Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$552M |
| 2 |
Strategy Inc
MSTR
|
+$85.8M |
| 3 |
MSTX
Defiance Daily Target 2x Long MSTR ETF
MSTX
|
+$48.1M |
| 4 |
Intel
INTC
|
+$45.4M |
| 5 |
Uber
UBER
|
+$43M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$133M |
| 2 |
Pinduoduo
PDD
|
+$82.6M |
| 3 |
Boeing
BA
|
+$49.8M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$45.1M |
| 5 |
Microsoft
MSFT
|
+$41M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.68% |
| 2 | Consumer Discretionary | 0.23% |
| 3 | Healthcare | 0.19% |
| 4 | Financials | 0.13% |
| 5 | Communication Services | 0.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
6801
GeoPark
GPRK
$609M
| $17K | ﹤0.01% |
1,912
-6,423
| -77% | -$57.1K |
|
|
GRID
6802
First Trust NASDAQ Clean Edge Smart Grid Infrastructure Index Fund
GRID
$10.8B
| $17K | ﹤0.01% |
+150
| New | +$18.7K |
|
6803
PUT
Garrett Motion
GTX
$5.37B
| $17K | ﹤0.01% |
1,900
-2,300
| -55% | -$19.1K |
|
6804
Inhibrx
INBX
$1.16B
| $17K | ﹤0.01% |
1,147
-1,003
| -47% | -$15.3K |
|
6805
CALL
inTEST
INTT
$143M
| $17K | ﹤0.01% |
2,000
-2,100
| -51% | -$15.9K |
|
|
JFIN
6806
CALL
Jiayin Group
JFIN
$115M
| $17K | ﹤0.01% |
2,700
+2,500
| +1,250% | +$16.7K |
|
6807
James River Group Holdings
JRVR
$219M
| $17K | ﹤0.01% |
3,649
-26,771
| -88% | -$147K |
|
6808
iShares MSCI Saudi Arabia ETF
KSA
$612M
| $17K | ﹤0.01% |
+428
| New | +$17.8K |
|
6809
LeMaitre Vascular
LMAT
$2.37B
| $17K | ﹤0.01% |
+194
| New | +$18.7K |
|
6810
PUT
NewtekOne
NEWT
$426M
| $17K | ﹤0.01% |
1,400
-5,400
| -79% | -$73.2K |
|
6811
CALL
Napco Security Technologies
NSSC
$1.3B
| $17K | ﹤0.01% |
500
-3,400
| -87% | -$130K |
|
|
6812
PUT
Napco Security Technologies
NSSC
$1.3B
| $17K | ﹤0.01% |
500
-4,700
| -90% | -$180K |
|
6813
PUT
Ocugen
OCGN
$403M
| $17K | ﹤0.01% |
21,500
+100
| +0.5% | +$92 |
|
6814
PUT
Omnicell
OMCL
$1.88B
| $17K | ﹤0.01% |
400
| – | – |
|
6815
PUT
Pampa Energía
PAM
$4.57B
| $17K | ﹤0.01% |
200
-9,400
| -98% | -$714K |
|
6816
CALL
Protalix BioTherapeutics
PLX
$183M
| $17K | ﹤0.01% |
+9,200
| New | +$13K |
|
|
RNAM
6817
PUT
DELISTED
Avidity Biosciences
RNAM
| $17K | ﹤0.01% |
600
-1,400
| -70% | -$58.5K |
|
6818
ProShares Ultra Technology
ROM
$1.01B
| $17K | ﹤0.01% |
+251
| New | +$17.7K |
|
6819
PUT
Seanergy Maritime Holdings
SHIP
$349M
| $17K | ﹤0.01% |
2,500
-200
| -7% | -$1.8K |
|
6820
PUT
Teleflex
TFX
$5.96B
| $17K | ﹤0.01% |
100
| – | – |
|
|
UDMY
6821
PUT
DELISTED
Udemy
UDMY
| $17K | ﹤0.01% |
2,100
-2,200
| -51% | -$17.7K |
|
6822
Virco
VIRC
$94.8M
| $17K | ﹤0.01% |
1,697
-10,761
| -86% | -$151K |
|
6823
PUT
Xometry
XMTR
$4.47B
| $17K | ﹤0.01% |
400
-4,600
| -92% | -$130K |
|
6824
Expro Ltd
XPRO
$1.64B
| $17K | ﹤0.01% |
+1,434
| New | +$20K |
|
6825
CALL
Q32 Bio
QTTB
$435M
| $17K | ﹤0.01% |
+5,200
| New | +$164K |
|
Similar funds
Simplex Trading's Q4 2024 Portfolio in Review
As of Q4 2024, Simplex Trading held 10,008 positions worth $179B, up 4.8% from $170B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading's Q4 2024 filing shows 1,520 new, 3,222 increased, 3,616 reduced and 1,504 closed positions. Its largest new stake was Strategy Inc: 285,022 shares worth $82.5M. The largest sale was NVIDIA, an estimated $133M.
By sector, the portfolio is most concentrated in Technology at 0.68% of assets, up from 0.4% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q4 2024 buy was Strategy Inc: 285,022 shares worth $82.5M.
- Simplex Trading added most to Apple in Q4 2024, an estimated $552M increase.
- Simplex Trading's biggest Q4 2024 reduction was NVIDIA, cutting an estimated $133M.
- Simplex Trading fully exited Pinduoduo in Q4 2024, selling an estimated $82.6M.
- Simplex Trading's ten largest holdings make up 49% of its $179B portfolio in Q4 2024.
- Simplex Trading opened 1,520 new positions and closed 1,504 in Q4 2024.
- Simplex Trading's portfolio value rose 4.8% quarter-over-quarter to $179B.
Based on Simplex Trading's 13F filing for Q4 2024, filed 11 Feb 2025.