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 | |
|---|---|---|---|---|---|---|
1201
CALL
Agilent Technologies
A
$39.1B
| $6.17M | ﹤0.01% |
55,200
+41,900
| +315% | +$5.02M |
|
1202
PUT
Deutsche Bank
DB
$66.9B
| $6.17M | ﹤0.01% |
561,200
-71,200
| -11% | -$770K |
|
|
HZNP
1203
DELISTED
Horizon Therapeutics Public Limited Company Ordinary Shares
HZNP
| $6.17M | ﹤0.01% |
53,301
-21,662
| -29% | -$2.33M |
|
1204
PUT
FirstEnergy
FE
$28.8B
| $6.14M | ﹤0.01% |
179,700
+122,600
| +215% | +$4.56M |
|
|
MPT
1205
PUT
Medical Properties Trust
MPT
$2.91B
| $6.13M | ﹤0.01% |
1,124,800
-1,833,500
| -62% | -$14.7M |
|
1206
CALL
MarketAxess Holdings
MKTX
$4.08B
| $6.11M | ﹤0.01% |
28,600
+25,400
| +794% | +$6.16M |
|
1207
CALL
Fastly Inc
FSLY
$3.14B
| $6.1M | ﹤0.01% |
318,400
+25,200
| +9% | +$492K |
|
1208
CALL
Western Alliance Bancorporation
WAL
$9.1B
| $6.09M | ﹤0.01% |
132,600
-103,000
| -44% | -$4.86M |
|
1209
Walmart Inc
WMT
$869B
| $6.08M | ﹤0.01% |
+113,997
| New | +$6.07M |
|
1210
PUT
Alliant Energy
LNT
$19.4B
| $6.08M | ﹤0.01% |
125,400
-30,200
| -19% | -$1.57M |
|
1211
CALL
Vulcan Materials
VMC
$36.3B
| $6.06M | ﹤0.01% |
30,000
+6,500
| +28% | +$1.41M |
|
|
MPT
1212
CALL
Medical Properties Trust
MPT
$2.91B
| $6.05M | ﹤0.01% |
1,110,900
+561,500
| +102% | +$4.5M |
|
1213
PUT
Cardinal Health
CAH
$53.4B
| $6.05M | ﹤0.01% |
69,700
+1,100
| +2% | +$99.4K |
|
1214
PUT
DTE Energy
DTE
$31.2B
| $6.05M | ﹤0.01% |
60,900
+58,900
| +2,945% | +$6.34M |
|
1215
CALL
New Oriental
EDU
$7.86B
| $6.03M | ﹤0.01% |
103,000
-6,200
| -6% | -$325K |
|
1216
PUT
Air Products & Chemicals
APD
$66.1B
| $6.01M | ﹤0.01% |
21,200
+9,700
| +84% | +$2.85M |
|
1217
CALL
O'Reilly Automotive
ORLY
$72.1B
| $6M | ﹤0.01% |
99,000
| – | – |
|
1218
CALL
argenx
ARGX
$57.5B
| $6M | ﹤0.01% |
12,200
-20,000
| -62% | -$9.78M |
|
|
CNR
1219
CALL
Core Natural Resources Inc
CNR
$4.27B
| $5.99M | ﹤0.01% |
57,100
+11,500
| +25% | +$939K |
|
1220
CALL
Colgate-Palmolive
CL
$72.8B
| $5.99M | ﹤0.01% |
84,200
-136,000
| -62% | -$10.2M |
|
1221
CALL
KB Home
KBH
$3.51B
| $5.98M | ﹤0.01% |
129,200
-6,200
| -5% | -$315K |
|
1222
CALL
Southern Copper
SCCO
$143B
| $5.97M | ﹤0.01% |
85,542
-7,119
| -8% | -$520K |
|
|
1223
PUT
Vulcan Materials
VMC
$36.3B
| $5.96M | ﹤0.01% |
29,500
+2,500
| +9% | +$544K |
|
1224
CALL
PAR Technology
PAR
$650M
| $5.96M | ﹤0.01% |
154,600
+7,800
| +5% | +$295K |
|
1225
PUT
CRISPR Therapeutics
CRSP
$4.63B
| $5.95M | ﹤0.01% |
131,000
+43,600
| +50% | +$2.25M |
|
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.