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 | |
|---|---|---|---|---|---|---|
3851
CALL
Highwoods Properties
HIW
$3.71B
| $325K | ﹤0.01% |
15,800
+9,000
| +132% | +$214K |
|
3852
Frontier Group Holdings
ULCC
$1.43B
| $324K | ﹤0.01% |
67,113
+52,980
| +375% | +$397K |
|
|
ERF
3853
CALL
DELISTED
Enerplus Corporation
ERF
| $324K | ﹤0.01% |
18,400
-800
| -4% | -$13.2K |
|
3854
PUT
Archer Aviation
ACHR
$3.68B
| $323K | ﹤0.01% |
63,900
-48,300
| -43% | -$277K |
|
3855
CALL
AMN Healthcare
AMN
$1.35B
| $323K | ﹤0.01% |
3,800
-25,900
| -87% | -$2.46M |
|
3856
CNX Resources
CNX
$4.84B
| $323K | ﹤0.01% |
+14,341
| New | +$297K |
|
3857
CALL
Stratasys
SSYS
$690M
| $323K | ﹤0.01% |
23,800
-7,900
| -25% | -$125K |
|
3858
Corteva
CTVA
$59.5B
| $322K | ﹤0.01% |
6,301
+1,718
| +37% | +$91K |
|
3859
Dyne Therapeutics
DYN
$4.28B
| $322K | ﹤0.01% |
+36,032
| New | +$388K |
|
3860
CALL
Encompass Health
EHC
$11.5B
| $322K | ﹤0.01% |
4,800
-11,400
| -70% | -$784K |
|
3861
PUT
Iridium Communications
IRDM
$4.81B
| $322K | ﹤0.01% |
7,100
-33,200
| -82% | -$1.72M |
|
3862
CALL
LivaNova
LIVN
$4.51B
| $322K | ﹤0.01% |
6,100
-900
| -13% | -$49.3K |
|
|
GOL
3863
CALL
DELISTED
Gol Linhas Aéreas Inteligentes S.A. American Depositary Shares (Each representing Ten Preferred Shares)
GOL
| $322K | ﹤0.01% |
117,700
+1,000
| +0.9% | +$3.53K |
|
|
AGNT
3864
CALL
AGNT Inc
AGNT
$661M
| $321K | ﹤0.01% |
19,800
-35,900
| -64% | -$741K |
|
|
MDC
3865
CALL
DELISTED
M.D.C. Holdings, Inc.
MDC
| $321K | ﹤0.01% |
7,800
-8,800
| -53% | -$410K |
|
3866
CALL
Carbon Collective Climate Solutions US Equity ETF
CCSO
$45.9M
| $320K | ﹤0.01% |
19,800
+19,300
| +3,860% | +$382K |
|
3867
CALL
Church & Dwight Co
CHD
$23.7B
| $320K | ﹤0.01% |
3,500
-1,800
| -34% | -$172K |
|
3868
PUT
iRhythm Holdings
IRTC
$3.86B
| $320K | ﹤0.01% |
3,400
-37,200
| -92% | -$3.78M |
|
3869
PUT
ANI Pharmaceuticals
ANIP
$1.84B
| $319K | ﹤0.01% |
5,500
+2,600
| +90% | +$150K |
|
3870
PUT
Garrett Motion
GTX
$5.6B
| $319K | ﹤0.01% |
40,600
+23,900
| +143% | +$184K |
|
3871
Manhattan Associates
MANH
$9.95B
| $319K | ﹤0.01% |
1,616
+100
| +7% | +$19.5K |
|
3872
CALL
Palomar
PLMR
$3.79B
| $319K | ﹤0.01% |
6,300
+6,200
| +6,200% | +$339K |
|
3873
CALL
Upwork
UPWK
$1.21B
| $319K | ﹤0.01% |
28,100
+15,100
| +116% | +$187K |
|
3874
PUT
Ascendis Pharma A/S
ASND
$16.7B
| $318K | ﹤0.01% |
3,400
-7,200
| -68% | -$674K |
|
3875
PUT
CNA Financial
CNA
$15B
| $318K | ﹤0.01% |
+8,100
| New | +$320K |
|
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.