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 | |
|---|---|---|---|---|---|---|
5626
PUT
Cambria Tail Risk ETF
TAIL
$147M
| $61K | ﹤0.01% |
1,000
+900
| +900% | +$11.9K |
|
5627
CALL
Taysha Gene Therapies
TSHA
$1.68B
| $61K | ﹤0.01% |
+19,600
| New | +$36.6K |
|
5628
Expro Ltd
XPRO
$1.79B
| $61K | ﹤0.01% |
2,633
+1,749
| +198% | +$39.4K |
|
5629
PUT
Atlas Energy Solutions
AESI
$1.35B
| $60K | ﹤0.01% |
2,700
+2,200
| +440% | +$46K |
|
5630
Beam Global
BEEM
$23.3M
| $60K | ﹤0.01% |
8,210
-1,995
| -20% | -$18.7K |
|
|
SRTA
5631
CALL
Strata Critical Medical Inc
SRTA
$434M
| $60K | ﹤0.01% |
23,400
-2,200
| -9% | -$7.73K |
|
|
BRSP
5632
CALL
BrightSpire Capital
BRSP
$634M
| $60K | ﹤0.01% |
+9,600
| New | +$65.7K |
|
5633
PUT
Future Fuel
FF
$217M
| $60K | ﹤0.01% |
8,400
+7,100
| +546% | +$58.1K |
|
5634
CGI
GIB
$15.1B
| $60K | ﹤0.01% |
+610
| New | +$62.3K |
|
5635
CALL
Inovio Pharmaceuticals
INO
$55.7M
| $60K | ﹤0.01% |
13,042
+175
| +1% | +$967 |
|
5636
Mirion Technologies
MIR
$3.73B
| $60K | ﹤0.01% |
+8,053
| New | +$63.5K |
|
|
HTT
5637
PUT
High Templar Tech Ltd
HTT
$379M
| $60K | ﹤0.01% |
28,500
+16,700
| +142% | +$36.8K |
|
|
RENT
5638
Rent the Runway
RENT
$121M
| $60K | ﹤0.01% |
4,415
+2,128
| +93% | +$60.6K |
|
5639
CALL
Webster Financial
WBS
$12.5B
| $60K | ﹤0.01% |
1,500
-3,800
| -72% | -$162K |
|
5640
Abeona Therapeutics
ABEO
$366M
| $59K | ﹤0.01% |
14,128
+13,418
| +1,890% | +$50.8K |
|
5641
PUT
Alpha and Omega Semiconductor
AOSL
$950M
| $59K | ﹤0.01% |
2,000
-33,700
| -94% | -$1.05M |
|
|
BRY
5642
CALL
DELISTED
Berry Corp
BRY
| $59K | ﹤0.01% |
7,300
-3,400
| -32% | -$27.3K |
|
5643
Enphase Energy
ENPH
$4.96B
| $59K | ﹤0.01% |
+496
| New | +$70.7K |
|
5644
Grid Dynamics Holdings
GDYN
$559M
| $59K | ﹤0.01% |
+4,925
| New | +$54.6K |
|
5645
PUT
IDEAYA Biosciences
IDYA
$3.42B
| $59K | ﹤0.01% |
2,200
-88,800
| -98% | -$2.25M |
|
|
LAND
5646
CALL
Gladstone Land Corp
LAND
$350M
| $59K | ﹤0.01% |
4,200
+100
| +2% | +$1.59K |
|
5647
CALL
Orion
OEC
$381M
| $59K | ﹤0.01% |
2,800
-60,300
| -96% | -$1.32M |
|
5648
PUT
Sanmina
SANM
$9.95B
| $59K | ﹤0.01% |
1,100
-7,200
| -87% | -$405K |
|
5649
CALL
Smith & Nephew
SNN
$13.3B
| $59K | ﹤0.01% |
2,400
-2,900
| -55% | -$81.4K |
|
5650
CALL
Simpson Manufacturing
SSD
$7.72B
| $59K | ﹤0.01% |
400
-1,000
| -71% | -$152K |
|
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.