MAIRS & POWER INC: AMAZON.COM (AMZN): Quarterly 13F Position History
As of Q1 2026, MAIRS & POWER INC reported 2,602,912 shares of AMAZON.COM (AMZN), worth $542.1M and representing 5.5% of its 13F equity book. Quarter-over-quarter share count change: + 10,144 (+0.4%) . The position first appeared in Q1 2016 and has been disclosed across 41 13F-HR filings in Pactolio's tracked window.
- 2,602,912Shares Held (Latest Filing)
- $542.1MReported Market Value (Latest Filing)
- 5.5%Portfolio Weight (% of 13F Equity Book)
- +10,144Quarter-over-Quarter Share Change
- -$56.4MQuarter-over-Quarter Value Change
- 2,732,442Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 41 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 2,602,912 | +10,144 | +0.4% | $542.1M | 5.5% | $208.3 |
| Q4 2025 | 2,592,768 | +36,866 | +1.4% | $598.5M | 5.8% | $230.8 |
| Q3 2025 | 2,555,902 | +63,041 | +2.5% | $561.2M | 5.3% | $219.6 |
| Q2 2025 | 2,492,861 | +95,244 | +4.0% | $546.9M | 5.4% | $219.4 |
| Q1 2025 | 2,397,617 | +34,129 | +1.4% | $456.2M | 4.7% | $190.3 |
| Q4 2024 | 2,363,488 | +505 | +0.0% | $518.5M | 5.0% | $219.4 |
| Q3 2024 | 2,362,983 | +12,586 | +0.5% | $440.3M | 4.1% | $186.3 |
| Q2 2024 | 2,350,397 | 79,778 | -3.3% | $454.2M | 4.4% | $193.3 |
| Q1 2024 | 2,430,175 | 22,800 | -0.9% | $438.4M | 4.2% | $180.4 |
| Q4 2023 | 2,452,975 | 211,476 | -7.9% | $372.7M | 3.9% | $151.9 |
| Q3 2023 | 2,664,451 | 59,945 | -2.2% | $338.7M | 4.0% | $127.1 |
| Q2 2023 | 2,724,396 | 8,046 | -0.3% | $355.2M | 3.9% | $130.4 |
| Q1 2023 | 2,732,442 | +216,372 | +8.6% | $282.2M | 3.3% | $103.3 |
| Q4 2022 | 2,516,070 | +131,213 | +5.5% | $211.3M | 2.5% | $84.0 |
| Q3 2022 | 2,384,857 | 258,783 | -9.8% | $269.5M | 3.4% | $113.0 |
| Q2 2022 | 2,643,640 | +2,521,216 | +2059.4% | $280.8M | 3.4% | $106.2 |
| Q1 2022 | 122,424 | +6,823 | +5.9% | $399.1M | 4.0% | $3259.9 |
| Q4 2021 | 115,601 | +8,496 | +7.9% | $385.5M | 3.6% | $3334.3 |
| Q3 2021 | 107,105 | +25,016 | +30.5% | $351.8M | 3.5% | $3285.0 |
| Q2 2021 | 82,089 | +23,615 | +40.4% | $282.4M | 2.8% | $3440.2 |
| Q1 2021 | 58,474 | +18,120 | +44.9% | $180.9M | 1.9% | $3094.1 |
| Q4 2020 | 40,354 | +39,743 | +6504.6% | $131.4M | 1.5% | $3256.9 |
| Q3 2020 | 611 | +4 | +0.7% | $1.9M | 0.0% | $3148.9 |
| Q2 2020 | 607 | +45 | +8.0% | $1.7M | 0.0% | $2759.5 |
| Q1 2020 | 562 | +45 | +8.7% | $1.1M | 0.0% | $1950.2 |
| Q4 2019 | 517 | +43 | +9.1% | $955.0K | 0.0% | $1847.2 |
| Q3 2019 | 474 | 127 | -21.1% | $823.0K | 0.0% | $1736.3 |
| Q2 2019 | 601 | 15 | -2.4% | $1.1M | 0.0% | $1893.5 |
| Q1 2019 | 616 | 0 | — | $1.1M | 0.0% | $1780.8 |
| Q4 2018 | 616 | 0 | — | $925.0K | 0.0% | $1501.6 |
| Q3 2018 | 616 | +10 | +1.7% | $1.2M | 0.0% | $2003.2 |
| Q2 2018 | 606 | +20 | +3.4% | $1.0M | 0.0% | $1699.7 |
| Q1 2018 | 586 | +167 | +39.9% | $848.0K | 0.0% | $1447.1 |
| Q4 2017 | 419 | 10 | -2.3% | $490.0K | 0.0% | $1169.5 |
| Q3 2017 | 429 | 46 | -9.7% | $412.0K | 0.0% | $960.4 |
| Q2 2017 | 475 | 10 | -2.1% | $460.0K | 0.0% | $968.4 |
| Q1 2017 | 485 | +40 | +9.0% | $430.0K | 0.0% | $886.6 |
| Q4 2016 | 445 | +61 | +15.9% | $334.0K | 0.0% | $750.6 |
| Q3 2016 | 384 | 0 | — | $322.0K | 0.0% | $838.5 |
| Q2 2016 | 384 | +31 | +8.8% | $275.0K | 0.0% | $716.1 |
| Q1 2016 | 353 | — | — | $210.0K | 0.0% | $594.9 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did MAIRS & POWER INC first disclose a AMZN position in 13F-HR filings?
MAIRS & POWER INC first reported AMAZON.COM (AMZN) on its 13F-HR filing for the period ending 2016-03-31 (Q1 2016). The position has appeared on 41 reported quarters within Pactolio's tracked window.
What was MAIRS & POWER INC's most recent quarter-over-quarter share-count change in AMZN?
Between Q4 2025 and Q1 2026, MAIRS & POWER INC added 10,144 shares of AMZN (+0.4%), bringing the total reported position to 2,602,912 shares at a market value of $542.1M.
Does the implied price-per-share represent MAIRS & POWER INC's cost basis in AMZN?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.