Alphabet Inc.
MX ˙ BMV ˙ US02079K3059
SecurityMX:GOOGL / Alphabet Inc.
InstitutionCastleark Management Llc
Latest Disclosed Ownership418,019 shares
Latest Disclosed Value $ 120,205,544
Castleark Management Llc reports 9.53% increase in ownership of GOOGL / Alphabet Inc.

On May 15, 2026 - Castleark Management Llc filed a 13F-HR form disclosing ownership of 418,019 shares of Alphabet Inc. (MX:GOOGL) valued at $120,205,544 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 381,639 shares of Alphabet Inc.. This represents a change in shares of 9.53% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F ALPHABET CAP STK CL A 02079K305 418,019 36,380 9.53 120,206 0.63 3.9774
2026-02-12 2025-12-31 13F ALPHABET CAP STK CL A 02079K305 381,639 7,760 2.08 119,453 31.43 3.5066
2025-11-17 2025-09-30 13F ALPHABET CAP STK CL A 02079K305 373,879 -13,635 -3.52 90,890 33.09 2.5484
2025-08-18 2025-06-30 13F ALPHABET CAP STK CL A 02079K305 387,514 21,425 5.85 68,292 20.63 2.0524
2025-05-15 2025-03-31 13F ALPHABET CAP STK CL A 02079K305 366,089 4,390 1.21 56,612 -17.32 1.9620
2025-02-18 2024-12-31 13F ALPHABET CAP STK CL A 02079K305 361,699 -118,310 -24.65 68,470 -13.99 2.3881
2024-11-15 2024-09-30 13F ALPHABET CAP STK CL A 02079K305 480,009 -23,843 -4.73 79,609 -13.26 3.2452
2024-08-14 2024-06-30 13F ALPHABET CAP STK CL A 02079K305 503,852 0 0.00 91,777 20.68 3.7488
2024-05-16 2024-03-31 13F ALPHABET CAP STK CL A 02079K305 503,852 -4,962 -0.98 76,046 6.99 3.1636
2024-02-15 2023-12-31 13F ALPHABET CAP STK CL A 02079K305 508,814 -5,606 -1.09 71,076 5.58 3.1504
2023-11-15 2023-09-30 13F ALPHABET CAP STK CL A 02079K305 514,420 -32,310 -5.91 67,317 2.86 3.4299
2023-08-16 2023-06-30 13F ALPHABET CAP STK CL A 02079K305 546,730 1,390 0.25 65,444 15.69 2.9641
2023-05-16 2023-03-31 13F ALPHABET CAP STK CL A 02079K305 545,340 -8,340 -1.51 56,568 15.80 2.7788
2023-02-10 2022-12-31 13F ALPHABET CAP STK CL A 02079K305 553,680 0 0.00 48,851 -7.76 2.5518
2022-11-15 2022-09-30 13F ALPHABET CAP STK CL A 02079K305 553,680 520,413 1,564.35 52,959 -26.95 2.9471
2022-08-16 2022-06-30 13F ALPHABET CAP STK CL A 02079K305 33,267 2,786 9.14 72,497 -14.49 3.8797
2022-05-16 2022-03-31 13F ALPHABET CAP STK CL A 02079K305 30,481 77 0.25 84,778 -3.75 3.6586
2022-02-16 2021-12-31 13F ALPHABET CAP STK CL A 02079K305 30,404 30,354 60,708.00 88,082 65,632.84 3.2382
2021-11-12 2021-09-30 13F ALPHABET CAP STK CL A 02079K305 50 0 0.00 134 9.84 0.0051
2021-08-17 2021-06-30 13F ALPHABET CAP STK CL A 02079K305 50 0 0.00 122 18.45 0.0041
2021-05-14 2021-03-31 13F ALPHABET CAP STK CL A 02079K305 50 0 0.00 103 17.05 0.0037
2021-02-17 2020-12-31 13F ALPHABET CAP STK CL A 02079K305 50 0 0.00 88 20.55 0.0033
2020-11-16 2020-09-30 13F ALPHABET CAP STK CL A 02079K305 50 0 0.00 73 2.82 0.0029
2020-08-14 2020-06-30 13F ALPHABET CAP STK CL A 02079K305 50 -2,190 -97.77 71 -97.27 0.0031
2020-05-13 2020-03-31 13F ALPHABET CAP STK CL A 02079K305 2,240 2,190 4,380.00 2,603 3,785.07 0.1541
2020-02-14 2019-12-31 13F ALPHABET CAP STK CL A 02079K305 50 0 0.00 67 9.84 0.0027
2019-11-15 2019-09-30 13F ALPHABET CAP STK CL A 02079K305 50 0 0.00 61 12.96 0.0025
2019-08-13 2019-06-30 13F ALPHABET CAP STK CL A 02079K305 50 0 0.00 54 -8.47 0.0021
2019-05-14 2019-03-31 13F ALPHABET CAP STK CL A 02079K305 50 0 0.00 59 13.46 0.0022
2019-02-12 2018-12-31 13F ALPHABET CAP STK CL A 02079K305 50 0 0.00 52 -13.33 0.0022
2018-11-14 2018-09-30 13F ALPHABET CAP STK CL A 02079K305 50 0 0.00 60 7.14 0.0017
2018-08-15 2018-06-30 13F ALPHABET CAP STK CL A 02079K305 50 0 0.00 56 7.69 0.0017
2018-05-14 2018-03-31 13F ALPHABET CAP STK CL A 02079K305 50 0 0.00 52 -1.89 0.0016
2018-02-15 2017-12-31 13F ALPHABET CAP STK CL A 02079K305 50 0 0.00 53 8.16 0.0016
2017-11-15 2017-09-30 13F ALPHABET CAP STK CL A 02079K305 50 0 0.00 49 6.52 0.0015
2017-08-15 2017-06-30 13F ALPHABET CAP STK CL A 02079K305 50 0 0.00 46 9.52 0.0015
2017-05-15 2017-03-31 13F ALPHABET CAP STK CL A 02079K305 50 -180 -78.26 42 -76.92 0.0013
2017-02-15 2016-12-31 13F ALPHABET CAP STK CL A 02079K305 230 0 0.00 182 -1.62 0.0058
2016-11-15 2016-09-30 13F ALPHABET CAP STK CL A 02079K305 230 0 0.00 185 14.20 0.0056
2016-08-10 2016-06-30 13F ALPHABET CAP STK CL A 02079K305 230 0 0.00 162 -7.43 0.0052
2016-05-17 2016-03-31 13F ALPHABET CAP STK CL A 02079K305 230 0 0.00 175 -2.23 0.0055
2016-02-17 2015-12-31 13F ALPHABET CAP STK CL A 02079K305 230 230 179 0.0054
2015-11-17 2015-09-30 13F GOOGLE CL A 38259P508 0 -230 -100.00 0 -100.00
2015-08-17 2015-06-30 13F GOOGLE CL A 38259P508 230 0 0.00 124 -3.12 0.0033
2015-05-15 2015-03-31 13F GOOGLE CL A 38259P508 230 0 0.00 128 4.92 0.0031
2015-02-10 2014-12-31 13F GOOGLE CL A 38259P508 230 -50 -17.86 122 -25.61 0.0031
2014-08-15 2014-06-30 13F GOOGLE CL A 38259P508 280 -66,658 -99.58 164 -99.78 0.0045
2014-02-20 2013-12-31 13F GOOGLE CL A 38259P508 66,938 66,708 29,003.48 75,018 55,468.89 2.1776
2014-11-21 2013-09-30 13F/A-1 GOOGLE CL A 38259P508 230 -50 -17.86 135 -45.34 0.0038
2013-11-20 2013-09-30 13F GOOGLE CL A 38259P508 280 245
2013-09-26 2013-06-30 13F GOOGLE CL A 38259P508 280 280 247 0.0082
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.