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 | |
|---|---|---|---|---|---|---|
1226
PUT
YPF
YPF
$20.2B
| $1.65M | ﹤0.01% |
1,230
+36
| +3% | +$529 |
|
1227
CALL
IPG Photonics
IPGP
$3.89B
| $1.64M | ﹤0.01% |
145
-28
| -16% | -$3.72K |
|
|
KSU
1228
CALL
DELISTED
Kansas City Southern
KSU
| $1.64M | ﹤0.01% |
172
+23
| +15% | +$2.33K |
|
1229
PUT
Bath & Body Works
BBWI
$4.01B
| $1.64M | ﹤0.01% |
790
-518
| -40% | -$13.1K |
|
1230
CALL
Copa Holdings
CPA
$5.56B
| $1.64M | ﹤0.01% |
208
-37
| -15% | -$2.9K |
|
1231
CALL
Cardinal Health
CAH
$53.4B
| $1.64M | ﹤0.01% |
367
-299
| -45% | -$15.6K |
|
|
CDK
1232
DELISTED
CDK Global, Inc.
CDK
| $1.64M | ﹤0.01% |
34,185
+3,257
| +11% | +$172K |
|
1233
CALL
Ciena
CIEN
$55.3B
| $1.63M | ﹤0.01% |
482
-12
| -2% | -$380 |
|
1234
CALL
Williams-Sonoma
WSM
$26.7B
| $1.63M | ﹤0.01% |
646
+266
| +70% | +$7.61K |
|
1235
PUT
BioMarin Pharmaceuticals
BMRN
$11.5B
| $1.63M | ﹤0.01% |
191
-98
| -34% | -$9.32K |
|
|
REN
1236
CALL
DELISTED
Resolute Energy Corporaton
REN
| $1.62M | ﹤0.01% |
560
+467
| +502% | +$14.7K |
|
1237
CALL
SolarEdge
SEDG
$2.59B
| $1.62M | ﹤0.01% |
462
+186
| +67% | +$7.12K |
|
1238
CALL
Huntington Ingalls Industries
HII
$11.3B
| $1.62M | ﹤0.01% |
85
+57
| +204% | +$12.4K |
|
1239
RH
RH
$3.3B
| $1.61M | ﹤0.01% |
13,481
-7,685
| -36% | -$924K |
|
1240
CALL
Whirlpool
WHR
$2.42B
| $1.61M | ﹤0.01% |
151
+4
| +3% | +$454 |
|
1241
PUT
Carvana
CVNA
$43.3B
| $1.61M | ﹤0.01% |
2,460
+1,005
| +69% | +$8.46K |
|
1242
CALL
Entergy
ETR
$54.1B
| $1.61M | ﹤0.01% |
374
+140
| +60% | +$5.96K |
|
1243
CALL
HubSpot
HUBS
$10.5B
| $1.61M | ﹤0.01% |
128
+70
| +121% | +$9.17K |
|
|
PARA
1244
PUT
DELISTED
Paramount Global Class B
PARA
| $1.61M | ﹤0.01% |
368
-359
| -49% | -$19.1K |
|
1245
CALL
MongoDB
MDB
$24B
| $1.61M | ﹤0.01% |
192
-51
| -21% | -$3.92K |
|
|
SIX
1246
CALL
DELISTED
Six Flags Entertainment Corp.
SIX
| $1.61M | ﹤0.01% |
289
+126
| +77% | +$7.53K |
|
1247
CALL
Nutrien
NTR
$32.7B
| $1.61M | ﹤0.01% |
342
-27
| -7% | -$1.41K |
|
1248
PUT
Vipshop
VIPS
$6.84B
| $1.6M | ﹤0.01% |
2,941
-3,156
| -52% | -$17K |
|
1249
MSCI
MSCI
$40B
| $1.6M | ﹤0.01% |
+10,860
| New | +$1.65M |
|
1250
PUT
Trane Technologies
TT
$106B
| $1.6M | ﹤0.01% |
175
+32
| +22% | +$3.15K |
|
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.