SELF Global Self Storage, Inc. Insider Trading

CEO Mark Campbell Winmill buys 4,000 shares of SELF at $5.33; holds 368,582 shares post-transaction

Mark Campbell Winmill, President and CEO, purchased 4,000 shares at $5.33 on 2026-05-14, adding to his substantial 368,582-share position. His prior five trades at SELF show a timing pattern of 4 wins at the 90-day mark, with positive returns of +0.2%, +1.0%, +0.2%, and +1.6% on those well-timed buys. The current stock price of $5.28 sits -10.4% from its 52-week high of $5.89 and is down 1.5% over the prior 30 days, while up 5.8% over 90 days. His cross-ticker track record across 17 prior buys shows a 90-day win rate of 90.00% with an average 90-day return of +1.5%, providing context for consistent execution at the broader portfolio level.

SELF CEO Mark Campbell buys 16,400 shares for $83,983.40 across 4 transactions (avg $5.12), 5.1% growth in holdings; cluster buy pattern detected

Mark Campbell, President and CEO, executed 4 separate purchases totaling 16,400 shares for $83,983.40 at prices ranging from $5.05 to $5.14 between December 3–5, 2025, increasing his holdings from 322,838 to 339,238 shares (+5.1%). The purchases occurred near the company's 52-week high of $5.76 (current price $4.99 is -13.4% below that peak). Notably, Campbell's prior trades at SELF have demonstrated a 4-of-5 pattern of well-timed buys, with 90-day returns averaging +4.3–+4.9% on three of his May 2024 purchases and 2025 activity tracking recent weakness. The filing reveals a cluster buy pattern with two other insiders acquiring shares within the same 14-day window. Against this backdrop, his blended transaction price of $5.12 sits above the current market level, offering a factual data point on entry valuation but without forward-looking timing commentary.

Global Counsel Klimoski purchases 446 shares of SELF at $5.05 as holdings grow to 86.5K shares post-transaction

Klimoski, the General Counsel, purchased 446 shares at $5.05, a modest $2.3K transaction that increased his holdings to 86,500 shares (+0.5% vs pre-transaction). The stock currently trades at $5.03, just below the purchase price and 12.7% below its 52-week high of $5.76. Klimoski's prior same-ticker purchases at SELF (on 2024-05-24 and 2023-11-17) showed positive 90-day returns of 6.8% and 5.8%, suggesting a historical pattern of well-timed accumulation at this company. His cross-ticker track record across all open-market buys shows a 100% 90-day win rate with an average 90-day return of +6.3%, though the present transaction is small in absolute size ($2.3K), limiting its signaling weight relative to the company's $57.0M market cap.

WINMILL & CO. INC accumulates 6,404 shares in SELF across 2 purchases (blended avg $5.17); holdings now 147,641 shares (+4.5%)

WINMILL & CO. INC executed 2 separate purchases totaling 6,404 shares for $33,081.88 at a blended average price of $5.17, growing its position from 141,237 to 147,641 shares. The current price ($5.15) sits near the transaction prices and remains -10.6% from the 52-week high of $5.76, offering no valuation backdrop of distress. However, the insider's cross-ticker track record reveals a 0.00% 90-day win rate on prior buys with an average 90d return of -3.8%, indicating a historical pattern of purchases preceding price declines. At Global Self Storage specifically, the insider has executed 5 prior trades within a 7-day window (2025-11-20 through 2025-11-26), all buys, yet none have reached measurable outcome windows. The rapid sequential accumulation in a micro-cap stock (market cap $58.4M, P/E 32.19) combined with poor cross-ticker timing history warrants monitoring for whether this consolidation reflects fundamental conviction or coincides with subsequent weakness.

WINMILL & CO. INC purchases 9,420 shares of SELF at blended $5.17 across 2 transactions; holdings rise to 141,237 shares.

WINMILL & CO. INC executed two separate purchases totaling 9,420 shares for $48,741.54 at an average price of $5.17, lifting its stake in Global Self Storage to 141,237 shares—a 7.1% increase in holdings. The current market price of $5.08 sits just 0.9% below the blended transaction price, and the insider's cross-ticker track record of 20 prior buys has averaged a -3.6% 30-day return and -2.5% 90-day return with a 0% win rate, raising questions about timing acuity. At SELF specifically, this filing is part of a five-trade buying sequence initiated on 2025-11-18, with outcomes not yet measurable; none of the insider's prior buys at any ticker demonstrated well-timed entry at the 90-day mark. Investors should note the repeated purchases near the 52-week low of $4.80 relative to the $5.76 high, combined with weak fundamentals (P/E of 31.75, quarterly net income of $496,259.00 against a market cap of $57,595,617.60, and modest annual revenue growth of 2.8%).

WINMILL & CO. INC buys 10,290 shares at $5.11 blended avg across 2 trades at SELF; now holds 131.8K shares (+8.5%).

WINMILL & CO. INC. made 2 separate purchases totaling 10,290 shares for $52,576.91 on November 21 and 24, 2025, at prices of $5.09 and $5.14 respectively, increasing holdings by 8.5% to 131.8K shares. The stock is currently trading at $5.11, within its 52-week range of $4.80–$5.76 and down 11.3% from the 52-week high, though up 2.2% over the past 30 days. However, the insider's cross-ticker track record shows weak execution: 20 prior buys have averaged -2.8% 30-day returns and -1.0% 90-day returns with only a 25.00% win rate, suggesting this insider's timing has not been reliable. At SELF specifically, the insider completed 5 prior trades (all buys) within the past week, all of which are too recent to measure outcome, and historical timing at this ticker shows 0 of 0 well-timed executions measurable to date. The underlying company shows modest fundamentals with $3.2M quarterly revenue, +2.8% annual growth, and a P/E of 31.94, which offers limited context for assessing valuation.

WINMILL & CO. accumulates 12,096 SELF shares across 2 transactions for $61,811.80, raising stake to 121,527 shares (+11.1%)

WINMILL & CO. executed 2 separate purchases totaling 12,096 shares for $61,811.80 at a blended average price of $5.11, increasing its holdings from 109,431 to 121,527 shares. This represents an 11.1% increase in the insider's position at Global Self Storage. The purchases occurred at prices near the current market level of $5.04, which is -12.5% from the 52-week high of $5.76, placing the stock in the lower half of its annual range. Notably, WINMILL & CO. has made 5 prior purchases at SELF within the past week (2025-11-12 through 2025-11-18), establishing a pattern of consecutive accumulation in this security. The insider's cross-ticker track record shows mixed timing outcomes (50.00% 90-day win rate on 20 prior buys, avg 90d return -0.0%), so the continued accumulation should be evaluated against the company's fundamentals—which show modest annual revenue growth of +2.8% and a P/E of 31.50—rather than on timing predictiveness alone.

WINMILL & CO. INC bought 11,844 shares at $5.14 avg (Nov 17-18); holds 109.4K shares post-trade

WINMILL & CO. INC executed 2 separate purchases totaling 11,844 shares for $60,882.28 on November 17-18, raising its stake in Global Self Storage by 12.1% to 109,431 shares. The purchases occurred at $5.12 and $5.16, close to the current price of $5.16 and within the 52-week range of $4.80–$5.76. The insider's prior trades at SELF show 4 very recent acquisitions (Nov 11-14) with outcomes not yet measurable, followed by an Aug 29 buy that returned -7.6% over 30 days; across all tickers, the insider's 20 prior buys have posted a 75.00% 90-day win rate but with a blended 90-day return of +0.7%. The stock's 30-day change of +3.9% suggests modest recent momentum, and the company's P/E of 32.25 is elevated relative to its $3.2M quarterly revenue and $496.3K net income. The intensifying purchase pattern over the past week, coupled with modest valuation and thin profitability relative to market cap, represents routine insider accumulation without clear catalysts or timing signals.

WINMILL & CO. INC bought 13,729 shares at blended $5.06 (Nov 13–14), raising stake to 97.6K shares (+16.4%)

WINMILL & CO. INC executed 2 separate purchases totaling 13,729 shares for $69,483.78 at an average price of $5.06 over November 13–14, increasing holdings from 83.9K to 97.6K shares. The current price of $5.08 is 11.8% below the 52-week high and the purchase occurred within a modest 30-day uptrend (+3.0%). Across WINMILL's cross-ticker track record of 20 prior buys, the average 90-day return is +0.7% with an 80% win rate, though this is not a direct predictor of outcome at SELF. At SELF specifically, WINMILL's 5 prior trades show mixed near-term results (three August buys delivered negative 30-day returns ranging from -5.6% to -7.6%), and no measurable 90-day outcomes yet exist for any trade at this ticker. The ongoing accumulation pattern—3 buys in 3 days (Aug 27–29 and Nov 11–14)—warrants observation as SELF trades at a P/E of 31.75 on modest fundamentals ($3.2M quarterly revenue, $496.3K net income).

Winmill & Co. buys 8,124 shares of SELF at blended $5.01; holding now 83.9K shares (+10.7%)

Winmill & Co. Inc made 2 separate purchases totaling 8,124 shares for $40,721.01 on November 11–12, 2025, increasing holdings by 10.7% to 83.9K shares post-transaction. The blended average price of $5.01 sits near the current price of $5.05 and within the 52-week range, indicating a neutral entry point rather than a contrarian move. However, the insider's prior 5 trades at SELF—all buys in late August 2025—each showed negative 30-day returns (-7.6% to -3.8%), and the timing pattern at this ticker shows 0 of 0 prior buys well-timed at the 90-day mark, suggesting recent purchases have underperformed. While the cross-ticker track record shows a positive 90-day win rate of 83.33%, the same-ticker history at SELF does not yet reflect a 90-day outcome for any of the five prior trades, leaving no measured validation of transaction selection at this specific issuer.