Investors / filer profile

Winmill Mark Campbell

President and CEO

active in 1 company · 0 of 1 positions beat the S&P ~6mo later

Pro
Bought: Pro
Sold: 8
Filings: 1
Companies: 2026-09-10
Last filed

EDGAR · CIK 0001019264 ↗

Track record

How each disclosed position did against the S&P ~6 months later

The outcome curve and every position's resultPro →

-1.0%

median move per position

+10.3%

S&P 500 median, same spans

0 of 1

beat the S&P ~6mo later

1 position still inside the ~6-month window — not scored yet.

Disclosed positions

Estimated from their latest filings — positions may have changed since

Estimated positions from their latest filingsPro →

Activity

Open-market buy & sell volume

BuySell

Total +$104.6K bought

All filings on record

Every Form 4 transaction we track for this filer


SELFGlobal Self Storage, Inc.	Buy $1.5K · 292 sh	2026-09-10	—
SELFGlobal Self Storage, Inc.	Buy $258.00 · 50 sh	2026-09-10	—
SELFGlobal Self Storage, Inc.	Buy $10.6K · 2,058 sh	2026-09-09	—
SELFGlobal Self Storage, Inc.	Buy $8.3K · 1,600 sh	2026-09-09	—
SELFGlobal Self Storage, Inc.	Buy $18.3K · 3,600 sh	2025-12-05	—
SELFGlobal Self Storage, Inc.	Buy $4.0K · 800 sh	2025-12-05	—
SELFGlobal Self Storage, Inc.	Buy $30.8K · 6,000 sh	2025-12-04	—
SELFGlobal Self Storage, Inc.	Buy $30.8K · 6,000 sh	2025-12-03	—

SELFBuy

2026-09-10 · Global Self Storage, Inc.

$1.5K

—

SELFBuy

2026-09-10 · Global Self Storage, Inc.

$258.00

—

SELFBuy

2026-09-09 · Global Self Storage, Inc.

$10.6K

—

SELFBuy

2026-09-09 · Global Self Storage, Inc.

$8.3K

—

SELFBuy

2025-12-05 · Global Self Storage, Inc.

$18.3K

—

SELFBuy

2025-12-05 · Global Self Storage, Inc.

$4.0K

—

SELFBuy

2025-12-04 · Global Self Storage, Inc.

$30.8K

—

SELFBuy

2025-12-03 · Global Self Storage, Inc.

$30.8K

—

8 filingsEvery Form 4 on record, with outcomesPro →

Outcomes measure each position — the first buy in a stock and every buy within 182 days — against the closing price ~6 months (120 trading days) later, with the S&P 500 over the same span for context. Pre-scheduled 10b5-1 plan trades are excluded from the record. Positions are estimated from the latest reported post-transaction holdings, split-adjusted, at the latest close. Built from SEC Form 4 filings and market prices — past outcomes, not predictions or advice.