CarMax, Inc.
MX ˙ BMV ˙ US1431301027
SecurityMX:KMX / CarMax, Inc.
InstitutionLMR Partners LLP
Latest Disclosed Ownership42,000 shares
Latest Disclosed Value $ 1,746,360
LMR Partners LLP ownership in KMX / CarMax, Inc.

On May 15, 2026 - LMR Partners LLP filed a 13F-HR form disclosing ownership of 42,000 shares of CarMax, Inc. (MX:KMX) valued at $1,746,360 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 9,801 shares of CarMax, Inc.. This represents a change in shares of 328.53% during the quarter.

LMR Partners LLP has a history of taking positions in derivatives of the underlying security (KMX) in the form of stock options. The firm currently holds call options representing 0 of underlying shares valued at $0 USD and put options representing 100,000 of underlying shares valued at $4,158,000 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:KMX / CarMax, Inc. Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F CARMAX COM 143130102 42,000 32,199 328.53 1,746 361.90 0.0031
2026-02-17 2025-12-31 13F CARMAX COM 143130102 9,801 -5,580 -36.28 379 -45.22 0.0007
2025-11-14 2025-09-30 13F CARMAX COM 143130102 15,381 1 0.01 690 -33.20 0.0030
2025-08-14 2025-06-30 13F CARMAX COM 143130102 15,380 15,380 1,034 0.0074
2025-02-14 2024-12-31 13F CARMAX COM 143130102 0 -3,081 -100.00 0 -100.00
2024-11-07 2024-09-30 13F CARMAX COM 143130102 3,081 3,081 238 0.0019
2023-11-14 2023-09-30 13F CARMAX COM 143130102 0 -50,001 -100.00 0 -100.00
2023-08-14 2023-06-30 13F CARMAX COM 143130102 50,001 50,001 4,185 0.0465
2020-11-16 2020-09-30 13F CARMAX COM 143130102 0 -20,536 -100.00 0 -100.00
2020-08-14 2020-06-30 13F CARMAX COM 143130102 20,536 20,536 1,839 0.0458
2020-08-14 2020-03-31 13F/A-1 CARMAX COM 143130102 0 -10,592 -100.00 0 -100.00
2020-02-14 2019-12-31 13F CARMAX COM 143130102 10,592 10,592 929 0.0015
2018-08-03 2018-06-30 13F CARMAX COM 143130102 0 -13,625 -100.00 0 -100.00
2018-05-04 2018-03-31 13F CARMAX COM 143130102 13,625 0 0.00 874 0.00 0.0898
2018-01-30 2017-12-31 13F CARMAX COM 143130102 13,625 4,579 50.62 874 27.41 0.0898
2017-11-09 2017-09-30 13F CARMAX COM 143130102 9,046 9,046 686 0.0743
2017-08-03 2017-06-30 13F CARMAX COM 143130102 0 -4,179 -100.00 0 -100.00
2017-05-11 2017-03-31 13F CARMAX COM 143130102 4,179 608 17.03 247 7.39 0.0237
2017-02-07 2016-12-31 13F CARMAX COM 143130102 3,571 -8,176 -69.60 230 -63.32 0.0353
2016-11-04 2016-09-30 13F/A-1 CARMAX COM 143130102 11,747 -8,614 -42.31 627 -37.24 0.0595
2016-11-01 2016-09-30 13F CARMAX COM 143130102 11,747 627
2016-11-04 2016-06-30 13F/A-1 CARMAX COM 143130102 20,361 20,361 0.00 999 0.1547
2016-07-28 2016-06-30 13F CARMAX COM 143130102 20,361 999
2015-11-05 2015-09-30 13F CARMAX COM 143130102 0 -21,320 -100.00 0 -100.00
2015-08-10 2015-06-30 13F CARMAX COM 143130102 21,320 11,308 112.94 1,412 104.34 0.1726
2015-04-20 2015-03-31 13F CARMAX COM 143130102 10,012 -4,773 -32.28 691 -29.85 0.0956
2015-01-20 2014-12-31 13F CARMAX COM 143130102 14,785 14,785 985 0.1287
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-02-17 2025-12-31 13F CARMAX COM Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-11-14 2025-09-30 13F CARMAX COM Call 29,900 1,342 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F CARMAX COM Put 100,000 920.41 4,158 1,000.00 n/a n/a n/a
2026-02-17 2025-12-31 13F CARMAX COM Put 9,800 0.00 379 -13.90 n/a n/a n/a
2025-11-14 2025-09-30 13F CARMAX COM Put 9,800 440 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.