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 |
iShares Russell 2000 ETF
IWM
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1251
CALL
Zscaler
ZS
$23B
| $1.59M | ﹤0.01% |
407
-76
| -16% | -$2.87K |
|
1252
PUT
JetBlue
JBLU
$1.96B
| $1.59M | ﹤0.01% |
992
+755
| +319% | +$13.2K |
|
|
NATI
1253
PUT
DELISTED
National Instruments Corp
NATI
| $1.59M | ﹤0.01% |
351
+350
| +35,000% | +$16.3K |
|
|
SAGE
1254
CALL
DELISTED
Sage Therapeutics
SAGE
| $1.59M | ﹤0.01% |
166
+73
| +78% | +$8.35K |
|
1255
Molson Coors Class B
TAP
$7.68B
| $1.59M | ﹤0.01% |
28,326
+14,928
| +111% | +$919K |
|
1256
PUT
TE Connectivity
TEL
$58.8B
| $1.59M | ﹤0.01% |
210
+3
| +1% | +$231 |
|
1257
PUT
Gen Digital
GEN
$15.6B
| $1.59M | ﹤0.01% |
840
-1,099
| -57% | -$22.7K |
|
1258
CALL
First Financial Bankshares
FFIN
$4.97B
| $1.59M | ﹤0.01% |
+550
| New | +$16.5K |
|
1259
PUT
NRG Energy
NRG
$29.8B
| $1.58M | ﹤0.01% |
400
+366
| +1,076% | +$14K |
|
1260
Union Pacific
UNP
$182B
| $1.58M | ﹤0.01% |
11,455
-77,632
| -87% | -$11.5M |
|
|
DFS
1261
CALL
DELISTED
Discover Financial Services
DFS
| $1.58M | ﹤0.01% |
268
+87
| +48% | +$6.01K |
|
1262
Waste Management
WM
$95.9B
| $1.58M | ﹤0.01% |
17,729
-14,346
| -45% | -$1.29M |
|
1263
CALL
Digital Realty Trust
DLR
$73.7B
| $1.58M | ﹤0.01% |
148
+86
| +139% | +$9.5K |
|
|
TVPT
1264
CALL
DELISTED
Travelport Worldwide Limited
TVPT
| $1.57M | ﹤0.01% |
1,006
+991
| +6,607% | +$15.1K |
|
1265
PUT
Reinsurance Group of America
RGA
$15.7B
| $1.57M | ﹤0.01% |
112
-64
| -36% | -$9.07K |
|
1266
Align Technology
ALGN
$12B
| $1.57M | ﹤0.01% |
7,496
-8,137
| -52% | -$2.06M |
|
|
MNDT
1267
DELISTED
Mandiant, Inc. Common Stock
MNDT
| $1.57M | ﹤0.01% |
96,728
+42,529
| +78% | +$764K |
|
1268
PUT
Abercrombie & Fitch
ANF
$4.17B
| $1.56M | ﹤0.01% |
781
+37
| +5% | +$693 |
|
1269
CALL
Eastman Chemical
EMN
$7.8B
| $1.56M | ﹤0.01% |
214
+46
| +27% | +$3.67K |
|
1270
PUT
Royal Gold
RGLD
$17.1B
| $1.56M | ﹤0.01% |
182
+44
| +32% | +$3.39K |
|
1271
State Street SPDR S&P Retail ETF
XRT
$365M
| $1.56M | ﹤0.01% |
37,981
-69,746
| -65% | -$3.19M |
|
|
KYNB
1272
PUT
Kyntra Bio
KYNB
$28.5M
| $1.55M | ﹤0.01% |
13
-18
| -58% | -$20.2K |
|
|
MLNX
1273
CALL
DELISTED
Mellanox Technologies, Ltd.
MLNX
| $1.55M | ﹤0.01% |
168
+159
| +1,767% | +$13.5K |
|
1274
Transocean
RIG
$5.92B
| $1.55M | ﹤0.01% |
223,335
+222,479
| +25,991% | +$2.27M |
|
1275
CALL
Dentsply Sirona
XRAY
$2.59B
| $1.54M | ﹤0.01% |
415
+112
| +37% | +$4.08K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.