Senator Investment Group LP: TAIWAN SEMIC-ADR (TSM): Quarterly 13F Position History
As of Q1 2026, Senator Investment Group LP reported 262,500 shares of TAIWAN SEMIC-ADR (TSM), worth $88.7M and representing 4.1% of its 13F equity book. Quarter-over-quarter share count change: 62,000 (-19.1%) . The position first appeared in Q4 2023 and has been disclosed across 10 13F-HR filings in Pactolio's tracked window.
- 262,500Shares Held (Latest Filing)
- $88.7MReported Market Value (Latest Filing)
- 4.1%Portfolio Weight (% of 13F Equity Book)
- 62,000Quarter-over-Quarter Share Change
- -$9.9MQuarter-over-Quarter Value Change
- 324,500Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 10 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 262,500 | 62,000 | -19.1% | $88.7M | 4.1% | $337.9 |
| Q4 2025 | 324,500 | +139,487 | +75.4% | $98.6M | 4.0% | $303.9 |
| Q3 2025 | 185,013 | 0 | — | $51.7M | 1.9% | $279.3 |
| Q2 2025 | 185,013 | 24,025 | -11.5% | $41.9M | 1.6% | $226.5 |
| Q1 2025 | 209,038 | +200,000 | +2212.9% | $34.7M | 1.8% | $166.0 |
| Q4 2024 | 9,038 | +9,038 | — | $1.8M | 0.1% | $197.5 |
| Q3 2024 | 0 | 9,038 | -100.0% | $0 | 0.0% | — |
| Q2 2024 | 9,038 | +867 | +10.6% | $1.6M | 0.1% | $173.8 |
| Q1 2024 | 8,171 | +2,729 | +50.1% | $1.1M | 0.1% | $136.1 |
| Q4 2023 | 5,442 | — | — | $566.0K | 0.0% | $104.0 |
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 Senator Investment Group LP first disclose a TSM position in 13F-HR filings?
Senator Investment Group LP first reported TAIWAN SEMIC-ADR (TSM) on its 13F-HR filing for the period ending 2023-12-31 (Q4 2023). The position has appeared on 10 reported quarters within Pactolio's tracked window.
What was Senator Investment Group LP's most recent quarter-over-quarter share-count change in TSM?
Between Q4 2025 and Q1 2026, Senator Investment Group LP reduced its TSM position by 62,000 shares (-19.1%), leaving 262,500 shares at a market value of $88.7M.
Does the implied price-per-share represent Senator Investment Group LP's cost basis in TSM?
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.