Prospector Partners’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 | |
|---|---|---|---|---|---|---|---|---|
|
2025
Q4 | $1.02M | Sell |
490
-3,293
| -87% | -$6.44M | 2.18% | 13 |
|
|
2025
Q3 | $6.32M | Sell |
3,783
-293
| -7% | -$523K | 0.76% | 55 |
|
|
2025
Q2 | $7.32M | Buy |
4,076
+221
| +6% | +$393K | 0.84% | 51 |
|
|
2025
Q1 | $7.42M | Hold |
3,855
| – | – | 0.84% | 53 |
|
|
2024
Q4 | $7.5M | Hold |
3,855
| – | – | 0.83% | 54 |
|
|
2024
Q3 | $6.54M | Buy |
3,855
+566
| +17% | +$987K | 0.68% | 56 |
|
|
2024
Q2 | $5.98M | Sell |
3,289
-4
| -0.1% | -$7.08K | 0.67% | 61 |
|
|
2024
Q1 | $5.91M | Buy |
3,293
+25
| +0.8% | +$41.9K | 0.65% | 62 |
|
|
2023
Q4 | $4.92M | Buy |
3,268
+41
| +1% | +$60.9K | 0.61% | 61 |
|
|
2023
Q3 | $4.83M | Hold |
3,227
| – | – | 0.65% | 61 |
|
|
2023
Q2 | $4.48M | Buy |
3,227
+970
| +43% | +$1.37M | 0.63% | 60 |
|
|
2023
Q1 | $3.11M | Sell |
2,257
-823
| -27% | -$1.18M | 0.43% | 72 |
|
|
2022
Q4 | $4.36M | Hold |
3,080
| – | – | 0.6% | 59 |
|
|
2022
Q3 | $4.01M | Sell |
3,080
-20
| -0.6% | -$25.9K | 0.6% | 63 |
|
|
2022
Q2 | $3.86M | Buy |
3,100
+130
| +4% | +$151K | 0.56% | 67 |
|
|
2022
Q1 | $3.38M | Buy |
+2,970
| New | +$3.11M | 0.42% | 76 |
|
|
2019
Q4 | – | Sell |
-2,733
| Closed | -$2.95M | – | 117 |
|
|
2019
Q3 | $2.95M | Sell |
2,733
-2,900
| -51% | -$3.09M | 0.43% | 75 |
|
|
2019
Q2 | $5.75M | Hold |
5,633
| – | – | 0.79% | 43 |
|
|
2019
Q1 | $5.21M | Sell |
5,633
-425
| -7% | -$385K | 0.79% | 46 |
|
|
2018
Q4 | $5.2M | Hold |
6,058
| – | – | 0.81% | 43 |
|
|
2018
Q3 | $5.67M | Hold |
6,058
| – | – | 0.78% | 49 |
|
|
2018
Q2 | $5.49M | Buy |
6,058
+578
| +11% | +$509K | 0.77% | 55 |
|
|
2018
Q1 | $4.51M | Sell |
5,480
-5,125
| -48% | -$4.23M | 0.66% | 58 |
|
|
2017
Q4 | $9.03M | Buy |
10,605
+1,705
| +19% | +$1.49M | 1.32% | 26 |
|
|
2017
Q3 | $7.63M | Buy |
+8,900
| New | +$7.65M | 1.16% | 34 |
|
|
2016
Q2 | – | Sell |
-14,735
| Closed | -$11.8M | – | 159 |
|
|
2016
Q1 | $11.8M | Sell |
14,735
-170
| -1% | -$127K | 2.04% | 5 |
|
|
2015
Q4 | $10.8M | Sell |
14,905
-550
| -4% | -$421K | 1.93% | 6 |
|
|
2015
Q3 | $11.6M | Sell |
15,455
-34,545
| -69% | -$24.9M | 1.66% | 11 |
|
|
2015
Q2 | $32.7M | Hold |
50,000
| – | – | 3.87% | 3 |
|
|
2015
Q1 | $34.2M | Hold |
50,000
| – | – | 2.58% | 3 |
|
|
2014
Q4 | $31.5M | Hold |
50,000
| – | – | 2.39% | 4 |
|
|
2014
Q3 | $31.5M | Hold |
50,000
| – | – | 1.73% | 10 |
|
|
2014
Q2 | $30.4M | Hold |
50,000
| – | – | 1.46% | 13 |
|
|
2014
Q1 | $30M | Hold |
50,000
| – | – | 1.43% | 13 |
|
|
2013
Q4 | $30.2M | Hold |
50,000
| – | – | 1.34% | 16 |
|
|
2013
Q3 | $28.4M | Hold |
50,000
| – | – | 1.29% | 21 |
|
|
2013
Q2 | $28.7M | Buy |
+50,000
| New | +$29.2M | 1.42% | 17 |
|
Other funds holding WTM
RRAM
CB
FMI
WCM
Prospector Partners's WTM Position: Q4 2025 in Review
Prospector Partners reduced its White Mountains Insurance (WTM) stake by 87% in Q4 2025, selling an estimated $6.44M and leaving 490 shares worth $1.02M. The position accounts for 2.18% of the portfolio, ranked #13.
Prospector Partners first reported a position in WTM in Q2 2013 and has held it in 37 quarters since. The position peaked at $34.2M in Q1 2015. 351 funds tracked by Wall St. Rank hold WTM as of Q4 2025.
- Prospector Partners held 490 shares of White Mountains Insurance worth $1.02M as of Q4 2025.
- Prospector Partners sold 3,293 White Mountains Insurance shares in Q4 2025, an estimated $6.44M.
- White Mountains Insurance made up 2.18% of Prospector Partners's portfolio in Q4 2025, its #13 holding.
- Prospector Partners first reported a position in White Mountains Insurance in Q2 2013 and has held it in 37 quarters since.
- Prospector Partners's White Mountains Insurance position peaked at $34.2M in Q1 2015.
- 351 funds tracked by Wall St. Rank held White Mountains Insurance as of Q4 2025.
Based on Prospector Partners's 13F filing for Q4 2025, filed 13 Feb 2026.