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 | |
|---|---|---|---|---|---|---|
1051
PUT
Inspire Medical Systems
INSP
$1.46B
| $7.82M | 0.01% |
39,400
+28,100
| +249% | +$7.09M |
|
1052
PBF Energy
PBF
$7.33B
| $7.78M | 0.01% |
145,285
+39,226
| +37% | +$1.87M |
|
1053
PUT
QuantumScape Corp
QS
$3.15B
| $7.77M | 0.01% |
1,161,400
+82,300
| +8% | +$670K |
|
1054
PUT
Paycom
PAYC
$6.47B
| $7.75M | 0.01% |
29,900
+11,100
| +59% | +$3.38M |
|
1055
CALL
T. Rowe Price
TROW
$24.6B
| $7.74M | 0.01% |
73,800
+47,700
| +183% | +$5.37M |
|
|
CNR
1056
PUT
Core Natural Resources Inc
CNR
$4.36B
| $7.73M | 0.01% |
73,700
+16,300
| +28% | +$1.33M |
|
1057
PUT
Arbor Realty Trust
ABR
$966M
| $7.73M | 0.01% |
509,200
+38,700
| +8% | +$612K |
|
1058
PUT
Coherent
COHR
$61.3B
| $7.72M | 0.01% |
236,700
-57,600
| -20% | -$2.36M |
|
1059
PUT
Sunrun
RUN
$2.48B
| $7.71M | 0.01% |
614,200
+140,900
| +30% | +$2.32M |
|
1060
CALL
Vanguard FTSE Europe ETF
VGK
$29.8B
| $7.7M | 0.01% |
125,400
-45,700
| -27% | -$2.78M |
|
1061
CALL
IonQ
IONQ
$12.7B
| $7.7M | 0.01% |
517,400
+182,000
| +54% | +$2.86M |
|
1062
CALL
Everest Group
EG
$14.9B
| $7.69M | 0.01% |
20,700
+16,200
| +360% | +$5.88M |
|
1063
Albemarle
ALB
$13.8B
| $7.69M | 0.01% |
45,240
+13,697
| +43% | +$2.73M |
|
1064
CALL
Annaly Capital Management
NLY
$16.7B
| $7.66M | 0.01% |
407,300
+19,000
| +5% | +$378K |
|
1065
CALL
Stellantis
STLA
$16.7B
| $7.65M | 0.01% |
400,100
-37,100
| -8% | -$694K |
|
1066
CALL
BioNTech
BNTX
$23.3B
| $7.65M | 0.01% |
70,400
-110,800
| -61% | -$12.3M |
|
1067
CALL
KKR & Co
KKR
$86.2B
| $7.64M | 0.01% |
124,100
-5,300
| -4% | -$322K |
|
1068
Citigroup
C
$221B
| $7.64M | 0.01% |
185,715
-141,411
| -43% | -$6.21M |
|
1069
CALL
Samsara
IOT
$18.3B
| $7.6M | 0.01% |
301,500
+187,900
| +165% | +$4.98M |
|
1070
CALL
Fastenal
FAST
$53B
| $7.59M | 0.01% |
278,000
-8,000
| -3% | -$227K |
|
1071
PUT
Hawaiian Electric Industries
HE
$2.34B
| $7.58M | 0.01% |
+616,100
| New | +$15M |
|
1072
PUT
United States Natural Gas Fund
UNG
$473M
| $7.58M | 0.01% |
277,600
+1,050
| +0.4% | +$29.4K |
|
|
PARA
1073
DELISTED
Paramount Global Class B
PARA
| $7.56M | 0.01% |
586,169
+527,533
| +900% | +$7.81M |
|
1074
CALL
Avis
CAR
$5.62B
| $7.55M | 0.01% |
42,000
+22,300
| +113% | +$4.83M |
|
1075
PUT
Emerson Electric
EMR
$81.2B
| $7.54M | 0.01% |
78,100
-131,200
| -63% | -$12.5M |
|
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.