빔 테라퓨틱스(주)
MX ˙ BMV ˙ US07373V1052
SecurityMX:BEAM / Beam Therapeutics Inc.
InstitutionRhumbline Advisers
Latest Disclosed Ownership112,239 shares
Latest Disclosed Value $ 2,674,642
Rhumbline Advisers reports 14.45% decrease in ownership of BEAM / Beam Therapeutics Inc.

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 112,239 shares of Beam Therapeutics Inc. (MX:BEAM) valued at $2,674,642 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 131,199 shares of Beam Therapeutics Inc.. This represents a change in shares of -14.45% 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)
2026-05-12 2026-03-31 13F BEAM THERAPEUTICS COM 07373V105 112,239 -18,960 -14.45 2,675 -26.46 0.0023
2026-02-13 2025-12-31 13F BEAM THERAPEUTICS COM 07373V105 131,199 -12,629 -8.78 3,637 4.18 0.0029
2025-11-06 2025-09-30 13F BEAM THERAPEUTICS COM 07373V105 143,828 -7,544 -4.98 3,491 35.59 0.0028
2025-08-12 2025-06-30 13F BEAM THERAPEUTICS COM 07373V105 151,372 10,168 7.20 2,575 -6.64 0.0022
2025-05-29 2025-03-31 13F/A-1 BEAM THERAPEUTICS COM 07373V105 141,204 14,971 11.86 2,758 -11.92 0.0026
2025-04-08 2025-03-31 13F BEAM THERAPEUTICS COM 07373V105 141,204 14,971 2,758 0.0026
2025-05-29 2024-12-31 13F/A-1 BEAM THERAPEUTICS COM 07373V105 126,233 -872 -0.69 3,131 0.51 0.0028
2025-01-30 2024-12-31 13F BEAM THERAPEUTICS COM 07373V105 126,233 -872 3,131 0.0028
2024-11-12 2024-09-30 13F BEAM THERAPEUTICS COM 07373V105 127,105 -5,464 -4.12 3,114 0.26 0.0028
2024-08-01 2024-06-30 13F BEAM THERAPEUTICS COM 07373V105 132,569 23,565 21.62 3,106 -13.75 0.0029
2024-05-09 2024-03-31 13F BEAM THERAPEUTICS COM 07373V105 109,004 4,792 4.60 3,601 26.97 0.0035
2024-02-08 2023-12-31 13F BEAM THERAPEUTICS COM 07373V105 104,212 -1,284 -1.22 2,837 11.79 0.0030
2023-11-09 2023-09-30 13F BEAM THERAPEUTICS COM 07373V105 105,496 10,412 10.95 2,537 -16.44 0.0029
2023-08-08 2023-06-30 13F BEAM THERAPEUTICS COM 07373V105 95,084 7,136 8.11 3,036 151,700.00 0.0034
2023-05-11 2023-03-31 13F BEAM THERAPEUTICS COM 07373V105 87,948 1,408 1.63 3 -99.94 0.0033
2023-02-14 2022-12-31 13F BEAM THERAPEUTICS COM 07373V105 86,540 1,583 1.86 3,385 -16.36 0.0046
2022-11-10 2022-09-30 13F BEAM THERAPEUTICS COM 07373V105 84,957 8,763 11.50 4,047 37.23 0.0060
2022-08-11 2022-06-30 13F BEAM THERAPEUTICS COM 07373V105 76,194 21,992 40.57 2,949 -5.05 0.0043
2022-05-12 2022-03-31 13F BEAM THERAPEUTICS COM 07373V105 54,202 2,389 4.61 3,106 -24.78 0.0040
2022-02-10 2021-12-31 13F BEAM THERAPEUTICS COM 07373V105 51,813 -128 -0.25 4,129 -8.63 0.0051
2021-11-12 2021-09-30 13F BEAM THERAPEUTICS COM 07373V105 51,941 3,210 6.59 4,519 -27.95 0.0061
2021-08-05 2021-06-30 13F BEAM THERAPEUTICS COM 07373V105 48,731 5,030 11.51 6,272 79.30 0.0082
2021-05-06 2021-03-31 13F BEAM THERAPEUTICS COM 07373V105 43,701 -2,536 -5.48 3,498 -7.34 0.0048
2021-02-10 2020-12-31 13F BEAM THERAPEUTICS COM 07373V105 46,237 9,204 24.85 3,775 313.93 0.0052
2020-11-12 2020-09-30 13F BEAM THERAPEUTICS COM 07373V105 37,033 22,386 152.84 912 122.44 0.0014
2020-08-13 2020-06-30 13F BEAM THERAPEUTICS COM 07373V105 14,647 2,954 25.26 410 95.24 0.0007
2020-05-06 2020-03-31 13F BEAM THERAPEUTICS COM 07373V105 11,693 11,693 210 0.0004
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.