Regeneron Pharmaceuticals, Inc.
MX ˙ BMV ˙ US75886F1075
SecurityMX:REGN / Regeneron Pharmaceuticals, Inc.
InstitutionHrt Financial Lp
Latest Disclosed Ownership19,100 shares
Latest Disclosed Value $ 14,757
Hrt Financial Lp ownership in REGN / Regeneron Pharmaceuticals, Inc.

On May 14, 2026 - Hrt Financial Lp filed a 13F-HR form disclosing ownership of 19,100 shares of Regeneron Pharmaceuticals, Inc. (MX:REGN) valued at $14,757 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 7,600 shares of Regeneron Pharmaceuticals, Inc.. This represents a change in shares of 151.32% during the quarter.

Hrt Financial Lp 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 19,100 of underlying shares valued at $14,757 USD and put options representing 11,300 of underlying shares valued at $8,119 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)
2026-05-14 2026-03-31 13F REGENERON PHARMACEUTICALS CALL 75886F907 19,100 11,500 151.32 15 180.00 0.0368
2026-02-12 2025-12-31 13F REGENERON PHARMACEUTICALS CALL 75886F907 7,600 7,000 1,166.67 6 -90.91 0.0185
2025-11-14 2025-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 98,849 78,225 379.29 56 450.00 0.2043
2025-08-14 2025-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 20,624 -2,875 -12.23 11 -28.57 0.0477
2025-05-15 2025-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 23,499 14,967 175.42 15 133.33 0.0943
2025-02-14 2024-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 8,532 4,696 122.42 6 50.00 0.0314
2024-11-12 2024-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 3,836 3,836 4 0.0200
2024-08-12 2024-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -11,058 -100.00 0 -100.00
2024-05-13 2024-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 11,058 4,992 82.29 11 100.00 0.0654
2024-02-09 2023-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 6,066 -4,590 -43.07 5 -37.50 0.0389
2023-11-13 2023-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 10,656 -644 -5.70 9 0.00 0.0874
2023-08-11 2023-06-30 13F REGENERON PHARMACEUTICALS PUT 75886F957 11,300 6,800 151.11 8 166.67 0.0759
2023-05-12 2023-03-31 13F REGENERON PHARMACEUTICALS PUT 75886F957 4,500 4,500 -88.93 4 -89.66 0.0451
2023-05-12 2023-03-31 13F REGENERON PHARMACEUTICALS CALL 75886F907 600 600 0 0.0060
2023-02-10 2022-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 40,648 40,648 29 0.4147
2022-11-14 2022-09-30 13F REGENERON PHARMACEUTICALS PUT 75886F957 0 -700 -100.00 0 -100.00
2022-08-12 2022-06-30 13F REGENERON PHARMACEUTICALS PUT 75886F957 700 700 413 0.0045
2022-02-14 2021-12-31 13F REGENERON PHARMACEUTICALS PUT 75886F957 0 -2,600 -100.00 0 -100.00
2022-02-14 2021-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -2,600 0
2021-11-15 2021-09-30 13F REGENERON PHARMACEUTICALS PUT 75886F957 2,600 -4,300 -62.32 1,573 -51.81 0.0096
2021-11-15 2021-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 17,847 3,896 10,800 0.0658
2021-08-16 2021-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 13,951 7,051 102.19 7,792 138.73 0.0715
2021-05-17 2021-03-31 13F REGENERON PHARMACEUTICALS PUT 75886F957 6,900 6,900 3,264 0.0330
2021-05-17 2021-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 15,707 15,707 7,431 0.0752
2021-02-16 2020-12-31 13F REGENERON PHARMACEUTICALS PUT 75886F957 0 -3,400 -100.00 0 -100.00
2020-11-13 2020-09-30 13F REGENERON PHARMACEUTICALS PUT 75886F957 3,400 3,400 1,903 0.0553
2020-05-15 2020-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -3,815 -100.00 0 -100.00
2020-02-14 2019-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 3,815 1,497 64.58 1,432 122.71 0.0616
2019-11-14 2019-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,318 2,318 643 0.0304
2019-02-15 2018-12-31 13F REGENERON PHARMACEUTICALS PUT 75886F957 0 -2,500 -100.00 0 -100.00
2018-11-15 2018-09-30 13F REGENERON PHARMACEUTICALS PUT 75886F957 2,500 2,500 1,010 0.1574
2018-11-15 2018-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 2,018 2,018 815 0.1270
2018-08-15 2018-06-30 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -1,010 -100.00 0 -100.00
2018-05-14 2018-03-31 13F REGENERON PHARMACEUTICALS COM 75886F107 1,010 1,010 347 0.1660
2016-02-08 2015-12-31 13F REGENERON PHARMACEUTICALS COM 75886F107 0 -1,509 -100.00 0 -100.00
2015-11-12 2015-09-30 13F REGENERON PHARMACEUTICALS COM 75886F107 1,509 1,509 701 0.5984
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
(%)
2026-05-14 2026-03-31 13F REGENERON PHARMACEUTICALS CALL 19,100 151.32 15 180.00 n/a n/a n/a
2026-02-12 2025-12-31 13F REGENERON PHARMACEUTICALS CALL 7,600 1,166.67 6 -90.91 n/a n/a n/a
2023-05-12 2023-03-31 13F REGENERON PHARMACEUTICALS CALL 600 0 n/a n/a n/a
Disclosed Put 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
(%)
2023-08-11 2023-06-30 13F REGENERON PHARMACEUTICALS PUT 11,300 151.11 8 166.67 n/a n/a n/a
2023-05-12 2023-03-31 13F REGENERON PHARMACEUTICALS PUT 4,500 -88.93 4 -89.66 n/a n/a n/a
2022-11-14 2022-09-30 13F REGENERON PHARMACEUTICALS PUT 0 -100.00 0 -100.00 n/a n/a n/a
2022-08-12 2022-06-30 13F REGENERON PHARMACEUTICALS PUT 700 413 n/a n/a n/a
2022-02-14 2021-12-31 13F REGENERON PHARMACEUTICALS PUT 0 -100.00 0 -100.00 n/a n/a n/a
2021-11-15 2021-09-30 13F REGENERON PHARMACEUTICALS PUT 2,600 -62.32 1,573 -51.81 n/a n/a n/a
2021-05-17 2021-03-31 13F REGENERON PHARMACEUTICALS PUT 6,900 3,264 n/a n/a n/a
2021-02-16 2020-12-31 13F REGENERON PHARMACEUTICALS PUT 0 -100.00 0 -100.00 n/a n/a n/a
2020-11-13 2020-09-30 13F REGENERON PHARMACEUTICALS PUT 3,400 1,903 n/a n/a n/a
2019-02-15 2018-12-31 13F REGENERON PHARMACEUTICALS PUT 0 -100.00 0 -100.00 n/a n/a n/a
2018-11-15 2018-09-30 13F REGENERON PHARMACEUTICALS PUT 2,500 1,010 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.