John Dennis McMahon

Sits on 2 boards. Last updated September 27, 2026

Time on boards

Boards served
2
Current seats
2
Board service
7 years
Director since
2023

7 years of board service in total across 2 boards, counting each seat separately. Longest: Snowflake Inc., 3 years.

Snowflake Inc. Director
3 years ยท Since 2023
MongoDB Inc. Director
3 years ยท Since 2023

Insider trades

All notable trades →

From SEC Forms 4 and 5. Open-market purchases and sales are highlighted; grants, option exercises and shares withheld for tax are routine.

Date Company Transaction Shares Price Value
Jun 25, 2024 MongoDB Inc. Grant or award +129 โ€” โ€”
Jun 24, 2024 MongoDB Inc. Open-market sale โˆ’10,000 $228.00 $2,280,000
Jun 27, 2023 MongoDB Inc. Grant or award +598 โ€” โ€”
Jun 27, 2023 MongoDB Inc. Grant or award +109 โ€” โ€”
May 31, 2023 Snowflake Inc. Option exercise +400,000 $1.41 $564,000
May 31, 2023 Snowflake Inc. Option exercise +30,000 $0.07 $2,100
May 31, 2023 Snowflake Inc. Open-market sale โˆ’79,276 $162.55 $12,886,314
May 31, 2023 Snowflake Inc. Open-market sale โˆ’100,882 $163.27 $16,471,004
May 31, 2023 Snowflake Inc. Open-market sale โˆ’48,598 $164.30 $7,984,651
May 31, 2023 Snowflake Inc. Open-market sale โˆ’1,244 $165.11 $205,397
May 8, 2023 Snowflake Inc. Open-market sale โˆ’1,000 $160.27 $160,270
May 3, 2023 Snowflake Inc. Option exercise +10,000 $0.07 $700
May 3, 2023 Snowflake Inc. Open-market sale โˆ’10,000 $144.07 $1,440,700
Apr 6, 2023 Snowflake Inc. Open-market sale โˆ’1,000 $144.59 $144,590
Apr 3, 2023 Snowflake Inc. Option exercise +10,000 $0.07 $700

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