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KY

Yoshifumi Komatsu

Current role
Vice President, Technology · TeraWulf
Current holdings (from latest Form 3/4/5)
TeraWulf WULF: 2,742 shares ≈ $32.2K (5.5 bp of co.) (as of 2007-11-07)
Insider activity since 2004-03
Invested $85.7K (32,932 shares acquired)
↳ notional today: $386.3K
Divested $102.3K (14,466 shares sold)
↳ notional today: $169.7K
→ Net divested $16.6K
↳ net notional: ↑ $216.6K
Change since first tracked filing (not total holdings; see methodology). Prices as of 2026-10-30.

Vice President of Technology at the Company since September 1993. Prior to that, served as Director of Research and Development for two years. Over 15 years total tenure with the Company's Research and Development Department.

Prior experience includes positions in research and development at Alberta Gas Chemicals, a manufacturer of organic acids. Holds a B.S. in Chemistry and Mathematics from the College of Saint Scholastica (1980).

Biography extracted from TeraWulf DEF 14A filed 2007-03-23 View cached copy (2026-09-27)Live source ↗

Roles

Contiguous filings for the same role are collapsed into a single tenure span. Click a row to see the underlying filings.

CompanyRoleTenureFilings
TeraWulfVice President, Technology2004-03 → present (22y 8mo)5
Show 5 underlying filings
2007-11-07 · TeraWulf Form 4 filed 2007-11-08
View cached copy (2026-09-13)Live source ↗
2007-05-29 · TeraWulf Form 4 filed 2007-05-31
View cached copy (2026-09-13)Live source ↗
2005-11-03 · TeraWulf Form 4 filed 2005-11-07
View cached copy (2026-09-13)Live source ↗
2005-03-16 · TeraWulf Form 4 filed 2005-03-17
View cached copy (2026-09-13)Live source ↗
2004-03-09 · TeraWulf Form 4 filed 2004-03-11
View cached copy (2026-09-13)Live source ↗

Insider transactions

Totals for this person

BucketInvested (shares)Invested (USD)Divested (shares)Divested (USD)Net directionTxnsInvested @ last priceDivested @ last price
All time32,932$85.7K14,466$102.3K↓ Divested $16.6K26$386.3K$169.7K
200710,000$12.2K3,000$27.0K↓ Divested $14.8K5$117.3K$35.2K
200521,600$71.5K10,800$68.6K↑ Invested $2.9K18$253.4K$126.7K
20041,332$2.1K666$6.7K↓ Divested $4.6K3$15.6K$7.8K
2005-Q16,000$13.1K3,000$16.8K↓ Divested $3.7K4$70.4K$35.2K
2005-Q415,600$58.3K7,800$51.8K↑ Invested $6.5K14$183.0K$91.5K
2007-Q24,000$4.2K-$0↑ Invested $4.2K2$46.9K$0
2007-Q46,000$8.0K3,000$27.0K↓ Divested $19.0K3$70.4K$35.2K

Invested = shares acquired (buys, grants, option exercises) — insider adding to the position. Divested = shares reduced (sells, dispositions, tax-withholding) — cash flowing TO the insider. Net direction shows which side wins on dollar terms in each bucket. % of holder's stake not yet computed (pending Form 3/4 holdings ingest). See methodology. The two @ last price columns restate the same share counts at the most recent share price we read (close of 2026-10-30); they are a valuation, not a cash flow, and they move every day the market does.

All transactions

DateCompanyKindSharesAmount (USD)Value @ last price
2007-11-07TeraWulfOption / RSU exercise3,000$8,001$35.2K
2007-11-07TeraWulfOpen-market sale3,000$27,000$35.2K
2007-11-07TeraWulfOption / RSU exercise · Common Stock Option (right to buy)3,000-$35.2K
2007-05-29TeraWulfOption / RSU exercise2,000$4,167$23.5K
2007-05-29TeraWulfOption / RSU exercise · Common Stock Option (right to buy)2,000-$23.5K
2005-11-03TeraWulfOption / RSU exercise4,500$13,797$52.8K
2005-11-03TeraWulfOption / RSU exercise3,300$44,550$38.7K
2005-11-03TeraWulfOpen-market sale300$2,055$3.5K
2005-11-03TeraWulfOpen-market sale100$680$1.2K
2005-11-03TeraWulfOpen-market sale100$676$1.2K
2005-11-03TeraWulfOpen-market sale200$1,350$2.3K
2005-11-03TeraWulfOpen-market sale99$662$1.2K
2005-11-03TeraWulfOpen-market sale99$661$1.2K
2005-11-03TeraWulfOpen-market sale1,500$9,990$17.6K
2005-11-03TeraWulfOpen-market sale1,902$12,648$22.3K
2005-11-03TeraWulfOpen-market sale94$621$1.1K
2005-11-03TeraWulfOpen-market sale3,406$22,480$40.0K
2005-11-03TeraWulfOption / RSU exercise · Common Stock Option (right to buy)4,500-$52.8K
2005-11-03TeraWulfOption / RSU exercise · Common Stock Option (right to buy)3,300-$38.7K
2005-03-16TeraWulfOption / RSU exercise3,000$13,125$35.2K
Show older transactions (6 more)
DateCompanyKindSharesAmount (USD)Value @ last price
2005-03-16TeraWulfOpen-market sale2,245$12,572$26.3K
2005-03-16TeraWulfOpen-market sale755$4,220$8.9K
2005-03-16TeraWulfOption / RSU exercise · Common Stock Option (right to buy)3,000-$35.2K
2004-03-09TeraWulfOption / RSU exercise666$2,081$7.8K
2004-03-09TeraWulfOpen-market sale666$6,660$7.8K
2004-03-09TeraWulfOption / RSU exercise · Stock Option (right to buy)666-$7.8K