I don't have anything for this season, but Bam Adebayo had the highest plus/minus for the Heat in 2025-26, at +331.

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Regular season
2025-26 season

	NAME	+/-	SEASON	TM	GP	MPG	PPG	RPG	APG	SPG	BPG	FGM	FGA	FG%	3PM	3PA	3P%	FTM	FTA	FT%	TS%	OREB	DREB	TPG	MIN	PTS	REB	AST	STL	BLK	TOV	PF
1	Bam Adebayo B. Adebayo	+331	2025-26	MIA	73	32.4	20.1	10.0	3.2	1.2	0.7	6.9	15.7	44.2	1.7	5.5	31.8	4.5	5.8	77.8	55.1	2.0	8.0	1.6	2,365	1,468	732	232	86	49	120	122
2	Davion Mitchell D. Mitchell	+202	2025-26	MIA	70	28.6	9.3	2.7	6.5	1.0	0.2	3.7	7.6	49.0	1.3	3.3	39.5	0.6	0.9	64.6	58.2	0.5	2.2	1.5	2,000	654	186	453	68	11	108	181
3	Jaime Jaquez Jr. J. Jaquez Jr.	+144	2025-26	MIA	75	28.3	15.4	5.0	4.7	0.7	0.3	6.2	12.2	50.7	0.8	2.4	31.7	2.2	2.9	76.9	57.0	1.3	3.7	2.0	2,121	1,152	375	352	51	21	152	137
4	Simone Fontecchio S. Fontecchio	+91	2025-26	MIA	70	16.8	8.5	3.0	1.4	0.5	0.1	2.8	6.7	41.2	1.8	4.7	37.5	1.2	1.5	84.3	57.9	0.8	2.2	0.7	1,173	597	211	101	37	9	49	104
5	Keshad Johnson K. Johnson	+89	2025-26	MIA	32	8.8	4.3	1.9	0.3	0.5	0.3	1.6	3.3	49.0	0.4	1.4	29.5	0.7	0.9	72.4	58.2	0.8	1.1	0.4	280	136	62	8	15	8	13	28
6	Pelle Larsson P. Larsson	+80	2025-26	MIA	70	26.4	11.4	3.5	3.4	0.7	0.2	4.0	8.0	49.6	0.9	2.7	32.3	2.6	3.3	79.7	60.5	1.0	2.5	1.4	1,849	800	244	236	49	16	101	148
7	Myron Gardner M. Gardner	+78	2025-26	MIA	45	9.1	3.6	2.7	1.0	0.4	0.2	1.3	2.7	48.0	0.6	1.4	40.6	0.4	0.6	73.1	60.6	0.9	1.8	0.4	411	163	122	44	20	8	17	78
8	Kasparas Jakučionis K. Jakučionis	+72	2025-26	MIA	53	17.8	6.2	2.6	2.6	0.6	0.1	1.9	4.5	42.9	1.2	2.9	42.3	1.1	1.2	87.9	61.4	0.8	1.8	0.9	945	328	138	137	33	7	50	99
9	Norman Powell N. Powell	+38	2025-26	MIA	58	29.6	21.7	3.5	2.5	1.1	0.2	7.3	15.4	47.0	2.7	7.1	38.0	4.5	5.5	82.7	60.9	0.4	3.1	1.9	1,717	1,261	203	143	64	14	111	127
10	Andrew Wiggins A. Wiggins	+9	2025-26	MIA	68	30.3	15.4	4.8	2.7	1.1	1.0	5.7	12.1	47.5	2.0	4.9	41.4	1.9	2.4	78.4	58.6	1.7	3.1	1.5	2,063	1,045	329	182	76	69	103	156
11	Trevor Keels T. Keels	+5	2025-26	MIA	8	1.9	1.0	0.3	0.0	0.1	0.0	0.4	1.5	25.0	0.3	1.1	22.2	0.0	0.0		33.3	0.0	0.3	0.0	15	8	2	0	1	0	0	0
12	Vladislav Goldin V. Goldin	+5	2025-26	MIA	9	2.7	0.8	1.0	0.3	0.0	0.3	0.3	0.4	75.0	0.0	0.0		0.1	0.1	100.0	78.8	0.3	0.7	0.3	24	7	9	3	0	3	3	5
13	Jahmir Young J. Young	+1	2025-26	MIA	14	4.1	1.8	0.3	0.6	0.1	0.0	0.7	1.8	40.0	0.2	0.6	33.3	0.1	0.1	100.0	48.3	0.1	0.1	0.2	58	25	4	9	1	0	3	7
14	Nikola Jović N. Jović	-3	2025-26	MIA	47	17.2	7.3	3.3	2.2	0.6	0.4	2.4	6.7	36.6	1.0	3.6	26.9	1.5	2.1	68.3	48.0	0.5	2.7	1.4	808	344	153	102	26	17	65	65
15	Tyler Herro T. Herro	-38	2025-26	MIA	33	31.3	20.5	4.8	4.1	0.7	0.4	7.5	15.6	48.0	2.5	6.7	37.8	3.0	3.3	91.7	60.2	0.4	4.4	1.9	1,033	677	158	136	23	12	64	62
16	Kel'el Ware K. Ware	-66	2025-26	MIA	77	22.1	11.1	9.0	0.7	0.8	1.1	4.5	8.4	53.0	1.2	3.0	39.5	0.9	1.2	74.0	61.6	2.8	6.2	0.8	1,704	851	694	56	59	84	62	119
17	Dru Smith D. Smith	-83	2025-26	MIA	70	16.3	5.6	2.5	2.6	1.4	0.3	1.9	4.6	41.5	0.5	1.8	29.5	1.2	1.5	82.9	53.2	0.9	1.6	0.8	1,141	395	173	180	100	21	55	109