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 | |
|---|---|---|---|---|---|---|
1701
CALL
Bloom Energy
BE
$52.6B
| $3.1M | ﹤0.01% |
233,500
+32,100
| +16% | +$503K |
|
1702
PUT
NetEase
NTES
$76.5B
| $3.09M | ﹤0.01% |
30,900
-44,800
| -59% | -$4.59M |
|
|
WRK
1703
CALL
DELISTED
WestRock Company
WRK
| $3.09M | ﹤0.01% |
86,300
-12,400
| -13% | -$407K |
|
|
HOLX
1704
PUT
DELISTED
Hologic
HOLX
| $3.09M | ﹤0.01% |
44,500
+20,800
| +88% | +$1.57M |
|
1705
CALL
Constellation Energy
CEG
$98B
| $3.09M | ﹤0.01% |
28,300
-4,500
| -14% | -$464K |
|
1706
CALL
STMicroelectronics
STM
$46B
| $3.08M | ﹤0.01% |
71,500
+12,900
| +22% | +$616K |
|
1707
CALL
Invesco DB Base Metals Fund
DBB
$306M
| $3.08M | ﹤0.01% |
146,700
+82,700
| +129% | +$1.52M |
|
1708
CALL
Arthur J. Gallagher & Co
AJG
$63.7B
| $3.08M | ﹤0.01% |
13,500
-23,500
| -64% | -$5.26M |
|
1709
CALL
Textron
TXT
$16.6B
| $3.07M | ﹤0.01% |
39,300
-8,000
| -17% | -$596K |
|
1710
PUT
Corning
GLW
$126B
| $3.07M | ﹤0.01% |
100,700
-32,100
| -24% | -$1.05M |
|
1711
CALL
Sempra
SRE
$60.8B
| $3.07M | ﹤0.01% |
45,100
-48,100
| -52% | -$3.47M |
|
|
GAP
1712
CALL
The Gap Inc
GAP
$6.84B
| $3.07M | ﹤0.01% |
288,600
+22,500
| +8% | +$229K |
|
1713
PUT
Planet Fitness
PLNT
$4.23B
| $3.06M | ﹤0.01% |
62,200
-17,700
| -22% | -$1.07M |
|
1714
PUT
Cognizant
CTSH
$21.5B
| $3.06M | ﹤0.01% |
45,100
+6,000
| +15% | +$414K |
|
1715
CALL
AppFolio
APPF
$5.85B
| $3.05M | ﹤0.01% |
+16,700
| New | +$3.03M |
|
1716
CALL
Globant
GLOB
$1.35B
| $3.05M | ﹤0.01% |
15,400
+3,800
| +33% | +$712K |
|
1717
CALL
Vanguard Emerging Markets Government Bond ETF
VWOB
$6.15B
| $3.05M | ﹤0.01% |
29,800
-2,600
| -8% | -$159K |
|
1718
CALL
BlackBerry
BB
$5.01B
| $3.04M | ﹤0.01% |
645,700
+267,100
| +71% | +$1.31M |
|
1719
CALL
Nano X Imaging
NNOX
$62.4M
| $3.04M | ﹤0.01% |
463,500
+362,100
| +357% | +$3.72M |
|
1720
PUT
Boston Beer
SAM
$1.88B
| $3.04M | ﹤0.01% |
7,800
+500
| +7% | +$175K |
|
1721
PUT
Yeti Holdings
YETI
$3.82B
| $3.04M | ﹤0.01% |
63,000
+22,600
| +56% | +$1.01M |
|
1722
CALL
DaVita
DVA
$15.1B
| $3.03M | ﹤0.01% |
32,100
+16,500
| +106% | +$1.68M |
|
1723
CALL
Trump Media & Technology Group
DJT
$2.37B
| $3.03M | ﹤0.01% |
184,800
+105,500
| +133% | +$1.64M |
|
1724
PUT
Freshpet
FRPT
$2.83B
| $3.03M | ﹤0.01% |
46,000
-13,100
| -22% | -$940K |
|
1725
CALL
LegalZoom.com
LZ
$1.23B
| $3.03M | ﹤0.01% |
276,800
-20,100
| -7% | -$246K |
|
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.