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 |
Amazon
AMZN
|
+$113M |
| 2 |
SPDR Gold Trust
GLD
|
+$68.6M |
| 3 |
NVIDIA
NVDA
|
+$63.4M |
| 4 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$55.2M |
| 5 |
Apple
AAPL
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Netflix
NFLX
|
+$27.1M |
| 2 |
Qualcomm
QCOM
|
+$24.6M |
| 3 |
Walt Disney
DIS
|
+$21.2M |
| 4 |
Advanced Micro Devices
AMD
|
+$18.2M |
| 5 |
Snowflake
SNOW
|
+$16.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.44% |
| 2 | Consumer Discretionary | 0.32% |
| 3 | Healthcare | 0.22% |
| 4 | Financials | 0.17% |
| 5 | Communication Services | 0.15% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
ETNB
2901
PUT
DELISTED
89bio
ETNB
| $795K | ﹤0.01% |
51,500
-58,200
| -53% | -$977K |
|
2902
CALL
Global Ship Lease
GSL
$1.57B
| $795K | ﹤0.01% |
43,400
+4,300
| +11% | +$83.9K |
|
2903
CALL
Jefferies Financial Group
JEF
$12.9B
| $795K | ﹤0.01% |
22,800
-7,400
| -25% | -$265K |
|
2904
CALL
Fortuna Silver Mines
FSM
$2.6B
| $794K | ﹤0.01% |
292,200
+236,000
| +420% | +$740K |
|
2905
PUT
Shoals Technologies Group
SHLS
$1.54B
| $792K | ﹤0.01% |
43,400
-8,800
| -17% | -$196K |
|
2906
Xcel Energy
XEL
$50.5B
| $792K | ﹤0.01% |
13,844
-14,624
| -51% | -$879K |
|
|
ETNB
2907
CALL
DELISTED
89bio
ETNB
| $790K | ﹤0.01% |
51,200
+24,500
| +92% | +$411K |
|
2908
Vulcan Materials
VMC
$36.8B
| $790K | ﹤0.01% |
+3,915
| New | +$852K |
|
2909
PUT
Clear Secure
YOU
$5.39B
| $790K | ﹤0.01% |
41,500
-101,600
| -71% | -$2.25M |
|
2910
CALL
Cathay General Bancorp
CATY
$4.21B
| $789K | ﹤0.01% |
22,700
+15,400
| +211% | +$550K |
|
2911
CALL
Genworth Financial
GNW
$3.81B
| $789K | ﹤0.01% |
134,700
-600
| -0.4% | -$3.46K |
|
2912
PUT
MINISO
MNSO
$3.73B
| $789K | ﹤0.01% |
30,500
+4,100
| +16% | +$91.3K |
|
2913
CleanSpark
CLSK
$3.59B
| $788K | ﹤0.01% |
206,952
+85,318
| +70% | +$451K |
|
|
AMAM
2914
DELISTED
Ambrx Biopharma Inc
AMAM
| $788K | ﹤0.01% |
68,551
+61,917
| +933% | +$843K |
|
2915
Core & Main
CNM
$8.05B
| $787K | ﹤0.01% |
+27,283
| New | +$842K |
|
2916
CALL
Patterson-UTI
PTEN
$3.7B
| $787K | ﹤0.01% |
56,900
+43,200
| +315% | +$632K |
|
2917
PUT
West Pharmaceutical
WST
$23B
| $787K | ﹤0.01% |
2,100
+1,400
| +200% | +$541K |
|
2918
PUT
Prosperity Bancshares
PB
$8.77B
| $785K | ﹤0.01% |
14,400
-200
| -1% | -$11.6K |
|
2919
PUT
Westlake Corp
WLK
$9.3B
| $785K | ﹤0.01% |
6,300
+900
| +17% | +$116K |
|
2920
Global E Online
GLBE
$6.39B
| $784K | ﹤0.01% |
+19,746
| New | +$795K |
|
|
VSTO
2921
CALL
DELISTED
Vista Outdoor Inc.
VSTO
| $784K | ﹤0.01% |
23,700
-900
| -4% | -$26.5K |
|
2922
CALL
Cirrus Logic
CRUS
$6.81B
| $783K | ﹤0.01% |
10,600
-85,500
| -89% | -$6.68M |
|
2923
CALL
Helix Energy Solutions
HLX
$1.44B
| $783K | ﹤0.01% |
70,100
+28,900
| +70% | +$278K |
|
2924
CALL
Ecopetrol
EC
$32.7B
| $782K | ﹤0.01% |
67,600
-15,100
| -18% | -$173K |
|
2925
CALL
FirstCash
FCFS
$8.87B
| $782K | ﹤0.01% |
+7,800
| New | +$737K |
|
Similar funds
Simplex Trading's Q3 2023 Portfolio in Review
As of Q3 2023, Simplex Trading held 10,417 positions worth $127B, up 4.5% from $122B the previous quarter. Its ten largest holdings account for 44% of the portfolio.
Simplex Trading deployed $11.9B of net new capital in Q3 2023, opening 1,399 new positions and adding to 3,690 existing holdings. Its largest new stake was Amazon: 841,102 shares worth $107M.
By sector, the portfolio is most concentrated in Technology at 0.44% of assets, up from 0.41% a quarter earlier, followed by Consumer Discretionary and Healthcare.
On the sell side, the largest reduction was Netflix, an estimated $27.1M trimmed.
- Simplex Trading's largest Q3 2023 buy was Amazon: 841,102 shares worth $107M.
- Simplex Trading added most to SPDR Gold Trust in Q3 2023, an estimated $68.6M increase.
- Simplex Trading's biggest Q3 2023 reduction was Netflix, cutting an estimated $27.1M.
- Simplex Trading fully exited Qualcomm in Q3 2023, selling an estimated $24.6M.
- Simplex Trading's ten largest holdings make up 44% of its $127B portfolio in Q3 2023.
- Simplex Trading opened 1,399 new positions and closed 1,719 in Q3 2023.
- Simplex Trading's portfolio value rose 4.5% quarter-over-quarter to $127B.
Based on Simplex Trading's 13F filing for Q3 2023, filed 1 Nov 2023.