ALTAROCK PARTNERS LP: MICROSOFT (MSFT): Quarterly 13F Position History
As of Q1 2026, ALTAROCK PARTNERS LP reported 1,867,537 shares of MICROSOFT (MSFT), worth $691.3M and representing 16.8% of its 13F equity book. Quarter-over-quarter share count change: 214,820 (-10.3%) . The position first appeared in Q2 2021 and has been disclosed across 20 13F-HR filings in Pactolio's tracked window.
- 1,867,537Shares Held (Latest Filing)
- $691.3MReported Market Value (Latest Filing)
- 16.8%Portfolio Weight (% of 13F Equity Book)
- 214,820Quarter-over-Quarter Share Change
- -$315.8MQuarter-over-Quarter Value Change
- 2,818,509Peak Reported Shares (Historical)
Quarterly 13F-HR Disclosure History Source: SEC 13F-HR filings, 20 quarter s
| Quarter | Shares | QoQ Share Change | Share Change (%) | Market Value | Weight | Implied Price |
|---|---|---|---|---|---|---|
| Q1 2026 | 1,867,537 | 214,820 | -10.3% | $691.3M | 16.8% | $370.2 |
| Q4 2025 | 2,082,357 | 486,910 | -19.0% | $1.0B | 19.7% | $483.6 |
| Q3 2025 | 2,569,267 | 9,382 | -0.4% | $1.3B | 24.3% | $518.0 |
| Q2 2025 | 2,578,649 | 0 | — | $1.3B | 23.4% | $497.4 |
| Q1 2025 | 2,578,649 | +687,008 | +36.3% | $968.0M | 19.5% | $375.4 |
| Q4 2024 | 1,891,641 | 43,175 | -2.2% | $797.3M | 16.1% | $421.5 |
| Q3 2024 | 1,934,816 | 0 | — | $832.6M | 16.4% | $430.3 |
| Q2 2024 | 1,934,816 | +180,630 | +10.3% | $864.8M | 17.8% | $446.9 |
| Q1 2024 | 1,754,186 | 236,528 | -11.9% | $738.0M | 15.9% | $420.7 |
| Q4 2023 | 1,990,714 | 220,798 | -10.0% | $748.6M | 16.7% | $376.0 |
| Q3 2023 | 2,211,512 | 60,529 | -2.7% | $698.3M | 17.5% | $315.8 |
| Q2 2023 | 2,272,041 | 59,888 | -2.6% | $773.7M | 18.6% | $340.5 |
| Q1 2023 | 2,331,929 | 228,200 | -8.9% | $672.3M | 18.4% | $288.3 |
| Q4 2022 | 2,560,129 | 258,380 | -9.2% | $614.0M | 19.3% | $239.8 |
| Q3 2022 | 2,818,509 | +86,500 | +3.2% | $656.4M | 21.5% | $232.9 |
| Q2 2022 | 2,732,009 | +96,700 | +3.7% | $701.7M | 21.7% | $256.8 |
| Q1 2022 | 2,635,309 | +915,133 | +53.2% | $812.5M | 20.7% | $308.3 |
| Q4 2021 | 1,720,176 | 0 | — | $578.5M | 15.2% | $336.3 |
| Q3 2021 | 1,720,176 | +896,843 | +108.9% | $485.0M | 13.1% | $281.9 |
| Q2 2021 | 823,333 | — | — | $223.0M | 6.2% | $270.9 |
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 ALTAROCK PARTNERS LP first disclose a MSFT position in 13F-HR filings?
ALTAROCK PARTNERS LP first reported MICROSOFT (MSFT) on its 13F-HR filing for the period ending 2021-06-30 (Q2 2021). The position has appeared on 20 reported quarters within Pactolio's tracked window.
What was ALTAROCK PARTNERS LP's most recent quarter-over-quarter share-count change in MSFT?
Between Q4 2025 and Q1 2026, ALTAROCK PARTNERS LP reduced its MSFT position by 214,820 shares (-10.3%), leaving 1,867,537 shares at a market value of $691.3M.
Does the implied price-per-share represent ALTAROCK PARTNERS 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.