BRK.A
−$0
160 sh
BUFFETT WARREN E
Director, 10% Owner, See Remarks, Vice Chairman, Chairman and CEO · SEC CIK 1067983Advertisement
Buy track record
How this insider's open-market purchases have performed100%
of buys now in profit
38 up · 0 down
Avg return since buy+37.9%
Median return+39.3%
Best trade+42.9%
Worst trade+23.0%
Buys scored38 (+2 n/a)
Average return by holding period — separates good entry timing from riding one long winner
After 1 month
+5.0%
100% won · 38 trades
After 3 months
+16.4%
87% won · 38 trades
After 6 months
+30.4%
79% won · 38 trades
After 12 months
+17.8%
88% won · 34 trades
| Date | Company | 90d trend | Buy price | Value | ΔOwn | 1M | 3M | 6M | 12M | To date |
|---|---|---|---|---|---|---|---|---|---|---|
| Aug 4, 2025 | SIRI | $22 | $22.43M | +0.8% | +10.5% | +2.3% | −1.7% | — | +33.5% | |
| Aug 1, 2025 | SIRI | $21 | $40.57M | +1.6% | +10.5% | +4.7% | −1.4% | — | +36.3% | |
| Jul 31, 2025 | SIRI | $21 | $41.62M | +1.7% | +10.8% | +4.0% | −1.1% | — | +36.7% | |
| Jul 31, 2025 | SIRI | $21 | $1.83M | +0.1% | +10.8% | +4.0% | −1.1% | — | +36.7% | |
| Feb 7, 2025 | OXY | $47 | $35.72M | +0.3% | +1.0% | −16.2% | −5.8% | +1.9% | +24.7% | |
| Feb 3, 2025 | SIRI | $23 | $10.17M | +0.4% | +1.2% | −10.4% | −7.8% | −11.9% | +23.1% | |
| Feb 3, 2025 | SIRI | $24 | $6.83M | +0.2% | +1.2% | −10.4% | −7.8% | −11.9% | +23.1% | |
| Jan 31, 2025 | SIRI | $24 | $19.84M | +0.7% | +1.2% | −17.9% | −10.0% | −11.0% | +23.0% | |
| Jan 30, 2025 | SIRI | $23 | $17.12M | +0.6% | +5.1% | −6.3% | +1.5% | −7.6% | +27.8% | |
| Jan 3, 2025 | VRSN | $205 | $2.4M | +0.1% | +5.1% | +24.2% | +39.6% | +17.4% | +38.2% | |
| Jan 3, 2025 | VRSN | $205 | $164K | — | +5.1% | +24.2% | +39.6% | +17.4% | +38.2% | |
| Jan 2, 2025 | VRSN | $205 | $1.2M | — | +5.3% | +24.6% | +37.9% | +18.3% | +38.5% | |
| Dec 31, 2024 | VRSN | $205 | $332K | — | +3.9% | +22.7% | +40.1% | +18.4% | +37.3% | |
| Dec 30, 2024 | VRSN | $203 | $1.02M | — | +4.3% | +23.8% | +41.2% | +20.9% | +38.5% | |
| Dec 30, 2024 | VRSN | $204 | $2.4M | +0.1% | +4.3% | +23.8% | +41.2% | +20.9% | +38.5% | |
| Dec 30, 2024 | VRSN | $205 | $2M | +0.1% | +4.3% | +23.8% | +41.2% | +20.9% | +38.5% | |
| Dec 27, 2024 | VRSN | $203 | $1.34M | +0.1% | +4.3% | +24.9% | +41.4% | +21.2% | +39.3% | |
| Dec 27, 2024 | VRSN | $204 | $3.65M | +0.1% | +4.3% | +24.9% | +41.4% | +21.2% | +39.3% | |
| Dec 27, 2024 | VRSN | $204 | $970.1K | — | +4.3% | +24.9% | +41.4% | +21.2% | +39.3% | |
| Dec 27, 2024 | VRSN | $205 | $513.1K | — | +4.3% | +24.9% | +41.4% | +21.2% | +39.3% | |
| Dec 27, 2024 | VRSN | $206 | $62.8K | — | +4.3% | +24.9% | +41.4% | +21.2% | +39.3% | |
| Dec 26, 2024 | VRSN | $202 | $1.36M | +0.1% | +4.9% | +22.4% | +40.1% | +22.6% | +40.2% | |
| Dec 26, 2024 | VRSN | $203 | $2.24M | +0.1% | +4.9% | +22.4% | +40.1% | +22.6% | +40.2% | |
| Dec 26, 2024 | VRSN | $203 | $21.5K | — | +4.9% | +22.4% | +40.1% | +22.6% | +40.2% | |
| Dec 24, 2024 | VRSN | $200 | $648.5K | — | +4.6% | +21.8% | +41.9% | +23.0% | +41.0% | |
| Dec 24, 2024 | VRSN | $201 | $2.31M | +0.1% | +4.6% | +21.8% | +41.9% | +23.0% | +41.0% | |
| Dec 24, 2024 | VRSN | $202 | $40.3K | — | +4.6% | +21.8% | +41.9% | +23.0% | +41.0% | |
| Dec 23, 2024 | VRSN | $198 | $2.09M | +0.1% | +3.3% | +22.7% | +41.9% | +23.6% | +42.1% | |
| Dec 23, 2024 | VRSN | $199 | $1.89M | +0.1% | +3.3% | +22.7% | +41.9% | +23.6% | +42.1% | |
| Dec 23, 2024 | VRSN | $200 | $2.89M | +0.1% | +3.3% | +22.7% | +41.9% | +23.6% | +42.1% | |
| Dec 23, 2024 | VRSN | $201 | $40.2K | — | +3.3% | +22.7% | +41.9% | +23.6% | +42.1% | |
| Dec 20, 2024 | VRSN | $195 | $1.21M | — | +5.8% | +21.9% | +41.6% | +24.9% | +42.9% | |
| Dec 20, 2024 | VRSN | $197 | $63K | — | +5.8% | +21.9% | +41.6% | +24.9% | +42.9% | |
| Dec 20, 2024 | VRSN | $198 | $213.2K | — | +5.8% | +21.9% | +41.6% | +24.9% | +42.9% | |
| Dec 20, 2024 | VRSN | $199 | $14.59M | +0.6% | +5.8% | +21.9% | +41.6% | +24.9% | +42.9% | |
| Dec 20, 2024 | VRSN | $199 | $1.91M | +0.1% | +5.8% | +21.9% | +41.6% | +24.9% | +42.9% | |
| Dec 20, 2024 | VRSN | $200 | $633K | — | +5.8% | +21.9% | +41.6% | +24.9% | +42.9% | |
| Dec 20, 2024 | VRSN | $201 | $20.1K | — | +5.8% | +21.9% | +41.6% | +24.9% | +42.9% |
How this is calculated. We score only open-market purchases (SEC code
P) — the buys that carry real signal. Each trade's return is measured from the adjusted closing price on the purchase date to the latest close, accounting for stock splits and dividends. The 1M/3M/6M/12M columns show the same trade's return after each fixed holding period; a dash means that horizon hasn't elapsed yet or isn't priceable. Sales are excluded because insiders sell for many routine reasons. With only 38 scored trades, treat this as a small sample, not a verdict.
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Open-market buys
$244.61M
40 trades
Open-market sells
$2.25B
45 trades
Net flow
−$2.01B
Net selling
Total filings
104
transactions shown
Full transaction history
All Form 4 activity across every company, newest firstBRK.A
−$0
18,646 sh
BRK.A
−$0
574 sh
BRK.B
O'sullivan Michael J., BRK.B's See Remarks, spent $225.6K of their own money on 483 shares at $467, growing their stake 380%.
+$225.6K
483 sh @ $467
BRK.B
O'sullivan Michael J., BRK.B's See Remarks, spent $24.9K of their own money on 53 shares at $470, growing their stake 9%.
+$24.9K
53 sh @ $470
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DVA
−$182.86M
1.22M sh @ $150
BRK.A
−$0
22 sh
DVA
−$199.94M
1.66M sh @ $121
LLYVA
−$643.4K
7,685 sh @ $84
LLYVA
−$1.52M
18,125 sh @ $84
LLYVA
−$4.98M
59,411 sh @ $84
LLYVA
−$2.54M
30,643 sh @ $83
LLYVA
−$5.54M
66,568 sh @ $83
LLYVA
−$1.54M
18,689 sh @ $82
LLYVA
−$5.35M
65,071 sh @ $82
LLYVA
−$3.58M
44,100 sh @ $81
LLYVA
−$1.69M
20,226 sh @ $83
BRK.A
−$0
400,000 sh
BRK.A
−$0
410 sh
DVA
−$54.35M
401,514 sh @ $135
BRK.A
−$0
32 sh
BRK.A
−$0
15,000 sh
BRK.A
−$0
32 sh
BRK.A
−$929.5K
2,000 sh @ $465
SIRI
Berkshire Hathaway Inc, SIRI's 10% owner, spent $22.43M of their own money on 1.04M shares at $22, growing their stake 1%.
+$22.43M
1.04M sh @ $22
SIRI
Berkshire Hathaway Inc, SIRI's 10% owner, spent $40.57M of their own money on 1.93M shares at $21, growing their stake 2%.
+$40.57M
1.93M sh @ $21
DVA
−$230.02M
1.64M sh @ $141
SIRI
Berkshire Hathaway Inc, SIRI's 10% owner, spent $41.62M of their own money on 1.98M shares at $21, growing their stake 2%.
+$41.62M
1.98M sh @ $21
SIRI
Berkshire Hathaway Inc, SIRI's 10% owner, spent $1.83M of their own money on 85,389 shares at $21.
+$1.83M
85,389 sh @ $21
VRSN
−$1.21B
4.3M sh @ $282
Frequently asked questions
How is BUFFETT WARREN E's win rate calculated?
We take every open-market purchase (SEC code P) we can match to a stock price, then compare the split- and dividend-adjusted price on the purchase date to the most recent close. The win rate is the share of those buys currently trading above the purchase price. Sales and share grants are not scored.
Why are some buys not included in the score?
A purchase is excluded if we can't price it — for example if the ticker is missing from the filing, the company has been delisted, or the security isn't a common stock we can match to market data. Excluded counts are shown next to the scored total.
What do the 1M / 3M / 6M / 12M columns mean?
They show each purchase's return after a fixed holding period — one, three, six, and twelve months from the buy date — using split- and dividend-adjusted prices. This separates good entry timing from simply holding a long-running winner. A dash means that horizon hasn't elapsed yet for that trade, or the stock couldn't be priced at that date.
Does a high win rate mean I should copy this insider?
No. Past performance does not predict future results, sample sizes are often small, and an insider's edge in their own company doesn't transfer to yours. This is context, not a recommendation. InsiderSource is not investment advice.
Where does this data come from?
Trades come from BUFFETT WARREN E's SEC Form 4 filings on EDGAR. Prices come from public market data and are split/dividend-adjusted. Always verify against the original filings before acting.