Meta Platforms, Inc.
MX ˙ BMV ˙ US30303M1027
SecurityMX:META / Meta Platforms, Inc.
InstitutionMain Street Research LLC
Latest Disclosed Ownership70,962 shares
Latest Disclosed Value $ 40,599,690
Main Street Research LLC reports 18.01% decrease in ownership of META / Meta Platforms, Inc.

On April 30, 2026 - Main Street Research LLC filed a 13F-HR form disclosing ownership of 70,962 shares of Meta Platforms, Inc. (MX:META) valued at $40,599,690 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 9, 2026 disclosing 86,547 shares of Meta Platforms, Inc.. This represents a change in shares of -18.01% 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)
2026-04-30 2026-03-31 13F META PLATFORMS CL A 30303M102 70,962 -15,585 -18.01 40,600 -28.93 2.3625
2026-02-09 2025-12-31 13F META PLATFORMS CL A 30303M102 86,547 -2,636 -2.96 57,129 -12.77 3.2679
2025-11-13 2025-09-30 13F META PLATFORMS CL A 30303M102 89,183 25,536 40.12 65,494 39.42 3.5387
2025-08-05 2025-06-30 13F META PLATFORMS CL A 30303M102 63,647 -39,353 -38.21 46,977 -20.87 2.9242
2025-04-30 2025-03-31 13F META PLATFORMS CL A 30303M102 103,000 3,341 3.35 59,365 1.74 3.8790
2025-02-07 2024-12-31 13F META PLATFORMS CL A 30303M102 99,659 2,613 2.69 58,351 5.04 3.6357
2024-11-12 2024-09-30 13F META PLATFORMS CL A 30303M102 97,046 1,725 1.81 55,553 15.59 3.4955
2024-07-29 2024-06-30 13F META PLATFORMS CL A 30303M102 95,321 3,217 3.49 48,063 7.47 3.1701
2024-05-01 2024-03-31 13F META PLATFORMS CL A 30303M102 92,104 1,652 1.83 44,724 39.69 3.0406
2024-01-30 2023-12-31 13F META PLATFORMS CL A 30303M102 90,452 20,280 28.90 32,016 51.98 2.5708
2023-11-03 2023-09-30 13F META PLATFORMS CL A 30303M102 70,172 69,355 8,488.98 21,066 8,902.56 2.1704
2023-08-08 2023-06-30 13F META PLATFORMS CL A 30303M102 817 817 234 0.0374
2023-05-01 2023-03-31 13F META PLATFORMS CL A 30303M102 0 -9,096 -100.00 0 -100.00
2023-02-06 2022-12-31 13F META PLATFORMS CL A 30303M102 9,096 253 2.86 1,095 -8.83 0.2666
2022-11-14 2022-09-30 13F META PLATFORMS CL A 30303M102 8,843 8,843 1,200 0.2643
2022-08-11 2022-06-30 13F META PLATFORMS CL A 30303M102 0 -1,591 -100.00 0 -100.00
2022-05-05 2022-03-31 13F META PLATFORMS CL A 30303M102 1,591 -1,221 -43.42 354 -62.58 0.0333
2022-02-09 2021-12-31 13F META PLATFORMS CL A 30303M102 2,812 -918 -24.61 946 -25.28 0.0730
2021-11-12 2021-09-30 13F FACEBOOK CL A 30303M102 3,730 1,434 62.46 1,266 58.65 0.1108
2021-08-06 2021-06-30 13F Facebook COM 30303M102 2,296 873 61.35 798 90.45 0.0641
2021-05-07 2021-03-31 13F Facebook COM 30303M102 1,423 -294 -17.12 419 -10.66 0.0394
2021-02-12 2020-12-31 13F Facebook COM 30303M102 1,717 618 56.23 469 62.85 0.0504
2020-11-10 2020-09-30 13F Facebook COM 30303M102 1,099 1,099 288 0.0367
2020-05-01 2020-03-31 13F Facebook COM 30303M102 0 -1,576 -100.00 0 -100.00
2020-01-28 2019-12-31 13F Facebook COM 30303M102 1,576 178 12.73 323 29.72 0.0509
2019-10-21 2019-09-30 13F Facebook COM 30303M102 1,398 -1,055 -43.01 249 -47.36 0.0467
2019-08-08 2019-06-30 13F Facebook COM 30303M102 2,453 -250 -9.25 473 4.88 0.1064
2019-05-13 2019-03-31 13F Facebook COM 30303M102 2,703 -5,390 -66.60 451 -57.49 0.1434
2019-02-13 2018-12-31 13F Facebook COM 30303M102 8,093 -60,265 -88.16 1,061 -90.56 0.4126
2018-11-05 2018-09-30 13F Facebook COM 30303M102 68,358 999 1.48 11,242 -14.11 1.6142
2018-07-25 2018-06-30 13F Facebook COM 30303M102 67,359 -3,077 -4.37 13,089 16.29 2.0494
2018-05-08 2018-03-31 13F/A-1 Facebook COM 30303M102 70,436 -52,262 -42.59 11,255 -48.02 1.7811
2018-05-08 2018-03-31 13F Facebook COM 30303M102 122,698 0 21,651
2018-02-05 2017-12-31 13F Facebook COM 30303M102 122,698 -1,433 -1.15 21,651 2.08 3.2953
2017-10-16 2017-09-30 13F Facebook COM 30303M102 124,131 -1,982 -1.57 21,210 11.39 3.4228
2017-07-18 2017-06-30 13F Facebook COM 30303M102 126,113 4,519 3.72 19,041 10.24 3.1105
2017-05-04 2017-03-31 13F Facebook COM 30303M102 121,594 -61 -0.05 17,272 23.41 3.0250
2017-02-03 2016-12-31 13F Facebook COM 30303M102 121,655 3,885 3.30 13,996 -7.35 2.7254
2016-11-10 2016-09-30 13F Facebook COM 30303M102 117,770 -571 -0.48 15,106 11.70 2.9526
2016-08-11 2016-06-30 13F Facebook COM 30303M102 118,341 1,496 1.28 13,524 1.44 2.7946
2016-05-13 2016-03-31 13F Facebook COM 30303M102 116,845 -2,582 -2.16 13,332 6.66 3.4378
2016-02-04 2015-12-31 13F Facebook COM 30303M102 119,427 -830 -0.69 12,499 1.92 2.6707
2015-11-12 2015-09-30 13F Facebook COM 30303M102 120,257 4,763 4.12 12,263 23.81 2.8767
2015-07-23 2015-06-30 13F Facebook COM 30303M102 115,494 3,531 3.15 9,905 7.60 2.0286
2015-05-12 2015-03-31 13F Facebook COM 30303M102 111,963 -44 -0.04 9,205 5.33 1.9797
2015-02-09 2014-12-31 13F Facebook COM 30303M102 112,007 81,135 262.81 8,739 258.16 1.8713
2014-11-13 2014-09-30 13F Facebook COM 30303M102 30,872 3,445 12.56 2,440 32.18 0.5433
2014-08-11 2014-06-30 13F Facebook COM 30303M102 27,427 6,264 29.60 1,846 44.78 0.4353
2014-05-12 2014-03-31 13F Facebook COM 30303M102 21,163 2,838 15.49 1,275 27.37 0.3097
2014-02-06 2013-12-31 13F Facebook COM 30303M102 18,325 918 5.27 1,001 14.53 0.2499
2013-11-12 2013-09-30 13F Facebook COM 30303M102 17,407 2,737 18.66 874 139.45 0.2361
2013-08-01 2013-06-30 13F Facebook COM 30303M102 14,670 14,670 365 0.1102
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.