BRK-B, Sep 30, 2026 · Trading desk

Paper trading, not investment advice. Every account and book on these pages trades paper money: the Alpaca paper accounts DAILY ($1,000,000 from Sep 30, 2026), INTRA1 ($100,000 from Sep 30, 2026) and INTRA2 ($100,000 from Sep 30, 2026); the simulated books SIM-TT ($100,000 from Sep 29, 2026), SIM-V2B ($100,000 from Sep 28, 2026) and SIM-V2B-TOM ($100,000 from Sep 28, 2026), filled at the official close; and market-analysis's ledgers, one contract per position against a $100,000 reporting equity. No real money is at stake. Positions, trades and P&L are published the same day, as the engines record them, with each number's source and cost model labelled. Nothing here is a recommendation to buy, sell or hold any security, and nothing is tailored to you. Each strategy is a pre-registered experiment, read once on a date or at a trade count fixed in advance; until then its record says little either way. I may hold or have held positions in securities shown here. Markets can and do lose money.

Account: DAILY
Strategy: v2b on Alpaca paper
Book: v2b
Symbol: BRK-B
Asset class: equity
Side: long
Exposure: long
Status: closed
Opened: Sep 30, 2026
Closed: Oct 2, 2026
Quantity: 2
Entry price: 498.29
Exit price: 503.415
Exit by: close>sma_exit
Book value at entry: $100,000.00

Record Trade journal

Cost model

Alpaca paper fills, with no commission. In the DAILY account, shares one sub-book buys and another sells at the same close meet inside the account at the official close, and every leg on the larger side gets one average of that price and Alpaca's fill. Alpaca's SEC and CAT fees, charged by the day, are left out. Commission is estimated at $0.007 a share a side, the rate at the owner's own broker: the net P&L is the P&L less it, without dividends; the P&L, the total with dividends, the return and the P&L in basis points of the sub-book are before it. An open trade is marked at the latest official close, before commission, with the dividends paid so far beside it.

Entry value: $996.58
Exit value: $1,006.83
P&L: +$10.25
Dividends: $0.00
P&L with dividends: +$10.25
Costs: $0.03
Net P&L: +$10.22
Return: +1.03%
Of the book: +1.0 bp
R multiple: —
Held: 2 sessions

Role	Date	At (ET)	Side	Qty	Asked	Price	Rule's price	Close	Slippage	Against the close	How	Why	The rule's numbers
entry	Sep 30, 2026	—	buy	2	4	498.29	498.855011	497.950012	−11.3 bp	+6.8 bp	signal	entry rank 17 rsi 3.8	8 numbers time null sleeve pullback netting buys 8 sells 0 crossed 0 met_inside false under_price 0 account_order sent 8 side buy filled 4 status expired at_limit null at_market null avg_price 498.29 bp_vs_close 6.8277494654900295 orders_sent null snapshot_last_bar null final_close_agrees null
exit	Oct 2, 2026	15:57 ET	sell	2	2	503.415	503.410004	502.649994	−0.1 bp	−15.2 bp	signal	close>sma_exit	19 trigger numbers adv 2018478102.947998 rsi 75.22629416586992 close 503.4100036621094 spy_sma 717.0400286865234 exit_sma 5 sma_exit 501.4600036621094 tradable true raw_close 503.4100036621094 sma_trend 492.7699496459961 spy_close 769.7750244140625 trend_sma 200 candidates 20 core_is_on true free_slots 7 exit_signal true entry_signal false held_sessions 2 rsi_entry_below 10 max_hold_sessions 10 8 numbers time 15:57:39 sleeve pullback netting buys 0 sells 4 crossed 0 met_inside false under_price 0 account_order sent 4 side sell filled 4 status filled at_limit 4 at_market 0 avg_price 503.415 bp_vs_close −15.219459122746137 orders_sent 4 snapshot_last_bar 2026-10-02 15:40:36-04:00 final_close_agrees null

Span: 2 sessions
High: 503.619995 on Oct 2, 2026
Low: 495.959991 on Oct 1, 2026
Best point (MFE): +1.07%
Worst point (MAE): −0.47%
Bars from: public daily bars

v2b: RSI(2) pullback in S&P 500 stocks, and SPY while above its 200-day average

2026-09-30: bought 2 of 4; the rest dropped

BRK-B · v2b on Alpaca paper

The trade

Result

Entry and exit

Path while held

Notes