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 | |
|---|---|---|---|---|---|---|
1501
PUT
Gen Digital
GEN
$15.6B
| $143K | 0.01% |
746
-661
| -47% | -$18K |
|
1502
Gibraltar Industries
ROCK
$1.34B
| $143K | 0.01% |
4,245
+4,082
| +2,504% | +$142K |
|
|
SGMO
1503
CALL
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $143K | 0.01% |
488
-752
| -61% | -$16.1K |
|
1504
CALL
Synchrony
SYF
$23.7B
| $143K | 0.01% |
697
-2,428
| -78% | -$90.1K |
|
|
SIEN
1505
PUT
DELISTED
Sientra, Inc.
SIEN
| $143K | 0.01% |
32
+12
| +60% | +$1.32K |
|
|
OCLR
1506
CALL
DELISTED
Oclaro Inc.
OCLR
| $143K | 0.01% |
522
-88
| -14% | -$661 |
|
1507
PUT
BP
BP
$113B
| $142K | 0.01% |
1,478
-78
| -5% | -$2.94K |
|
1508
Parker-Hannifin
PH
$125B
| $142K | 0.01% |
+835
| New | +$158K |
|
1509
Upbound Group
UPBD
$1.19B
| $142K | 0.01% |
+16,534
| New | +$159K |
|
1510
Woodward
WWD
$25B
| $142K | 0.01% |
1,989
+1,861
| +1,454% | +$140K |
|
|
ORBK
1511
CALL
DELISTED
Orbotech Ltd
ORBK
| $142K | 0.01% |
151
+70
| +86% | +$3.84K |
|
|
AHL
1512
DELISTED
ASPEN Insurance Holding Limited
AHL
| $142K | 0.01% |
3,185
-7,120
| -69% | -$279K |
|
1513
CALL
Conagra Brands
CAG
$7.07B
| $141K | 0.01% |
667
-577
| -46% | -$21.3K |
|
1514
PUT
Carter's
CRI
$1.43B
| $141K | 0.01% |
331
+310
| +1,476% | +$36K |
|
1515
Eagle Materials
EXP
$6.6B
| $141K | 0.01% |
1,372
-2,440
| -64% | -$263K |
|
1516
Ezcorp Inc
EZPW
$1.82B
| $141K | 0.01% |
+10,701
| New | +$137K |
|
1517
Hilton Grand Vacations
HGV
$3.84B
| $141K | 0.01% |
+3,283
| New | +$144K |
|
1518
MGP Ingredients
MGPI
$378M
| $141K | 0.01% |
+1,578
| New | +$128K |
|
1519
CALL
RingCentral
RNG
$4.05B
| $141K | 0.01% |
183
-15
| -8% | -$879 |
|
1520
PUT
Range Resources
RRC
$9.11B
| $141K | 0.01% |
343
-241
| -41% | -$3.6K |
|
1521
ConocoPhillips
COP
$147B
| $140K | 0.01% |
2,372
-28,853
| -92% | -$1.63M |
|
|
DMC
1522
Del Monte Corp
DMC
$1.35B
| $140K | 0.01% |
3,112
+2,559
| +463% | +$121K |
|
1523
iShares Core S&P Mid-Cap ETF
IJH
$123B
| $140K | 0.01% |
+3,755
| New | +$144K |
|
1524
Sanmina
SANM
$11.2B
| $140K | 0.01% |
+5,382
| New | +$154K |
|
|
TSRO
1525
DELISTED
TESARO, Inc.
TSRO
| $140K | 0.01% |
2,460
-3,005
| -55% | -$193K |
|
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.