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 | |
|---|---|---|---|---|---|---|
1401
ProShares Ultra Russell2000
UWM
$255M
| $162K | 0.01% |
+4,686
| New | +$169K |
|
1402
Vodafone
VOD
$34.9B
| $162K | 0.01% |
+5,849
| New | +$174K |
|
|
VRNT
1403
DELISTED
Verint Systems
VRNT
| $162K | 0.01% |
7,510
+4,897
| +187% | +$101K |
|
|
PGNX
1404
DELISTED
Progenics Pharmaceuticals Inc
PGNX
| $162K | 0.01% |
21,754
+6,044
| +38% | +$40.2K |
|
1405
Apogee Enterprises
APOG
$850M
| $161K | 0.01% |
3,717
-5,713
| -61% | -$255K |
|
1406
CALL
International Paper
IP
$22.3B
| $161K | 0.01% |
1,172
+452
| +63% | +$25.1K |
|
1407
CALL
J.M. Smucker
SJM
$12.6B
| $161K | 0.01% |
179
+98
| +121% | +$12.2K |
|
|
SMC
1408
Summit Midstream
SMC
$421M
| $161K | 0.01% |
766
+688
| +882% | +$196K |
|
|
AMTD
1409
CALL
DELISTED
TD Ameritrade Holding Corp
AMTD
| $161K | 0.01% |
448
+143
| +47% | +$8.11K |
|
1410
Archrock
AROC
$6.33B
| $160K | 0.01% |
+18,304
| New | +$175K |
|
1411
CALL
Delek US
DK
$3.87B
| $160K | 0.01% |
208
-490
| -70% | -$17.6K |
|
|
DQ
1412
PUT
Daqo New Energy
DQ
$790M
| $160K | 0.01% |
1,245
+15
| +1% | +$162 |
|
1413
ProShares UltraShort Energy
DUG
$19.7M
| $160K | 0.01% |
+199
| New | +$152K |
|
1414
CALL
TripAdvisor
TRIP
$1.59B
| $160K | 0.01% |
898
-149
| -14% | -$5.83K |
|
1415
MasterCraft Boat Holdings
MCFT
$588M
| $159K | 0.01% |
+6,335
| New | +$153K |
|
1416
Supernus Pharmaceuticals
SUPN
$2.68B
| $159K | 0.01% |
3,474
-2,777
| -44% | -$116K |
|
1417
BlackRock TCP Capital
TCPC
$265M
| $159K | 0.01% |
11,195
+8,360
| +295% | +$123K |
|
1418
PUT
Energous
WATT
$80.3M
| $159K | 0.01% |
1
-3
| -75% | -$35.5K |
|
|
CTRL
1419
DELISTED
Control4 Corporation
CTRL
| $159K | 0.01% |
7,443
+7,216
| +3,179% | +$193K |
|
|
DO
1420
PUT
DELISTED
Diamond Offshore Drilling
DO
| $159K | 0.01% |
304
-70
| -19% | -$1.16K |
|
1421
CALL
Dollar General
DG
$25.9B
| $158K | 0.01% |
312
-58
| -16% | -$5.57K |
|
1422
CALL
Fossil Group
FOSL
$239M
| $158K | 0.01% |
746
+445
| +148% | +$4.92K |
|
|
HSII
1423
DELISTED
Heidrick & Struggles
HSII
| $158K | 0.01% |
+5,076
| New | +$139K |
|
1424
PUT
Mohawk Industries
MHK
$6.9B
| $158K | 0.01% |
221
+79
| +56% | +$20.4K |
|
1425
Super Micro Computer
SMCI
$19.5B
| $158K | 0.01% |
93,450
+64,420
| +222% | +$129K |
|
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.