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 | |
|---|---|---|---|---|---|---|
1176
PUT
T. Rowe Price
TROW
$25B
| $1.76M | 0.01% |
191
-36
| -16% | -$3.5K |
|
1177
PUT
AerCap
AER
$23.9B
| $1.76M | 0.01% |
445
+379
| +574% | +$19K |
|
|
CTXS
1178
CALL
DELISTED
Citrix Systems Inc
CTXS
| $1.76M | 0.01% |
172
-193
| -53% | -$20.4K |
|
1179
PUT
Cencora
COR
$60.3B
| $1.75M | 0.01% |
236
+50
| +27% | +$4.31K |
|
1180
PUT
Tandem Diabetes Care
TNDM
$1.17B
| $1.75M | 0.01% |
462
-214
| -32% | -$7.56K |
|
1181
Liberty Global Class C
LBTYK
$3.25B
| $1.75M | 0.01% |
84,938
+84,170
| +10,960% | +$2.01M |
|
1182
CALL
WIX.com
WIX
$2.15B
| $1.75M | 0.01% |
194
+20
| +11% | +$1.89K |
|
1183
PUT
Enterprise Products Partners
EPD
$83.8B
| $1.75M | 0.01% |
711
-382
| -35% | -$10.2K |
|
1184
Aon
AON
$77.3B
| $1.75M | 0.01% |
12,007
+5,135
| +75% | +$797K |
|
|
STMP
1185
PUT
DELISTED
Stamps.com, Inc.
STMP
| $1.74M | 0.01% |
112
-120
| -52% | -$21.4K |
|
1186
WisdomTree Japan Hedged Equity Fund
DXJ
$7.23B
| $1.74M | 0.01% |
37,555
+8,342
| +29% | +$435K |
|
1187
VanEck Junior Gold Miners ETF
GDXJ
$7.06B
| $1.74M | 0.01% |
57,535
+9,425
| +20% | +$265K |
|
|
CS
1188
DELISTED
Credit Suisse Group
CS
| $1.74M | 0.01% |
160,064
+78,667
| +97% | +$973K |
|
1189
CALL
Silicon Laboratories
SLAB
$7.15B
| $1.73M | 0.01% |
220
+216
| +5,400% | +$18K |
|
|
UCTT
1190
PUT
Ultra Clean Holdings
UCTT
$4.16B
| $1.73M | 0.01% |
2,045
+1,923
| +1,576% | +$18.8K |
|
1191
CALL
Alcoa
AA
$11.7B
| $1.73M | 0.01% |
649
+229
| +55% | +$7.7K |
|
1192
CALL
Sinclair Inc
SBGI
$974M
| $1.73M | 0.01% |
655
-548
| -46% | -$16K |
|
1193
AGNC Investment
AGNC
$12.3B
| $1.72M | 0.01% |
98,143
+74,602
| +317% | +$1.33M |
|
1194
CALL
Viasat
VSAT
$9.79B
| $1.72M | 0.01% |
292
+168
| +135% | +$10.9K |
|
|
DISH
1195
CALL
DELISTED
DISH Network Corp.
DISH
| $1.72M | 0.01% |
688
+135
| +24% | +$4.24K |
|
1196
CALL
Guidewire Software
GWRE
$11.5B
| $1.72M | 0.01% |
214
+54
| +34% | +$4.71K |
|
1197
PUT
Philips
PHG
$25.4B
| $1.72M | 0.01% |
630
+407
| +183% | +$12K |
|
1198
Western Digital
WDC
$179B
| $1.71M | 0.01% |
61,326
-5,774
| -9% | -$205K |
|
|
ROCC
1199
PUT
DELISTED
Ranger Oil Corporation Class A Common Stock
ROCC
| $1.71M | 0.01% |
317
+35
| +12% | +$2.28K |
|
1200
Spotify
SPOT
$99.2B
| $1.71M | 0.01% |
15,073
-9,075
| -38% | -$1.27M |
|
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.