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 | |
|---|---|---|---|---|---|---|
1401
CALL
Boston Beer
SAM
$1.88B
| $4.67M | ﹤0.01% |
12,000
+3,000
| +33% | +$1.05M |
|
1402
PUT
Ambarella
AMBA
$2.99B
| $4.67M | ﹤0.01% |
88,000
+26,200
| +42% | +$1.84M |
|
1403
CALL
KBR
KBR
$4.68B
| $4.66M | ﹤0.01% |
79,100
+77,700
| +5,550% | +$4.79M |
|
1404
Macy's
M
$6.15B
| $4.66M | ﹤0.01% |
+401,462
| New | +$5.62M |
|
1405
CALL
Molina Healthcare
MOH
$10.3B
| $4.66M | ﹤0.01% |
14,200
-29,000
| -67% | -$9.13M |
|
1406
CALL
Tronox
TROX
$995M
| $4.66M | ﹤0.01% |
346,400
+118,300
| +52% | +$1.58M |
|
|
HCP
1407
CALL
DELISTED
HashiCorp, Inc. Class A Common Stock
HCP
| $4.65M | ﹤0.01% |
203,600
+9,100
| +5% | +$247K |
|
1408
CALL
LPL Financial
LPLA
$26.3B
| $4.63M | ﹤0.01% |
19,500
+13,200
| +210% | +$3.07M |
|
1409
CALL
Magna International
MGA
$17.9B
| $4.63M | ﹤0.01% |
86,400
+75,500
| +693% | +$4.4M |
|
1410
Antero Resources
AR
$10.9B
| $4.61M | ﹤0.01% |
181,836
+123,530
| +212% | +$3.19M |
|
1411
CALL
Bausch Health
BHC
$1.65B
| $4.61M | ﹤0.01% |
561,100
+189,900
| +51% | +$1.64M |
|
1412
PUT
Omnicom Group
OMC
$22.7B
| $4.61M | ﹤0.01% |
61,900
+39,400
| +175% | +$3.25M |
|
1413
PUT
Canadian Pacific Kansas City
CP
$82B
| $4.59M | ﹤0.01% |
61,700
+8,000
| +15% | +$635K |
|
1414
CALL
Vermilion Energy
VET
$1.73B
| $4.59M | ﹤0.01% |
313,700
+131,200
| +72% | +$1.85M |
|
1415
PUT
American Electric Power
AEP
$73.7B
| $4.57M | ﹤0.01% |
60,800
-38,400
| -39% | -$3.12M |
|
1416
CALL
Yum! Brands
YUM
$41B
| $4.57M | ﹤0.01% |
36,600
+5,100
| +16% | +$671K |
|
1417
CALL
Innovative Industrial Properties
IIPR
$1.78B
| $4.57M | ﹤0.01% |
60,400
+53,900
| +829% | +$4.31M |
|
1418
PUT
FIVE9
FIVN
$1.77B
| $4.56M | ﹤0.01% |
70,900
+32,000
| +82% | +$2.39M |
|
1419
CALL
RingCentral
RNG
$4.05B
| $4.56M | ﹤0.01% |
153,800
+34,200
| +29% | +$1.14M |
|
1420
PUT
Steel Dynamics
STLD
$35.6B
| $4.55M | ﹤0.01% |
42,400
-44,000
| -51% | -$4.58M |
|
|
SEE
1421
CALL
DELISTED
Sealed Air
SEE
| $4.54M | ﹤0.01% |
138,300
+82,400
| +147% | +$3.19M |
|
1422
CALL
NOV
NOV
$7.45B
| $4.54M | ﹤0.01% |
217,400
+158,100
| +267% | +$3.14M |
|
1423
CALL
Universal Display
OLED
$3.71B
| $4.54M | ﹤0.01% |
28,900
-23,400
| -45% | -$3.55M |
|
1424
PUT
Xtrackers MSCI Emerging Markets Hedged Equity ETF
DBEM
$105M
| $4.54M | ﹤0.01% |
174,500
+93,800
| +116% | +$2.12M |
|
1425
PUT
DigitalOcean
DOCN
$14.4B
| $4.54M | ﹤0.01% |
188,800
+160,200
| +560% | +$5.67M |
|
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.