For information and research only. Not investment advice.
13F filings13F is partial
SoftBank
Masayoshi Son
Performance
Assuming an initial $100,000 · Benchmark: S&P 500
Hypothetical
Replication modeTop 5Top 10>1%
YTD1Y5Y8YAll
CompoundFixed
Gains are reinvested — principal and returns grow together.
Backtest through 2026-07-28
After filingAt quarter endBenchmark · S&P 500
After filing — buys the holdings only once the filing is public — about 45 days after the quarter ends. The path someone could actually have taken.
At quarter end — pretends the same holdings were bought on the last day of the quarter, before anyone could have known them. Not possible in reality — shown dashed for comparison only.
Benchmark — S&P 500 (SPY) total return over the same window — what doing nothing but holding the market would earn.
Hypothetical backtest — not a real trading record. Simulated on public data from 2020-08: each position is bought only after the filing became public (using no information unavailable at the time), with trading costs deducted, on a total-return basis. Past performance does not predict future results.
All metrics below are computed on the After-filing curve.
Return?
11.7%
Compound annual return over the sample.
Risk?
25.9%
How much returns swing (annualized stdev); lower is steadier.
Return vs risk?
0.56
Return ÷ volatility; higher is better.
Beat SPX?
−4.0%
Annualized gain over the S&P.
Excess?
+0.7%
The strategy's own annual excess, apart from the market.
Significance?
t=0.09 · very weak
t-value: how solid the excess is — higher is more reliable.
Max DD?
−32.0%
Largest peak-to-trough fall.
Leverage?
0.86×
How many times it rises and falls together with the market.
Longest recovery?
33 mo
Longest wait from a peak back to a new high.
About
Masayoshi Son
SoftBank Group, founded by Masayoshi Son, is known for the Vision Fund’s large bets on technology growth companies. Its 13F (via entities such as SB Northstar) is concentrated in a few US large-cap tech names and has at times carried heavy option positions — only a corner of its sprawling technology book. Investors interested in Son’s tech-allocation style can follow its filings over time.
Holdings & changes
Replication modeTop 5Top 10>1%
Current holdingsPosition changes
2026-Q1 filing · filed 2026-05-15
>1% · filed weights
Others 13.8%
Ticker
Name
Weight
vs last filing
INTC
Intel Corp
33.6%
+12.9 ▲
SYM
SYM
18.6%
+3.3 ▲
TMUS
T-Mobile US, Inc.
18.4%
−19.0 ▼
TSM
Taiwan Semiconductor Manufacturing Company Ltd.
5.9%
+2.0 ▲
XXI
XXI
5.0%
—
WBTN
WBTN
2.5%
—
TEM
Tempus AI, Inc. Class A Common Stock
2.1%
—
Risk
13F is partial — A tech-investment group centred on the Vision Fund’s private and growth bets; the 13F shows only a few US longs (and once large option notionals) — a corner of the empire.
The replication is built from public filings: ~45-day lag, US long stock positions only; replication returns are not the fund’s real returns, and the manager may have traded since.
Past / backtested performance does not predict the future. Masterfolio is an information service / publisher, not an investment adviser.