Catalyst Pharmaceuticals, Inc.
US ˙ NasdaqCM ˙ US14888U1016

SecurityCPRX / Catalyst Pharmaceuticals, Inc.
InstitutionEngineers Gate Manager LP
Latest Disclosed Ownership67,061 shares
Latest Disclosed Value $ 1,660,430
Engineers Gate Manager LP reports 39.31% increase in ownership of CPRX / Catalyst Pharmaceuticals, Inc.

On May 15, 2026 - Engineers Gate Manager LP filed a 13F-HR form disclosing ownership of 67,061 shares of Catalyst Pharmaceuticals, Inc. (US:CPRX) valued at $1,660,430 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 48,139 shares of Catalyst Pharmaceuticals, Inc.. This represents a change in shares of 39.31% during the quarter. The current value of the position is $2,097,668 USD.

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.

Upgrade to unlock premium data and export to Excel .

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 CATALYST PHARMACEUTICALS COM 14888U101 67,061 18,922 39.31 1,660 47.82 0.0208
2026-02-17 2025-12-31 13F CATALYST PHARMACEUTICALS COM 14888U101 48,139 -95,525 -66.49 1,124 -60.32 0.0133
2025-11-14 2025-09-30 13F CATALYST PHARMACEUTICALS COM 14888U101 143,664 87,522 155.89 2,830 132.35 0.0324
2025-08-14 2025-06-30 13F CATALYST PHARMACEUTICALS COM 14888U101 56,142 56,142 1,218 0.0152
2025-05-15 2025-03-31 13F CATALYST PHARMACEUTICALS COM 14888U101 0 -42,737 -100.00 0 -100.00
2025-02-14 2024-12-31 13F CATALYST PHARMACEUTICALS COM 14888U101 42,737 -4,159 -8.87 892 -4.40 0.0155
2024-11-14 2024-09-30 13F CATALYST PHARMACEUTICALS COM 14888U101 46,896 -39,652 -45.82 932 -30.45 0.0182
2024-08-14 2024-06-30 13F CATALYST PHARMACEUTICALS COM 14888U101 86,548 -60,407 -41.11 1,341 -42.78 0.0302
2024-05-15 2024-03-31 13F CATALYST PHARMACEUTICALS COM 14888U101 146,955 146,955 2,342 0.0617
2024-02-14 2023-12-31 13F CATALYST PHARMACEUTICALS COM 14888U101 0 -102,731 -100.00 0 -100.00
2023-11-14 2023-09-30 13F CATALYST PHARMACEUTICALS COM 14888U101 102,731 102,731 1,201 0.0444
2023-08-14 2023-06-30 13F CATALYST PHARMACEUTICALS COM 14888U101 0 -26,011 -100.00 0 -100.00
2023-05-15 2023-03-31 13F CATALYST PHARMACEUTICALS COM 14888U101 26,011 26,011 431 0.0180
2023-02-14 2022-12-31 13F CATALYST PHARMACEUTICALS COM 14888U101 0 -38,274 -100.00 0 -100.00
2022-11-14 2022-09-30 13F CATALYST PHARMACEUTICALS COM 14888U101 38,274 -21,965 -36.46 491 16.35 0.0305
2022-08-15 2022-06-30 13F CATALYST PHARMACEUTICALS COM 14888U101 60,239 18,794 45.35 422 22.67 0.0155
2022-05-16 2022-03-31 13F CATALYST PHARMACEUTICALS COM 14888U101 41,445 41,445 344 0.0135
2022-02-14 2021-12-31 13F CATALYST PHARMACEUTICALS COM 14888U101 0 -15,395 -100.00 0 -100.00
2021-11-15 2021-09-30 13F CATALYST PHARMACEUTICALS COM 14888U101 15,395 -30,708 -66.61 82 -69.06 0.0047
2021-08-16 2021-06-30 13F CATALYST PHARMACEUTICALS COM 14888U101 46,103 -9,963 -17.77 265 2.71 0.0170
2021-05-17 2021-03-31 13F CATALYST PHARMACEUTICALS COM 14888U101 56,066 42,870 324.87 258 486.36 0.0128
2021-02-16 2020-12-31 13F CATALYST PHARMACEUTICALS COM 14888U101 13,196 -208,162 -94.04 44 -93.30 0.0019
2020-11-16 2020-09-30 13F CATALYST PHARMACEUTICALS COM 14888U101 221,358 221,358 657 0.0308
2015-08-14 2015-06-30 13F CATALYST PHARM PARTNERS COM 14888U101 0 -14,882 -100.00 0 -100.00
2015-05-15 2015-03-31 13F CATALYST PHARM PARTNERS COM 14888U101 14,882 14,882 64 0.0085
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.