Mark Massey
AltaRock Partners
Mark Massey Microsoft Corp stake
total: 19
AltaRock Partners MSFT trades
- Total transactions:
- 17
- New positions:
- 1
- Added:
- 6
- Reduced:
- 10
- Held since:
- 2021 Q2
- Held for:
- 20 quarters
- Latest activity:
- 2026 Q1
According to 2026 Q1 report, Mark Massey holds 1,867,537 Microsoft Corp (MSFT) shares with a market value of roughly $691.31M accounting for 16.75% of the overall portfolio. To date, the estimated cost basis is nearly $309.71 for "buy" trades and estimated average "sell" price is $378.23. AltaRock Partners first purchased MSFT in 2021 Q2, initially acquiring 823,333 shares. Since the initial investment in Microsoft Corp (MSFT), AltaRock Partners has made 16 more transactions.
When did Mark Massey buy Microsoft Corp (MSFT)?
Mark Massey first invested in Microsoft Corp (MSFT) in 2021 Q2 at the reported quarter-end price of $270.90 per share.
What's the cost basis of AltaRock Partners's MSFT stake?
The estimated cost basis for Microsoft Corp (MSFT) stake is around $309.71 per share. This represents their average reported price* across all buy transactions
Estimated cost basis*
- Weighted AVG buy price:
- $309.71
- Weighted AVG sell price:
- $378.23
Mark Massey's historical trades in Microsoft Corp
17 results
| Period |
% of portfolio |
Shares held after* |
Reported price* |
Value* |
% (shares) of activity |
% change to portfolio |
|---|---|---|---|---|---|---|
|
2026 Q1
|
16.75%
|
1,867,537
|
$370.17
|
$691,306,171
|
-10.32% (-214,820)
|
-1.56%
|
|
2025 Q4
|
19.75%
|
2,082,357
|
$483.62
|
$1,007,069,492
|
-18.95% (-486,910)
|
-4.31%
|
|
2025 Q3
|
24.33%
|
2,569,267
|
$517.95
|
$1,330,751,843
|
-0.36% (-9,382)
|
-0.09%
|
|
2025 Q1
|
19.46%
|
2,578,649
|
$375.39
|
$967,999,048
|
+36.32% (+687,008)
|
+5.19%
|
|
2024 Q4
|
16.13%
|
1,891,641
|
$421.50
|
$797,326,682
|
-2.23% (-43,175)
|
-0.36%
|
|
2024 Q2
|
17.80%
|
1,934,816
|
$446.95
|
$864,766,011
|
+10.30% (+180,630)
|
+1.66%
|
|
2024 Q1
|
15.86%
|
1,754,186
|
$420.72
|
$738,021,134
|
-11.88% (-236,528)
|
-2.22%
|
|
2023 Q4
|
16.70%
|
1,990,714
|
$376.04
|
$748,588,093
|
-9.98% (-220,798)
|
-2.08%
|
|
2023 Q3
|
17.49%
|
2,211,512
|
$315.75
|
$698,284,914
|
-2.66% (-60,529)
|
-0.46%
|
|
2023 Q2
|
18.58%
|
2,272,041
|
$340.54
|
$773,720,842
|
-2.57% (-59,888)
|
-0.56%
|
|
2023 Q1
|
18.42%
|
$288.30
|
-8.91% (-228,200)
|
|||
|
2022 Q4
|
19.30%
|
$239.82
|
-9.17% (-258,380)
|
|||
|
2022 Q3
|
21.49%
|
$232.90
|
+3.17% (+86,500)
|
|||
|
2022 Q2
|
21.65%
|
$256.83
|
+3.67% (+96,700)
|
|||
|
2022 Q1
|
20.72%
|
$308.31
|
+53.20% (+915,133)
|
|||
|
2021 Q3
|
13.08%
|
$281.92
|
+108.93% (+896,843)
|
|||
|
2021 Q2
|
6.17%
|
$270.90
|
new
|
|||
* Shares, change to shares, sold shares, shares held after: split-adjusted.
* Reported price: this doesn't represent the actual buy or sell price. It is the split-adjusted price of the security as of the last day of the reported period.
If the security is completely sold out, we show the reported split-adjusted price prior to the actual period.
If the security is completely sold out, we show the reported split-adjusted price prior to the actual period.
* Estimated cost basis: based on "Reported price*" (not earlier than 2013 Q2). Calculation starts from the latest "new buy" activity to the latest "close out" activity (if any).
* Value or Price: If the security is completely sold out, we show the reported value (or price) prior to the actual period.
* New buy or own: this means there is no earlier reporting (for us or in general). So we can't know if the actual purchase of the security happened at the reported period or earlier.