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 |
Netflix
NFLX
|
+$73.1M |
| 2 |
Western Digital
WDC
|
+$51.8M |
| 3 |
iShares Semiconductor ETF
SOXX
|
+$46M |
| 4 |
Meta Platforms (Facebook)
META
|
+$41.8M |
| 5 |
Alibaba
BABA
|
+$37.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$262M |
| 2 |
Microsoft
MSFT
|
+$194M |
| 3 |
iShares Russell 2000 ETF
IWM
|
+$149M |
| 4 |
Apple
AAPL
|
+$119M |
| 5 |
Amazon
AMZN
|
+$107M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.59% |
| 2 | Consumer Discretionary | 0.21% |
| 3 | Healthcare | 0.2% |
| 4 | Industrials | 0.18% |
| 5 | Communication Services | 0.16% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2126
VF Corp
VFC
$6.68B
| $1.67M | ﹤0.01% |
92,499
+55,094
| +147% | +$893K |
|
2127
PUT
Ventas
VTR
$48.9B
| $1.67M | ﹤0.01% |
21,600
-23,000
| -52% | -$1.73M |
|
|
FIG
2128
Figma
FIG
$11.2B
| $1.67M | ﹤0.01% |
+44,712
| New | +$2.02M |
|
2129
PUT
International Paper
IP
$22.3B
| $1.67M | ﹤0.01% |
42,400
+20,000
| +89% | +$822K |
|
2130
PUT
Bruker
BRKR
$9.2B
| $1.67M | ﹤0.01% |
35,400
-29,500
| -45% | -$1.25M |
|
2131
CALL
Molina Healthcare
MOH
$10.3B
| $1.67M | ﹤0.01% |
9,600
-18,800
| -66% | -$3.09M |
|
2132
PUT
Boyd Gaming
BYD
$6.47B
| $1.66M | ﹤0.01% |
19,500
-9,800
| -33% | -$808K |
|
2133
PUT
A.O. Smith
AOS
$8.38B
| $1.66M | ﹤0.01% |
24,800
+20,500
| +477% | +$1.39M |
|
|
TERN
2134
CALL
DELISTED
Terns Pharmaceuticals
TERN
| $1.66M | ﹤0.01% |
41,000
-28,300
| -41% | -$654K |
|
2135
Carvana
CVNA
$43.3B
| $1.66M | ﹤0.01% |
+19,615
| New | +$1.46M |
|
|
EMBJ
2136
PUT
Embraer S.A. ADS
EMBJ
$11.6B
| $1.65M | ﹤0.01% |
25,700
-24,300
| -49% | -$1.52M |
|
2137
Elastic
ESTC
$6.1B
| $1.65M | ﹤0.01% |
21,914
+16,930
| +340% | +$1.38M |
|
|
NTSK
2138
CALL
Netskope Inc
NTSK
$4.66B
| $1.65M | ﹤0.01% |
94,200
+81,200
| +625% | +$1.69M |
|
2139
Core Scientific
CORZ
$7.23B
| $1.65M | ﹤0.01% |
113,217
-120,653
| -52% | -$2.1M |
|
2140
PUT
Sunoco
SUN
$14.2B
| $1.65M | ﹤0.01% |
31,400
-1,000
| -3% | -$52.8K |
|
2141
PUT
FMC
FMC
$1.42B
| $1.64M | ﹤0.01% |
118,200
+47,900
| +68% | +$913K |
|
2142
PUT
PPG Industries
PPG
$25.9B
| $1.64M | ﹤0.01% |
16,000
-13,300
| -45% | -$1.34M |
|
2143
PUT
BridgeBio Pharma
BBIO
$16.5B
| $1.64M | ﹤0.01% |
21,400
-18,400
| -46% | -$1.21M |
|
2144
CALL
Ryan Specialty Holdings
RYAN
$5.41B
| $1.64M | ﹤0.01% |
31,700
+30,600
| +2,782% | +$1.68M |
|
2145
CALL
Blackstone Mortgage Trust
BXMT
$2.82B
| $1.64M | ﹤0.01% |
85,500
-9,600
| -10% | -$182K |
|
2146
CALL
Innovative Industrial Properties
IIPR
$1.78B
| $1.63M | ﹤0.01% |
34,500
-3,300
| -9% | -$171K |
|
2147
PUT
JB Hunt Transport Services
JBHT
$27.1B
| $1.63M | ﹤0.01% |
8,400
+4,900
| +140% | +$841K |
|
2148
Builders FirstSource
BLDR
$7.84B
| $1.63M | ﹤0.01% |
15,860
-8,080
| -34% | -$908K |
|
2149
Winnebago Industries
WGO
$870M
| $1.63M | ﹤0.01% |
40,245
+19,109
| +90% | +$697K |
|
|
AEVA
2150
CALL
Aeva Technologies
AEVA
$1.02B
| $1.63M | ﹤0.01% |
122,500
+18,200
| +17% | +$259K |
|
Similar funds
Simplex Trading's Q4 2025 Portfolio in Review
As of Q4 2025, Simplex Trading held 10,526 positions worth $177B, down 9% from $195B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading withdrew a net $23.2B in Q4 2025, closing 2,184 positions and reducing 4,088 holdings. Its most notable exit was iShares Russell 2000 ETF, an estimated $149M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.59% of assets, down from 0.79% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in Western Digital worth $58.9M.
- Simplex Trading's largest Q4 2025 buy was Western Digital: 341,762 shares worth $58.9M.
- Simplex Trading added most to Netflix in Q4 2025, an estimated $73.1M increase.
- Simplex Trading's biggest Q4 2025 reduction was NVIDIA, cutting an estimated $262M.
- Simplex Trading fully exited iShares Russell 2000 ETF in Q4 2025, selling an estimated $149M.
- Simplex Trading's ten largest holdings make up 49% of its $177B portfolio in Q4 2025.
- Simplex Trading opened 1,476 new positions and closed 2,184 in Q4 2025.
- Simplex Trading's portfolio value fell 9% quarter-over-quarter to $177B.
Based on Simplex Trading's 13F filing for Q4 2025, filed 11 Feb 2026.