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 | |
|---|---|---|---|---|---|---|
976
Zoom
ZM
$24.7B
| $8.96M | 0.01% |
128,173
+11,956
| +10% | +$830K |
|
977
PUT
Match Group
MTCH
$8.72B
| $8.96M | 0.01% |
228,600
+90,500
| +66% | +$4.01M |
|
978
CALL
Waste Management
WM
$95.3B
| $8.95M | 0.01% |
58,700
-6,700
| -10% | -$1.08M |
|
|
UCD
979
CALL
DELISTED
PROSHARES ULTRA BLOOMBERG COMMODITY
UCD
| $8.94M | 0.01% |
197,400
+34,900
| +21% | +$1.58M |
|
980
PUT
Logitech
LOGI
$14.8B
| $8.94M | 0.01% |
129,700
+9,200
| +8% | +$620K |
|
981
PUT
Canadian Natural Resources
CNQ
$98B
| $8.92M | 0.01% |
276,000
-34,200
| -11% | -$1.05M |
|
982
CALL
Ross Stores
ROST
$74.5B
| $8.92M | 0.01% |
79,000
-34,900
| -31% | -$4M |
|
983
CALL
VF Corp
VFC
$6.49B
| $8.92M | 0.01% |
504,800
-164,800
| -25% | -$3.14M |
|
984
CALL
ResMed
RMD
$27.8B
| $8.92M | 0.01% |
60,300
+56,600
| +1,530% | +$10.2M |
|
985
PUT
Beyond Meat
BYND
$289M
| $8.88M | 0.01% |
922,700
-27,300
| -3% | -$356K |
|
986
Goldman Sachs
GS
$317B
| $8.86M | 0.01% |
27,371
-21,220
| -44% | -$7.09M |
|
987
PUT
Lucid Motors
LCID
$2.52B
| $8.85M | 0.01% |
158,360
-139,350
| -47% | -$9.02M |
|
988
PUT
Stryker
SYK
$122B
| $8.83M | 0.01% |
32,300
-13,400
| -29% | -$3.84M |
|
989
CALL
Ferrari
RACE
$63.2B
| $8.81M | 0.01% |
29,800
-31,800
| -52% | -$9.87M |
|
990
PUT
Rockwell Automation
ROK
$51.3B
| $8.8M | 0.01% |
30,800
+22,800
| +285% | +$7.05M |
|
991
CALL
Centene
CNC
$31.5B
| $8.76M | 0.01% |
127,200
+62,000
| +95% | +$4.12M |
|
992
PUT
Wingstop
WING
$3.67B
| $8.76M | 0.01% |
48,700
-16,300
| -25% | -$2.82M |
|
993
PUT
Lyft
LYFT
$5.32B
| $8.72M | 0.01% |
827,300
+457,500
| +124% | +$5.1M |
|
994
CALL
AB InBev
BUD
$155B
| $8.7M | 0.01% |
157,400
-33,600
| -18% | -$1.9M |
|
|
DOCU
995
DocuSign
DOCU
$8.98B
| $8.64M | 0.01% |
205,682
+129,295
| +169% | +$6.34M |
|
996
CALL
Novavax
NVAX
$1.29B
| $8.64M | 0.01% |
1,193,200
+729,100
| +157% | +$5.83M |
|
997
CALL
International Paper
IP
$20.1B
| $8.63M | 0.01% |
243,300
-46,400
| -16% | -$1.58M |
|
998
PUT
Illumina
ILMN
$29.8B
| $8.62M | 0.01% |
64,558
-2,879
| -4% | -$473K |
|
999
PUT
iShares Convertible Bond ETF
ICVT
$7.37B
| $8.62M | 0.01% |
282,700
+94,800
| +50% | +$7.21M |
|
1000
CALL
Mobileye
MBLY
$6.29B
| $8.61M | 0.01% |
207,200
+3,800
| +2% | +$146K |
|
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.