Gayner Thomas Sinnickson has been a registered insider at 3 firms since 2004.
As Chief Executive Officer at Markel Corporation, Gayner Thomas Sinnickson last made a transaction on 2/7/2025.
As a Director at Washington Post Co., Gayner Thomas Sinnickson last made a transaction on 9/12/2024.
As a Director at Cable One, Inc., Gayner Thomas Sinnickson last made a transaction on 3/6/2023.
InsiderInsights.com Purchase Scorecard
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Transaction Date
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Nq |
Hit
Rate
|
Mean
Return
|
Median
Return
|
Range of
Returns
|
Time From
Purchases
|
Nq |
Hit
Rate
|
Mean
Return
|
Median
Return
|
Range of
Returns
|
| 10 |
80% |
15% |
14% |
32 |
1 Year |
11 |
0% |
-- |
-- |
-- |
| 11 |
82% |
11% |
11% |
30 |
9 Month |
11 |
0% |
-- |
-- |
-- |
| 12 |
75% |
9% |
11% |
26 |
6 Month |
12 |
0% |
-- |
-- |
-- |
| 12 |
67% |
4% |
5% |
29 |
3 Month |
12 |
0% |
-- |
-- |
-- |
| 12 |
67% |
3% |
3% |
19 |
1 Month |
12 |
0% |
-- |
-- |
-- |
| 12 |
83% |
1% |
2% |
14 |
1 Week |
12 |
0% |
-- |
-- |
-- |
InsiderInsights.com Sales Scorecard
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Transaction Date
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Nq |
Hit
Rate
|
Mean
Return
|
Median
Return
|
Range of
Returns
|
Time From
Sales
|
Nq |
Hit
Rate
|
Mean
Return
|
Median
Return
|
Range of
Returns
|
| 1 |
0% |
14% |
-- |
-- |
1 Year |
1 |
0% |
-- |
-- |
-- |
| 1 |
0% |
3% |
-- |
-- |
9 Month |
1 |
0% |
-- |
-- |
-- |
| 1 |
0% |
9% |
-- |
-- |
6 Month |
1 |
0% |
-- |
-- |
-- |
| 1 |
0% |
14% |
-- |
-- |
3 Month |
1 |
0% |
-- |
-- |
-- |
| 1 |
0% |
5% |
-- |
-- |
1 Month |
1 |
0% |
-- |
-- |
-- |
| 1 |
0% |
4% |
-- |
-- |
1 Week |
1 |
0% |
-- |
-- |
-- |
| Scorecards Updated 10/30/2025 11:09 AM EST |
Latest Transaction Date: |
2/7/2025 |
| Average days between Transaction and Entered Dates: |
2 |
InsiderInsights.com Purchase Scorecard
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|
Transaction Date
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Nq |
Hit
Rate
|
Mean
Return
|
Median
Return
|
Range of
Returns
|
Time From
Purchases
|
Nq |
Hit
Rate
|
Mean
Return
|
Median
Return
|
Range of
Returns
|
| 6 |
100% |
31% |
29% |
53 |
1 Year |
6 |
0% |
-- |
-- |
-- |
| 6 |
100% |
15% |
20% |
20 |
9 Month |
6 |
0% |
-- |
-- |
-- |
| 6 |
100% |
13% |
14% |
25 |
6 Month |
6 |
0% |
-- |
-- |
-- |
| 6 |
83% |
9% |
10% |
17 |
3 Month |
6 |
0% |
-- |
-- |
-- |
| 6 |
83% |
2% |
1% |
10 |
1 Month |
6 |
0% |
-- |
-- |
-- |
| 6 |
67% |
0% |
0% |
6 |
1 Week |
6 |
0% |
-- |
-- |
-- |
InsiderInsights.com Sales Scorecard
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Transaction Date
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Nq |
Hit
Rate
|
Mean
Return
|
Median
Return
|
Range of
Returns
|
Time From
Sales
|
Nq |
Hit
Rate
|
Mean
Return
|
Median
Return
|
Range of
Returns
|
| -- |
-- |
-- |
-- |
-- |
1 Year |
-- |
-- |
-- |
-- |
-- |
| -- |
-- |
-- |
-- |
-- |
9 Month |
-- |
-- |
-- |
-- |
-- |
| -- |
-- |
-- |
-- |
-- |
6 Month |
-- |
-- |
-- |
-- |
-- |
| -- |
-- |
-- |
-- |
-- |
3 Month |
-- |
-- |
-- |
-- |
-- |
| -- |
-- |
-- |
-- |
-- |
1 Month |
-- |
-- |
-- |
-- |
-- |
| -- |
-- |
-- |
-- |
-- |
1 Week |
-- |
-- |
-- |
-- |
-- |
| Scorecards Updated 10/30/2025 11:09 AM EST |
Latest Transaction Date: |
9/12/2024 |
| Average days between Transaction and Entered Dates: |
2 |
InsiderInsights.com Purchase Scorecard
|
|
|
Transaction Date
|
|
Nq |
Hit
Rate
|
Mean
Return
|
Median
Return
|
Range of
Returns
|
Time From
Purchases
|
Nq |
Hit
Rate
|
Mean
Return
|
Median
Return
|
Range of
Returns
|
| 9 |
0% |
-39% |
-43% |
33 |
1 Year |
9 |
0% |
-- |
-- |
-- |
| 9 |
11% |
-32% |
-38% |
54 |
9 Month |
9 |
0% |
-- |
-- |
-- |
| 9 |
11% |
-29% |
-40% |
47 |
6 Month |
9 |
0% |
-- |
-- |
-- |
| 9 |
22% |
-15% |
-12% |
63 |
3 Month |
9 |
0% |
-- |
-- |
-- |
| 9 |
33% |
-10% |
-1% |
39 |
1 Month |
9 |
0% |
-- |
-- |
-- |
| 9 |
22% |
-3% |
-2% |
12 |
1 Week |
9 |
0% |
-- |
-- |
-- |
InsiderInsights.com Sales Scorecard
|
|
|
Transaction Date
|
|
Nq |
Hit
Rate
|
Mean
Return
|
Median
Return
|
Range of
Returns
|
Time From
Sales
|
Nq |
Hit
Rate
|
Mean
Return
|
Median
Return
|
Range of
Returns
|
| -- |
-- |
-- |
-- |
-- |
1 Year |
-- |
-- |
-- |
-- |
-- |
| -- |
-- |
-- |
-- |
-- |
9 Month |
-- |
-- |
-- |
-- |
-- |
| -- |
-- |
-- |
-- |
-- |
6 Month |
-- |
-- |
-- |
-- |
-- |
| -- |
-- |
-- |
-- |
-- |
3 Month |
-- |
-- |
-- |
-- |
-- |
| -- |
-- |
-- |
-- |
-- |
1 Month |
-- |
-- |
-- |
-- |
-- |
| -- |
-- |
-- |
-- |
-- |
1 Week |
-- |
-- |
-- |
-- |
-- |
| Scorecards Updated 10/30/2025 11:09 AM EST |
Latest Transaction Date: |
3/6/2023 |
| Average days between Transaction and Entered Dates: |
2 |
