Large Group Insurance Market Competition | KFF State Health Facts

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Large Group Insurance Market Competition

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Large Group Insurance Market Competition

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2024

Location	Herfindahl-Hirschman Index (HHI)	Market Share of Largest Insurer	Number of Insurers with Greater than 5% Market Share
United States	5061	0.64	3
Alabama	9002	0.95	1
Alaska	8789	0.94	1
Arizona	4207	0.6	4
Arkansas	5051	0.69	5
California	3353	0.55	4
Colorado	4283	0.61	3
Connecticut	2400	0.29	5
Delaware	6327	0.78	3
District of Columbia	2327	0.32	5
Florida	3167	0.46	4
Georgia	2773	0.43	5
Hawaii	4775	0.64	3
Idaho	3589	0.48	4
Illinois	6196	0.77	3
Indiana	5353	0.71	2
Iowa	7369	0.85	2
Kansas	3956	0.53	3
Kentucky	6738	0.81	2
Louisiana	6248	0.76	2
Maine	5122	0.7	3
Maryland	4112	0.58	4
Massachusetts	4872	0.68	4
Michigan	5191	0.69	3
Minnesota	4218	0.57	3
Mississippi	7253	0.84	2
Missouri	2504	0.32	4
Montana	8174	0.9	2
Nebraska	6547	0.8	3
Nevada	6780	0.82	3
New Hampshire	4678	0.65	3
New Jersey	4041	0.6	4
New Mexico	6113	0.76	3
New York	1216	0.18	7
North Carolina	7338	0.85	2
North Dakota	4693	0.5	2
Ohio	4201	0.61	4
Oklahoma	6361	0.79	3
Oregon	2863	0.45	5
Pennsylvania	2816	0.46	4
Rhode Island	7199	0.84	2
South Carolina	7888	0.89	2
South Dakota	6159	0.77	3
Tennessee	5333	0.71	3
Texas	4341	0.59	3
Utah	3137	0.45	4
Vermont	6840	0.82	3
Virginia	2660	0.46	5
Washington	2697	0.35	4
West Virginia	6937	0.82	2
Wisconsin	1618	0.24	5
Wyoming	8299	0.91	1

2023

Location	Herfindahl-Hirschman Index (HHI)	Market Share of Largest Insurer	Number of Insurers with Greater than 5% Market Share
United States	4987	0.64	3
Alabama	8918	0.94	1
Alaska	8782	0.94	1
Arizona	4045	0.58	4
Arkansas	5056	0.69	5
California	3355	0.54	4
Colorado	4548	0.64	3
Connecticut	2367	0.31	5
Delaware	6793	0.82	3
District of Columbia	2337	0.33	5
Florida	2993	0.45	4
Georgia	2585	0.41	5
Hawaii	4832	0.65	3
Idaho	4482	0.63	3
Illinois	6045	0.76	3
Indiana	4973	0.68	2
Iowa	6956	0.83	2
Kansas	3727	0.51	4
Kentucky	5375	0.7	3
Louisiana	5927	0.75	2
Maine	5153	0.7	3
Maryland	3952	0.56	4
Massachusetts	4554	0.64	3
Michigan	4967	0.67	3
Minnesota	6820	0.81	2
Mississippi	6773	0.81	2
Missouri	2466	0.3	4
Montana	7658	0.87	2
Nebraska	7390	0.85	2
Nevada	6625	0.81	3
New Hampshire	4509	0.63	4
New Jersey	3761	0.57	4
New Mexico	5738	0.73	3
New York	1218	0.17	7
North Carolina	6853	0.82	2
North Dakota	4861	0.5	2
Ohio	3087	0.49	5
Oklahoma	6220	0.78	3
Oregon	2916	0.46	5
Pennsylvania	2694	0.44	5
Rhode Island	6968	0.83	3
South Carolina	7871	0.88	2
South Dakota	5842	0.74	3
Tennessee	5033	0.68	3
Texas	4038	0.56	4
Utah	3183	0.46	4
Vermont	6998	0.83	3
Virginia	2674	0.46	5
Washington	2692	0.35	4
West Virginia	6818	0.81	2
Wisconsin	1497	0.23	5
Wyoming	8390	0.91	1

2022

Location	Herfindahl-Hirschman Index (HHI)	Market Share of Largest Insurer	Number of Insurers with Greater than 5% Market Share
United States	4879	0.63	3
Alabama	8858	0.94	1
Alaska	9092	0.95	1
Arizona	4012	0.58	4
Arkansas	5152	0.7	3
California	3393	0.55	4
Colorado	4315	0.62	3
Connecticut	2316	0.31	5
Delaware	6884	0.82	3
District of Columbia	2380	0.34	5
Florida	2969	0.44	4
Georgia	2695	0.43	5
Hawaii	4892	0.65	3
Idaho	5079	0.68	3
Illinois	5775	0.74	3
Indiana	3370	0.54	5
Iowa	6778	0.82	2
Kansas	3775	0.5	4
Kentucky	5463	0.71	3
Louisiana	5466	0.71	3
Maine	5527	0.73	3
Maryland	3937	0.56	4
Massachusetts	4389	0.63	3
Michigan	4963	0.67	3
Minnesota	6999	0.83	2
Mississippi	7054	0.83	2
Missouri	2482	0.3	4
Montana	7413	0.86	2
Nebraska	7447	0.85	2
Nevada	5835	0.75	4
New Hampshire	4415	0.61	4
New Jersey	3134	0.49	4
New Mexico	5179	0.7	4
New York	1219	0.17	7
North Carolina	6006	0.76	2
North Dakota	4701	0.51	2
Ohio	3201	0.52	6
Oklahoma	5924	0.76	3
Oregon	2885	0.46	5
Pennsylvania	2595	0.43	5
Rhode Island	6999	0.83	3
South Carolina	8501	0.92	1
South Dakota	5139	0.68	3
Tennessee	4396	0.62	4
Texas	3687	0.51	4
Utah	3263	0.48	4
Vermont	6901	0.82	3
Virginia	2705	0.46	6
Washington	2788	0.35	4
West Virginia	6799	0.81	2
Wisconsin	1334	0.21	6
Wyoming	8370	0.91	1

2021

Location	Herfindahl-Hirschman Index (HHI)	Market Share of Largest Insurer	Number of Insurers with Greater than 5% Market Share
United States	4904	0.63	3
Alabama	9070	0.95	1
Alaska	9276	0.96	1
Arizona	3921	0.57	4
Arkansas	5099	0.69	3
California	3277	0.53	4
Colorado	4371	0.63	3
Connecticut	2332	0.33	5
Delaware	6309	0.78	3
District of Columbia	2457	0.36	5
Florida	3027	0.46	4
Georgia	2730	0.44	6
Hawaii	4981	0.66	3
Idaho	5224	0.7	4
Illinois	5835	0.75	3
Indiana	5082	0.69	3
Iowa	6539	0.8	2
Kansas	3774	0.49	3
Kentucky	5218	0.68	3
Louisiana	5314	0.7	3
Maine	5547	0.73	3
Maryland	3853	0.55	4
Massachusetts	4398	0.62	2
Michigan	4843	0.66	3
Minnesota	7971	0.89	2
Mississippi	7364	0.85	2
Missouri	2605	0.34	3
Montana	7213	0.84	2
Nebraska	7128	0.84	3
Nevada	6155	0.78	4
New Hampshire	4341	0.6	4
New Jersey	3259	0.51	4
New Mexico	5043	0.69	4
New York	1194	0.15	7
North Carolina	5910	0.75	2
North Dakota	4835	0.51	2
Ohio	3300	0.53	6
Oklahoma	5578	0.73	4
Oregon	2860	0.46	5
Pennsylvania	2424	0.41	5
Rhode Island	6773	0.81	3
South Carolina	8404	0.91	1
South Dakota	5055	0.67	3
Tennessee	4825	0.67	4
Texas	3719	0.52	3
Utah	3153	0.45	4
Vermont	6408	0.78	3
Virginia	2671	0.46	5
Washington	2815	0.38	3
West Virginia	6802	0.81	2
Wisconsin	1353	0.21	6
Wyoming	8460	0.92	1

2020

Location	Herfindahl-Hirschman Index (HHI)	Market Share of Largest Insurer	Number of Insurers with Greater than 5% Market Share
United States	4814	0.62	3
Alabama	9073	0.95	1
Alaska	9239	0.96	1
Arizona	3968	0.57	4
Arkansas	4498	0.63	4
California	3411	0.55	4
Colorado	4406	0.64	3
Connecticut	2298	0.31	5
Delaware	5724	0.74	3
District of Columbia	2488	0.37	5
Florida	3009	0.46	5
Georgia	2648	0.43	6
Hawaii	4999	0.66	3
Idaho	5320	0.7	3
Illinois	5796	0.74	3
Indiana	3719	0.57	4
Iowa	6362	0.79	2
Kansas	3753	0.49	3
Kentucky	5232	0.68	3
Louisiana	5306	0.7	3
Maine	5596	0.73	3
Maryland	3799	0.55	4
Massachusetts	4194	0.63	3
Michigan	4885	0.67	3
Minnesota	7602	0.87	2
Mississippi	7159	0.84	2
Missouri	2587	0.33	3
Montana	7130	0.84	2
Nebraska	6704	0.81	3
Nevada	6328	0.79	4
New Hampshire	4285	0.59	3
New Jersey	3353	0.52	4
New Mexico	5173	0.7	4
New York	1173	0.15	7
North Carolina	5695	0.73	2
North Dakota	4869	0.5	2
Ohio	3337	0.54	6
Oklahoma	5154	0.7	4
Oregon	2842	0.46	5
Pennsylvania	2363	0.4	5
Rhode Island	6546	0.79	3
South Carolina	8477	0.92	1
South Dakota	4973	0.67	3
Tennessee	5117	0.69	4
Texas	3567	0.51	3
Utah	3075	0.44	4
Vermont	6652	0.8	3
Virginia	2555	0.44	5
Washington	2808	0.38	4
West Virginia	6520	0.79	2
Wisconsin	1336	0.21	6
Wyoming	8400	0.92	1

2019

Location	Herfindahl-Hirschman Index (HHI)	Market Share of Largest Insurer	Number of Insurers with Greater than 5% Market Share
United States	4626	0.6	3
Alabama	8963	0.95	1
Alaska	8965	0.95	1
Arizona	3758	0.54	4
Arkansas	5170	0.69	3
California	3225	0.53	4
Colorado	3199	0.49	4
Connecticut	2161	0.28	5
Delaware	5729	0.74	3
District of Columbia	2597	0.4	5
Florida	3028	0.46	4
Georgia	2486	0.41	6
Hawaii	4961	0.66	3
Idaho	5365	0.71	3
Illinois	5627	0.73	3
Indiana	4938	0.67	2
Iowa	6255	0.78	2
Kansas	3792	0.49	3
Kentucky	5239	0.68	3
Louisiana	5224	0.69	3
Maine	5212	0.69	3
Maryland	3847	0.55	4
Massachusetts	4148	0.62	3
Michigan	4759	0.66	3
Minnesota	3464	0.47	3
Mississippi	7111	0.83	2
Missouri	2667	0.36	4
Montana	7200	0.84	3
Nebraska	6214	0.77	3
Nevada	4647	0.65	3
New Hampshire	4125	0.56	3
New Jersey	3319	0.52	4
New Mexico	4460	0.62	4
New York	1182	0.16	7
North Carolina	5371	0.7	3
North Dakota	4609	0.51	2
Ohio	2938	0.46	3
Oklahoma	4444	0.64	4
Oregon	2726	0.45	5
Pennsylvania	2281	0.39	6
Rhode Island	6454	0.79	3
South Carolina	8365	0.91	1
South Dakota	4780	0.65	3
Tennessee	5464	0.72	3
Texas	3354	0.46	3
Utah	2932	0.43	4
Vermont	8315	0.91	2
Virginia	2392	0.42	6
Washington	2491	0.34	5
West Virginia	6384	0.78	2
Wisconsin	1256	0.2	7
Wyoming	8310	0.91	1

2018

Location	Herfindahl-Hirschman Index (HHI)	Market Share of Largest Insurer	Number of Insurers with Greater than 5% Market Share
United States	4510	0.59	3
Alabama	8874	0.94	1
Alaska	8613	0.93	2
Arizona	3354	0.5	4
Arkansas	5967	0.76	3
California	3150	0.52	4
Colorado	3129	0.48	4
Connecticut	2075	0.27	5
Delaware	5141	0.69	3
District of Columbia	2709	0.42	5
Florida	3088	0.47	4
Georgia	2300	0.37	6
Hawaii	5030	0.67	3
Idaho	5098	0.68	2
Illinois	5318	0.71	3
Indiana	4839	0.66	2
Iowa	6450	0.79	2
Kansas	3579	0.47	4
Kentucky	5076	0.67	3
Louisiana	4766	0.66	3
Maine	5181	0.69	3
Maryland	3854	0.55	4
Massachusetts	3959	0.6	3
Michigan	4613	0.65	3
Minnesota	3631	0.49	3
Mississippi	7292	0.84	2
Missouri	2613	0.36	4
Montana	6898	0.82	3
Nebraska	5819	0.74	3
Nevada	4828	0.66	3
New Hampshire	4163	0.56	3
New Jersey	3502	0.54	4
New Mexico	3979	0.55	4
New York	1182	0.16	7
North Carolina	4964	0.66	3
North Dakota	4659	0.51	2
Ohio	2685	0.42	4
Oklahoma	3485	0.54	5
Oregon	2610	0.44	5
Pennsylvania	2280	0.4	6
Rhode Island	6263	0.77	3
South Carolina	8357	0.91	1
South Dakota	4759	0.65	3
Tennessee	5419	0.72	3
Texas	3108	0.43	3
Utah	2828	0.42	4
Vermont	8266	0.91	2
Virginia	2372	0.42	6
Washington	2475	0.34	5
West Virginia	6698	0.8	2
Wisconsin	1250	0.21	7
Wyoming	7485	0.86	2

2017

Location	Herfindahl-Hirschman Index (HHI)	Market Share of Largest Insurer	Number of Insurers with Greater than 5% Market Share
United States	4367	0.58	4
Alabama	8744	0.93	1
Alaska	7791	0.88	2
Arizona	3217	0.4	4
Arkansas	6263	0.78	3
California	3031	0.51	4
Colorado	3214	0.48	4
Connecticut	2138	0.29	5
Delaware	4433	0.62	4
District of Columbia	2893	0.44	5
Florida	3079	0.46	4
Georgia	2504	0.41	6
Hawaii	5103	0.67	2
Idaho	5044	0.67	2
Illinois	4861	0.67	3
Indiana	4616	0.62	2
Iowa	6332	0.78	2
Kansas	3456	0.46	4
Kentucky	4720	0.65	4
Louisiana	4524	0.64	3
Maine	5089	0.68	3
Maryland	3846	0.55	3
Massachusetts	3743	0.58	3
Michigan	4327	0.62	3
Minnesota	3506	0.46	3
Mississippi	7062	0.83	2
Missouri	2652	0.36	4
Montana	6713	0.81	3
Nebraska	5873	0.74	3
Nevada	4676	0.65	3
New Hampshire	4280	0.56	3
New Jersey	3562	0.54	4
New Mexico	3999	0.55	3
New York	1172	0.16	8
North Carolina	4681	0.63	3
North Dakota	4579	0.49	2
Ohio	2781	0.44	4
Oklahoma	3212	0.51	5
Oregon	2541	0.42	4
Pennsylvania	2058	0.35	6
Rhode Island	6373	0.78	3
South Carolina	7786	0.88	2
South Dakota	4391	0.62	3
Tennessee	5261	0.71	3
Texas	2994	0.42	3
Utah	2781	0.4	4
Vermont	8519	0.92	2
Virginia	2546	0.44	7
Washington	2626	0.34	5
West Virginia	6371	0.78	2
Wisconsin	1253	0.19	8
Wyoming	5506	0.71	2

2016

Location	Herfindahl-Hirschman Index (HHI)	Market Share of Largest Insurer	Number of Insurers with Greater than 5% Market Share
United States	4438	0.59	4
Alabama	8654	0.93	1
Alaska	7177	0.84	2
Arizona	2996	0.38	5
Arkansas	6436	0.79	3
California	2855	0.49	4
Colorado	3182	0.49	4
Connecticut	2049	0.3	5
Delaware	5256	0.7	3
District of Columbia	2574	0.37	5
Florida	3247	0.49	3
Georgia	2704	0.44	6
Hawaii	5272	0.69	3
Idaho	4971	0.66	2
Illinois	4982	0.68	3
Indiana	4476	0.62	2
Iowa	6282	0.78	2
Kansas	3732	0.52	3
Kentucky	4950	0.68	4
Louisiana	4629	0.65	4
Maine	5321	0.7	3
Maryland	4658	0.65	3
Massachusetts	3758	0.58	4
Michigan	4352	0.62	3
Minnesota	3473	0.46	3
Mississippi	7071	0.83	2
Missouri	2393	0.29	4
Montana	7074	0.83	3
Nebraska	6292	0.78	3
Nevada	4697	0.65	3
New Hampshire	4512	0.57	3
New Jersey	3546	0.54	5
New Mexico	4512	0.62	3
New York	1203	0.17	8
North Carolina	5205	0.69	3
North Dakota	4692	0.5	2
Ohio	2717	0.44	4
Oklahoma	3334	0.52	5
Oregon	2553	0.42	5
Pennsylvania	2110	0.35	6
Rhode Island	6330	0.78	3
South Carolina	7937	0.89	2
South Dakota	3857	0.55	3
Tennessee	5465	0.73	4
Texas	3058	0.46	4
Utah	2884	0.42	4
Vermont	7942	0.89	2
Virginia	2875	0.48	6
Washington	2848	0.37	3
West Virginia	6380	0.78	2
Wisconsin	1050	0.15	8
Wyoming	5833	0.74	3

2015

Location	Herfindahl-Hirschman Index (HHI)	Market Share of Largest Insurer	Number of Insurers with Greater than 5% Market Share
United States	4539	0.6	4
Alabama	8780	0.94	1
Alaska	7213	0.84	2
Arizona	2808	0.39	5
Arkansas	6766	0.81	2
California	2731	0.47	4
Colorado	2999	0.46	4
Connecticut	2100	0.32	5
Delaware	4972	0.67	3
District of Columbia	2689	0.4	4
Florida	3500	0.53	4
Georgia	2888	0.46	5
Hawaii	5347	0.7	2
Idaho	5255	0.68	2
Illinois	5069	0.68	3
Indiana	4266	0.61	3
Iowa	6216	0.77	3
Kansas	3844	0.57	4
Kentucky	5294	0.71	4
Louisiana	4467	0.64	4
Maine	5280	0.7	3
Maryland	4734	0.66	4
Massachusetts	3737	0.58	5
Michigan	4201	0.62	3
Minnesota	3530	0.49	3
Mississippi	7080	0.83	2
Missouri	2401	0.32	4
Montana	7001	0.83	3
Nebraska	6558	0.8	3
Nevada	4792	0.67	3
New Hampshire	4602	0.57	3
New Jersey	3764	0.57	5
New Mexico	4634	0.61	3
New York	1221	0.18	8
North Carolina	5579	0.72	3
North Dakota	5925	0.73	2
Ohio	2584	0.43	4
Oklahoma	3464	0.54	5
Oregon	2613	0.42	4
Pennsylvania	2207	0.36	6
Rhode Island	6300	0.78	3
South Carolina	8364	0.91	2
South Dakota	4045	0.58	4
Tennessee	6299	0.78	3
Texas	3291	0.49	3
Utah	3075	0.43	4
Vermont	7343	0.85	2
Virginia	4055	0.61	5
Washington	2767	0.36	3
West Virginia	6350	0.78	2
Wisconsin	974	0.15	9
Wyoming	5495	0.73	3

2014

Location	Herfindahl-Hirschman Index (HHI)	Market Share of Largest Insurer	Number of Insurers with Greater than 5% Market Share
United States	4539	0.6	4
Alabama	8597	0.93	1
Alaska	7462	0.86	2
Arizona	2673	0.38	5
Arkansas	6565	0.8	3
California	2639	0.45	5
Colorado	3051	0.47	4
Connecticut	2272	0.33	5
Delaware	5485	0.71	2
District of Columbia	2701	0.4	4
Florida	3552	0.54	5
Georgia	2707	0.44	5
Hawaii	5316	0.69	2
Idaho	5323	0.69	2
Illinois	5212	0.7	3
Indiana	4071	0.6	3
Iowa	6159	0.77	3
Kansas	3629	0.55	4
Kentucky	5094	0.69	4
Louisiana	4272	0.62	4
Maine	5501	0.72	3
Maryland	4840	0.67	4
Massachusetts	3690	0.57	5
Michigan	4010	0.6	3
Minnesota	3419	0.47	3
Mississippi	6769	0.8	2
Missouri	2369	0.33	4
Montana	7051	0.83	2
Nebraska	6374	0.79	3
Nevada	4740	0.66	4
New Hampshire	4308	0.56	3
New Jersey	3556	0.55	5
New Mexico	4926	0.63	3
New York	1460	0.27	7
North Carolina	5843	0.75	3
North Dakota	9154	0.96	1
Ohio	2523	0.43	4
Oklahoma	3507	0.54	5
Oregon	2619	0.42	4
Pennsylvania	2115	0.34	5
Rhode Island	6108	0.76	3
South Carolina	8473	0.92	1
South Dakota	4116	0.59	4
Tennessee	6260	0.78	2
Texas	3244	0.49	3
Utah	3008	0.43	4
Vermont	6699	0.8	3
Virginia	2801	0.47	6
Washington	2674	0.33	3
West Virginia	6206	0.77	3
Wisconsin	1035	0.14	8
Wyoming	5313	0.71	4

2013

Location	Herfindahl-Hirschman Index (HHI)	Market Share of Largest Insurer	Number of Insurers with Greater than 5% Market Share
United States	4509	0.59	4
Alabama	8394	0.91	1
Alaska	7424	0.85	2
Arizona	2512	0.33	5
Arkansas	6215	0.77	3
California	3497	0.54	4
Colorado	3025	0.47	4
Connecticut	2270	0.34	5
Delaware	4310	0.51	3
District of Columbia	2501	0.34	4
Florida	3408	0.53	5
Georgia	2612	0.43	5
Hawaii	6103	0.75	2
Idaho	5195	0.67	2
Illinois	5616	0.74	3
Indiana	4242	0.62	3
Iowa	6019	0.76	3
Kansas	3138	0.46	4
Kentucky	4724	0.66	4
Louisiana	4396	0.63	4
Maine	5604	0.73	4
Maryland	4846	0.67	4
Massachusetts	3582	0.56	4
Michigan	3868	0.58	3
Minnesota	3333	0.45	3
Mississippi	7086	0.83	2
Missouri	2446	0.36	4
Montana	6732	0.80	2
Nebraska	6925	0.82	3
Nevada	4674	0.66	3
New Hampshire	4197	0.57	3
New Jersey	3763	0.57	5
New Mexico	3158	0.40	4
New York	1670	0.22	4
North Carolina	5755	0.74	3
North Dakota	9386	0.97	1
Ohio	2451	0.40	3
Oklahoma	3479	0.54	5
Oregon	2570	0.41	4
Pennsylvania	2183	0.36	6
Rhode Island	6019	0.76	2
South Carolina	8304	0.91	1
South Dakota	4184	0.60	4
Tennessee	5969	0.76	3
Texas	2981	0.46	5
Utah	3082	0.45	4
Vermont	6533	0.79	3
Virginia	2567	0.44	6
Washington	2767	0.33	3
West Virginia	7235	0.84	3
Wisconsin	925	0.14	9
Wyoming	6,096	0.77	3

Topics

State Health Policy and Data

Categories

Insurance Market Competitiveness