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 | |
|---|---|---|---|---|---|---|
2726
PUT
Labcorp
LH
$24.3B
| $903K | ﹤0.01% |
+3,600
| New | +$956K |
|
|
UNHG
2727
Leverage Shares 2X Long UNH Daily ETF
UNHG
$92.4M
| $903K | ﹤0.01% |
53,779
+10,184
| +23% | +$203K |
|
2728
PUT
Ivanhoe Electric
IE
$1.43B
| $903K | ﹤0.01% |
56,500
-106,300
| -65% | -$1.52M |
|
|
OPLN
2729
CALL
Openlane
OPLN
$4.17B
| $902K | ﹤0.01% |
30,300
-21,400
| -41% | -$579K |
|
2730
WEC Energy
WEC
$37.7B
| $900K | ﹤0.01% |
8,535
-8,878
| -51% | -$983K |
|
2731
PUT
Olema Pharmaceuticals
OLMA
$1.02B
| $900K | ﹤0.01% |
+36,000
| New | +$641K |
|
2732
CALL
Ameresco
AMRC
$1.15B
| $899K | ﹤0.01% |
30,700
+29,000
| +1,706% | +$1.02M |
|
2733
Iovance Biotherapeutics
IOVA
$2.23B
| $898K | ﹤0.01% |
329,063
+46,903
| +17% | +$109K |
|
|
JHG
2734
DELISTED
Janus Henderson
JHG
| $897K | ﹤0.01% |
18,858
+7,901
| +72% | +$350K |
|
2735
CALL
United Natural Foods
UNFI
$3.01B
| $896K | ﹤0.01% |
26,600
-20,700
| -44% | -$770K |
|
2736
Omega Healthcare
OHI
$15.4B
| $895K | ﹤0.01% |
20,176
-20,729
| -51% | -$893K |
|
2737
CALL
SLM Corp
SLM
$4.57B
| $893K | ﹤0.01% |
33,000
+1,100
| +3% | +$30.2K |
|
2738
Brookdale Senior Living
BKD
$3.62B
| $893K | ﹤0.01% |
82,731
+70,381
| +570% | +$692K |
|
|
GRMN
2739
PUT
Garmin
GRMN
$46.9B
| $893K | ﹤0.01% |
4,400
-5,100
| -54% | -$1.11M |
|
2740
PUT
Transportadora de Gas del Sur
TGS
$4.59B
| $892K | ﹤0.01% |
28,700
+5,700
| +25% | +$161K |
|
2741
CALL
McCormick & Company Non-Voting
MKC
$13.4B
| $892K | ﹤0.01% |
13,100
-11,300
| -46% | -$751K |
|
|
HSAI
2742
PUT
Hesai Group
HSAI
$2.29B
| $892K | ﹤0.01% |
39,800
-46,000
| -54% | -$1.01M |
|
2743
PUT
AerCap
AER
$23.9B
| $891K | ﹤0.01% |
6,200
+300
| +5% | +$39.7K |
|
2744
PUT
Franco-Nevada
FNV
$41.4B
| $891K | ﹤0.01% |
4,300
-4,100
| -49% | -$831K |
|
2745
Analog Devices
ADI
$181B
| $891K | ﹤0.01% |
+3,286
| New | +$826K |
|
|
MRSH
2746
Marsh
MRSH
$86.3B
| $891K | ﹤0.01% |
+4,803
| New | +$898K |
|
2747
CALL
iQIYI
IQ
$1.18B
| $890K | ﹤0.01% |
463,700
-529,300
| -53% | -$1.13M |
|
2748
CALL
Structure Therapeutics
GPCR
$3.49B
| $890K | ﹤0.01% |
12,800
-700
| -5% | -$28.6K |
|
2749
CALL
CNX Resources
CNX
$4.85B
| $890K | ﹤0.01% |
24,200
-64,300
| -73% | -$2.3M |
|
2750
CALL
CorMedix
CRMD
$617M
| $890K | ﹤0.01% |
76,500
-43,400
| -36% | -$480K |
|
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.