Engine Capital Management, LP: AVANTOR INC (AVTR) (AVTR): Quarterly 13F Position History
As of Q1 2026, Engine Capital Management, LP reported 19,780,830 shares of AVANTOR INC (AVTR) (AVTR), worth $155.1M and representing 18.7% of its 13F equity book. Quarter-over-quarter share count change: + 7,853,018 (+65.8%) . The position first appeared in Q2 2025 and has been disclosed across 4 13F-HR filings in Pactolio's tracked window.
- 19,780,830Shares Held (Latest Filing)
- $155.1MReported Market Value (Latest Filing)
- 18.7%Portfolio Weight (% of 13F Equity Book)
- +7,853,018Quarter-over-Quarter Share Change
- +$18.4MQuarter-over-Quarter Value Change
- 19,780,830Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 4 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 19,780,830 | +7,853,018 | +65.8% | $155.1M | 18.7% | $7.8 |
| Q4 2025 | 11,927,812 | 7,792,618 | -39.5% | $136.7M | 18.9% | $11.5 |
| Q3 2025 | 19,720,430 | +14,216,121 | +258.3% | $246.1M | 29.2% | $12.5 |
| Q2 2025 | 5,504,309 | — | — | $74.1M | 15.6% | $13.5 |
Methodology & FAQ
How This Position History Is Sourced
Each row is one SEC Form 13F-HR filing disclosing this position. Share count, market value, and reported quarter are taken verbatim from the filing; portfolio weight is recomputed against the same filing's total reported equity book. Implied price-per-share is market value divided by shares — a quarter-end mark, not the manager's cost basis. See the full methodology document for the normalization rules.
When did Engine Capital Management, LP first disclose a AVTR position in 13F-HR filings?
Engine Capital Management, LP first reported AVANTOR INC (AVTR) (AVTR) on its 13F-HR filing for the period ending 2025-06-30 (Q2 2025). The position has appeared on 4 reported quarters within Pactolio's tracked window.
What was Engine Capital Management, LP's most recent quarter-over-quarter share-count change in AVTR?
Between Q4 2025 and Q1 2026, Engine Capital Management, LP added 7,853,018 shares of AVTR (+65.8%), bringing the total reported position to 19,780,830 shares at a market value of $155.1M.
Does the implied price-per-share represent Engine Capital Management, LP's cost basis in AVTR?
No. The implied price-per-share column is the 13F-HR reported market value divided by reported share count on the filing date (end of quarter). It is a quarter-end mark, not a cost basis or transaction price. Use it as a sanity check on the value column, not as an indicator of the manager's entry or exit price.