SIC 8071 Services-Medical Laboratories

Quest Diagnostics Incorporated vs Labcorp Holdings Inc.

Measured twinDGX / LHPrices through Oct 22, 2026

Why these are rivals: #2 and #3 by market value ($26B vs $26B) with SEC SIC 8071 (Services-Medical Laboratories).

The price gap between these two has a measured habit of closing. A 2 standard deviation gap becomes a paired paper idea.

no divergence: z = 0.33 (needs |z| >= 2.0)

Business leadership

LH is the larger business

Annual revenue reported to the SEC. Scale, not market share.

Year	DGX	LH	Larger
2025	$11.0B	$14.0B	LH
2024	$9.9B	$13.0B	LH
2023	$9.3B	$12.2B	LH
2022	$9.9B	$11.9B	LH
2021	$10.8B	$13.1B	LH
2020	$9.4B	$14.0B	LH

LH led in every year with figures for both. Market value: DGX $25.9B, LH $25.9B.

Stock leadership

DGX is ahead now

Measured against the pair's own last 252 trading days.

DGX leads LH by 0.33 standard deviations: +1.3% over its usual price ratio. 1 lead switch in the last year.

Price change	3 mo	6 mo	12 mo
DGX	+6.8%	+21.9%	+31.8%
LH	+11.2%	+24.5%	+16.1%

Relationship

The gap has closed before

Only these tests can make a pair tradable on paper.

Pass: Aligned sessions: 2521 (needs >= 254)
Pass: Co-movement: daily return correlation, 252 sessions: 0.74 (needs >= 0.60)
Pass: Mean reversion: ADF t-statistic of the spread: -3.58 (needs <= -2.873 (5% critical value))
Pass: Speed: half-life of the spread, sessions: 11.41 (needs <= 63)
Data: Both stocks current

The twins over two years

Prices side by side, and the gap between them

DGX Quest Diagnostics Incorporated LH Labcorp Holdings Inc.Price index, 100 = 2024-10-18. Tint = which stock is ahead of the pair's usual 1-year relationship (z beyond +/-0.5).

Spread z-score: DGX relative to LH, against the 252 sessions before each day. Above 0: DGX ahead; below 0: LH ahead. Lines at +/-2 (idea) and +/-4 (stop).

Data table (504 sessions)

Date	DGX index	LH index	z	Ahead
2026-10-22	162.57	152.91	+0.33	near the usual relationship
2026-10-21	159.66	150.04	+0.36	near the usual relationship
2026-10-20	158.45	149.76	+0.22	near the usual relationship
2026-10-19	156.97	147.76	+0.33	near the usual relationship
2026-10-16	157.03	147.36	+0.42	near the usual relationship
2026-10-15	159.81	150.66	+0.31	near the usual relationship
2026-10-14	155.98	147.07	+0.31	near the usual relationship
2026-10-13	154.00	145.36	+0.29	near the usual relationship
2026-10-12	155.45	146.23	+0.38	near the usual relationship
2026-10-09	154.34	144.67	+0.48	near the usual relationship
2026-10-08	154.23	145.62	+0.31	near the usual relationship
2026-10-07	151.73	144.58	+0.10	near the usual relationship
2026-10-06	152.62	144.46	+0.27	near the usual relationship
2026-10-05	155.18	143.05	+0.87	DGX ahead
2026-10-02	155.92	142.97	+1.00	DGX ahead
2026-10-01	154.42	141.17	+1.07	DGX ahead
2026-09-30	155.74	142.80	+1.01	DGX ahead
2026-09-29	155.01	143.12	+0.86	DGX ahead
2026-09-28	158.78	143.47	+1.35	DGX ahead
2026-09-25	157.92	143.50	+1.23	DGX ahead
2026-09-24	158.10	143.18	+1.32	DGX ahead
2026-09-23	155.70	140.88	+1.35	DGX ahead
2026-09-22	156.87	144.39	+0.98	DGX ahead
2026-09-21	163.64	148.76	+1.26	DGX ahead
2026-09-18	164.68	148.64	+1.42	DGX ahead
2026-09-17	165.35	149.57	+1.38	DGX ahead
2026-09-16	165.11	150.40	+1.24	DGX ahead
2026-09-15	165.11	150.15	+1.28	DGX ahead
2026-09-14	158.96	146.13	+1.06	DGX ahead
2026-09-11	157.05	144.39	+1.06	DGX ahead
2026-09-10	154.45	142.26	+1.03	DGX ahead
2026-09-09	157.34	148.82	+0.48	near the usual relationship
2026-09-08	157.37	150.56	+0.24	near the usual relationship
2026-09-04	158.46	151.50	+0.27	near the usual relationship
2026-09-03	159.97	153.64	+0.18	near the usual relationship
2026-09-02	160.91	153.71	+0.29	near the usual relationship
2026-09-01	157.85	151.83	+0.16	near the usual relationship
2026-08-31	160.57	154.17	+0.20	near the usual relationship
2026-08-28	162.22	155.31	+0.27	near the usual relationship
2026-08-27	163.45	155.97	+0.34	near the usual relationship
2026-08-26	163.72	155.59	+0.43	near the usual relationship
2026-08-25	163.39	156.50	+0.28	near the usual relationship
2026-08-24	162.96	157.27	+0.14	near the usual relationship
2026-08-21	163.31	155.88	+0.36	near the usual relationship
2026-08-20	161.24	154.24	+0.32	near the usual relationship
2026-08-19	161.55	153.14	+0.50	DGX ahead
2026-08-18	157.87	149.32	+0.55	DGX ahead
2026-08-17	157.38	149.85	+0.43	near the usual relationship
2026-08-14	156.63	147.44	+0.66	DGX ahead
2026-08-13	157.73	149.51	+0.53	DGX ahead
2026-08-12	158.88	149.92	+0.62	DGX ahead
2026-08-11	158.70	149.43	+0.67	DGX ahead
2026-08-10	158.79	148.91	+0.75	DGX ahead
2026-08-07	159.27	147.92	+0.94	DGX ahead
2026-08-06	159.37	146.70	+1.12	DGX ahead
2026-08-05	157.59	145.51	+1.07	DGX ahead
2026-08-04	156.18	144.76	+1.00	DGX ahead
2026-08-03	154.99	142.48	+1.16	DGX ahead
2026-07-31	155.70	143.30	+1.15	DGX ahead
2026-07-30	156.57	146.23	+0.88	DGX ahead
2026-07-29	157.18	142.35	+1.46	DGX ahead
2026-07-28	157.66	145.63	+1.10	DGX ahead
2026-07-27	154.92	139.58	+1.57	DGX ahead
2026-07-24	152.26	137.54	+1.54	DGX ahead
2026-07-23	152.29	134.88	+1.92	DGX ahead
2026-07-22	140.21	130.44	+1.02	DGX ahead
2026-07-21	138.22	129.49	+0.90	DGX ahead
2026-07-20	138.76	130.45	+0.84	DGX ahead
2026-07-17	140.78	131.33	+0.99	DGX ahead
2026-07-16	139.93	130.67	+0.98	DGX ahead
2026-07-15	134.83	126.06	+0.96	DGX ahead
2026-07-14	137.65	127.77	+1.11	DGX ahead
2026-07-13	138.56	128.23	+1.17	DGX ahead
2026-07-10	138.62	128.29	+1.18	DGX ahead
2026-07-09	139.02	128.67	+1.19	DGX ahead
2026-07-08	139.13	128.72	+1.21	DGX ahead
2026-07-07	141.92	131.56	+1.18	DGX ahead
2026-07-06	142.63	131.80	+1.25	DGX ahead
2026-07-02	144.15	133.00	+1.29	DGX ahead
2026-07-01	144.35	131.57	+1.53	DGX ahead
2026-06-30	141.63	129.77	+1.44	DGX ahead
2026-06-29	142.09	129.57	+1.55	DGX ahead
2026-06-26	140.25	125.81	+1.88	DGX ahead
2026-06-25	137.81	123.44	+1.94	DGX ahead
2026-06-24	135.72	122.90	+1.74	DGX ahead
2026-06-23	131.76	119.85	+1.67	DGX ahead
2026-06-22	129.36	117.92	+1.65	DGX ahead
2026-06-18	130.30	118.56	+1.70	DGX ahead
2026-06-17	132.15	120.29	+1.71	DGX ahead
2026-06-16	134.34	122.70	+1.66	DGX ahead
2026-06-15	135.10	122.83	+1.77	DGX ahead
2026-06-12	135.69	123.35	+1.79	DGX ahead
2026-06-11	136.20	122.94	+1.96	DGX ahead
2026-06-10	136.17	124.50	+1.71	DGX ahead
2026-06-09	136.67	125.71	+1.61	DGX ahead
2026-06-08	131.78	121.43	+1.58	DGX ahead
2026-06-05	133.84	122.89	+1.67	DGX ahead
2026-06-04	131.05	120.95	+1.58	DGX ahead
2026-06-03	129.42	120.00	+1.50	DGX ahead
2026-06-02	129.07	119.43	+1.55	DGX ahead
2026-06-01	128.43	119.05	+1.53	DGX ahead
2026-05-29	130.24	120.53	+1.58	DGX ahead
2026-05-28	131.11	121.77	+1.51	DGX ahead
2026-05-27	129.63	119.69	+1.65	DGX ahead
2026-05-26	128.89	119.78	+1.53	DGX ahead
2026-05-22	130.44	120.47	+1.68	DGX ahead
2026-05-21	129.52	118.53	+1.89	DGX ahead
2026-05-20	129.47	119.30	+1.75	DGX ahead
2026-05-19	127.22	117.57	+1.70	DGX ahead
2026-05-18	126.86	118.45	+1.49	DGX ahead
2026-05-15	124.70	116.05	+1.57	DGX ahead
2026-05-14	125.59	117.73	+1.42	DGX ahead
2026-05-13	127.53	117.91	+1.74	DGX ahead
2026-05-12	127.08	119.27	+1.41	DGX ahead
2026-05-11	126.84	118.22	+1.58	DGX ahead
2026-05-08	125.22	117.77	+1.38	DGX ahead
2026-05-07	127.52	119.59	+1.45	DGX ahead
2026-05-06	126.38	119.08	+1.35	DGX ahead
2026-05-05	127.52	119.17	+1.55	DGX ahead
2026-05-04	127.97	117.26	+2.01	DGX ahead
2026-05-01	128.75	118.57	+1.90	DGX ahead
2026-04-30	129.77	119.02	+2.00	DGX ahead
2026-04-29	126.51	119.17	+1.37	DGX ahead
2026-04-28	130.34	120.30	+1.83	DGX ahead
2026-04-27	131.39	122.09	+1.67	DGX ahead
2026-04-24	131.15	122.26	+1.58	DGX ahead
2026-04-23	133.33	122.78	+1.83	DGX ahead
2026-04-22	136.32	126.35	+1.68	DGX ahead
2026-04-21	137.01	126.72	+1.73	DGX ahead
2026-04-20	131.18	124.76	+1.10	DGX ahead
2026-04-17	130.32	125.45	+0.83	DGX ahead
2026-04-16	127.94	123.45	+0.77	DGX ahead
2026-04-15	127.91	123.62	+0.73	DGX ahead
2026-04-14	129.74	124.61	+0.86	DGX ahead
2026-04-13	128.91	122.44	+1.11	DGX ahead
2026-04-10	127.97	120.93	+1.22	DGX ahead
2026-04-09	132.19	126.64	+0.92	DGX ahead
2026-04-08	132.85	127.32	+0.91	DGX ahead
2026-04-07	131.51	124.75	+1.14	DGX ahead
2026-04-06	132.95	127.20	+0.95	DGX ahead
2026-04-02	132.32	126.86	+0.90	DGX ahead
2026-04-01	132.10	126.40	+0.95	DGX ahead
2026-03-31	130.96	123.65	+1.24	DGX ahead
2026-03-30	131.75	122.17	+1.65	DGX ahead
2026-03-27	130.64	122.45	+1.42	DGX ahead
2026-03-26	132.41	124.38	+1.38	DGX ahead
2026-03-25	131.28	123.29	+1.39	DGX ahead
2026-03-24	131.03	123.34	+1.35	DGX ahead
2026-03-23	130.70	122.55	+1.45	DGX ahead
2026-03-20	130.48	121.89	+1.54	DGX ahead
2026-03-19	129.74	122.39	+1.32	DGX ahead
2026-03-18	130.46	123.21	+1.30	DGX ahead
2026-03-17	132.72	125.42	+1.29	DGX ahead
2026-03-16	132.94	123.67	+1.66	DGX ahead
2026-03-13	133.44	122.26	+2.03	DGX ahead
2026-03-12	134.23	121.85	+2.28	DGX ahead
2026-03-11	134.02	125.33	+1.60	DGX ahead
2026-03-10	134.25	124.53	+1.80	DGX ahead
2026-03-09	134.70	126.81	+1.47	DGX ahead
2026-03-06	133.12	124.98	+1.55	DGX ahead
2026-03-05	136.30	127.88	+1.58	DGX ahead
2026-03-04	139.29	130.16	+1.69	DGX ahead
2026-03-03	139.23	131.15	+1.51	DGX ahead
2026-03-02	140.49	132.77	+1.45	DGX ahead
2026-02-27	141.60	133.99	+1.43	DGX ahead
2026-02-26	141.06	133.30	+1.47	DGX ahead
2026-02-25	138.86	131.06	+1.51	DGX ahead
2026-02-24	140.02	133.07	+1.36	DGX ahead
2026-02-23	138.61	132.22	+1.27	DGX ahead
2026-02-20	135.26	131.01	+0.90	DGX ahead
2026-02-19	135.28	130.92	+0.93	DGX ahead
2026-02-18	136.58	129.19	+1.51	DGX ahead
2026-02-17	137.31	128.22	+1.84	DGX ahead
2026-02-13	138.24	130.99	+1.49	DGX ahead
2026-02-12	138.23	128.89	+1.92	DGX ahead
2026-02-11	139.87	134.35	+1.18	DGX ahead
2026-02-10	137.22	131.85	+1.18	DGX ahead
2026-02-09	127.80	126.99	+0.34	near the usual relationship
2026-02-06	127.44	128.47	-0.02	near the usual relationship
2026-02-05	128.50	128.95	+0.10	near the usual relationship
2026-02-04	126.45	127.99	-0.11	near the usual relationship
2026-02-03	123.74	126.15	-0.29	near the usual relationship
2026-02-02	123.62	125.27	-0.13	near the usual relationship
2026-01-30	124.98	125.84	+0.03	near the usual relationship
2026-01-29	121.85	125.05	-0.42	near the usual relationship
2026-01-28	122.11	124.22	-0.20	near the usual relationship
2026-01-27	123.11	125.65	-0.27	near the usual relationship
2026-01-26	121.97	123.92	-0.15	near the usual relationship
2026-01-23	120.96	123.59	-0.28	near the usual relationship
2026-01-22	121.72	125.12	-0.41	near the usual relationship
2026-01-21	123.39	124.73	-0.01	near the usual relationship
2026-01-20	126.26	125.74	+0.34	near the usual relationship
2026-01-16	126.62	125.54	+0.45	near the usual relationship
2026-01-15	127.14	124.62	+0.72	DGX ahead
2026-01-14	124.80	121.43	+0.90	DGX ahead
2026-01-13	120.25	117.71	+0.77	DGX ahead
2026-01-12	117.57	116.04	+0.58	DGX ahead
2026-01-09	116.57	116.70	+0.26	near the usual relationship
2026-01-08	118.77	118.03	+0.43	near the usual relationship
2026-01-07	119.04	117.59	+0.57	DGX ahead
2026-01-06	120.59	120.68	+0.28	near the usual relationship
2026-01-05	115.93	117.34	+0.03	near the usual relationship
2026-01-02	116.13	116.63	+0.21	near the usual relationship
2025-12-31	115.96	116.27	+0.25	near the usual relationship
2025-12-30	117.27	117.29	+0.31	near the usual relationship
2025-12-29	117.29	117.24	+0.33	near the usual relationship
2025-12-26	117.57	117.67	+0.30	near the usual relationship
2025-12-24	117.55	117.93	+0.25	near the usual relationship
2025-12-23	116.99	117.32	+0.26	near the usual relationship
2025-12-22	117.83	118.21	+0.26	near the usual relationship
2025-12-19	117.65	116.80	+0.50	DGX ahead
2025-12-18	117.71	116.80	+0.51	DGX ahead
2025-12-17	119.68	118.56	+0.55	DGX ahead
2025-12-16	119.39	119.62	+0.30	near the usual relationship
2025-12-15	123.03	122.04	+0.53	DGX ahead
2025-12-12	121.99	122.44	+0.27	near the usual relationship
2025-12-11	121.33	122.69	+0.10	near the usual relationship
2025-12-10	119.95	121.42	+0.08	near the usual relationship
2025-12-09	120.03	119.60	+0.44	near the usual relationship
2025-12-08	121.50	120.47	+0.55	DGX ahead
2025-12-05	121.96	119.75	+0.78	DGX ahead
2025-12-04	123.07	121.18	+0.72	DGX ahead
2025-12-03	122.02	123.17	+0.16	near the usual relationship
2025-12-02	121.98	123.25	+0.14	near the usual relationship
2025-12-01	122.80	124.08	+0.14	near the usual relationship
2025-11-28	126.41	124.57	+0.71	DGX ahead
2025-11-26	126.76	124.33	+0.82	DGX ahead
2025-11-25	128.53	125.05	+1.01	DGX ahead
2025-11-24	127.35	122.96	+1.19	DGX ahead
2025-11-21	127.80	123.11	+1.25	DGX ahead
2025-11-20	125.37	121.18	+1.18	DGX ahead
2025-11-19	124.26	120.75	+1.07	DGX ahead
2025-11-18	123.84	120.41	+1.06	DGX ahead
2025-11-17	124.42	121.13	+1.04	DGX ahead
2025-11-14	124.92	123.69	+0.66	DGX ahead
2025-11-13	125.35	124.15	+0.66	DGX ahead
2025-11-12	124.86	123.28	+0.73	DGX ahead
2025-11-11	126.19	124.30	+0.79	DGX ahead
2025-11-10	123.16	121.02	+0.86	DGX ahead
2025-11-07	119.95	117.12	+1.01	DGX ahead
2025-11-06	117.95	114.31	+1.19	DGX ahead
2025-11-05	119.12	116.18	+1.05	DGX ahead
2025-11-04	118.96	116.94	+0.87	DGX ahead
2025-11-03	119.51	119.50	+0.48	near the usual relationship
2025-10-31	117.57	117.70	+0.45	near the usual relationship
2025-10-30	117.44	116.94	+0.58	DGX ahead
2025-10-29	116.79	115.00	+0.84	DGX ahead
2025-10-28	119.13	120.36	+0.25	near the usual relationship
2025-10-27	120.45	127.76	-0.89	LH ahead
2025-10-24	121.74	129.53	-0.97	LH ahead
2025-10-23	122.44	131.62	-1.22	LH ahead
2025-10-22	121.06	131.08	-1.40	LH ahead
2025-10-21	123.38	131.68	-1.07	LH ahead
2025-10-20	127.24	134.83	-0.91	LH ahead
2025-10-17	126.64	132.52	-0.62	LH ahead
2025-10-16	124.84	131.49	-0.78	LH ahead
2025-10-15	125.19	131.04	-0.64	LH ahead
2025-10-14	123.88	129.67	-0.64	LH ahead
2025-10-13	122.14	128.21	-0.71	LH ahead
2025-10-10	123.00	128.79	-0.66	LH ahead
2025-10-09	121.24	128.74	-0.99	LH ahead
2025-10-08	120.88	128.61	-1.05	LH ahead
2025-10-07	121.54	129.59	-1.11	LH ahead
2025-10-06	119.23	127.47	-1.18	LH ahead
2025-10-03	119.83	128.35	-1.23	LH ahead
2025-10-02	120.92	129.51	-1.24	LH ahead
2025-10-01	121.66	129.33	-1.07	LH ahead
2025-09-30	127.35	133.04	-0.66	LH ahead
2025-09-29	126.19	131.04	-0.53	LH ahead
2025-09-26	126.29	130.05	-0.33	near the usual relationship
2025-09-25	123.88	127.98	-0.41	near the usual relationship
2025-09-24	124.84	129.47	-0.50	LH ahead
2025-09-23	124.94	129.74	-0.54	LH ahead
2025-09-22	123.41	129.26	-0.74	LH ahead
2025-09-19	122.69	128.50	-0.75	LH ahead
2025-09-18	122.51	128.45	-0.78	LH ahead
2025-09-17	121.78	127.95	-0.83	LH ahead
2025-09-16	120.39	127.03	-0.94	LH ahead
2025-09-15	120.69	127.64	-1.01	LH ahead
2025-09-12	122.23	128.82	-0.93	LH ahead
2025-09-11	122.59	129.64	-1.02	LH ahead
2025-09-10	120.37	126.50	-0.87	LH ahead
2025-09-09	122.07	128.89	-0.99	LH ahead
2025-09-08	121.97	128.47	-0.94	LH ahead
2025-09-05	122.61	129.15	-0.94	LH ahead
2025-09-04	120.35	127.56	-1.10	LH ahead
2025-09-03	119.95	126.91	-1.06	LH ahead
2025-09-02	119.41	126.89	-1.17	LH ahead
2025-08-29	121.38	128.84	-1.15	LH ahead
2025-08-28	119.75	127.58	-1.25	LH ahead
2025-08-27	120.12	129.44	-1.53	LH ahead
2025-08-26	120.52	129.05	-1.38	LH ahead
2025-08-25	119.39	127.96	-1.42	LH ahead
2025-08-22	120.43	128.92	-1.39	LH ahead
2025-08-21	122.77	128.17	-0.77	LH ahead
2025-08-20	123.22	128.89	-0.82	LH ahead
2025-08-19	122.17	127.81	-0.82	LH ahead
2025-08-18	119.58	125.36	-0.88	LH ahead
2025-08-15	120.13	125.31	-0.76	LH ahead
2025-08-14	119.24	125.71	-1.03	LH ahead
2025-08-13	119.64	126.31	-1.06	LH ahead
2025-08-12	119.40	124.81	-0.82	LH ahead
2025-08-11	119.18	124.05	-0.71	LH ahead
2025-08-08	118.25	123.21	-0.73	LH ahead
2025-08-07	116.45	120.48	-0.55	LH ahead
2025-08-06	115.60	120.89	-0.80	LH ahead
2025-08-05	115.78	122.11	-1.00	LH ahead
2025-08-04	115.23	122.28	-1.16	LH ahead
2025-08-01	114.17	121.19	-1.17	LH ahead
2025-07-31	111.87	120.54	-1.55	LH ahead
2025-07-30	112.75	122.31	-1.73	LH ahead
2025-07-29	112.22	121.30	-1.66	LH ahead
2025-07-28	112.16	121.37	-1.70	LH ahead
2025-07-25	112.63	122.80	-1.91	LH ahead
2025-07-24	114.87	124.06	-1.69	LH ahead
2025-07-23	113.92	116.10	-0.22	near the usual relationship
2025-07-22	119.10	116.82	+0.76	DGX ahead
2025-07-21	111.23	112.64	-0.05	near the usual relationship
2025-07-18	111.53	112.95	-0.05	near the usual relationship
2025-07-17	112.38	114.58	-0.23	near the usual relationship
2025-07-16	111.61	114.00	-0.27	near the usual relationship
2025-07-15	111.21	113.85	-0.34	near the usual relationship
2025-07-14	112.51	115.77	-0.47	near the usual relationship
2025-07-11	112.32	115.69	-0.50	LH ahead
2025-07-10	114.57	117.55	-0.40	near the usual relationship
2025-07-09	116.02	120.07	-0.62	LH ahead
2025-07-08	115.27	119.32	-0.63	LH ahead
2025-07-07	116.25	119.51	-0.46	near the usual relationship
2025-07-03	118.22	121.37	-0.42	near the usual relationship
2025-07-02	118.01	120.50	-0.28	near the usual relationship
2025-07-01	119.83	122.47	-0.30	near the usual relationship
2025-06-30	120.03	121.66	-0.09	near the usual relationship
2025-06-27	118.83	120.77	-0.16	near the usual relationship
2025-06-26	118.32	119.10	+0.09	near the usual relationship
2025-06-25	119.38	119.90	+0.15	near the usual relationship
2025-06-24	120.21	121.67	-0.05	near the usual relationship
2025-06-23	120.09	120.98	+0.08	near the usual relationship
2025-06-20	119.90	121.37	-0.05	near the usual relationship
2025-06-18	120.13	121.14	+0.05	near the usual relationship
2025-06-17	119.58	120.24	+0.12	near the usual relationship
2025-06-16	121.66	122.33	+0.12	near the usual relationship
2025-06-13	120.42	121.02	+0.13	near the usual relationship
2025-06-12	119.64	121.26	-0.09	near the usual relationship
2025-06-11	118.26	120.48	-0.22	near the usual relationship
2025-06-10	118.57	120.21	-0.11	near the usual relationship
2025-06-09	117.54	118.52	+0.02	near the usual relationship
2025-06-06	116.50	117.70	-0.03	near the usual relationship
2025-06-05	116.04	116.86	+0.04	near the usual relationship
2025-06-04	116.14	117.89	-0.16	near the usual relationship
2025-06-03	116.00	116.10	+0.19	near the usual relationship
2025-06-02	116.54	114.87	+0.56	DGX ahead
2025-05-30	115.83	115.39	+0.30	near the usual relationship
2025-05-29	114.93	114.36	+0.32	near the usual relationship
2025-05-28	114.52	114.49	+0.21	near the usual relationship
2025-05-27	116.06	114.79	+0.47	near the usual relationship
2025-05-23	114.42	112.40	+0.64	DGX ahead
2025-05-22	113.34	112.11	+0.47	near the usual relationship
2025-05-21	113.92	111.85	+0.65	DGX ahead
2025-05-20	119.10	116.23	+0.81	DGX ahead
2025-05-19	119.02	115.77	+0.90	DGX ahead
2025-05-16	118.92	115.64	+0.91	DGX ahead
2025-05-15	117.88	114.14	+1.02	DGX ahead
2025-05-14	115.26	112.33	+0.87	DGX ahead
2025-05-13	116.60	115.87	+0.40	near the usual relationship
2025-05-12	117.54	116.30	+0.51	DGX ahead
2025-05-09	118.25	113.89	+1.18	DGX ahead
2025-05-08	117.54	115.29	+0.73	DGX ahead
2025-05-07	117.99	113.96	+1.12	DGX ahead
2025-05-06	117.68	113.05	+1.26	DGX ahead
2025-05-05	118.66	114.39	+1.18	DGX ahead
2025-05-02	118.91	114.78	+1.16	DGX ahead
2025-05-01	118.49	111.82	+1.74	DGX ahead
2025-04-30	119.09	111.70	+1.92	DGX ahead
2025-04-29	119.28	111.42	+2.04	DGX ahead
2025-04-28	118.06	106.41	+3.02	DGX ahead
2025-04-25	116.11	105.81	+2.78	DGX ahead
2025-04-24	117.52	105.94	+3.13	DGX ahead
2025-04-23	115.98	103.88	+3.37	DGX ahead
2025-04-22	115.50	102.08	+3.83	DGX ahead
2025-04-21	108.16	98.35	+3.10	DGX ahead
2025-04-17	109.46	100.63	+2.83	DGX ahead
2025-04-16	109.90	102.22	+2.53	DGX ahead
2025-04-15	111.75	104.75	+2.33	DGX ahead
2025-04-14	112.26	105.69	+2.23	DGX ahead
2025-04-11	109.58	102.64	+2.40	DGX ahead
2025-04-10	109.49	101.32	+2.78	DGX ahead
2025-04-09	109.63	106.82	+1.32	DGX ahead
2025-04-08	106.78	100.89	+2.19	DGX ahead
2025-04-07	109.80	103.58	+2.25	DGX ahead
2025-04-04	109.71	104.28	+2.05	DGX ahead
2025-04-03	114.02	108.20	+2.11	DGX ahead
2025-04-02	112.24	109.55	+1.33	DGX ahead
2025-04-01	113.12	107.82	+1.99	DGX ahead
2025-03-31	113.06	107.86	+1.96	DGX ahead
2025-03-28	111.81	106.60	+1.98	DGX ahead
2025-03-27	110.93	107.37	+1.57	DGX ahead
2025-03-26	111.34	108.14	+1.48	DGX ahead
2025-03-25	110.70	108.66	+1.21	DGX ahead
2025-03-24	111.81	109.58	+1.25	DGX ahead
2025-03-21	111.67	108.55	+1.47	DGX ahead
2025-03-20	111.23	109.27	+1.20	DGX ahead
2025-03-19	112.27	111.10	+1.02	DGX ahead
2025-03-18	115.24	111.08	+1.68	DGX ahead
2025-03-17	115.92	111.43	+1.75	DGX ahead
2025-03-14	113.71	111.01	+1.37	DGX ahead
2025-03-13	112.81	109.21	+1.57	DGX ahead
2025-03-12	111.21	109.76	+1.11	DGX ahead
2025-03-11	112.36	110.88	+1.11	DGX ahead
2025-03-10	115.68	113.14	+1.31	DGX ahead
2025-03-07	117.31	117.27	+0.81	DGX ahead
2025-03-06	114.71	117.75	+0.23	near the usual relationship
2025-03-05	114.94	117.85	+0.27	near the usual relationship
2025-03-04	116.95	119.02	+0.43	near the usual relationship
2025-03-03	118.24	117.74	+0.89	DGX ahead
2025-02-28	115.54	116.35	+0.66	DGX ahead
2025-02-27	114.63	114.84	+0.77	DGX ahead
2025-02-26	115.91	116.82	+0.65	DGX ahead
2025-02-25	117.21	117.19	+0.82	DGX ahead
2025-02-24	116.31	116.53	+0.78	DGX ahead
2025-02-21	115.10	115.79	+0.70	DGX ahead
2025-02-20	115.03	115.48	+0.75	DGX ahead
2025-02-19	114.77	114.85	+0.81	DGX ahead
2025-02-18	113.36	114.14	+0.70	DGX ahead
2025-02-14	112.78	114.24	+0.59	DGX ahead
2025-02-13	112.74	113.49	+0.71	DGX ahead
2025-02-12	109.82	111.76	+0.52	DGX ahead
2025-02-11	111.55	113.61	+0.51	DGX ahead
2025-02-10	110.38	113.58	+0.35	near the usual relationship
2025-02-07	108.68	114.14	+0.01	near the usual relationship
2025-02-06	108.68	114.82	-0.08	near the usual relationship
2025-02-05	110.17	115.86	+0.01	near the usual relationship
2025-02-04	109.16	114.32	+0.08	near the usual relationship
2025-02-03	108.57	114.87	-0.07	near the usual relationship
2025-01-31	108.99	115.77	-0.12	near the usual relationship
2025-01-30	109.70	116.58	-0.12	near the usual relationship
2025-01-29	103.87	114.11	-0.63	LH ahead
2025-01-28	105.00	115.17	-0.60	LH ahead
2025-01-27	106.90	115.71	-0.38	near the usual relationship
2025-01-24	103.76	114.01	-0.60	LH ahead
2025-01-23	101.47	113.23	-0.83	LH ahead
2025-01-22	101.24	112.37	-0.74	LH ahead
2025-01-21	102.00	113.08	-0.71	LH ahead
2025-01-17	101.04	110.56	-0.51	LH ahead
2025-01-16	101.34	110.66	-0.48	near the usual relationship
2025-01-15	100.45	109.98	-0.51	LH ahead
2025-01-14	102.23	108.68	-0.07	near the usual relationship
2025-01-13	102.92	108.50	+0.06	near the usual relationship
2025-01-10	101.43	107.52	-0.02	near the usual relationship
2025-01-08	102.93	108.59	+0.05	near the usual relationship
2025-01-07	102.67	108.96	-0.04	near the usual relationship
2025-01-06	101.75	106.56	+0.16	near the usual relationship
2025-01-03	101.52	106.20	+0.18	near the usual relationship
2025-01-02	100.88	105.76	+0.16	near the usual relationship
2024-12-31	100.81	106.28	+0.08	near the usual relationship
2024-12-30	100.88	106.06	+0.12	near the usual relationship
2024-12-27	101.99	106.79	+0.19	near the usual relationship
2024-12-26	102.25	107.09	+0.19	near the usual relationship
2024-12-24	102.52	106.36	+0.33	near the usual relationship
2024-12-23	102.20	105.59	+0.40	near the usual relationship
2024-12-20	102.31	105.95	+0.37	near the usual relationship
2024-12-19	101.25	105.19	+0.32	near the usual relationship
2024-12-18	101.07	104.88	+0.35	near the usual relationship
2024-12-17	103.90	107.04	+0.46	near the usual relationship
2024-12-16	102.00	106.42	+0.28	near the usual relationship
2024-12-13	103.58	107.53	+0.35	near the usual relationship
2024-12-12	104.29	107.45	+0.46	near the usual relationship
2024-12-11	104.04	106.38	+0.58	DGX ahead
2024-12-10	105.89	108.70	+0.52	DGX ahead
2024-12-09	105.71	109.38	+0.42	near the usual relationship
2024-12-06	105.15	107.79	+0.55	DGX ahead
2024-12-05	105.93	108.87	+0.52	DGX ahead
2024-12-04	107.08	110.02	+0.53	DGX ahead
2024-12-03	108.21	111.49	+0.49	near the usual relationship
2024-12-02	107.93	111.52	+0.46	near the usual relationship
2024-11-29	108.69	111.77	+0.53	DGX ahead
2024-11-27	109.13	112.23	+0.53	DGX ahead
2024-11-26	108.43	110.64	+0.65	DGX ahead
2024-11-25	108.55	111.83	+0.51	DGX ahead
2024-11-22	109.32	111.08	+0.72	DGX ahead
2024-11-21	109.52	111.31	+0.72	DGX ahead
2024-11-20	107.80	110.23	+0.63	DGX ahead
2024-11-19	107.69	109.48	+0.72	DGX ahead
2024-11-18	108.33	110.60	+0.66	DGX ahead
2024-11-15	107.21	109.01	+0.73	DGX ahead
2024-11-14	104.80	110.39	+0.22	near the usual relationship
2024-11-13	107.28	114.11	+0.08	near the usual relationship
2024-11-12	108.05	113.20	+0.30	near the usual relationship
2024-11-11	107.03	113.05	+0.18	near the usual relationship
2024-11-08	106.50	112.34	+0.20	near the usual relationship
2024-11-07	104.38	110.79	+0.11	near the usual relationship
2024-11-06	103.70	108.62	+0.30	near the usual relationship
2024-11-05	102.97	106.18	+0.54	DGX ahead
2024-11-04	103.13	105.28	+0.68	DGX ahead
2024-11-01	103.77	105.25	+0.78	DGX ahead
2024-10-31	103.46	105.79	+0.67	DGX ahead
2024-10-30	104.20	106.85	+0.63	DGX ahead
2024-10-29	104.22	105.71	+0.79	DGX ahead
2024-10-28	104.19	105.38	+0.84	DGX ahead
2024-10-25	103.60	105.96	+0.68	DGX ahead
2024-10-24	105.57	106.63	+0.87	DGX ahead
2024-10-23	104.99	101.91	+1.46	DGX ahead
2024-10-22	105.23	102.20	+1.47	DGX ahead
2024-10-21	98.48	99.24	+0.93	DGX ahead
2024-10-18	100.00	100.00	+1.05	DGX ahead

One-day company-specific moves (4+ standard deviations, which block ideas for 10 sessions): Apr 10, 2025 (DGX -0.1%, LH -5.2%); Jul 24, 2025 (DGX +0.8%, LH +6.9%); Oct 28, 2025 (DGX -1.1%, LH -5.8%); Jul 23, 2026 (DGX +8.6%, LH +3.4%). Upcoming earnings: DGX Oct 22, 2026 (pre-market); LH Oct 28, 2026 (pre-market).

Paired trades

The shared paper book and the replay, kept apart

Forward paper record

No paper position on this pair yet.

Historical simulation (a diagnostic, same rules)

2 simulated trades to Oct 20, 2026: +0.13% per trade on average after costs, 1 won.

Legs	Entered	Exited	Why	Days	Before costs	Costs + borrow	After costs
Long LH · Short DGX	Apr 4, 2025	Apr 23, 2025	divergence stop	19	-$582.72	-$46.33	-$622.21 (-6.22%)
Long LH · Short DGX	Sep 10, 2018	Oct 5, 2018	converged	25	$728.00	-$86.09	$648.86 (+6.49%)

Per $10,000 a leg. A replay on today's companies cannot prove an edge.

The companies

DGX and LH at a glance

DGX Quest Diagnostics Incorporated

Listing: NYSE · SEC CIK 1022079
Industry: Medical Specialities · SIC 8071 Services-Medical Laboratories
Market value: $25.9B
Price history: 2,521 daily closes, Oct 12, 2016 to Oct 22, 2026

LH Labcorp Holdings Inc.

Listing: NYSE · SEC CIK 920148
Industry: Medical Specialities · SIC 8071 Services-Medical Laboratories
Market value: $25.9B
Price history: 2,521 daily closes, Oct 12, 2016 to Oct 22, 2026

Daily prices: Nasdaq.com. Filings and industry codes: SEC EDGAR. Earnings dates: Nasdaq earnings calendar.

All pairs →

Pair	Status	Ahead now	Industry
NTRA / LH	Watchlist	NTRA by 1.97 sd	SIC 8071 Services-Medical Laboratories
NTRA / DGX	Watchlist	NTRA by 1.95 sd	SIC 8071 Services-Medical Laboratories

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Paper only: hypothetical paired positions with modelled costs. No broker, no orders, no real money. A historical simulation is a diagnostic, not proof of an edge. Not investment advice.