #34 in FY2022, #18 in FY2023, #24 in FY2024 and #26 in FY2025; up 6 since FY2020.
48	Horizon Environment Services Limited Top agencies USAF (Department of the Air Force)	$159,905	0.4%	Rank history: #56 in FY2022, #51 in FY2023, not on the FY2024 list and #54 in FY2025; up 3 since FY2020.
49	Best Pest Control of Manhattan, LLC Top agencies Army (Department of the Army)	$154,088	0.4%	Rank history: #55 in FY2022, #50 in FY2023, #44 in FY2024 and #40 in FY2025; down 5 since FY2020.
50	Veterans First Supply Inc. Top agencies VA (Department of Veterans Affairs)	$145,313	0.4%	Rank history: #44 in FY2022, #60 in FY2023, #56 in FY2024 and #77 in FY2025; up 28 since FY2020.
51	Bayou Mosquito & Pest Management LLC Top agencies Army (Department of the Army)	$134,285	0.3%	Rank history: #61 in FY2022, #58 in FY2023, #61 in FY2024 and #61 in FY2025; new, not ranked in FY2020.
52	Pullig Contracting Co Top agencies Army (Department of the Army)	$129,954	0.3%	Rank history: #72 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
53	Razor Consulting Solutions, Inc. Top agencies DHS (Department of Homeland Security)	$129,825	0.3%	Rank history: #62 in FY2022, #57 in FY2023, #54 in FY2024 and #52 in FY2025; up 9 since FY2020.
54	Orkin LLC Top agencies Commerce (Department of Commerce) Army (Department of the Army) USAF (Department of the Air Force)	$122,679	0.3%	Rank history: #67 in FY2022 and not on the FY2023–FY2025 lists; up 39 since FY2020.
55	County of Brunswick Top agencies Army (Department of the Army)	$120,000	0.3%	Rank history: #64 in FY2022, #81 in FY2023, #74 in FY2024 and #72 in FY2025; new, not ranked in FY2020.
56	City of Ozark Top agencies Army (Department of the Army)	$117,732	0.3%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
57	Hamhed LLC Top agencies VA (Department of Veterans Affairs)	$112,074	0.3%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; down 7 since FY2020.
58	Innovative Pest Management, LLC Top agencies USDA (Department of Agriculture) Navy (Department of the Navy) Treasury (Department of the Treasury)	$109,079	0.3%	Rank history: #69 in FY2022, #83 in FY2023 and not on the FY2024–FY2025 lists; up 27 since FY2020.
59	University Termite & Pest Control Inc. Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security) DOI (Department of the Interior)	$88,900	0.2%	Rank history: #75 in FY2022, #71 in FY2023, #70 in FY2024 and not on the FY2025 list; up 15 since FY2020.
60	Veterans Therapeutic Support Services Top agencies Army (Department of the Army)	$88,442	0.2%	Rank history: #22 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
61	Animal Pros, LLC Top agencies Army (Department of the Army)	$87,670	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
62	Central Minority Maintenance, LLC Top agencies Army (Department of the Army)	$87,564	0.2%	Rank history: not on the FY2022–FY2025 lists; up 9 since FY2020.
63	United Bird & Bat Control LLC Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) DOI (Department of the Interior)	$87,523	0.2%	Rank history: not on the FY2022–FY2025 lists; up 107 since FY2020.
64	Aaris LLC Top agencies USDA (Department of Agriculture)	$86,705	0.2%	Rank history: #43 in FY2022, #56 in FY2023, #27 in FY2024 and #74 in FY2025; down 8 since FY2020.
65	Geese Police Inc. 2 awardees, including Double D Goose Control LLC Top agencies DOI (Department of the Interior)	$79,275	0.2%	Rank history: #73 in FY2022, #67 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
66	Kbjvufs LLC Top agencies VA (Department of Veterans Affairs)	$79,186	0.2%	Rank history: #81 in FY2022, #82 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2020.
67	Highlands Environmental Solutions, Inc. Top agencies Army (Department of the Army)	$78,760	0.2%	Rank history: #38 in FY2022, #49 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
68	Preventix Pest Control LLC Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior)	$78,075	0.2%	Rank history: not on the FY2022–FY2025 lists; up 48 since FY2020.
69	Titan Associates Group Inc. Top agencies Army (Department of the Army)	$76,400	0.2%	Rank history: #6 in FY2022, #3 in FY2023, #1 in FY2024 and #16 in FY2025; down 52 since FY2020.
70	Mountain Home Services Top agencies Army (Department of the Army)	$74,000	0.2%	Rank history: #94 in FY2022, #55 in FY2023, #52 in FY2024 and #49 in FY2025; up 21 since FY2020.
71	Midstates Environmental Services LLC Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$72,948	0.2%	Rank history: not on the FY2022–FY2025 lists; up 38 since FY2020.
72	Applied Design Corporation Top agencies USDA (Department of Agriculture)	$72,479	0.2%	Rank history: #36 in FY2022, not on the FY2023 list, #16 in FY2024 and not on the FY2025 list; down 17 since FY2020.
73	Varmint Gone LLC Top agencies DOI (Department of the Interior)	$72,468	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	Tommarktony 3 Services, L.L.C. Top agencies VA (Department of Veterans Affairs)	$72,384	0.2%	Rank history: #85 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; up 12 since FY2020.
75	Frontier Pest Control Inc. Top agencies DHS (Department of Homeland Security)	$72,300	0.2%	Rank history: #88 in FY2022, #91 in FY2023, #96 in FY2024 and not on the FY2025 list; up 9 since FY2020.
76	Gibson Rebecca Top agencies VA (Department of Veterans Affairs)	$72,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
77	Devine Professional Consulting Group Limited Liability Company Top agencies USAF (Department of the Air Force)	$71,820	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Boars No More LLC Top agencies USAF (Department of the Air Force)	$71,737	0.2%	Rank history: not on the FY2022–FY2025 lists; up 4 since FY2020.
79	General Environmental Services Inc. Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$71,583	0.2%	Rank history: #100 in FY2022, #95 in FY2023 and not on the FY2024–FY2025 lists; down 11 since FY2020.
80	Allchemax LLC Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$71,120	0.2%	Rank history: not on the FY2022–FY2025 lists; up 18 since FY2020.
81	Bug Masters LLC Top agencies USDA (Department of Agriculture)	$70,792	0.2%	Rank history: not on the FY2022–FY2025 lists; up 31 since FY2020.
82	Loomacres Inc. Top agencies Navy (Department of the Navy)	$70,578	0.2%	Rank history: not on the FY2022 list, #93 in FY2023, #88 in FY2024 and #94 in FY2025; down 5 since FY2020.
83	Dowell Pest Control LLC Top agencies Army (Department of the Army)	$70,185	0.2%	Rank history: #83 in FY2022, #40 in FY2023, #53 in FY2024 and #84 in FY2025; unchanged since FY2020.
84	Kcsr Inc. Top agencies HHS (Department of Health and Human Services)	$69,248	0.2%	Rank history: #59 in FY2022, #43 in FY2023, #67 in FY2024 and #89 in FY2025; down 4 since FY2020.
85	Cragoe Pest Services, Inc. Top agencies USAF (Department of the Air Force)	$68,042	0.2%	Rank history: #86 in FY2022, #98 in FY2023, #89 in FY2024 and not on the FY2025 list; down 20 since FY2020.
86	Lawn Beautician, Inc. Top agencies DLA (Defense Logistics Agency)	$66,840	0.2%	Rank history: #91 in FY2022, #89 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
87	FAST Action Pest Control Corp Top agencies Army (Department of the Army)	$66,306	0.2%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
88	Rech Baugesellschaft MBH Top agencies Army (Department of the Army)	$64,769	0.2%	Rank history: #87 in FY2022, #90 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
89	Pest End, Inc. Top agencies VA (Department of Veterans Affairs) DOT (Department of Transportation)	$64,395	0.2%	Rank history: #79 in FY2022, #80 in FY2023, not on the FY2024 list and #83 in FY2025; up 102 since FY2020.
90	Apex Pest Control, Inc. Top agencies Army (Department of the Army)	$63,890	0.2%	Rank history: #97 in FY2022, #97 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
91	Mellor Contracting & Supply, LLC Top agencies DHS (Department of Homeland Security)	$62,152	0.2%	Rank history: not on the FY2022–FY2025 lists; up 67 since FY2020.
92	Mccall Service NW, LLC Top agencies Army (Department of the Army)	$61,763	0.1%	Rank history: not on the FY2022–FY2024 lists and #44 in FY2025; up 52 since FY2020.
93	Alleymor, Inc. Top agencies VA (Department of Veterans Affairs)	$60,638	0.1%	Rank history: not on the FY2022 list, #65 in FY2023, #62 in FY2024 and #62 in FY2025; new, not ranked in FY2020.
94	J G M Property Group, Inc. Top agencies VA (Department of Veterans Affairs)	$60,294	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	Veterans Elite Inc. Top agencies USAF (Department of the Air Force)	$59,700	0.1%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
96	National Pest Management Association, Inc. Top agencies VA (Department of Veterans Affairs)	$59,568	0.1%	Rank history: #80 in FY2022, #79 in FY2023, #79 in FY2024 and not on the FY2025 list; up 5 since FY2020.
97	Kurts Complete Pest Control Inc. Top agencies USAF (Department of the Air Force)	$58,000	0.1%	Rank history: #71 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
98	Lotususa, Inc. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$57,674	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Wings Over Colorado LLC Top agencies GSA (General Services Administration)	$56,990	0.1%	Rank history: not on the FY2022–FY2024 lists and #91 in FY2025; up 14 since FY2020.
100	AMG Company, Inc. Top agencies DOI (Department of the Interior)	$55,269	0.1%	Rank history: not on the FY2022 list, #92 in FY2023, not on the FY2024 list and #66 in FY2025; up 5 since FY2020.

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100 of 305 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 56171

Code	Net obligations	Largest contractor
561710 Exterminating and Pest Control Services	$37,429,262	Accord Federal Services, LLC

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 $41.2 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 56171 contractors in FY2021?

1. Accord Federal Services, LLC ($3.65M), 2. Pestmaster Services, L.P. ($3.19M), 3. CDS Services Inc. ($2.65M), 4. American Pest Management Inc. ($2.1M), 5. Alexandria Pest Services, Inc. ($2M), 6. Worrell Contracting Co Inc. ($1.31M), 7. Rollins, Inc. ($1.24M), 8. Cuebid Technologies Inc. ($1.21M), 9. Galaide Professional Services Inc. ($890K), 10. AMD CM LLC ($799K).

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