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 | |
|---|---|---|---|---|---|---|
1101
CALL
Royal Gold
RGLD
$17.1B
| $7.3M | 0.01% |
68,700
-58,500
| -46% | -$6.65M |
|
1102
CALL
Monolithic Power Systems
MPWR
$66.1B
| $7.3M | 0.01% |
15,800
-16,100
| -50% | -$8.24M |
|
1103
PUT
Regions Financial
RF
$26.2B
| $7.28M | 0.01% |
423,000
-118,700
| -22% | -$2.25M |
|
1104
CALL
Madrigal Pharmaceuticals
MDGL
$12.4B
| $7.27M | 0.01% |
49,800
+11,200
| +29% | +$2.11M |
|
1105
CALL
Carlyle Group
CG
$16.1B
| $7.27M | 0.01% |
241,000
+14,000
| +6% | +$451K |
|
1106
PUT
Lamb Weston
LW
$6.78B
| $7.24M | 0.01% |
78,300
+29,600
| +61% | +$3M |
|
1107
Hershey
HSY
$35.2B
| $7.23M | 0.01% |
36,127
+23,057
| +176% | +$5.16M |
|
1108
Twilio
TWLO
$28.8B
| $7.2M | 0.01% |
123,005
-28,666
| -19% | -$1.79M |
|
1109
PUT
Meritage Homes
MTH
$4.82B
| $7.2M | 0.01% |
117,600
+96,200
| +450% | +$6.61M |
|
1110
PUT
Zoetis
ZTS
$31.6B
| $7.17M | 0.01% |
41,200
-91,100
| -69% | -$16.5M |
|
1111
CALL
JetBlue
JBLU
$1.89B
| $7.14M | 0.01% |
1,553,300
+1,146,100
| +281% | +$7.54M |
|
1112
PUT
Restaurant Brands International
QSR
$25.2B
| $7.14M | 0.01% |
107,200
-4,200
| -4% | -$302K |
|
1113
PUT
Eversource Energy
ES
$28.3B
| $7.13M | 0.01% |
122,700
+121,500
| +10,125% | +$8.1M |
|
|
SCIU
1114
PUT
DELISTED
Global X Scientific Beta US ETF
SCIU
| $7.08M | 0.01% |
282,600
-35,200
| -11% | -$882K |
|
|
TWNK
1115
CALL
DELISTED
Hostess Brands, Inc. Class A Common Stock
TWNK
| $7.08M | 0.01% |
212,500
+204,500
| +2,556% | +$5.48M |
|
1116
PUT
Floor & Decor
FND
$5.73B
| $7.08M | 0.01% |
78,200
+17,800
| +29% | +$1.81M |
|
1117
PUT
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $7.08M | 0.01% |
15,500
+6,500
| +72% | +$3.11M |
|
1118
PUT
General Dynamics
GD
$104B
| $7.07M | 0.01% |
32,000
-15,100
| -32% | -$3.34M |
|
1119
PUT
Southern Copper
SCCO
$141B
| $7.06M | 0.01% |
101,183
+42,177
| +71% | +$3.08M |
|
|
K
1120
CALL
DELISTED
Kellanova
K
| $7.04M | 0.01% |
126,096
-51,333
| -29% | -$3.05M |
|
1121
CALL
MasTec
MTZ
$28.1B
| $7.04M | 0.01% |
97,900
+65,500
| +202% | +$6.53M |
|
1122
CALL
Blackstone Mortgage Trust
BXMT
$2.81B
| $7.04M | 0.01% |
323,700
+170,700
| +112% | +$3.79M |
|
1123
PUT
Republic Services
RSG
$67.1B
| $7.03M | 0.01% |
49,300
+3,200
| +7% | +$475K |
|
1124
PUT
Bank OZK
OZK
$5.48B
| $7.02M | 0.01% |
189,500
-8,400
| -4% | -$340K |
|
1125
State Street SPDR S&P Retail ETF
XRT
$362M
| $6.99M | 0.01% |
+114,839
| New | +$7.36M |
|
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.