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 |
NVIDIA
NVDA
|
+$29.6M |
| 2 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$22.6M |
| 3 |
iShares Russell 2000 ETF
IWM
|
+$17.9M |
| 4 |
Netflix
NFLX
|
+$17.1M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$13.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 2 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$40.6M |
| 3 |
Walt Disney
DIS
|
+$25.6M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$13.5M |
| 5 |
Johnson & Johnson
JNJ
|
+$11.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.5% |
| 2 | Communication Services | 0.5% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.3% |
| 5 | Consumer Discretionary | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1151
CALL
Zebra Technologies
ZBRA
$12.4B
| $2.47M | 0.01% |
118
-36
| -23% | -$7.26K |
|
1152
CALL
Paychex
PAYX
$40.4B
| $2.47M | 0.01% |
300
+50
| +20% | +$4.22K |
|
1153
PUT
Toll Brothers
TOL
$14B
| $2.47M | 0.01% |
674
+85
| +14% | +$3.17K |
|
1154
PUT
SolarEdge
SEDG
$2.59B
| $2.47M | 0.01% |
395
+9
| +2% | +$454 |
|
|
IPFF
1155
CALL
DELISTED
iShares International Preferred Stock ETF
IPFF
| $2.46M | 0.01% |
524
+79
| +18% | +$1.2K |
|
1156
PUT
Automatic Data Processing
ADP
$100B
| $2.46M | 0.01% |
149
-438
| -75% | -$71.2K |
|
1157
CALL
LyondellBasell Industries
LYB
$19.5B
| $2.46M | 0.01% |
286
-368
| -56% | -$31.4K |
|
1158
CALL
Alcoa
AA
$11.7B
| $2.46M | 0.01% |
1,052
-79
| -7% | -$1.97K |
|
1159
PUT
Moody's
MCO
$82.4B
| $2.46M | 0.01% |
126
+23
| +22% | +$4.37K |
|
1160
CALL
CMS Energy
CMS
$23.1B
| $2.46M | 0.01% |
424
-158
| -27% | -$8.87K |
|
|
PRO
1161
PUT
DELISTED
PROS Holdings
PRO
| $2.45M | 0.01% |
388
+142
| +58% | +$7.47K |
|
1162
CALL
NovoCure
NVCR
$2.04B
| $2.45M | 0.01% |
388
+31
| +9% | +$1.57K |
|
1163
WEC Energy
WEC
$37.7B
| $2.45M | 0.01% |
29,379
+27,531
| +1,490% | +$2.21M |
|
1164
CALL
Lumen
LUMN
$6.53B
| $2.44M | 0.01% |
2,074
-1,847
| -47% | -$20.8K |
|
1165
PUT
Popular Inc
BPOP
$11B
| $2.42M | 0.01% |
447
+120
| +37% | +$6.55K |
|
1166
CALL
TripAdvisor
TRIP
$1.59B
| $2.41M | 0.01% |
521
+298
| +134% | +$14.5K |
|
1167
Morgan Stanley
MS
$337B
| $2.41M | 0.01% |
55,029
+9,592
| +21% | +$428K |
|
1168
CALL
Ameriprise Financial
AMP
$46.8B
| $2.41M | 0.01% |
166
+11
| +7% | +$1.59K |
|
1169
PUT
Nektar Therapeutics
NKTR
$2.39B
| $2.41M | 0.01% |
45
+9
| +25% | +$4.51K |
|
|
KL
1170
PUT
DELISTED
Kirkland Lake Gold Ltd Ordinary
KL
| $2.4M | 0.01% |
559
+164
| +42% | +$5.69K |
|
1171
PUT
JB Hunt Transport Services
JBHT
$27.1B
| $2.39M | 0.01% |
262
+251
| +2,282% | +$23.7K |
|
|
LM
1172
PUT
DELISTED
Legg Mason, Inc.
LM
| $2.39M | 0.01% |
625
-403
| -39% | -$13.9K |
|
1173
PUT
Yeti Holdings
YETI
$3.82B
| $2.39M | 0.01% |
825
+707
| +599% | +$20.4K |
|
1174
PUT
Safety Insurance
SAFT
$1.52B
| $2.39M | 0.01% |
251
-176
| -41% | -$16.4K |
|
|
BHVN
1175
DELISTED
Biohaven Pharmaceutical Holding Company Ltd.
BHVN
| $2.38M | 0.01% |
54,434
+17,986
| +49% | +$1.01M |
|
Similar funds
Simplex Trading's Q2 2019 Portfolio in Review
As of Q2 2019, Simplex Trading held 8,406 positions worth $36.6B, up 1.9% from $36B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q2 2019 filing shows 1,261 new, 2,604 increased, 3,015 reduced and 1,301 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 105,724 shares worth $14M. The largest sale was Invesco QQQ Trust, an estimated $123M.
By sector, the portfolio is most concentrated in Technology at 0.5% of assets, up from 0.42% a quarter earlier, followed by Communication Services and Healthcare.
- Simplex Trading's largest Q2 2019 buy was iShares 20+ Year Treasury Bond ETF: 105,724 shares worth $14M.
- Simplex Trading added most to NVIDIA in Q2 2019, an estimated $29.6M increase.
- Simplex Trading's biggest Q2 2019 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $40.6M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2019, selling an estimated $123M.
- Simplex Trading's ten largest holdings make up 35% of its $36.6B portfolio in Q2 2019.
- Simplex Trading opened 1,261 new positions and closed 1,301 in Q2 2019.
- Simplex Trading's portfolio value rose 1.9% quarter-over-quarter to $36.6B.
Based on Simplex Trading's 13F filing for Q2 2019, filed 26 Jul 2019.