InsiderSource
BRK-B

BERKSHIRE HATHAWAY INC

SEC CIK 1067983
$485.79 −1.6% · 90 days
90-day buys
$250.5K
2 open-market
90-day sells
$182.86M
1 open-market
Net insider flow
−$182.61M
Net selling
Filings shown
56
Most recent

At a glance

Over the last 90 days, insiders at BRK-B have sold a net $182.61M of stock (2 open-market buys vs 1 sell).

Largest recent trade: Berkshire Hathaway Inc sold $1.21B of VRSN, trimming their stake 32%.

Most active filer: Berkshire Hathaway Inc, with 27 transactions among the recent filings shown.

Insider transaction history

Form 4 filings for BRK-B, newest first
View on SEC EDGAR ↗
BRK.B
BERKSHIRE HATHAWAY INC
Buy O'Sullivan Michael J. · See Remarks · Open-market purchase · filed May 6, 2026 ΔOwn +380%

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
BERKSHIRE HATHAWAY INC
Buy O'Sullivan Michael J. · See Remarks · Open-market purchase · filed May 6, 2026 ΔOwn +8.7%

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
DVA
DAVITA INC.
Sell BERKSHIRE HATHAWAY INC · 10% Owner · Open-market sale · filed May 5, 2026 ΔOwn −4.1%

Berkshire Hathaway Inc sold $182.86M of DVA, trimming their stake 4%.

−$182.86M
1.22M sh @ $150
DVA
DAVITA INC.
Sell BERKSHIRE HATHAWAY INC · 10% Owner · Open-market sale · filed Feb 2, 2026 ΔOwn −5.2%

Berkshire Hathaway Inc sold $199.94M of DVA, trimming their stake 5%.

−$199.94M
1.66M sh @ $121
DVA
DAVITA INC.
Sell BERKSHIRE HATHAWAY INC · 10% Owner · Open-market sale · filed Oct 29, 2025 ΔOwn −1.2%

Berkshire Hathaway Inc sold $54.35M of DVA, trimming their stake 1%.

−$54.35M
401,514 sh @ $135
BRK.A
BERKSHIRE HATHAWAY INC
Sell Jain Ajit · Director, Vice Chairman · Open-market sale · filed Sep 26, 2025 ΔOwn −12%

Jain Ajit sold $0 of BRK.A, trimming their stake 12%.

−$0
15,000 sh
BRK.A
BERKSHIRE HATHAWAY INC
Sell Jain Ajit · Director, Vice Chairman · Open-market sale · filed Aug 8, 2025 ΔOwn −1.6%

Jain Ajit sold $929.5K of BRK.A, trimming their stake 2%.

−$929.5K
2,000 sh @ $465
SIRI
SIRIUS XM HOLDINGS INC.
Buy BERKSHIRE HATHAWAY INC · 10% Owner · Open-market purchase · filed Aug 4, 2025 ΔOwn +0.8%

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
SIRIUS XM HOLDINGS INC.
Buy BERKSHIRE HATHAWAY INC · 10% Owner · Open-market purchase · filed Aug 4, 2025 ΔOwn +1.6%

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
DAVITA INC.
Sell BERKSHIRE HATHAWAY INC · 10% Owner · Open-market sale · filed Aug 4, 2025 ΔOwn −4.8%

Berkshire Hathaway Inc sold $230.02M of DVA, trimming their stake 5%.

−$230.02M
1.64M sh @ $141
SIRI
SIRIUS XM HOLDINGS INC.
Buy BERKSHIRE HATHAWAY INC · 10% Owner · Open-market purchase · filed Aug 4, 2025 ΔOwn +1.7%

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
SIRIUS XM HOLDINGS INC.
Buy BERKSHIRE HATHAWAY INC · 10% Owner · Open-market purchase · filed Aug 4, 2025 ΔOwn +0.1%

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
VERISIGN INC/CA
Sell BERKSHIRE HATHAWAY INC · 10% Owner · Open-market sale · filed Aug 1, 2025 ΔOwn −32%

Berkshire Hathaway Inc sold $1.21B of VRSN, trimming their stake 32%.

−$1.21B
4.3M sh @ $282
DVA
DAVITA INC.
Sell BERKSHIRE HATHAWAY INC · 10% Owner · Open-market sale · filed May 27, 2025 ΔOwn −0.1%

Berkshire Hathaway Inc sold $2.68M of DVA.

−$2.68M
19,330 sh @ $139
DVA
DAVITA INC.
Sell BERKSHIRE HATHAWAY INC · 10% Owner · Open-market sale · filed May 27, 2025 ΔOwn −0.2%

Berkshire Hathaway Inc sold $10.04M of DVA.

−$10.04M
71,966 sh @ $140
DVA
DAVITA INC.
Sell BERKSHIRE HATHAWAY INC · 10% Owner · Open-market sale · filed May 27, 2025

Berkshire Hathaway Inc sold $1.68M of DVA.

−$1.68M
11,978 sh @ $140
DVA
DAVITA INC.
Sell BERKSHIRE HATHAWAY INC · 10% Owner · Open-market sale · filed May 27, 2025 ΔOwn −0.1%

Berkshire Hathaway Inc sold $3.73M of DVA.

−$3.73M
27,172 sh @ $137
DVA
DAVITA INC.
Sell BERKSHIRE HATHAWAY INC · 10% Owner · Open-market sale · filed May 27, 2025 ΔOwn −0.1%

Berkshire Hathaway Inc sold $4.99M of DVA.

−$4.99M
36,094 sh @ $138
DVA
DAVITA INC.
Sell BERKSHIRE HATHAWAY INC · 10% Owner · Open-market sale · filed May 27, 2025

Berkshire Hathaway Inc sold $110.9K of DVA.

−$110.9K
800 sh @ $139
DVA
DAVITA INC.
Sell BERKSHIRE HATHAWAY INC · 10% Owner · Open-market sale · filed May 27, 2025 ΔOwn −0.1%

Berkshire Hathaway Inc sold $4.36M of DVA.

−$4.36M
31,404 sh @ $139
DVA
DAVITA INC.
Sell BERKSHIRE HATHAWAY INC · 10% Owner · Open-market sale · filed May 27, 2025

Berkshire Hathaway Inc sold $175.7K of DVA.

−$175.7K
1,256 sh @ $140
DVA
DAVITA INC.
Sell BERKSHIRE HATHAWAY INC · 10% Owner · Open-market sale · filed May 12, 2025 ΔOwn −3.3%

Berkshire Hathaway Inc sold $168.58M of DVA, trimming their stake 3%.

−$168.58M
1.15M sh @ $147

About BRK-B insider activity

This page tracks every recent Form 4 filed for BERKSHIRE HATHAWAY INC with the U.S. Securities and Exchange Commission. Form 4 is the disclosure that company insiders — officers, directors, and holders of more than 10% of the stock — must file within two business days of buying or selling shares.

The summary above nets open-market purchases against open-market sales over the trailing 90 days. Open-market trades (codes P and S) tend to carry the most signal because they reflect a deliberate choice to put money in or take it out, as opposed to routine grants, option exercises, or tax-withholding events. Use the badges on each row to tell them apart, and always confirm details against the original filing before drawing conclusions.

Frequently asked questions

How often is BRK-B insider data updated?

Continuously. We read from SEC EDGAR, so new Form 4 filings for BERKSHIRE HATHAWAY INC usually appear here within minutes of being accepted by the SEC.

What does "net insider flow" mean?

It is the total dollar value of open-market insider purchases minus open-market sales over the last 90 days. A positive number (green) means insiders bought more than they sold; a negative number (red) means the reverse.

Why do some rows show grants or option exercises instead of buys?

Insiders receive stock through compensation as well as buying it outright. Form 4 captures all of these. We label each transaction by its SEC code so you can focus on open-market activity if you prefer.

Is this investment advice?

No. InsiderSource presents public filing data for informational purposes only. Insider activity is one of many factors to consider and is never a recommendation to buy or sell.