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Definium Therapeutics, Inc.

DFTX
Exchange
Nasdaq
Industry
Medicinal Chemicals & Botanical Products
SEC CIK
0001813814

In the last 90 days, Definium Therapeutics, Inc. insiders filed 0 open-market purchases and 1 sale; 361 institutions reported holding it in 13F filings for Q2 2026, worth $5.35B in total; Duquesne Family Office is the only superinvestor holding it.

Open-market trades, last 90 days

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

Open-market buys
0 filings
Open-market sells
1 filing
1 insider, $721.7K in total
Insiders trading
1
Net value
−$721.7K
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for Definium Therapeutics, 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 Definium Therapeutics, Inc.
NameTitleLast reported holdingLast filingFilings, past year
Vallone Carol ADirector22,296Sep 18, 20262
Krebs AndreasDirector21,402Sep 18, 20262
Karlin DanChief Medical Officer803,699Sep 14, 20267
Wiley Matthew T.Chief Commercial Officer362,133Sep 14, 20265
Sullivan MarkChief Legal Officer508,279Sep 14, 20267
Roberts BrandiChief Financial Officer397,905Sep 14, 20265
Barrow RobertChief Executive Officer2,244,640Sep 14, 20268
Gryska David WDirector19,900Jun 15, 20261
Bruhn Suzanne LouiseDirector24,289Jun 15, 20261
Crystal RogerDirector24,289Jun 15, 20261
Adsett RogerDirector3,555Jun 15, 20262
Liao CarrieChief Accounting Officer144,923Mar 26, 20250
Wernli Miri HalperinExecutive President202,405Aug 22, 20240
Greenway Schond L.Chief Financial Officer211,057Mar 26, 20240
Makes BrigidDirector158,706Jun 6, 20220
Hu Cynthia W.Chief Legal Officer&Secretary1,200,000Mar 28, 20220
Hurst Stephen LDirector, Other: Former Director–Mar 25, 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 4, 2026 (view filing)9:30 PM ETSep 31 dayBarrow RobertChief Executive OfficerSSale−19.0K$37.94−$721.7K−1.3%1.49M after10b5-1
Jun 26, 2026 (view filing)Jun 251 daySullivan MarkChief Legal OfficerSSale−13.0K$45.03−$585.8K−3.9%320.6K after10b5-1
Jun 26, 2026 (view filing)Jun 251 dayKarlin DanChief Medical OfficerSSale−10.0K$45.03−$451.9K−2.0%503.3K after10b5-1
Jun 26, 2026 (view filing)Jun 251 dayRoberts BrandiChief Financial OfficerSSale−3.01K$45.03−$135.7K−1.4%209.5K after10b5-1
Jun 26, 2026 (view filing)Jun 251 dayBarrow RobertChief Executive OfficerSSale−29.2K$45.03−$1.32M−2.6%1.10M after10b5-1
Jun 26, 2026 (view filing)Jun 251 dayWiley Matthew T.Chief Commercial OfficerSSale−2.87K$45.03−$129.1K−1.6%174.6K after10b5-1
Mar 26, 2026 (view filing)Mar 251 dayKarlin DanChief Medical OfficerSSale−8.02K$18.47−$148.1K−1.9%413.3K after10b5-1
Mar 26, 2026 (view filing)Mar 251 daySullivan MarkChief Legal OfficerSSale−10.7K$18.47−$197.7K−3.8%271.1K after10b5-1
Mar 26, 2026 (view filing)Mar 251 dayBarrow RobertChief Executive OfficerSSale−24.4K$18.47−$451.2K−3.1%752.5K after10b5-1
Dec 29, 2025 (view filing)Dec 263 daysKarlin DanChief Medical OfficerSSale−5.60K$13.15−$73.6K−1.3%425.0K after10b5-1
Dec 29, 2025 (view filing)Dec 263 daysBarrow RobertChief Executive OfficerSSale−25.8K$13.15−$339.2K−3.2%778.5K after10b5-1
Dec 29, 2025 (view filing)Dec 263 daysSullivan MarkChief Legal OfficerSSale−11.3K$13.15−$148.3K−3.8%282.6K after10b5-1
Sep 26, 2025 (view filing)Sep 251 daySullivan MarkChief Legal OfficerSSale−11.3K$9.77−$110.2K−3.7%293.9K after10b5-1
Sep 26, 2025 (view filing)Sep 251 dayBarrow RobertChief Executive OfficerSSale−25.8K$9.77−$252.0K−3.1%804.3K after10b5-1
Sep 26, 2025 (view filing)Sep 251 dayKarlin DanChief Medical OfficerSSale−7.70K$9.77−$75.3K−1.8%430.6K after10b5-1
Jun 26, 2025 (view filing)Jun 251 daySullivan MarkChief Legal OfficerSSale−11.5K$6.80−$78.1K−3.6%305.1K after10b5-1
Jun 26, 2025 (view filing)Jun 251 dayKarlin DanChief Medical OfficerSSale−7.85K$6.80−$53.4K−1.8%438.3K after10b5-1
Jun 26, 2025 (view filing)Jun 251 dayBarrow RobertChief Executive OfficerSSale−26.5K$6.80−$180.1K−3.1%830.1K after10b5-1
Mar 26, 2025 (view filing)Mar 251 dayBarrow RobertChief Executive OfficerSSale−21.2K$6.74−$142.9K−2.4%856.6K after10b5-1
Mar 26, 2025 (view filing)Mar 251 dayKarlin DanChief Medical OfficerSSale−6.84K$6.74−$46.1K−1.5%446.2K after10b5-1
Mar 26, 2025 (view filing)Mar 251 daySullivan MarkChief Legal OfficerSSale−6.58K$6.74−$44.3K−2.0%316.6K after10b5-1
Mar 26, 2025 (view filing)Mar 251 dayLiao CarrieChief Accounting OfficerSSale−2.35K$6.74−$15.8K−1.6%144.9K after10b5-1
Dec 27, 2024 (view filing)Dec 261 dayBarrow RobertChief Executive OfficerSSale−19.1K$7.43−$142.0K−3.5%526.7K after10b5-1
Dec 27, 2024 (view filing)Dec 261 dayLiao CarrieChief Accounting OfficerSSale−2.27K$7.43−$16.9K−2.3%97.3K after10b5-1
Dec 27, 2024 (view filing)Dec 261 dayKarlin DanChief Medical OfficerSSale−6.64K$7.43−$49.4K−1.9%338.0K after10b5-1
Dec 27, 2024 (view filing)Dec 261 daySullivan MarkChief Legal OfficerSSale−4.52K$7.43−$33.6K−2.5%173.2K after10b5-1
Dec 5, 2024 (view filing)Dec 5Same dayGryska David WDirectorPPurchase+2.50K$7.17+$17.9K+14.4%19.9K after
Sep 25, 2024 (view filing)Sep 25Same dayLiao CarrieChief Accounting OfficerSSale−2.35K$5.98−$14.1K−2.3%99.5K after10b5-1
Sep 25, 2024 (view filing)Sep 25Same dayBarrow RobertChief Executive OfficerSSale−19.8K$5.98−$118.2K−3.5%545.8K after10b5-1
Sep 25, 2024 (view filing)Sep 25Same dayKarlin DanChief Medical OfficerSSale−6.87K$5.98−$41.1K−2.0%344.7K after10b5-1
Sep 25, 2024 (view filing)Sep 25Same daySullivan MarkChief Legal OfficerSSale−4.43K$5.98−$26.5K−2.4%177.7K after10b5-1
Aug 26, 2024 (view filing)Aug 233 daysGryska David WDirectorPPurchase+3.50K$5.98+$20.9K+25.3%17.4K after
Aug 20, 2024 (view filing)Aug 19-201 dayBarrow RobertChief Executive OfficerPPurchase+1.00K$6.22+$6.21K+0.2%565.5K after2 lots
Jun 25, 2024 (view filing)Jun 25Same daySullivan MarkChief Legal OfficerSSale−17.9K$7.22−$128.9K−8.9%182.1K after10b5-1
Jun 25, 2024 (view filing)Jun 25Same dayKarlin DanChief Medical OfficerSSale−6.92K$7.22−$50.0K−1.9%351.5K after10b5-1
Jun 25, 2024 (view filing)Jun 25Same dayBarrow RobertChief Executive OfficerSSale−15.7K$7.22−$113.1K−2.7%564.5K after10b5-1
Mar 26, 2024 (view filing)Mar 251 dayKarlin DanChief Medical OfficerSSale−6.58K$9.50−$62.5K−1.8%358.5K after10b5-1
Mar 26, 2024 (view filing)Mar 251 dayBarrow RobertChief Executive OfficerSSale−16.5K$9.50−$156.9K−2.8%580.2K after10b5-1
Dec 26, 2023 (view filing)Dec 26Same dayKarlin DanChief Medical OfficerSSale−6.77K$3.63−$24.6K−1.8%365.0K after
Dec 26, 2023 (view filing)Dec 26Same dayBarrow RobertChief Executive OfficerSSale−13.2K$3.63−$48.1K−2.2%596.7K after
Dec 26, 2023 (view filing)Dec 26Same dayGreenway Schond L.Chief Financial OfficerSSale−5.65K$3.63−$20.5K−2.5%216.6K after
Sep 25, 2023 (view filing)Sep 25Same dayBarrow RobertChief Executive OfficerSSale−13.5K$3.58−$48.3K−2.2%611.7K after2 lots
Sep 25, 2023 (view filing)Sep 25Same dayKarlin DanChief Medical OfficerSSale−6.92K$3.57−$24.7K−1.8%371.8K after2 lots
Sep 25, 2023 (view filing)Sep 25Same dayGreenway Schond L.Chief Financial OfficerSSale−5.76K$3.58−$20.6K−2.5%222.3K after2 lots
Aug 28, 2023 (view filing)Aug 253 daysGreenway Schond L.Chief Financial OfficerSSale−20.0K$3.80−$76.0K−8.1%228.0K after
Jun 27, 2023 (view filing)Jun 27Same dayBarrow RobertChief Executive OfficerSSale−15.5K$3.20−$49.6K−2.4%623.5K after2 lots
Jun 27, 2023 (view filing)Jun 27Same dayKarlin DanChief Medical OfficerSSale−6.78K$3.20−$21.7K−1.8%378.7K after2 lots
Jun 27, 2023 (view filing)Jun 27Same dayGreenway Schond L.Chief Financial OfficerSSale−11.6K$3.20−$37.2K−4.5%248.0K after2 lots
Mar 2, 2023 (view filing)Mar 11 dayKarlin DanChief Medical OfficerSSale−3.58K$3.51−$12.6K−1.4%260.5K after
Mar 2, 2023 (view filing)Mar 11 dayBarrow RobertChief Executive OfficerSSale−8.27K$3.51−$29.0K−3.3%239.0K after