Alphabet Inc.
MX ˙ BMV ˙ US02079K1079
SecurityMX:GOOG / Alphabet Inc.
InstitutionCastleark Management Llc
Latest Disclosed Ownership29,610 shares
Latest Disclosed Value $ 8,493,925
Castleark Management Llc reports 323.00% increase in ownership of GOOG / Alphabet Inc.

On May 15, 2026 - Castleark Management Llc filed a 13F-HR form disclosing ownership of 29,610 shares of Alphabet Inc. (MX:GOOG) valued at $8,493,925 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 7,000 shares of Alphabet Inc.. This represents a change in shares of 323.00% 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 C 02079K107 29,610 22,610 323.00 8,494 286.75 0.2811
2026-02-12 2025-12-31 13F ALPHABET CAP STK CL C 02079K107 7,000 0 0.00 2,197 28.87 0.0645
2025-11-17 2025-09-30 13F ALPHABET CAP STK CL C 02079K107 7,000 0 0.00 1,705 37.31 0.0478
2025-08-18 2025-06-30 13F ALPHABET CAP STK CL C 02079K107 7,000 0 0.00 1,242 13.54 0.0373
2025-05-15 2025-03-31 13F ALPHABET CAP STK CL C 02079K107 7,000 0 0.00 1,094 -18.00 0.0379
2025-02-18 2024-12-31 13F ALPHABET CAP STK CL C 02079K107 7,000 0 0.00 1,333 13.93 0.0465
2024-11-15 2024-09-30 13F ALPHABET CAP STK CL C 02079K107 7,000 0 0.00 1,170 -8.81 0.0477
2024-08-14 2024-06-30 13F ALPHABET CAP STK CL C 02079K107 7,000 0 0.00 1,284 20.47 0.0524
2024-05-16 2024-03-31 13F ALPHABET CAP STK CL C 02079K107 7,000 0 0.00 1,066 8.01 0.0443
2024-02-15 2023-12-31 13F ALPHABET CAP STK CL C 02079K107 7,000 0 0.00 987 6.94 0.0437
2023-11-15 2023-09-30 13F ALPHABET CAP STK CL C 02079K107 7,000 0 0.00 923 8.98 0.0470
2023-08-16 2023-06-30 13F ALPHABET CAP STK CL C 02079K107 7,000 0 0.00 847 16.21 0.0384
2023-05-16 2023-03-31 13F ALPHABET CAP STK CL C 02079K107 7,000 0 0.00 728 17.23 0.0358
2023-02-10 2022-12-31 13F ALPHABET CAP STK CL C 02079K107 7,000 0 0.00 621 -7.73 0.0324
2022-11-15 2022-09-30 13F ALPHABET CAP STK CL C 02079K107 7,000 6,650 1,900.00 673 -12.14 0.0375
2022-08-16 2022-06-30 13F ALPHABET CAP STK CL C 02079K107 350 0 0.00 766 -21.68 0.0410
2022-05-16 2022-03-31 13F ALPHABET CAP STK CL C 02079K107 350 0 0.00 978 -3.46 0.0422
2022-02-16 2021-12-31 13F ALPHABET CAP STK CL C 02079K107 350 0 0.00 1,013 8.57 0.0372
2021-11-12 2021-09-30 13F ALPHABET CAP STK CL C 02079K107 350 0 0.00 933 6.39 0.0357
2021-08-17 2021-06-30 13F ALPHABET CAP STK CL C 02079K107 350 0 0.00 877 21.13 0.0295
2021-05-14 2021-03-31 13F ALPHABET CAP STK CL C 02079K107 350 0 0.00 724 18.11 0.0261
2021-02-17 2020-12-31 13F ALPHABET CAP STK CL C 02079K107 350 0 0.00 613 19.26 0.0229
2020-11-16 2020-09-30 13F ALPHABET CAP STK CL C 02079K107 350 -45,650 -99.24 514 -99.21 0.0201
2020-08-14 2020-06-30 13F ALPHABET CAP STK CL C 02079K107 46,000 14,250 44.88 65,026 76.13 2.8279
2020-05-13 2020-03-31 13F ALPHABET CAP STK CL C 02079K107 31,750 -3,280 -9.36 36,919 -21.17 2.1860
2020-02-14 2019-12-31 13F ALPHABET CAP STK CL C 02079K107 35,030 -1,680 -4.58 46,836 4.66 1.8743
2019-11-15 2019-09-30 13F ALPHABET CAP STK CL C 02079K107 36,710 -2,439 -6.23 44,749 5.75 1.8254
2019-08-13 2019-06-30 13F ALPHABET CAP STK CL C 02079K107 39,149 -810 -2.03 42,317 -9.74 1.6234
2019-05-14 2019-03-31 13F ALPHABET CAP STK CL C 02079K107 39,959 -12,163 -23.34 46,884 -13.14 1.7648
2019-02-12 2018-12-31 13F ALPHABET CAP STK CL C 02079K107 52,122 29,673 132.18 53,978 101.47 2.3001
2018-11-14 2018-09-30 13F ALPHABET CAP STK CL C 02079K107 22,449 -230 -1.01 26,792 5.89 0.7699
2018-08-15 2018-06-30 13F ALPHABET CAP STK CL C 02079K107 22,679 -250 -1.09 25,302 6.95 0.7788
2018-05-14 2018-03-31 13F ALPHABET CAP STK CL C 02079K107 22,929 -1,160 -4.82 23,658 -6.15 0.7492
2018-02-15 2017-12-31 13F ALPHABET CAP STK CL C 02079K107 24,089 -1,310 -5.16 25,207 3.48 0.7568
2017-11-15 2017-09-30 13F ALPHABET CAP STK CL C 02079K107 25,399 -14,183 -35.83 24,360 -32.28 0.7646
2017-08-15 2017-06-30 13F ALPHABET CAP STK CL C 02079K107 39,582 -19,286 -32.76 35,969 -26.35 1.1756
2017-05-15 2017-03-31 13F ALPHABET CAP STK CL C 02079K107 58,868 6,687 12.82 48,835 21.26 1.5303
2017-02-15 2016-12-31 13F ALPHABET CAP STK CL C 02079K107 52,181 -17,674 -25.30 40,274 -25.83 1.2846
2016-11-15 2016-09-30 13F ALPHABET CAP STK CL C 02079K107 69,855 15,460 28.42 54,298 44.23 1.6423
2016-08-10 2016-06-30 13F ALPHABET CAP STK CL C 02079K107 54,395 -34,285 -38.66 37,647 -43.01 1.2008
2016-05-17 2016-03-31 13F ALPHABET CAP STK CL C 02079K107 88,680 15,480 21.15 66,062 18.92 2.0631
2016-02-17 2015-12-31 13F ALPHABET CAP STK CL C 02079K107 73,200 73,200 55,550 1.6694
2015-11-17 2015-09-30 13F GOOGLE CL C 38259P706 0 -40,139 -100.00 0 -100.00
2015-08-17 2015-06-30 13F GOOGLE CL C 38259P706 40,139 -1,301 -3.14 20,893 -8.00 0.5581
2015-05-15 2015-03-31 13F GOOGLE CL C 38259P706 41,440 -30,250 -42.20 22,709 -39.82 0.5476
2015-02-10 2014-12-31 13F GOOGLE CL C 38259P706 71,690 11,550 19.21 37,738 -43.70 0.9723
2014-11-17 2014-09-30 13F GOOGLE CL A 38259P706 60,140 -61,710 -50.64 67,027 -4.38 1.9058
2014-08-15 2014-06-30 13F GOOGLE CL C 38259P706 121,850 61,710 102.61 70,098 4.58 1.9319
2014-05-20 2014-03-31 13F GOOGLE CL A 38259P706 60,140 -31,466 -34.35 67,027 26.73 1.9058
2014-11-21 2013-09-30 13F/A-1 GOOGLE CL C 38259P706 91,606 91,606 52,890 1.4912
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.