Amazon.com, Inc.
CH ˙ SWX ˙ US0231351067
SecurityCH:AMZN / Amazon.com, Inc.
InstitutionMairs & Power Inc
Latest Disclosed Ownership2,602,912 shares
Latest Disclosed Value $ 542,108,482
Mairs & Power Inc reports 0.39% increase in ownership of AMZN / Amazon.com, Inc.

On May 13, 2026 - Mairs & Power Inc filed a 13F-HR form disclosing ownership of 2,602,912 shares of Amazon.com, Inc. (CH:AMZN) valued at $542,108,482 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 2,592,768 shares of Amazon.com, Inc.. This represents a change in shares of 0.39% during the quarter.

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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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)
2026-05-13 2026-03-31 13F AMAZON COM COM 023135106 2,602,912 10,144 0.39 542,108 -9.42 5.5396
2026-02-17 2025-12-31 13F AMAZON COM COM 023135106 2,592,768 36,866 1.44 598,463 6.64 5.7598
2025-11-14 2025-09-30 13F AMAZON COM COM 023135106 2,555,902 63,041 2.53 561,199 2.61 5.2746
2025-08-14 2025-06-30 13F AMAZON COM COM 023135106 2,492,861 95,244 3.97 546,909 19.89 5.3987
2025-05-15 2025-03-31 13F AMAZON COM COM 023135106 2,397,617 34,129 1.44 456,171 -12.03 4.7465
2025-02-14 2024-12-31 13F AMAZON COM COM 023135106 2,363,488 505 0.02 518,526 17.77 5.0159
2024-11-14 2024-09-30 13F AMAZON COM COM 023135106 2,362,983 12,586 0.54 440,295 -3.06 4.1414
2024-08-14 2024-06-30 13F AMAZON COM COM 023135106 2,350,397 -79,778 -3.28 454,214 3.62 4.3888
2024-05-15 2024-03-31 13F AMAZON COM COM 023135106 2,430,175 -22,800 -0.93 438,355 17.61 4.2445
2024-02-14 2023-12-31 13F AMAZON COM COM 023135106 2,452,975 -211,476 -7.94 372,705 10.04 3.9271
2023-11-14 2023-09-30 13F AMAZON COM COM 023135106 2,664,451 -59,945 -2.20 338,705 -4.63 3.9751
2023-08-14 2023-06-30 13F AMAZON COM COM 023135106 2,724,396 -8,046 -0.29 355,152 25.84 3.8627
2023-05-15 2023-03-31 13F AMAZON COM COM 023135106 2,732,442 216,372 8.60 282,234 33.54 3.2565
2023-02-14 2022-12-31 13F AMAZON COM COM 023135106 2,516,070 131,213 5.50 211,350 -21.57 2.5441
2022-11-14 2022-09-30 13F AMAZON COM COM 023135106 2,384,857 -258,783 -9.79 269,489 -4.02 3.3999
2022-08-15 2022-06-30 13F AMAZON COM COM 023135106 2,643,640 2,521,216 2,059.41 280,781 -29.65 3.3650
2022-05-16 2022-03-31 13F AMAZON COM COM 023135106 122,424 6,823 5.90 399,096 3.54 4.0202
2022-02-14 2021-12-31 13F AMAZON COM COM 023135106 115,601 8,496 7.93 385,453 9.55 3.5699
2021-11-15 2021-09-30 13F AMAZON COM COM 023135106 107,105 25,016 30.47 351,844 24.59 3.5202
2021-08-16 2021-06-30 13F AMAZON COM COM 023135106 82,089 23,615 40.39 282,399 56.09 2.7909
2021-05-14 2021-03-31 13F AMAZON COM COM 023135106 58,474 18,120 44.90 180,923 37.66 1.8994
2021-02-16 2020-12-31 13F AMAZON COM COM 023135106 40,354 39,743 6,504.58 131,430 6,731.08 1.4605
2020-11-16 2020-09-30 13F AMAZON COM COM 023135106 611 4 0.66 1,924 14.87 0.0240
2020-08-14 2020-06-30 13F AMAZON COM COM 023135106 607 45 8.01 1,675 52.83 0.0219
2020-05-15 2020-03-31 13F AMAZON COM COM 023135106 562 45 8.70 1,096 14.76 0.0160
2020-02-14 2019-12-31 13F Amazon Com COM 023135106 517 43 9.07 955 16.04 0.0108
2019-11-14 2019-09-30 13F Amazon Com COM 023135106 474 -127 -21.13 823 -27.68 0.0099
2019-08-14 2019-06-30 13F Amazon Com COM 023135106 601 -15 -2.44 1,138 3.74 0.0137
2019-05-15 2019-03-31 13F Amazon Com COM 023135106 616 0 0.00 1,097 18.59 0.0133
2019-02-14 2018-12-31 13F Amazon Com COM 023135106 616 0 0.00 925 -25.04 0.0125
2018-11-14 2018-09-30 13F Amazon Com COM 023135106 616 10 1.65 1,234 19.81 0.0144
2018-08-14 2018-06-30 13F Amazon Com COM 023135106 606 20 3.41 1,030 21.46 0.0128
2018-05-15 2018-03-31 13F Amazon Com COM 023135106 586 167 39.86 848 73.06 0.0105
2018-02-14 2017-12-31 13F Amazon Com COM 023135106 419 -10 -2.33 490 18.93 0.0057
2017-11-14 2017-09-30 13F Amazon Com COM 023135106 429 -46 -9.68 412 -10.43 0.0049
2017-08-14 2017-06-30 13F Amazon Com COM 023135106 475 -10 -2.06 460 6.98 0.0056
2017-05-15 2017-03-31 13F Amazon Com COM 023135106 485 40 8.99 430 28.74 0.0053
2017-02-14 2016-12-31 13F Amazon Com COM 023135106 445 61 15.89 334 3.73 0.0043
2016-11-14 2016-09-30 13F Amazon Com COM 023135106 384 0 0.00 322 17.09 0.0042
2016-08-15 2016-06-30 13F Amazon Com COM 023135106 384 31 8.78 275 30.95 0.0037
2016-05-16 2016-03-31 13F Amazon Com COM 023135106 353 -500 -58.62 210 -63.60 0.0030
2016-02-16 2015-12-31 13F Amazon Com COM 023135106 853 125 17.17 577 54.69 0.0086
2015-11-16 2015-09-30 13F Amazon Com COM 023135106 728 0 0.00 373 18.04 0.0058
2015-08-14 2015-06-30 13F Amazon Com COM 023135106 728 0 0.00 316 16.61 0.0045
2015-05-15 2015-03-31 13F Amazon Com COM 023135106 728 -200 -21.55 271 -5.90 0.0037
2015-02-17 2014-12-31 13F Amazon Com COM 023135106 928 -75 -7.48 288 -10.84 0.0040
2014-11-14 2014-09-30 13F Amazon Com COM 023135106 1,003 -150 -13.01 323 -13.64 0.0047
2014-08-14 2014-06-30 13F Amazon Com COM 023135106 1,153 -36 -3.03 374 -6.50 0.0053
2014-05-15 2014-03-31 13F Amazon Com COM 023135106 1,189 -310 -20.68 400 -33.11 0.0059
2014-02-14 2013-12-31 13F Amazon Com COM 023135106 1,499 1,499 598 0.0092
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.