JSA Model Portfolio · Hypothetical · Educational only

Japan Stock Alpha Portfolio

A hypothetical ¥10 million portfolio originally invested across 10 Japanese stocks on 6 January 2025. On 12 June 2026, Tokio Marine and Furukawa Co. were exited and the after-tax proceeds were redeployed into Kioxia.

Started 6 Jan 2025 · Originally equal-weight · Rebalanced 12 Jun 2026
Transaction prices use the 12 June 2026 closing prices. Educational only — not real money, not advice.

Current Portfolio Value

¥21,620,130

¥11,641,030 (+116.7%)

Started ¥9,979,100 · 6 Jan 2025

Last successfully updated: 12 June 2026 close

12 Jun 2026 close snapshot · checking for fresher delayed prices

All (9)

Sogo Shosha (2)

Semiconductors & Materials (5)

Defense (2)

Total Return

+116.7%

Jan 2025 → Present

Best Performer

JX +295.2%

5016.T

vs Nikkei 225

+66pp

Estimated alpha

Holdings in Profit

9 / 9

All current positions non-negative

Portfolio Rebalance

Tokio Marine + Furukawa Co. → Kioxia

Both legacy positions were sold at the Friday close. Estimated Japanese tax was applied only to the realized gains, and the remaining proceeds were used to purchase whole shares of Kioxia at the same closing price.

12 Jun 2026 close

Sold

Tokio Marine

178 shares × ¥7,325 = ¥1,303,850

Sold

Furukawa Co.

622 shares × ¥3,725 = ¥2,316,950

Estimated Tax

¥329,355

20.315% × realized gain of ¥1,621,242

Bought

Kioxia · 40 shares

¥81,200 per share · ¥3,248,000 deployed

Residual Cash

¥43,445

Gross proceeds ¥3,620,800 · net after estimated tax ¥3,291,445

Tax assumption: standard Japanese taxable account, no NISA exemption, no loss offsets and no transaction fees. Actual tax treatment can differ by account and investor circumstances.

Portfolio Value — Jan 2025 to 12 Jun 2026

¥ millions · monthly indicative values · tax impact included

Indicative

9 Holdings + Cash

12 Jun 2026 close snapshot · prices refresh on load

8058.T Shosha

Mitsubishi Corp.

Largest trading house · LNG Canada · Diversified

¥4,683 (12 Jun close)

+86.9%

vs entry

+86.9%

Shares: 399

Value: ¥1,868,517

Read Deep Dive →

8002.T Shosha

Marubeni Corp.

Gavilon grain · Power IPP · Food security

¥4,899 (12 Jun close)

+106.1%

vs entry

+106.1%

Shares: 420

Value: ¥2,057,580

Read Deep Dive →

8035.T Semi

Tokyo Electron

WFE global leader · Coaters · AI chip fabs

¥68,000 (12 Jun close)

+182.5%

vs entry

+182.5%

Shares: 41

Value: ¥2,788,000

6857.T Semi

Advantest

AI chip testing · HBM memory test · #1 global

¥27,325 (12 Jun close)

+193.0%

vs entry

+193.0%

Shares: 107

Value: ¥2,923,775

4063.T Semi

Shin-Etsu Chemical

Silicon wafers · PVC · Semiconductor materials

¥7,188 (12 Jun close)

+30.9%

vs entry

+30.9%

Shares: 182

Value: ¥1,308,216

5016.T Materials

JX Advanced Metals

Sputtering targets 60% global share · AI chips

¥3,557 (12 Jun close)

+295.2%

vs entry

+295.2%

Shares: 1,111

Value: ¥3,951,827

7011.T Defense

Mitsubishi Heavy Ind.

Fighter aircraft · GCAP · Destroyers · Missiles

¥3,540 (12 Jun close)

+61.3%

vs entry

+61.3%

Shares: 455

Value: ¥1,610,700

7013.T Defense

IHI Corporation

Jet engines · F-15J · Next-gen fighter engines

¥2,430 (12 Jun close)

+82.2%

vs entry

+82.2%

Shares: 749

Value: ¥1,820,070

285A.T Semi Added 12 Jun

Kioxia Holdings

NAND flash · AI storage · Added in June 2026 rebalance

¥81,200 (12 Jun close)

+0.0%

vs entry

+0.0%

Shares: 40

Value: ¥3,248,000

Read Deep Dive →

Holdings Detail

Stock	Theme	Shares	Entry Date	Buy Price	Current	Cost	Value	Gain/(Loss)	Return
Mitsubishi Corp. 8058.T	Shosha	399	6 Jan 2025	¥2,505	¥4,683*	¥999,495	¥1,868,517	¥869,022	+86.9%
Marubeni Corp. 8002.T	Shosha	420	6 Jan 2025	¥2,377	¥4,899*	¥998,340	¥2,057,580	¥1,059,240	+106.1%
Tokyo Electron 8035.T	Semi	41	6 Jan 2025	¥24,070	¥68,000*	¥986,870	¥2,788,000	¥1,801,130	+182.5%
Advantest 6857.T	Semi	107	6 Jan 2025	¥9,325	¥27,325*	¥997,775	¥2,923,775	¥1,926,000	+193.0%
Shin-Etsu Chemical 4063.T	Semi	182	6 Jan 2025	¥5,493	¥7,188*	¥999,726	¥1,308,216	¥308,490	+30.9%
JX Advanced Metals 5016.T	Materials	1,111	19 Mar 2025	¥900	¥3,557*	¥999,900	¥3,951,827	¥2,951,927	+295.2%
Mitsubishi Heavy Ind. 7011.T	Defense	455	6 Jan 2025	¥2,194	¥3,540*	¥998,270	¥1,610,700	¥612,430	+61.3%
IHI Corporation 7013.T	Defense	749	6 Jan 2025	¥1,334	¥2,430*	¥999,166	¥1,820,070	¥820,904	+82.2%
Kioxia Holdings 285A.T Added 12 Jun	Semi	40	12 Jun 2026	¥81,200	¥81,200*	¥3,248,000	¥3,248,000	¥0	+0.0%
Residual Cash After June rebalance	Cash	—	12 Jun 2026	—	—	—	¥43,445	—	—
Portfolio Total						¥9,979,100	¥21,620,130	¥11,641,030	+116.7%

Methodology & Data Sources

Hypothetical paper portfolio. No real investments made. All prices are approximate.

Entry dates: Eight legacy positions were entered on 6 January 2025. JX Advanced Metals was added on its 19 March 2025 listing date. Kioxia was added on 12 June 2026 as part of the highlighted rebalance.
12 June 2026 rebalance: Sold 178 Tokio Marine shares at ¥7,325 and 622 Furukawa Co. shares at ¥3,725. Gross proceeds were ¥3,620,800.
Tax treatment: Estimated 20.315% Japanese tax applied to realized gains of ¥1,621,242, resulting in estimated tax of ¥329,355. This assumes a standard taxable account with no NISA exemption or loss offsets.
Kioxia purchase: Bought 40 shares at the 12 June 2026 close of ¥81,200. Residual cash is ¥43,445. Transaction fees are ignored.
Prices shown: Static fallback values use 12 June 2026 closing prices. On load, the page checks for fresher delayed market data; incomplete responses never replace the fallback snapshot.
Portfolio chart: Monthly indicative values. The latest point includes the estimated tax impact of the rebalance. Dividends are not included.

Hypothetical portfolio for educational purposes only. Not investment advice. Not real investments by Japan Stock Alpha or its authors. All figures are approximate estimates. Past performance does not indicate future results. For informational purposes only. This is not investment advice or a recommendation to buy, sell, or hold any security.