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 | |
|---|---|---|---|---|---|---|
2026
KLA
KLAC
$275B
| $2.41M | ﹤0.01% |
+38,250
| New | +$2.59M |
|
2027
Centene
CNC
$31.3B
| $2.41M | ﹤0.01% |
+39,766
| New | +$2.48M |
|
2028
PUT
Lear
LEA
$7.19B
| $2.4M | ﹤0.01% |
25,400
-7,700
| -23% | -$767K |
|
2029
BJs Wholesale Club
BJ
$11.9B
| $2.4M | ﹤0.01% |
26,901
+4,888
| +22% | +$442K |
|
2030
PUT
Parsons
PSN
$6.28B
| $2.4M | ﹤0.01% |
26,000
+25,900
| +25,900% | +$2.64M |
|
2031
Global X Uranium ETF
URA
$5.52B
| $2.4M | ﹤0.01% |
89,509
-138,690
| -61% | -$4.24M |
|
2032
BP
BP
$113B
| $2.4M | ﹤0.01% |
81,070
-107,924
| -57% | -$3.24M |
|
2033
PUT
Amkor Technology
AMKR
$16.1B
| $2.39M | ﹤0.01% |
93,100
+60,800
| +188% | +$1.67M |
|
2034
PUT
United Natural Foods
UNFI
$3.01B
| $2.39M | ﹤0.01% |
87,500
+56,200
| +180% | +$1.29M |
|
2035
CenterPoint Energy
CNP
$29.1B
| $2.38M | ﹤0.01% |
75,170
+49,852
| +197% | +$1.54M |
|
2036
PUT
Liberty Media Series A
FWONA
$22.3B
| $2.38M | ﹤0.01% |
+25,700
| New | +$2M |
|
2037
Union Pacific
UNP
$183B
| $2.38M | ﹤0.01% |
10,442
-32,568
| -76% | -$7.71M |
|
2038
PUT
Madrigal Pharmaceuticals
MDGL
$12.6B
| $2.38M | ﹤0.01% |
7,700
-400
| -5% | -$113K |
|
2039
Sable Offshore Corp
SOC
$903M
| $2.37M | ﹤0.01% |
103,668
+48,286
| +87% | +$1.06M |
|
2040
PUT
H&R Block
HRB
$5.18B
| $2.37M | ﹤0.01% |
44,900
-12,200
| -21% | -$717K |
|
|
AMTM
2041
CALL
Amentum Holdings
AMTM
$5.51B
| $2.37M | ﹤0.01% |
+112,700
| New | +$2.91M |
|
2042
CALL
nCino
NCNO
$1.81B
| $2.37M | ﹤0.01% |
70,500
-16,800
| -19% | -$626K |
|
2043
Walmart Inc
WMT
$871B
| $2.37M | ﹤0.01% |
+26,186
| New | +$2.27M |
|
2044
Atlassian
TEAM
$22B
| $2.36M | ﹤0.01% |
+9,717
| New | +$2.23M |
|
2045
PUT
Dolby
DLB
$4.72B
| $2.36M | ﹤0.01% |
30,200
+29,700
| +5,940% | +$2.26M |
|
2046
PUT
PureCycle Technologies
PCT
$1.17B
| $2.35M | ﹤0.01% |
229,800
+93,300
| +68% | +$1.08M |
|
|
DQ
2047
PUT
Daqo New Energy
DQ
$790M
| $2.35M | ﹤0.01% |
121,000
+36,100
| +43% | +$738K |
|
2048
PUT
Alaska Air
ALK
$5.15B
| $2.35M | ﹤0.01% |
36,300
+6,800
| +23% | +$357K |
|
2049
CALL
MSC Industrial Direct
MSM
$7.02B
| $2.35M | ﹤0.01% |
31,400
+5,400
| +21% | +$445K |
|
|
2050
CALL
Parsons
PSN
$6.28B
| $2.34M | ﹤0.01% |
25,400
+1,100
| +5% | +$112K |
|
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.