| 2026-07-29 | 10-Q | Shares outstanding as of 2026-07-24 | 192,852,536 |
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| 2023-05-03 | 10-Q | Stock registered under Section 12(b) | Registered Shares, CHF 0.10 Per Share Par Value · GRMN · NYSE |
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| 2023-02-22 | 10-K | Stock registered under Section 12(b) | Registered Shares, CHF 0.10 Per Share Par Value · GRMN · NYSE |
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| 2022-10-26 | 10-Q | Stock registered under Section 12(b) | Registered Shares, CHF 0.10 Per Share Par Value · GRMN · NYSE |
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| 2022-07-27 | 10-Q | Stock registered under Section 12(b) | Registered Shares, CHF 0.10 Per Share Par Value · GRMN · NYSE |
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| 2022-04-27 | 10-Q | Stock registered under Section 12(b) | Registered Shares, CHF 0.10 Per Share Par Value · GRMN · NYSE |
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| 2022-02-16 | 10-K | Stock registered under Section 12(b) | Registered Shares, CHF 0.10 Per Share Par Value · GRMN · NYSE |
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| 2021-10-27 | 10-Q | Stock registered under Section 12(b) | Registered Shares, CHF 0.10 Per Share Par Value · GRMN · NASDAQ |
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| 2021-07-28 | 10-Q | Stock registered under Section 12(b) | Registered Shares, CHF 0.10 Per Share Par Value · GRMN · NASDAQ |
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| 2021-04-30 | 10-Q/A | Stock registered under Section 12(b) | Registered Shares, CHF 0.10 Per Share Par Value · GRMN · NASDAQ |
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| 2021-04-28 | 10-Q | Stock registered under Section 12(b) | Registered Shares, CHF 0.10 Per Share Par Value · GRMN · NASDAQ |
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| 2021-02-17 | 10-K | Stock registered under Section 12(b) | Registered Shares, CHF 0.10 Per Share Par Value · GRMN · NASDAQ |
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| 2020-10-28 | 10-Q | Stock registered under Section 12(b) | Registered Shares, CHF 0.10 Per Share Par Value · GRMN · NASDAQ |
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| 2020-07-29 | 10-Q | Stock registered under Section 12(b) | Registered Shares, CHF 0.10 Per Share Par Value · GRMN · NASDAQ |
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| 2020-04-29 | 10-Q | Stock registered under Section 12(b) | Registered Shares, CHF 0.10 Per Share Par Value · GRMN · NASDAQ |
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| 2020-02-19 | 10-K | Stock registered under Section 12(b) | Registered Shares, CHF 0.10 Per Share Par Value · GRMN · NASDAQ |
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| 2019-10-30 | 10-Q | Stock registered under Section 12(b) | Registered
Shares, CHF 0.10 Per Share Par Value · GRMN · NASDAQ |
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| 2019-07-31 | 10-Q | Stock registered under Section 12(b) | Common Shares, CHF 0.10 Per Share Par Value · GRMN · NASDAQ |
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| 2018-08-01 | 10-Q | Well-known seasoned issuer | No |
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| 2018-05-02 | 10-Q | Well-known seasoned issuer | No |
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| 2017-11-01 | 10-Q | Well-known seasoned issuer | No |
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| 2017-05-03 | 10-Q | Well-known seasoned issuer | No |
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| 2016-10-26 | 10-Q | Well-known seasoned issuer | No |
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| 2016-07-27 | 10-Q | Well-known seasoned issuer | No |
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