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 |
Tesla
TSLA
|
+$33.5M |
| 2 |
Netflix
NFLX
|
+$22.8M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$20.9M |
| 4 |
TWX
Time Warner Inc
TWX
|
+$18.3M |
| 5 |
Alibaba
BABA
|
+$15.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$71.1M |
| 2 |
Micron Technology
MU
|
+$43.8M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$26.3M |
| 4 |
Booking.com
BKNG
|
+$22.2M |
| 5 |
Boeing
BA
|
+$21.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 7.87% |
| 2 | Communication Services | 7.14% |
| 3 | Technology | 6.23% |
| 4 | Financials | 5.5% |
| 5 | Healthcare | 5.2% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
IBKC
1701
DELISTED
IBERIABANK Corp
IBKC
| $115K | 0.01% |
1,487
-2,394
| -62% | -$196K |
|
|
COL
1702
DELISTED
Rockwell Collins
COL
| $115K | 0.01% |
853
-7,491
| -90% | -$1.02M |
|
|
ZGNX
1703
CALL
DELISTED
Zogenix, Inc.
ZGNX
| $115K | 0.01% |
224
-238
| -52% | -$9.44K |
|
1704
CALL
Enphase Energy
ENPH
$4.84B
| $114K | 0.01% |
+816
| New | +$2.48K |
|
|
HES
1705
PUT
DELISTED
Hess
HES
| $114K | 0.01% |
1,570
-470
| -23% | -$23K |
|
1706
CALL
Lumen
LUMN
$6.53B
| $114K | 0.01% |
1,475
-3,314
| -69% | -$57.5K |
|
1707
CALL
M&T Bank
MTB
$36.2B
| $114K | 0.01% |
150
+99
| +194% | +$18.5K |
|
1708
PUT
Atlassian
TEAM
$22B
| $114K | 0.01% |
269
+197
| +274% | +$10.7K |
|
|
HABT
1709
DELISTED
The Habit Restaurants, Inc. - Class A
HABT
| $114K | 0.01% |
12,974
+12,073
| +1,340% | +$109K |
|
|
PRMW
1710
PUT
DELISTED
Primo Water Corporation
PRMW
| $114K | 0.01% |
1,306
-168
| -11% | -$2.09K |
|
1711
PUT
Citizens Financial Group
CFG
$30.4B
| $113K | 0.01% |
252
-53
| -17% | -$2.38K |
|
1712
Core Laboratories
CLB
$538M
| $113K | 0.01% |
+1,053
| New | +$117K |
|
1713
PUT
NETSCOUT
NTCT
$2.86B
| $113K | 0.01% |
528
+470
| +810% | +$12.8K |
|
1714
CALL
OneMain Financial
OMF
$6.9B
| $113K | 0.01% |
3,695
+3,671
| +15,296% | +$117K |
|
|
P
1715
PUT
Everpure Inc
P
$24.8B
| $113K | 0.01% |
2,136
-208
| -9% | -$4.08K |
|
|
CRCM
1716
DELISTED
CARE.COM, INC.
CRCM
| $113K | 0.01% |
6,969
+5,886
| +543% | +$108K |
|
1717
CALL
Advanced Energy
AEIS
$12.2B
| $112K | ﹤0.01% |
1,701
+1,569
| +1,189% | +$108K |
|
|
HPP
1718
Hudson Pacific Properties
HPP
$834M
| $112K | ﹤0.01% |
+495
| New | +$110K |
|
|
IRBT
1719
CALL
DELISTED
iRobot
IRBT
| $112K | ﹤0.01% |
1,522
+1,262
| +485% | +$95K |
|
1720
Sensata Technologies
ST
$6.65B
| $112K | ﹤0.01% |
2,172
-1,466
| -40% | -$78.1K |
|
|
TRVG
1721
trivago
TRVG
$386M
| $112K | ﹤0.01% |
3,244
-9,632
| -75% | -$379K |
|
1722
CALL
Urban Outfitters
URBN
$5.99B
| $112K | ﹤0.01% |
473
+252
| +114% | +$8.84K |
|
1723
Advanced Drainage Systems
WMS
$10.9B
| $112K | ﹤0.01% |
4,360
-9,568
| -69% | -$242K |
|
1724
PUT
Zimmer Biomet
ZBH
$17.7B
| $112K | ﹤0.01% |
63
+16
| +34% | +$1.86K |
|
|
LUMO
1725
CALL
DELISTED
Lumos Pharma, Inc. Common Stock
LUMO
| $112K | ﹤0.01% |
98
+73
| +292% | +$5.17K |
|
Similar funds
Simplex Trading's Q1 2018 Portfolio in Review
As of Q1 2018, Simplex Trading held 7,591 positions worth $2.27B, down 2.1% from $2.32B the previous quarter. Its ten largest holdings account for 18% of the portfolio.
Simplex Trading withdrew a net $210M in Q1 2018, closing 1,502 positions and reducing 2,267 holdings. Its most notable exit was Alphabet (Google) Class C, an estimated $26.3M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 7.9% of assets, down from 11% a quarter earlier, followed by Communication Services and Technology.
Against the trend, Simplex Trading opened a new position in Tesla worth $27.1M.
- Simplex Trading's largest Q1 2018 buy was Tesla: 1,525,035 shares worth $27.1M.
- Simplex Trading added most to Netflix in Q1 2018, an estimated $22.8M increase.
- Simplex Trading's biggest Q1 2018 reduction was Amazon, cutting an estimated $71.1M.
- Simplex Trading fully exited Alphabet (Google) Class C in Q1 2018, selling an estimated $26.3M.
- Simplex Trading's ten largest holdings make up 18% of its $2.27B portfolio in Q1 2018.
- Simplex Trading opened 1,643 new positions and closed 1,502 in Q1 2018.
- Simplex Trading's portfolio value fell 2.1% quarter-over-quarter to $2.27B.
Based on Simplex Trading's 13F filing for Q1 2018, filed 26 Apr 2018.