Aaron Bummer

Position: Relief Pitcher

Bats: Left • Throws: Left

6-3, 215lb (190cm, 97kg)

Team: Chicago Cubs (minors)

Born: September 21, 1993 in Valencia, CA us

Draft: Drafted by the New York Yankees in the 31st round of the 2011 MLB June Amateur Draft from Sunrise Mountain HS (Peoria, AZ) and the Chicago White Sox in the 19th round of the 2014 MLB June Amateur Draft from University of Nebraska-Lincoln (Lincoln, NE).

High School: Sunrise Mountain HS (Peoria, AZ)

School: University of Nebraska-Lincoln (Lincoln, NE)

Rookie Status: Exceeded rookie limits during 2018 season

2026 Contract Status: Signed thru 2026, 2 yrs/$13M (25-26)

Service Time (01/2026): 7.150 • Free Agent: 2027

Agents: O'Connell Sports Management

Full Name: Aaron James Bummer

Nicknames: Bum

Instagram: @aaron.bummer

View Player Info from the B-R Bullpen

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SUMMARY

2026

Career

WAR

-0.8

3.2

ERA

7.63

3.94

406

15.1

397.0

442

WHIP

1.826

1.335

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Year	Age	AgeDif	Tm	Lg	Lev	Aff	W	L	W-L%	ERA	RA9	G	GS	GF	CG	SHO	SV	IP	H	R	ER	HR	BB	IBB	SO	HBP	BK	WP	BF	WHIP	H9	HR9	BB9	SO9	SO/W
2012	18	-2.5	Nebraska	BTen	NCAA		1	0	1.000	3.26	3.72	20	0			0	0	19.1	16	8	7	0	10	0	22	4	0	1	88	1.345	7.4	0.0	4.7	10.2	2.20
2013	19	-1.4	Nebraska	BTen	NCAA		3	1	.750	2.50	3.04	16	8			0	1	50.1	40	17	14	0	22	0	32	8	0	4	213	1.232	7.2	0.0	3.9	5.7	1.45
2013	19	-1.0	Harwich	CCBL	Smr		5	2	.714	1.41	2.62	7	7	0	0	0	0	44.2	39	13	7	0	14	0	18	3	0	2	181	1.187	7.9	0.0	2.8	3.6	1.29
2014	20	-0.6	Nebraska	BTen	NCAA		7	5	.583	3.34	4.96	15	15			0	0	89.0	92	49	33	2	35	1	56	5	0	5	397	1.427	9.3	0.2	3.5	5.7	1.60
2014	20	-1.2	Great Falls	PION	Rk	CHW	0	0		2.45	2.86	16	0	3	0	0	1	22.0	18	7	6	1	6	0	28	2	0	3	89	1.091	7.4	0.4	2.5	11.5	4.67

2016	22		3 Teams	3 Lgs	A+-Rk	CHW	1	2	.333	4.86	5.40	15	0	3	0	0	0	16.2	16	10	9	0	7	0	18	0	0	4	75	1.380	8.6	0.0	3.8	9.7	2.57
2016	22	-0.9	Winston-Salem	CARL	A+	CHW	0	1	.000	1.80	3.60	4	0	2	0	0	0	5.0	4	2	1	0	1	0	1	0	0	2	22	1.000	7.2	0.0	1.8	1.8	1.00
2016	22	0.6	Great Falls	PION	Rk	CHW	1	1	.500	3.38	3.38	7	0	1	0	0	0	8.0	7	3	3	0	4	0	11	0	0	1	35	1.375	7.9	0.0	4.5	12.4	2.75
2016	22	1.1	White Sox	ARIZ	Rk	CHW	0	0		12.27	12.27	4	0	0	0	0	0	3.2	5	5	5	0	2	0	6	0	0	1	18	1.909	12.3	0.0	4.9	14.7	3.00
2017	23		3 Teams	3 Lgs	AA-A+-AAA	CHW	1	5	.167	3.31	3.49	28	1	13	0	0	5	49.0	44	19	18	4	20	3	54	0	0	4	204	1.306	8.1	0.7	3.7	9.9	2.70
2017	23	-3.4	Charlotte	IL	AAA	CHW	0	0		1.80	3.60	3	0	1	0	0	0	5.0	5	2	1	0	1	0	5	0	0	1	20	1.200	9.0	0.0	1.8	9.0	5.00
2017	23	-1.2	Birmingham	SOUL	AA	CHW	1	3	.250	3.00	3.00	17	1	10	0	0	3	33.0	29	11	11	2	16	3	34	0	0	2	137	1.364	7.9	0.5	4.4	9.3	2.13
2017	23	0.2	Winston-Salem	CARL	A+	CHW	0	2	.000	4.91	4.91	8	0	2	0	0	2	11.0	10	6	6	2	3	0	15	0	0	1	47	1.182	8.2	1.6	2.5	12.3	5.00
2017	23	-5.6	CHW	AL	Maj	CHW	1	3	.250	4.50	4.50	30	0	3	0	0	0	22.0	13	11	11	4	15	1	17	1	0	1	91	1.273	5.3	1.6	6.1	7.0	1.13
2018	24	-2.2	Charlotte	IL	AAA	CHW	2	3	.400	2.64	3.23	31	0	5	0	0	0	30.2	27	11	9	0	11	1	30	0	0	3	128	1.239	7.9	0.0	3.2	8.8	2.73
2018	24	-4.6	CHW	AL	Maj	CHW	0	1	.000	4.26	5.40	37	0	9	0	0	0	31.2	40	19	15	1	10	0	35	1	1	7	144	1.579	11.4	0.3	2.8	9.9	3.50
2019	25	-1.2	Charlotte	IL	AAA	CHW	0	0		2.35	2.35	5	0	1	0	0	0	7.2	7	2	2	0	2	0	6	1	0	1	32	1.174	8.2	0.0	2.3	7.0	3.00
2019	25	-3.4	CHW	AL	Maj	CHW	0	0		2.13	2.26	58	0	5	0	0	1	67.2	43	17	16	4	24	2	60	3	0	4	262	0.990	5.7	0.5	3.2	8.0	2.50
2020	26	-2.2	CHW	AL	Maj	CHW	1	0	1.000	0.96	0.96	9	0	1	0	0	0	9.1	5	1	1	0	5	0	14	0	0	0	38	1.071	4.8	0.0	4.8	13.5	2.80
2021	27	-1.5	CHW	AL	Maj	CHW	5	5	.500	3.51	4.47	62	0	6	0	0	2	56.1	42	28	22	3	29	3	75	4	0	5	242	1.260	6.7	0.5	4.6	12.0	2.59
2022	28	1.0	Charlotte	IL	AAA	CHW	0	0		9.00	9.00	2	0	0	0	0	0	2.0	3	2	2	0	1	0	2	0	0	0	10	2.000	13.5	0.0	4.5	9.0	2.00
2022	28	-0.4	CHW	AL	Maj	CHW	2	1	.667	2.36	3.71	32	0	3	0	0	2	26.2	30	11	7	2	10	0	30	2	0	0	117	1.500	10.1	0.7	3.4	10.1	3.00
2023	29	0.3	CHW	AL	Maj	CHW	5	5	.500	6.79	6.94	61	0	8	0	0	0	58.1	53	45	44	4	36	3	78	5	0	6	267	1.526	8.2	0.6	5.6	12.0	2.17
2024	30	0.9	ATL	NL	Maj	ATL	4	3	.571	3.58	3.90	56	0	13	0	0	0	55.1	61	24	22	2	18	2	69	2	0	2	244	1.428	9.9	0.3	2.9	11.2	3.83
2025	31	1.9	ATL	NL	Maj	ATL	3	2	.600	3.81	4.47	42	2	5	0	0	0	54.1	51	27	23	3	17	4	51	11	0	1	235	1.252	8.4	0.5	2.8	8.4	3.00
2026	32		2 Teams	2 Lgs	AAA-Rk	CHC	1	0	1.000	5.40	5.40	5	1	0	0	0	0	5.0	6	3	3	1	0	0	4	1	0	0	21	1.200	10.8	1.8	0.0	7.2
2026	32	4.7	Iowa	IL	AAA	CHC	0	0		9.00	9.00	3	0	0	0	0	0	3.0	4	3	3	1	0	0	1	1	0	0	14	1.333	12.0	3.0	0.0	3.0
2026	32	11.0	Cubs	ACL	Rk	CHC	1	0	1.000	0.00	0.00	2	1	0	0	0	0	2.0	2	0	0	0	0	0	3	0	0	0	7	1.000	9.0	0.0	0.0	13.5
2026	32	2.7	ATL	NL	Maj	ATL	1	1	.500	7.63	8.80	19	0	3	0	0	0	15.1	18	15	13	6	10	0	13	1	0	0	77	1.826	10.6	3.5	5.9	7.6	1.30
Year	Age	AgeDif	Tm	Lg	Lev	Aff	W	L	W-L%	ERA	RA9	G	GS	GF	CG	SHO	SV	IP	H	R	ER	HR	BB	IBB	SO	HBP	BK	WP	BF	WHIP	H9	HR9	BB9	SO9	SO/W
Majors (10 seasons)					Majors		22	21	.512	3.94	4.49	406	2	56	0	0	5	397.0	356	198	174	29	174	15	442	30	1	26	1717	1.335	8.1	0.7	3.9	10.0	2.54
Minors (7 seasons)					Minors		5	10	.333	3.32	3.65	102	2	25	0	0	6	133.0	121	54	49	6	47	4	142	4	0	15	559	1.263	8.2	0.4	3.2	9.6	3.02
College (3 seasons)					College		11	6	.647	3.06	4.20	51	23			0	1	158.2	148	74	54	2	67	1	110	17	0	10	698	1.355	8.4	0.1	3.8	6.2	1.64
Other (1 season)					Other		5	2	.714	1.41	2.62	7	7	0	0	0	0	44.2	39	13	7	0	14	0	18	3	0	2	181	1.187	7.9	0.0	2.8	3.6	1.29
All Levels (14 Seasons)							43	39	.524	3.49	4.16	566	34	81	0	0	12	733.1	664	339	284	37	302	20	712	54	1	53	3155	1.317	8.1	0.5	3.7	8.7	2.36

AAA (5 seasons)					Minors		2	3	.400	3.17	3.72	44	0	7	0	0	0	48.1	46	20	17	1	15	1	44	2	0	5	204	1.262	8.6	0.2	2.8	8.2	2.93
AA (1 season)					Minors		1	3	.250	3.00	3.00	17	1	10	0	0	3	33.0	29	11	11	2	16	3	34	0	0	2	137	1.364	7.9	0.5	4.4	9.3	2.13
A+ (2 seasons)					Minors		0	3	.000	3.94	4.50	12	0	4	0	0	2	16.0	14	8	7	2	4	0	16	0	0	3	69	1.125	7.9	1.1	2.3	9.0	4.00
Rk (3 seasons)					Minors		2	1	.667	3.53	3.79	29	1	4	0	0	1	35.2	32	15	14	1	12	0	48	2	0	5	149	1.234	8.1	0.3	3.0	12.1	4.00