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 | |
|---|---|---|---|---|---|---|
2326
PUT
Aurora
AUR
$11.7B
| $1.35M | ﹤0.01% |
351,800
-190,400
| -35% | -$872K |
|
2327
CALL
Crown Holdings
CCK
$12.8B
| $1.35M | ﹤0.01% |
13,100
+1,000
| +8% | +$97.4K |
|
2328
Vodafone
VOD
$34.9B
| $1.35M | ﹤0.01% |
+101,952
| New | +$1.23M |
|
2329
Becton Dickinson
BDX
$43.1B
| $1.34M | ﹤0.01% |
+6,923
| New | +$1.32M |
|
2330
PUT
The GEO Group
GEO
$4.13B
| $1.34M | ﹤0.01% |
83,300
-200,600
| -71% | -$3.34M |
|
2331
Eastman Chemical
EMN
$7.8B
| $1.34M | ﹤0.01% |
21,017
+17,893
| +573% | +$1.1M |
|
2332
PUT
WIX.com
WIX
$2.15B
| $1.34M | ﹤0.01% |
12,900
-22,200
| -63% | -$2.68M |
|
2333
CALL
Emergent Biosolutions
EBS
$375M
| $1.34M | ﹤0.01% |
108,400
+60,400
| +126% | +$647K |
|
2334
CALL
UWM Holdings
UWMC
$621M
| $1.34M | ﹤0.01% |
305,400
-242,300
| -44% | -$1.3M |
|
2335
CALL
Compass Diversified
CODI
$755M
| $1.34M | ﹤0.01% |
278,300
+176,500
| +173% | +$1.12M |
|
2336
Rayonier Advanced Materials
RYAM
$565M
| $1.34M | ﹤0.01% |
226,678
+90,647
| +67% | +$589K |
|
2337
PUT
Molson Coors Class B
TAP
$7.68B
| $1.34M | ﹤0.01% |
28,600
+11,200
| +64% | +$517K |
|
2338
PUT
Signet Jewelers
SIG
$3.55B
| $1.33M | ﹤0.01% |
16,100
+1,000
| +7% | +$95K |
|
2339
T-Rex 2X Long NVIDIA Daily Target ETF
NVDX
$461M
| $1.33M | ﹤0.01% |
+77,898
| New | +$1.43M |
|
2340
Mercury Insurance
MCY
$5.94B
| $1.33M | ﹤0.01% |
14,164
-13,238
| -48% | -$1.15M |
|
2341
CALL
Acuity Brands
AYI
$9.88B
| $1.33M | ﹤0.01% |
3,700
+1,400
| +61% | +$506K |
|
2342
CALL
Urban Outfitters
URBN
$5.99B
| $1.33M | ﹤0.01% |
17,700
-23,500
| -57% | -$1.66M |
|
2343
CALL
Reservoir Media
RSVR
$700M
| $1.33M | ﹤0.01% |
175,900
+115,800
| +193% | +$868K |
|
2344
PUT
VICI Properties
VICI
$29.4B
| $1.33M | ﹤0.01% |
47,300
-20,500
| -30% | -$609K |
|
2345
CALL
Richtech Robotics
RR
$347M
| $1.33M | ﹤0.01% |
411,700
-212,100
| -34% | -$938K |
|
2346
Fluor
FLR
$7.29B
| $1.33M | ﹤0.01% |
33,546
+18,023
| +116% | +$797K |
|
2347
Rio Tinto
RIO
$148B
| $1.33M | ﹤0.01% |
16,600
-45,800
| -73% | -$3.3M |
|
2348
CALL
Rithm Capital
RITM
$5.09B
| $1.33M | ﹤0.01% |
121,800
+5,700
| +5% | +$63K |
|
2349
CALL
Vanguard S&P 500 Growth ETF
VOOG
$25.4B
| $1.33M | ﹤0.01% |
31,800
+2,400
| +8% | +$177K |
|
2350
PUT
JFrog
FROG
$9.71B
| $1.32M | ﹤0.01% |
21,200
+4,200
| +25% | +$239K |
|
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.