13F Timing Lab / UNH · Q2 2025
Berkshire Hathaway
& UnitedHealth.
Berkshire’s August 2025 filing reported UnitedHealth common shares. The Thursday after-close disclosure and Friday closing-price entry let you examine what waiting changed over a fixed observation window.
Explore the record
Change the timing. See the difference.
Reviewed filing
Berkshire Hathaway → UNH
Berkshire Hathaway · Q2 2025
Read the dates before the headline
The holding came first. Your entry comes later.
45 days between the portfolio snapshot and the filing. Calendar days, not trading sessions.
- The portfolio snapshotJun 30, 2025Shares held on this date. It is not the purchase date.
- SEC accepts the filingAug 14, 202516:05:02 Eastern
After market close - Your selected entryAug 15, 2025Next trading session’s close
UNH at $304.01 - The common exitNov 10, 202560 sessions after the base entry.
60 sessions held in this replay.
We do not know the manager’s purchase date or price. Changing your entry moves only your replay; the exit stays fixed. Timeline steps are equally spaced, not a time scale.
Entry: Aug 15, 2025 at $304.01. Exit: Nov 10, 2025 at $321.58. 60 trading sessions between closes.
Same stock. Same exit. Different entry.
The exit stays Nov 10, 2025. Waiting shortens the holding period. “pp” means percentage points; this is a price comparison, not risk-adjusted alpha.
Scroll sideways to compare every column ↔
| Entry timing | Entry date | UNH | SPY | Difference |
|---|---|---|---|---|
| First session | Aug 15, 2025 | +5.78% | +5.91% | -0.13 pp |
| Wait 1 session | Aug 18, 2025 | +4.24% | +5.93% | -1.69 pp |
| Wait 5 sessions | Aug 22, 2025 | +4.61% | +5.60% | -0.99 pp |
Inspect the daily prices behind this chart
| Date | UNH | SPY |
|---|---|---|
| Aug 15, 2025 | $304.01 | $643.44 |
| Aug 18, 2025 | $308.49 | $643.30 |
| Aug 19, 2025 | $304.24 | $639.81 |
| Aug 20, 2025 | $299.84 | $638.11 |
| Aug 21, 2025 | $303.35 | $635.55 |
| Aug 22, 2025 | $307.42 | $645.31 |
| Aug 25, 2025 | $304.86 | $642.47 |
| Aug 26, 2025 | $300.43 | $645.16 |
| Aug 27, 2025 | $303.88 | $646.63 |
| Aug 28, 2025 | $302.29 | $648.92 |
| Aug 29, 2025 | $309.87 | $645.05 |
| Sep 2, 2025 | $308.80 | $640.27 |
| Sep 3, 2025 | $307.88 | $643.74 |
| Sep 4, 2025 | $310.38 | $649.12 |
| Sep 5, 2025 | $315.39 | $647.24 |
| Sep 8, 2025 | $320.25 | $648.83 |
| Sep 9, 2025 | $347.92 | $650.33 |
| Sep 10, 2025 | $346.78 | $652.21 |
| Sep 11, 2025 | $353.61 | $657.63 |
| Sep 12, 2025 | $352.51 | $657.41 |
| Sep 15, 2025 | $347.89 | $660.91 |
| Sep 16, 2025 | $339.78 | $660.00 |
| Sep 17, 2025 | $341.61 | $659.18 |
| Sep 18, 2025 | $334.82 | $662.26 |
| Sep 19, 2025 | $336.69 | $663.70 |
| Sep 22, 2025 | $341.30 | $666.84 |
| Sep 23, 2025 | $347.69 | $663.21 |
| Sep 24, 2025 | $351.81 | $661.10 |
| Sep 25, 2025 | $345.56 | $658.05 |
| Sep 26, 2025 | $344.08 | $661.82 |
| Sep 29, 2025 | $345.18 | $663.68 |
| Sep 30, 2025 | $345.30 | $666.18 |
| Oct 1, 2025 | $348.30 | $668.45 |
| Oct 2, 2025 | $353.72 | $669.22 |
| Oct 3, 2025 | $360.20 | $669.21 |
| Oct 6, 2025 | $358.77 | $671.61 |
| Oct 7, 2025 | $363.66 | $669.12 |
| Oct 8, 2025 | $369.92 | $673.11 |
| Oct 9, 2025 | $367.69 | $671.16 |
| Oct 10, 2025 | $354.50 | $653.02 |
| Oct 13, 2025 | $358.66 | $663.04 |
| Oct 14, 2025 | $359.93 | $662.23 |
| Oct 15, 2025 | $361.15 | $665.17 |
| Oct 16, 2025 | $356.67 | $660.64 |
| Oct 17, 2025 | $356.60 | $664.39 |
| Oct 20, 2025 | $364.48 | $671.30 |
| Oct 21, 2025 | $365.37 | $671.29 |
| Oct 22, 2025 | $361.49 | $667.80 |
| Oct 23, 2025 | $360.45 | $671.76 |
| Oct 24, 2025 | $362.50 | $677.25 |
| Oct 27, 2025 | $365.98 | $685.24 |
| Oct 28, 2025 | $367.84 | $687.06 |
| Oct 29, 2025 | $355.26 | $687.39 |
| Oct 30, 2025 | $344.75 | $679.83 |
| Oct 31, 2025 | $341.56 | $682.06 |
| Nov 3, 2025 | $333.79 | $683.34 |
| Nov 4, 2025 | $330.83 | $675.24 |
| Nov 5, 2025 | $327.74 | $677.58 |
| Nov 6, 2025 | $321.56 | $670.31 |
| Nov 7, 2025 | $324.21 | $670.97 |
| Nov 10, 2025 | $321.58 | $681.44 |
These selected historical cases are not a strategy test. Price movements can reflect earnings, market news and other events. These comparisons do not establish that the filing caused the move or that copying a manager works.
Filing facts / Q2 2025
The record behind the replay.
A new row is evidence of a reported holding, not evidence of the manager’s cost or motive. UnitedHealth-specific news and market moves remain competing explanations for the subsequent share-price path.
- Reported share quantity
- 5,039,564 shares
- Reported quarter-end value
- $1,572,192,781.00
- Security identifier
- 91324P102
Combined from 2 non-option rows for this security in this single filing. The original table reports values in USD. Value is a quarter-end mark, not purchase cost. Source rows retain their manager designations in the linked table.
No UNH CUSIP appears in the reviewed March original table or its August 14 new-holdings amendment. That amendment supplements the original; it does not replace it. Both were public before this replay’s first entry.
- SEC filing · 0000950123-25-008343 ↗
- SEC information table ↗
- Prior quarter original table ↗
- Prior quarter additional-holdings amendment ↗
- UNH historical market prices ↗ · SPY historical market prices ↗
SEC index acceptance: 2025-08-14 at 16:05:02 America/New_York. Historical review through Oct 24, 2026; this page does not monitor later amendments or current positions automatically.
How to read the numbers
A replay you can check.
01 / Start after the filing
The base entry is the next trading session’s close after the filing date, whether the filing arrived during trading or after the close. Scion’s Alibaba filing arrived during market hours; the other selected filings arrived after the close. It is a reproducible daily-price convention, not the earliest executable trade. Overnight and first-session moves are already in that entry price.
02 / Keep the exit fixed
Choose an exit 20 or 60 trading sessions after the base entry. Waiting one or five sessions moves the entry only. All scenarios exit on the same date; delayed entries therefore have shorter holding periods. Sessions follow the observed SPY trading dates, including holiday gaps.
03 / Compare like with like
Price change = (exit close ÷ entry close − 1) × 100. SPY uses the same dates. The difference is measured in percentage points, not risk-adjusted alpha. The chart rebases both series to 100 at the selected entry. Prices are USD closes from Yahoo Finance; the reviewed windows contain no recorded stock splits.
04 / Keep the limits visible
Dividends, trading costs, taxes and slippage are excluded. The snapshot-to-filing comparison is not the manager’s return. A weekend quarter-end uses the last trading close on or before that date. For an intraday filing, the filing-day close includes post-disclosure trading. Options, short positions and a manager’s actual trade dates are not reconstructed. These six selected cases cannot establish causation, predictive power or a profitable strategy.
Download all six cases’ prices (CSV) ↓ · Read the research · Report a correction
Reviewed snapshot · Oct 24, 2026 · Version 2026-10-24.1. Source retrieval and calculation checks are part of this release. No live prices or automatic refresh are implied.
Financial interest: the publisher/researcher has disclosed a GOOGL holding in Buteon’s Alphabet research. This collection includes GOOGL. Educational research, not an investment recommendation.