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 | |
|---|---|---|---|---|---|---|
|
EDR
1776
DELISTED
Endeavor Group Holdings, Inc.
EDR
| $2.89M | ﹤0.01% |
145,158
+132,550
| +1,051% | +$3.04M |
|
1777
PUT
Autoliv
ALV
$8.6B
| $2.88M | ﹤0.01% |
29,900
-21,300
| -42% | -$2.04M |
|
1778
CALL
Baxter International
BAX
$11.6B
| $2.88M | ﹤0.01% |
76,200
-27,400
| -26% | -$1.17M |
|
|
GTLS
1779
CALL
DELISTED
Chart Industries
GTLS
| $2.88M | ﹤0.01% |
17,000
-4,000
| -19% | -$673K |
|
1780
PUT
Vornado Realty Trust
VNO
$7.47B
| $2.88M | ﹤0.01% |
126,800
-97,300
| -43% | -$2.15M |
|
1781
PUT
First Majestic Silver
AG
$8.05B
| $2.87M | ﹤0.01% |
559,500
+172,900
| +45% | +$1.03M |
|
|
IMGN
1782
PUT
DELISTED
Immunogen Inc
IMGN
| $2.86M | ﹤0.01% |
180,200
-73,600
| -29% | -$1.22M |
|
1783
Sarepta Therapeutics
SRPT
$1.66B
| $2.85M | ﹤0.01% |
23,559
-12,276
| -34% | -$1.39M |
|
1784
PUT
Tower Semiconductor
TSEM
$26.4B
| $2.85M | ﹤0.01% |
116,100
+82,900
| +250% | +$2.66M |
|
|
EXAS
1785
PUT
DELISTED
Exact Sciences
EXAS
| $2.84M | ﹤0.01% |
41,700
-56,400
| -57% | -$4.79M |
|
1786
CALL
Alexandria Real Estate Equities
ARE
$8.88B
| $2.84M | ﹤0.01% |
28,400
-23,900
| -46% | -$2.78M |
|
1787
CALL
nCino
NCNO
$1.81B
| $2.84M | ﹤0.01% |
89,400
+81,300
| +1,004% | +$2.51M |
|
1788
PUT
Medallion Financial
MFIN
$226M
| $2.84M | ﹤0.01% |
404,600
+403,900
| +57,700% | +$3.34M |
|
1789
PUT
Itaú Unibanco
ITUB
$91.3B
| $2.84M | ﹤0.01% |
598,677
+28,551
| +5% | +$142K |
|
|
DQ
1790
Daqo New Energy
DQ
$790M
| $2.83M | ﹤0.01% |
93,491
+62,893
| +206% | +$2.24M |
|
1791
Keurig Dr Pepper
KDP
$40.4B
| $2.83M | ﹤0.01% |
89,574
+22,925
| +34% | +$756K |
|
|
JPGE
1792
CALL
DELISTED
JPMorgan Diversified Return Global Equity ETF
JPGE
| $2.83M | ﹤0.01% |
52,800
-39,500
| -43% | -$2.11M |
|
1793
CALL
Perion Network
PERI
$367M
| $2.82M | ﹤0.01% |
92,200
+44,600
| +94% | +$1.5M |
|
1794
CALL
Rocket Companies
RKT
$36.9B
| $2.82M | ﹤0.01% |
345,300
-52,500
| -13% | -$531K |
|
|
PPLC
1795
PUT
DELISTED
PortfolioPlus S&P 500 ETF
PPLC
| $2.82M | ﹤0.01% |
369,300
-36,500
| -9% | -$279K |
|
|
SRG
1796
CALL
Seritage Growth Properties
SRG
$130M
| $2.82M | ﹤0.01% |
364,300
+104,500
| +40% | +$876K |
|
1797
PUT
Entegris
ENTG
$19.7B
| $2.82M | ﹤0.01% |
30,000
+8,300
| +38% | +$831K |
|
1798
PUT
Autohome
ATHM
$2.43B
| $2.82M | ﹤0.01% |
92,800
+73,800
| +388% | +$2.22M |
|
1799
CALL
Cincinnati Financial
CINF
$28.3B
| $2.81M | ﹤0.01% |
27,500
+9,800
| +55% | +$1.02M |
|
1800
GE HealthCare
GEHC
$27.6B
| $2.81M | ﹤0.01% |
+41,337
| New | +$3.01M |
|
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.