InsidersTradesSigma
Total declarations
Companies
▲ Purchases (1 ops.)
▼ Sales (2 ops.)
Insider track record
CEODisclosed buys
1
Disclosed sells
2
T+90 hit rate
56%
T+90 mean return
+6.7%
Across 9 buy signals with a settled T+90 return. Return basis: close on the day after publication.
Signal history
Explore the full record of transactions filed by Stubblefield Michael, Chairman & CEO. Director active across 2 companies, notably Avantor, Inc.. Cumulatively, 24 disclosures have been recorded. Breakdown: 1 buy · 2 sells. Total volume traded: €10.5m. Activity tracked since 17 May 2021. The latest transaction was filed on 21 May 2025 (Don). Regulator: SEC (Form 4). The full history is openly available.
Declarations24 total
76,000 shares0Common StockSEC:0001722482-25-000161:0
6,800 shares@ US$17.470.5% of flowCommon StockSEC:0001722482-25-000049:0
157,232 shares0Common StockSEC:0001722482-25-000035:0
107,802 shares0Common StockSEC:0001722482-24-000068:0
99,075 shares0Common StockSEC:0001722482-24-000043:0
9,711 shares@ US$24.050.9% of flowCommon StockSEC:0001722482-24-000023:0
1,857 sharesCommon StockSEC:0001140361-23-038641:0
40,000 shares0Common StockSEC:0001722482-23-000140:0
40,000 shares0Common StockSEC:0001722482-23-000140:1
106,200 shares@ US$20.288.6% of flowCommon StockSEC:0001722482-23-000135:0
7,422 shares@ US$24.590.7% of flowCommon StockSEC:0001722482-23-000066:0
15,026 shares@ US$24.541.5% of flowCommon StockSEC:0001722482-23-000057:0
223,482 shares0Common StockSEC:0001722482-23-000024:0
15,000 shares@ US$20.951.3% of flowCommon StockSEC:0001722482-22-000189:0
Canonical exit: 14 Feb 2023 (T+90)
108,700 shares@ US$31.330.041% mcap16.2% of flowCommon StockSEC:0001722482-22-000140:0
14,500 shares0Common StockSEC:0001722482-22-000116:0
69,885 shares0Common StockSEC:0001722482-22-000049:0
10,959 shares@ US$34.000.0042% mcap1.6% of flowCommon StockSEC:0001722482-22-000043:0
141,300 shares@ US$42.370.065% mcap25.6% of flowCommon StockSEC:0001722482-21-000228:0
141,300 shares@ US$42.3722.1% of flowCommon StockSEC:0001722482-21-000228
152,643 shares@ US$3.130.0050% mcap2.0% of flowCommon StockSEC:0001722482-21-000179:0
152,643 shares@ US$3.131.7% of flowCommon StockSEC:0001722482-21-000179
106,200 shares@ US$30.900.035% mcap13.5% of flowCommon StockSEC:0001722482-21-000147:0
106,200 shares@ US$30.9013.5% of flowCommon StockSEC:0001722482-21-000147
24 of 24 declarations
About Stubblefield Michael
Michael Stubblefield is the President and CEO of Avantor, Inc. He leads the company in its efforts to provide innovative solutions in the life sciences sector.
