Exhibit 99.1

MONTHLY SERVICER'S CERTIFICATE

CARMAX BUSINESS SERVICES, LLC

CARMAX AUTO OWNER TRUST

SERIES 2015-3



Collection Period		4/01/19-4/30/19
Determination Date		5/9/2019
Distribution Date		5/15/2019

Additional information, including defined terms, can be found in the prospectus on the SEC's EDGAR system (http://www.sec.gov) under File No. 333-189212-09.



Pool Balance
1.	Pool Balance on the close of the last day of the preceding Collection Period			$	165,773,630.39
2.	Collections allocable to Principal			$	11,312,426.01
3.	Purchase Amount allocable to Principal			$	0.00
4.	Defaulted Receivables			$	333,525.15
5.	Pool Balance on the close of the last day of the related Collection Period			$	154,127,679.23
	(Ln1 - Ln2 - Ln3 - Ln4)
6.	Total number of Receivables outstanding on the close of the last day of the related Collection Period			23,882
7.	Initial Pool Balance			$	1,000,000,010.35
		Beginning of Period		End of Period
8.	Note Balances
	a. Class A-1 Note Balance	$	0.00	$	0.00
	b. Class A-2a Note Balance	$	0.00	$	0.00
	c. Class A-2b Floating Rate Note Balance	$	0.00	$	0.00
	d. Class A-3 Note Balance	$	0.00	$	0.00
	e. Class A-4 Note Balance	$	96,273,630.34	$	84,627,679.18
	f. Class B Note Balance	$	18,500,000.00	$	18,500,000.00
	g. Class C Note Balance	$	20,000,000.00	$	20,000,000.00
	h. Class D Note Balance	$	26,000,000.00	$	26,000,000.00
	i. Note Balance (sum a - h)	$	160,773,630.34	$	149,127,679.18
9.	Pool Factors
	a. Class A-1 Note Pool Factor	0.0000000		0.0000000
	b. Class A-2a Note Pool Factor	0.0000000		0.0000000
	c. Class A-2b Floating Rate Note Pool Factor	0.0000000		0.0000000
	d. Class A-3 Note Pool Factor	0.0000000		0.0000000
	e. Class A-4 Note Pool Factor	0.8335379		0.7327072
	f. Class B Note Pool Factor	1.0000000		1.0000000
	g. Class C Note Pool Factor	1.0000000		1.0000000
	h. Class D Note Pool Factor	1.0000000		1.0000000
	i. Note Pool Factor	0.1607736		0.1491277
10.	Overcollateralization Target Amount			$	5,000,000.05
11.	Current overcollateralization amount (Pool Balance - Note Balance)			$	5,000,000.05
12.	Weighted Average Coupon			7.73		%
13.	Weighted Average Original Term	months		68.44
14.	Weighted Average Remaining Term	months		21.48
15.	1-Month LIBOR for the interest period ending 5/14/2019			2.47263		%
16.	Note Rate applicable to the Class A-2b notes for the interest period ending 5/14/2019			N/A
Collections
17.	Finance Charges:
	a. Collections allocable to Finance Charge			$	1,077,455.23
	b. Liquidation Proceeds allocable to Finance Charge			$	10,196.83
	c. Purchase Amount allocable to Finance Charge			$	0.00
	d. Available Finance Charge Collections (sum a - c)			$	1,087,652.06
18.	Principal:
	a. Collections allocable to Principal			$	11,312,426.01
	b. Liquidation Proceeds allocable to Principal			$	201,254.85
	c. Purchase Amount allocable to Principal			$	0.00
	d. Available Principal Collections (sum a - c)			$	11,513,680.86
19.	Total Finance Charge and Principal Collections (17d + 18d)			$	12,601,332.92
20.	Interest Income from Collection Account			$	20,373.36
21.	Simple Interest Advances			$	0.00
22.	Available Collections (Ln19 + 20 + 21)			$	12,621,706.28



Available Funds
23.	Available Collections	$	12,621,706.28
24.	Reserve Account Draw Amount	$	0.00
25.	Available Funds	$	12,621,706.28
Application of Available Funds
26.	Servicing Fee
	a. Monthly Servicing Fee	$	138,144.69
	b. Amount Unpaid from Prior Months	$	0.00
	c. Amount Paid	$	138,144.69
	d. Shortfall Amount (a + b - c)	$	0.00
27.	Unreimbursed Servicer Advances	$	0.00
28.	Successor Servicer Unpaid Transition Expenses and Indemnity Amounts (Capped at $175,000)
	a. Unpaid Transition Expenses and Indemnity Amounts (Capped at $175,000)	$	0.00
	b. Amount Paid	$	0.00
	c. Shortfall Amount (a - b)	$	0.00
29.	Class A Noteholder Interest Amounts
	a. Class A-1 Monthly Interest	$	0.00
	b. Additional Note Interest related to Class A-1 Monthly Interest	$	0.00
	c. Interest Due on Additional Note Interest related to Class A-1 Monthly Interest	$	0.00
	d. Total Class A-1 Note Interest (sum a - c)	$	0.00
	e. Class A-2a Monthly Interest	$	0.00
	f. Additional Note Interest related to Class A-2a Monthly Interest	$	0.00
	g. Interest Due on Additional Note Interest related to Class A-2a Monthly Interest	$	0.00
	h. Total Class A-2a Note Interest (sum e - g)	$	0.00
	i. Class A-2b Monthly Interest	$	0.00
	j. Additional Note Interest related to Class A-2b Monthly Interest	$	0.00
	k. Interest Due on Additional Note Interest related to Class A-2b Monthly Interest	$	0.00
	l. Total Class A-2b Note Interest (sum i - k)	$	0.00
	m. Class A-3 Monthly Interest	$	0.00
	n. Additional Note Interest related to Class A-3 Monthly Interest	$	0.00
	o. Interest Due on Additional Note Interest related to Class A-3 Monthly Interest	$	0.00
	p. Total Class A-3 Note Interest (sum m - o)	$	0.00
	m. Class A-4 Monthly Interest	$	158,851.49
	r. Additional Note Interest related to Class A-4 Monthly Interest	$	0.00
	s. Interest Due on Additional Note Interest related to Class A-4 Monthly Interest	$	0.00
	t. Total Class A-4 Note Interest (sum q - s)	$	158,851.49
30.	Priority Principal Distributable Amount	$	0.00
31.	Class B Noteholder Interest Amount
	a. Class B Monthly Interest	$	35,150.00
	b. Additional Note Interest related to Class B Monthly Interest	$	0.00
	c. Interest Due on Additional Note Interest related to Class B Monthly Interest	$	0.00
	d. Total Class B Note Interest (sum a - c)	$	35,150.00
32.	Secondary Principal Distributable Amount	$	0.00
33.	Class C Noteholder Interest Amount
	a. Class C Monthly Interest	$	44,666.67
	b. Additional Note Interest related to Class C Monthly Interest	$	0.00
	c. Interest Due on Additional Note Interest related to Class C Monthly Interest	$	0.00
	d. Total Class C Note Interest (sum a - c)	$	44,666.67
34.	Tertiary Principal Distributable Amount	$	0.00
35.	Class D Noteholder Interest Amount
	a. Class D Monthly Interest	$	70,850.00
	b. Additional Note Interest related to Class D Monthly Interest	$	0.00
	c. Interest Due on Additional Note Interest related to Class D Monthly Interest	$	0.00
	d. Total Class D Note Interest (sum a - c)	$	70,850.00



36.	Quaternary Principal Distributable Amount	$	6,645,951.11
37.	Required Payment Amount (Ln 26 + Ln 28 + (sum of Ln 29 through Ln 36))	$	7,093,613.96
38.	Reserve Account Deficiency	$	0.00
39.	Regular Principal Distributable Amount	$	5,000,000.05
40.	Remaining Unpaid Servicer Transition Expenses, if any	$	0.00
41.	Additional Servicing Fees, if any	$	0.00
42.	Remaining Unpaid Successor Servicer Indemnity Amounts and Transition Expenses, if any	$	0.00
Collection Account Activity
43.	Deposits
	a. Total Daily Deposits of Finance Charge Collections	$	1,087,652.06
	b. Total Daily Deposits of Principal Collections	$	11,513,680.86
	c. Withdrawal from Reserve Account	$	0.00
	d. Interest Income	$	20,373.36
	e. Total Deposits to Collection Account (sum a - d)	$	12,621,706.28
44.	Withdrawals
	a. Servicing Fee and Unreimbursed Servicer Advances	$	138,144.69
	b. Successor Servicer Transition Expenses and Indemnity Amounts	$	0.00
	c. Deposit to Note Payment Account for Monthly Note Interest/Principal	$	11,955,469.32
	d. Deposit to Reserve Account	$	0.00
	e. Excess Collections (Deposit to Certificate Payment Account for payment to Certificateholder)	$	528,092.27
	f. Total Withdrawals from Collection Account (sum a - e)	$	12,621,706.28
Note Payment Account Activity
45.	Deposits
	a. Class A-1 Interest Distribution	$	0.00
	b. Class A-2a Interest Distribution	$	0.00
	c. Class A-2b Interest Distribution	$	0.00
	d. Class A-3 Interest Distribution	$	0.00
	e. Class A-4 Interest Distribution	$	158,851.49
	f. Class B Interest Distribution	$	35,150.00
	g. Class C Interest Distribution	$	44,666.67
	h. Class D Interest Distribution	$	70,850.00
	i. Class A-1 Principal Distribution	$	0.00
	j. Class A-2a Principal Distribution	$	0.00
	k. Class A-2b Principal Distribution	$	0.00
	l. Class A-3 Principal Distribution	$	0.00
	m. Class A-4 Principal Distribution	$	11,645,951.16
	n. Class B Principal Distribution	$	0.00
	o. Class C Principal Distribution	$	0.00
	p. Class D Principal Distribution	$	0.00
	q. Total Deposits to Note Payment Account (sum a - p)	$	11,955,469.32
46.	Withdrawals
	a. Class A-1 Distribution	$	0.00
	b. Class A-2a Distribution	$	0.00
	c. Class A-2b Distribution	$	0.00
	d. Class A-3 Distribution	$	0.00
	e. Class A-4 Distribution	$	11,804,802.65
	f. Class B Distribution	$	35,150.00
	g. Class C Distribution	$	44,666.67
	h. Class D Distribution	$	70,850.00
	i. Total Withdrawals from Note Payment Account (sum a - h)	$	11,955,469.32



Certificate Payment Account Activity
47.	Deposits
	a. Excess Collections	$	528,092.27
	b. Reserve Account surplus (Ln 57)	$	4,851.04
	c. Total Deposits to Certificate Payment Account (sum a - b)	$	532,943.31
48.	Withdrawals
	a. Certificateholder Distribution	$	532,943.31
	b. Total Withdrawals from Certificate Payment Account	$	532,943.31
Required Reserve Account Amount
49.	Lesser of: (a or b)
	a. $2,500,000.03	$	2,500,000.03
	b. Note Balance	$	149,127,679.18
50.	Required Reserve Account Amount	$	2,500,000.03
Reserve Account Reconciliation
51.	Beginning Balance (as of end of preceding Distribution Date)	$	2,500,000.03
52.	Investment Earnings	$	4,851.04
53.	Reserve Account Draw Amount	$	0.00
54.	Reserve Account Amount (Ln 51 + Ln 52 - Ln 53)	$	2,504,851.07
55.	Deposit from Available Funds (Ln 44d)	$	0.00
56.	If Reserve Account Balance exceeds Required Reserve Account Amount, payment to
	a. the Note Payment Account for the payment of principal to the extent of any unfunded Regular Principal Distribution Amount; and	$	0.00
	b. any Successor Servicer for the payment of any unfunded Transition Costs and Additional Servicing Fee	$	0.00
57.	Payment to Certificateholder if Reserve Account Balance exceeds Required Reserve Account Amount and to the extent no unfunded amounts described in Ln 56 exist	$	4,851.04
58.	Ending Balance (Ln54 + Ln55 - Ln56 - Ln57)	$	2,500,000.03
59.	Reserve Account Deficiency (Ln50 - Ln58)	$	0.00
Instructions to the Trustee
60.	Amount to be deposited from the Reserve Account into the Collection Account	$	0.00
61.	Amount to be paid to Servicer from the Collection Account	$	138,144.69
62.	Amount to be deposited from the Collection Account into the Note Payment Account	$	11,955,469.32
63.	Amount to be deposited from the Collection Account into the Certificate Payment Account	$	528,092.27
64.	Amount to be deposited from the Collection Account into the Reserve Account	$	0.00
65.	Amount to be deposited from the Reserve Account, if Reserve Account Balance exceeds Required Reserve Account Amount, into
	a. the Note Payment Account for any unfunded Regular Principal Distributable Amount	$	0.00
	b. the Certificate Payment Account for payment to the Certificateholder, if no unfunded Regular Principal distributable amount exists	$	4,851.04
66.	Amount to be paid to Class A-1 Noteholders from the Note Payment Account	$	0.00
67.	Amount to be paid to Class A-2a Noteholders from the Note Payment Account	$	0.00
68.	Amount to be paid to Class A-2b Noteholders from the Note Payment Account	$	0.00
69.	Amount to be paid to Class A-3 Noteholders from the Note Payment Account	$	0.00
70.	Amount to be paid to Class A-4 Noteholders from the Note Payment Account	$	11,804,802.65
71.	Amount to be paid to Class B Noteholders from the Note Payment Account	$	35,150.00
72.	Amount to be paid to Class C Noteholders from the Note Payment Account	$	44,666.67
73.	Amount to be paid to Class D Noteholders from the Note Payment Account	$	70,850.00
74.	Amount to be paid to Certificateholders from the Certificate Payment Account with respect to Excess Collections and Reserve Account surplus	$	532,943.31



Delinquency Activity
		Number of Loans	Principal Balance
75.	Delinquency Analysis
	a. 31 to 60 days past due	690	$	6,288,024.85
	b. 61 to 90 days past due	307	$	3,035,697.15
	c. 91 to 120 days past due	61	$	576,920.53
	d. 121 or more days past due	1	$	15,841.28
	e. Total Past Due (sum a - d)	1,059	$	9,916,483.81
	f. Delinquent Loans as a percentage of end of period Pool Balance (Ln 75e / Ln 5)		6.4339		%

Loss Activity
		Number of Loans	Principal Balance

76.	Defaulted Receivables (charge-offs)	44	$	333,525.15
77.	Recoveries	162	$	211,451.68
78.	Net Losses (Ln 76 - Ln 77)		$	122,073.47
79.	Ratio of Net Losses to Beginning of Period Pool Balance (Ln 78 / Ln 1)		0.0736		%

Cumulative Loss Activity
		Number of Loans	Principal Balance

80.	Defaulted Receivables (charge-offs)	3,054	$	41,393,034.82
81.	Recoveries	2,631	$	18,776,931.74
82.	Cumulative Net Losses (Ln 80 - Ln 81)		$	22,616,103.08
83.	Ratio of Cumulative Net Losses to Initial Pool Balance (Ln 82 / Ln 7)		2.2616		%
84.	Average Net Loss on Defaulted Receivables		$	7,405.40

Servicer Covenant
85.	CarMax, Inc Consolidated Tangible Net Worth as of the end of the Related Fiscal Quarter		$	3,348,352,000.00
86.	Is CarMax, Inc Consolidated Tangible Net Worth greater than $1,000,000,000?		Yes

IN WITNESS WHEREOF, the undersigned has duly executed this certificate on May 9, 2019.



CARMAX BUSINESS SERVICES, LLC

As Servicer

By:	/s/ Enrique Mayor-Mora

Name:	Enrique Mayor-Mora

Title:	Vice President and Treasurer

CarMax Auto Owner Trust 2015-3 10-D