Senator Investment Group LP: MICROSOFT (MSFT): Quarterly 13F Position History
As of Q1 2026, Senator Investment Group LP reported 267,500 shares of MICROSOFT (MSFT), worth $99.0M and representing 4.5% of its 13F equity book. Quarter-over-quarter share count change: + 80,000 (+42.7%) . The position first appeared in Q1 2022 and has been disclosed across 17 13F-HR filings in Pactolio's tracked window.
- 267,500Shares Held (Latest Filing)
- $99.0MReported Market Value (Latest Filing)
- 4.5%Portfolio Weight (% of 13F Equity Book)
- +80,000Quarter-over-Quarter Share Change
- +$8.3MQuarter-over-Quarter Value Change
- 570,000Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 17 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 267,500 | +80,000 | +42.7% | $99.0M | 4.5% | $370.2 |
| Q4 2025 | 187,500 | 12,500 | -6.3% | $90.7M | 3.6% | $483.6 |
| Q3 2025 | 200,000 | 7,500 | -3.6% | $103.6M | 3.8% | $518.0 |
| Q2 2025 | 207,500 | +32,500 | +18.6% | $103.2M | 4.0% | $497.4 |
| Q1 2025 | 175,000 | +20,000 | +12.9% | $65.7M | 3.5% | $375.4 |
| Q4 2024 | 155,000 | +30,000 | +24.0% | $65.3M | 1.9% | $421.5 |
| Q3 2024 | 125,000 | 0 | — | $53.8M | 2.6% | $430.3 |
| Q2 2024 | 125,000 | 25,000 | -16.7% | $55.9M | 2.7% | $446.9 |
| Q1 2024 | 150,000 | 10,000 | -6.3% | $63.1M | 2.9% | $420.7 |
| Q4 2023 | 160,000 | 25,000 | -13.5% | $60.2M | 2.6% | $376.0 |
| Q3 2023 | 185,000 | 0 | — | $58.4M | 3.3% | $315.8 |
| Q2 2023 | 185,000 | 15,000 | -7.5% | $63.0M | 2.8% | $340.5 |
| Q1 2023 | 200,000 | +200,000 | — | $57.7M | 3.1% | $288.3 |
| Q4 2022 | 0 | 150,000 | -100.0% | $0 | 0.0% | — |
| Q3 2022 | 150,000 | +150,000 | — | $34.9M | 3.2% | $232.9 |
| Q2 2022 | 0 | 570,000 | -100.0% | $0 | 0.0% | — |
| Q1 2022 | 570,000 | — | — | $175.7M | 5.4% | $308.3 |
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 MSFT position in 13F-HR filings?
Senator Investment Group LP first reported MICROSOFT (MSFT) on its 13F-HR filing for the period ending 2022-03-31 (Q1 2022). The position has appeared on 17 reported quarters within Pactolio's tracked window.
What was Senator Investment Group LP's most recent quarter-over-quarter share-count change in MSFT?
Between Q4 2025 and Q1 2026, Senator Investment Group LP added 80,000 shares of MSFT (+42.7%), bringing the total reported position to 267,500 shares at a market value of $99.0M.
Does the implied price-per-share represent Senator Investment Group LP's cost basis in MSFT?
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.