Jane Street’s White Mountains Insurance WTM Stock Holding History
Bought
Maintained
Sold
| Quarter | Market Value | Status | Shares |
Change in Stake | Trade Value | Portfolio Weight | Portfolio Position | |
|---|---|---|---|---|---|---|---|---|
|
2026
Q2 | $35.7M | Buy |
17,226
+3,418
| +25% | +$7.32M | ﹤0.01% | 1657 |
|
|
2026
Q1 | $30.3M | Buy |
13,808
+12,101
| +709% | +$25.9M | ﹤0.01% | 1430 |
|
|
2025
Q4 | $3.55M | Sell |
1,707
-3,113
| -65% | -$6.09M | ﹤0.01% | 3767 |
|
|
2025
Q3 | $8.06M | Sell |
4,820
-1,251
| -21% | -$2.23M | ﹤0.01% | 2703 |
|
|
2025
Q2 | $10.9M | Buy |
6,071
+5,493
| +950% | +$9.77M | ﹤0.01% | 2042 |
|
|
2025
Q1 | $1.11M | Buy |
578
+291
| +101% | +$548K | ﹤0.01% | 5363 |
|
|
2024
Q4 | $558K | Sell |
287
-1,020
| -78% | -$1.93M | ﹤0.01% | 6559 |
|
|
2024
Q3 | $2.22M | Buy |
1,307
+380
| +41% | +$663K | ﹤0.01% | 4260 |
|
|
2024
Q2 | $1.68M | Buy |
927
+370
| +66% | +$654K | ﹤0.01% | 4798 |
|
|
2024
Q1 | $999K | Buy |
+557
| New | +$934K | ﹤0.01% | 5416 |
|
|
2023
Q4 | – | Sell |
-241
| Closed | -$360K | – | 9902 |
|
|
2023
Q3 | $360K | Sell |
241
-8
| -3% | -$12.3K | ﹤0.01% | 6771 |
|
|
2023
Q2 | $346K | Sell |
249
-455
| -65% | -$641K | ﹤0.01% | 6903 |
|
|
2023
Q1 | $970K | Sell |
704
-538
| -43% | -$772K | ﹤0.01% | 5048 |
|
|
2022
Q4 | $1.76M | Buy |
1,242
+949
| +324% | +$1.29M | ﹤0.01% | 4048 |
|
|
2022
Q3 | $382K | Sell |
293
-657
| -69% | -$850K | ﹤0.01% | 7185 |
|
|
2022
Q2 | $1.18M | Sell |
950
-64
| -6% | -$74.3K | ﹤0.01% | 5173 |
|
|
2022
Q1 | $1.15M | Buy |
+1,014
| New | +$1.06M | ﹤0.01% | 5839 |
|
|
2021
Q4 | – | Sell |
-1,067
| Closed | -$1.14M | – | 10895 |
|
|
2021
Q3 | $1.14M | Buy |
1,067
+854
| +401% | +$954K | ﹤0.01% | 5649 |
|
|
2021
Q2 | $245K | Buy |
+213
| New | +$249K | ﹤0.01% | 8503 |
|
|
2021
Q1 | – | Sell |
-341
| Closed | -$341K | – | 9655 |
|
|
2020
Q4 | $341K | Sell |
341
-1,655
| -83% | -$1.56M | ﹤0.01% | 6239 |
|
|
2020
Q3 | $1.55M | Buy |
1,996
+914
| +84% | +$790K | ﹤0.01% | 3407 |
|
|
2020
Q2 | $961K | Buy |
1,082
+341
| +46% | +$307K | ﹤0.01% | 4119 |
|
|
2020
Q1 | $674K | Buy |
+741
| New | +$767K | ﹤0.01% | 3306 |
|
|
2019
Q3 | – | Sell |
-598
| Closed | -$611K | – | 5852 |
|
|
2019
Q2 | $611K | Buy |
598
+327
| +121% | +$315K | ﹤0.01% | 3324 |
|
|
2019
Q1 | $251K | Buy |
+271
| New | +$246K | ﹤0.01% | 4443 |
|
|
2017
Q4 | – | Sell |
-842
| Closed | -$722K | – | 5258 |
|
|
2017
Q3 | $722K | Buy |
842
+584
| +226% | +$502K | ﹤0.01% | 2662 |
|
|
2017
Q2 | $224K | Buy |
+258
| New | +$224K | ﹤0.01% | 3918 |
|
|
2014
Q2 | – | Sell |
-824
| Closed | -$494K | – | 3200 |
|
|
2014
Q1 | $494K | Buy |
+824
| New | +$481K | 0.01% | 1576 |
|
Other funds holding WTM
RRAM
CB
WCM
FMI
Jane Street's WTM Position: Q2 2026 in Review
Jane Street increased its White Mountains Insurance (WTM) stake by 25% in Q2 2026, buying an estimated $7.32M and bringing the position to 17,226 shares worth $35.7M. The position accounts for ﹤0.01% of the portfolio, ranked #1657.
Jane Street first reported a position in WTM in Q1 2014 and has held it in 28 quarters since. 332 funds tracked by Wall St. Rank hold WTM as of Q2 2026.
- Jane Street held 17,226 shares of White Mountains Insurance worth $35.7M as of Q2 2026.
- Jane Street bought 3,418 White Mountains Insurance shares in Q2 2026, an estimated $7.32M.
- White Mountains Insurance made up ﹤0.01% of Jane Street's portfolio in Q2 2026, its #1657 holding.
- Jane Street first reported a position in White Mountains Insurance in Q1 2014 and has held it in 28 quarters since.
- 332 funds tracked by Wall St. Rank held White Mountains Insurance as of Q2 2026.
Based on Jane Street's 13F filing for Q2 2026, filed 14 Aug 2026.