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Global Self Storage, Inc.

SELF
Exchange
Nasdaq
Industry
Real Estate Investment Trusts
SEC CIK
0001031235

In the last 90 days, Global Self Storage, Inc. insiders filed 8 open-market purchases and 0 sales; 51 institutions reported holding it in 13F filings for Q2 2026, worth $17.5M in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by Global Self Storage, Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
8 filings
3 insiders, $465.8K in total
Open-market sells
0 filings
Insiders trading
3
Net value
+$465.8K
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Global Self Storage, Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for Global Self Storage, Inc.
NameTitleLast reported holdingLast filingFilings, past year
Winmill Mark CampbellPresident and CEO372,582Sep 11, 20264
Winmill & Co. IncOther: See "Explanation of Responses"228,512Aug 26, 202613
Burke Russell E IIIDirector40,002Aug 14, 20265
Zachary William ChesterDirector18,296Aug 13, 20264
OMalley ThomasChief Financial Officer91,694Mar 25, 20261
Kamerman RussellAssistant General Counsel5,925Mar 25, 20261
Klimoski Donald IIGeneral Counsel97,554Mar 25, 20262
Carroll Sally CoonradDirector3,776May 22, 20250
Tuxis CorpOther: See "Explanation of Responses"303,758May 19, 20250
Langa George BDirector3,547Nov 29, 20220

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Sep 11, 2026 (view filing)4:29 PM ETSep 9-102 daysWinmill Mark CampbellPresident and CEOPPurchase+4.00K$5.16+$20.6K+1.1%372.6K after4 lots
Aug 26, 2026 (view filing)4:47 PM ETAug 25-261 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+15.3K$5.65+$86.5K+7.2%228.5K after2 lots
Aug 24, 2026 (view filing)4:03 PM ETAug 21-243 daysWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+15.1K$5.54+$83.9K+7.6%213.2K after2 lots
Aug 20, 2026 (view filing)4:32 PM ETAug 19-201 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+13.8K$5.41+$74.6K+7.5%198.1K after2 lots
Aug 18, 2026 (view filing)4:16 PM ETAug 17-181 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+12.9K$5.33+$68.4K+7.5%184.3K after2 lots
Aug 14, 2026 (view filing)4:20 PM ETAug 131 dayBurke Russell E IIIDirectorPPurchase+1.63K$5.21+$8.46K+4.2%40.0K after
Aug 14, 2026 (view filing)4:19 PM ETAug 13-141 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+11.7K$5.21+$60.8K+7.3%171.4K after2 lots
Aug 12, 2026 (view filing)4:52 PM ETAug 11-121 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+12.1K$5.16+$62.6K+8.2%159.8K after2 lots
May 15, 2026 (view filing)May 141 dayWinmill Mark CampbellPresident and CEOPPurchase+4.00K$5.33+$21.3K+1.1%368.6K after
Dec 5, 2025 (view filing)Dec 3-52 daysWinmill Mark CampbellPresident and CEOPPurchase+16.4K$5.12+$84.0K+5.1%339.2K after4 lots
Dec 2, 2025 (view filing)Dec 2Same dayKlimoski Donald IIGeneral CounselPPurchase+446$5.05+$2.25K+0.5%86.5K after
Dec 1, 2025 (view filing)Nov 28-Dec 13 daysWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+6.40K$5.17+$33.1K+4.5%147.6K after2 lots
Nov 26, 2025 (view filing)Nov 25-261 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+9.42K$5.17+$48.7K+7.1%141.2K after2 lots
Nov 24, 2025 (view filing)Nov 21-243 daysWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+10.3K$5.11+$52.6K+8.5%131.8K after2 lots
Nov 20, 2025 (view filing)Nov 19-201 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+12.1K$5.11+$61.8K+11.1%121.5K after2 lots
Nov 18, 2025 (view filing)Nov 17-181 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+11.8K$5.14+$60.9K+12.1%109.4K after2 lots
Nov 14, 2025 (view filing)Nov 13-141 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+13.7K$5.06+$69.5K+16.4%97.6K after2 lots
Nov 12, 2025 (view filing)Nov 11-121 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+8.12K$5.01+$40.7K+10.7%83.9K after2 lots
Aug 29, 2025 (view filing)Aug 29Same dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+4.59K$5.48+$25.2K+6.5%75.7K after
Aug 28, 2025 (view filing)Aug 27-281 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+12.7K$5.39+$68.4K+21.7%71.1K after2 lots
Aug 26, 2025 (view filing)Aug 251 dayBurke Russell E IIIDirectorPPurchase+105$5.25+$551.25+0.3%35.1K after
Aug 26, 2025 (view filing)Aug 25-261 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+15.6K$5.24+$81.8K+36.4%58.5K after2 lots
Aug 22, 2025 (view filing)Aug 21-221 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+2.66K$5.14+$13.7K+6.6%42.8K after2 lots
May 22, 2025 (view filing)May 211 dayCarroll Sally CoonradDirectorPPurchase+1.78K$5.63+$10.0K+88.8%3.78K after
May 20, 2025 (view filing)May 191 dayWinmill Mark CampbellPresident and CEOPPurchase+10.0K$5.67+$56.7K+3.2%322.8K after
May 19, 2025 (view filing)May 15-164 daysTuxis CorpOther: See "Explanation of Responses"PPurchase+19.3K$5.21+$100.5K+6.8%303.8K after2 lots
Nov 22, 2024 (view filing)Nov 211 dayBurke Russell E IIIDirectorPPurchase+168$5.26+$883.68+0.5%32.0K after
Aug 30, 2024 (view filing)Aug 29-301 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+2.64K$5.22+$13.7K+7.0%40.2K after2 lots
Aug 27, 2024 (view filing)Aug 26-271 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+4.73K$5.18+$24.5K+14.4%37.5K after3 lots
Aug 23, 2024 (view filing)Aug 22-231 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+8.71K$5.20+$45.3K+36.1%32.8K after2 lots
Aug 21, 2024 (view filing)Aug 20-211 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+7.33K$5.10+$37.4K+43.7%24.1K after2 lots
Aug 19, 2024 (view filing)Aug 16-193 daysWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+7.50K$5.05+$37.9K+80.7%16.8K after2 lots
Aug 15, 2024 (view filing)Aug 14-151 dayWinmill & Co. IncOther: See "Explanation of Responses"PPurchase+4.20K$4.97+$20.9K+82.6%9.29K after2 lots
May 31, 2024 (view filing)May 301 dayBurke Russell E IIIDirectorPPurchase+203$4.98+$1.01K+0.7%29.0K after
May 30, 2024 (view filing)May 28-302 daysWinmill Mark CampbellPresident and CEOPPurchase+22.9K$4.96+$113.6K+8.7%287.5K after5 lots
May 24, 2024 (view filing)May 24Same dayKlimoski Donald IIGeneral CounselPPurchase+539$4.91+$2.65K+0.7%75.0K after2 lots
Dec 1, 2023 (view filing)Nov 29-302 daysTuxis CorpOther: See "Explanation of Responses"SSale−15.0K$4.60−$69.0K−5.0%284.5K after2 lots
Nov 17, 2023 (view filing)Nov 161 dayWinmill Mark CampbellPresident and CEOPPurchase+7.20K$4.83+$34.8K+3.5%210.4K after6 lots
Nov 17, 2023 (view filing)Nov 17Same dayKlimoski Donald IIGeneral CounselPPurchase+1.00K$4.80+$4.80K+2.0%51.0K after
Aug 18, 2023 (view filing)Aug 171 dayCarroll Sally CoonradDirectorPPurchase+2.00K$5.07+$10.1KNew position2.00K after
Aug 18, 2023 (view filing)Aug 171 dayWinmill Mark CampbellPresident and CEOPPurchase+1.00K$5.07+$5.07K+0.5%203.2K after
May 16, 2023 (view filing)May 151 dayWinmill Mark CampbellPresident and CEOPPurchase+7.80K$5.12+$39.9K+4.0%202.2K after8 lots
May 15, 2023 (view filing)May 12-153 daysKlimoski Donald IIGeneral CounselPPurchase+560$5.08+$2.84K+1.1%50.0K after2 lots
Nov 29, 2022 (view filing)Nov 281 dayLanga George BDirectorPPurchase+1.98K$5.11+$10.1K+125.6%3.55K after16 lots
Nov 21, 2022 (view filing)Nov 183 daysWinmill Mark CampbellPresident and CEOPPurchase+3.00K$5.18+$15.5K+1.7%179.6K after4 lots
Nov 17, 2022 (view filing)Nov 16-171 dayKlimoski Donald IIGeneral CounselPPurchase+148$5.25+$777+0.3%43.0K after3 lots
Aug 24, 2022 (view filing)Aug 231 dayWinmill Mark CampbellPresident and CEOPPurchase+4.80K$6.07+$29.1K+2.8%176.6K after4 lots
May 23, 2022 (view filing)May 203 daysWinmill Mark CampbellPresident and CEOPPurchase+1.70K$5.74+$9.76K+1.0%171.8K after
Aug 31, 2021 (view filing)Aug 301 dayBurke Russell E IIIDirectorPPurchase+1.80K$5.30+$9.54K+8.4%23.3K after
Aug 25, 2021 (view filing)Aug 241 dayWinmill Mark CampbellPresident and CEOPPurchase+1.00K$5.12+$5.12K+0.6%162.1K after