Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionAdvisor Group Holdings, Inc.
Latest Disclosed Ownership12,238 shares
Latest Disclosed Value $ 9,460,844
Advisor Group Holdings, Inc. ownership in REGN / Regeneron Pharmaceuticals, Inc.

On May 15, 2026 - Advisor Group Holdings, Inc. filed a 13F-HR form disclosing ownership of 12,238 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $9,460,844 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 11,799 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 3.72% during the quarter.

Advisor Group Holdings, Inc. has a history of taking positions in derivatives of the underlying security (REGN) in the form of stock options. The firm currently holds call options representing 6 of underlying shares valued at $195,360 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

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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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

MX:REGN / Regeneron Pharmaceuticals, Inc. Historical Put/Call Ratio
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 REGENERON PHARMACEUTICALS COM 75886F107 12,238 439 3.72 9,461 3.80 0.0081
2026-02-17 2025-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 11,799 -2,937 -19.93 9,115 8.51 0.0133
2025-11-14 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 14,736 -2,332 -13.66 8,400 -12.57 0.0118
2025-09-04 2025-06-30 13F/A-1 EGENERON PHARMACEUTICALS COM 75886F107 17,068 6,073 55.23 9,607 37.73 0.0171
2025-08-13 2025-06-30 13F EGENERON PHARMACEUTICALS COM 75886F107 15,191 4,196 9,640 0.0213
2025-05-12 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 10,995 -5,242 -32.28 6,976 -7.09 0.0155
2025-06-06 2024-12-31 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 16,237 6,895 73.81 7,507 -23.57 0.0169
2025-02-07 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 14,687 5,345 7,724 0.0197
2024-11-13 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 9,342 1,417 17.88 9,822 17.91 0.0221
2024-08-13 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 7,925 -2,374 -23.05 8,330 -15.97 0.0197
2024-05-10 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 10,299 -5,299 -33.97 9,913 -27.64 0.0221
2024-02-12 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 15,598 -2,470 -13.67 13,699 -7.87 0.0240
2023-11-13 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 18,068 7,711 74.45 14,869 99.96 0.0220
2023-08-21 2023-06-30 13F/A-1 REGENERON PHARMACEUTICALS COM 75886F107 10,357 -135 -1.29 7,437 -13.76 0.0134
2023-08-10 2023-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 36,906 26,414 7,410 0.0020
2023-05-12 2023-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 10,492 -1,644 -13.55 8,622 -1.53 0.0162
2023-02-10 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 12,136 -3,223 -20.98 8,756 -17.24 0.0177
2022-11-14 2022-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 15,359 538 3.63 10,580 20.65 0.0242
2022-08-10 2022-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 14,821 -2,691 -15.37 8,769 -24.11 0.0193
2022-05-04 2022-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 17,512 -320 -1.79 11,555 2.63 0.0224
2022-02-03 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 17,832 6,250 53.96 11,259 60.96 0.0213
2021-11-05 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 11,582 855 7.97 6,995 16.70 0.0146
2021-08-02 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 10,727 966 9.90 5,994 29.77 0.0130
2021-05-13 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 9,761 -497 -4.84 4,619 -6.76 0.0111
2021-02-10 2020-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 10,258 -130 -1.25 4,954 -14.87 0.0132
2020-11-12 2020-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 10,388 -6,192 -37.35 5,819 -43.71 0.0174
2020-08-14 2020-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 16,580 -51,451 -75.63 10,337 72.11 0.0347
2020-05-18 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 68,031 68,031 6,006 0.0246
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F REGENERON PHARMACEUTICALS CALL Call 6 -14.29 195 -18.07 n/a n/a n/a
2026-02-17 2025-12-31 13F REGENERON PHARMACEUTICALS CALL Call 7 238 n/a n/a n/a
2025-05-12 2025-03-31 13F REGENERON PHARMACEUTICALS CALL Call 0 -100.00 0 -100.00 n/a n/a n/a
2025-02-07 2024-12-31 13F REGENERON PHARMACEUTICALS CALL Call 1 0.00 28 0.00 n/a n/a n/a
2024-11-13 2024-09-30 13F REGENERON PHARMACEUTICALS CALL Call 1 0.00 28 -6.90 n/a n/a n/a
2024-08-13 2024-06-30 13F REGENERON PHARMACEUTICALS CALL Call 1 0.00 30 20.83 n/a n/a n/a
2024-05-10 2024-03-31 13F REGENERON PHARMACEUTICALS CALL Call 1 24 n/a n/a n/a
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.