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 | |
|---|---|---|---|---|---|---|
3451
PUT
Builders FirstSource
BLDR
$7.53B
| $18K | ﹤0.01% |
+62
| New | +$1.31K |
|
3452
PUT
Blackbaud
BLKB
$1.98B
| $18K | ﹤0.01% |
98
+79
| +416% | +$7.88K |
|
3453
CALL
Cadiz
CDZI
$245M
| $18K | ﹤0.01% |
511
-43
| -8% | -$605 |
|
|
CRON
3454
Cronos Group
CRON
$1.07B
| $18K | ﹤0.01% |
+2,766
| New | +$23.3K |
|
3455
Clearway Energy Class C
CWEN
$4.81B
| $18K | ﹤0.01% |
+1,088
| New | +$19.1K |
|
3456
CALL
Dominion Energy
D
$61.9B
| $18K | ﹤0.01% |
219
-42
| -16% | -$3.1K |
|
3457
PUT
DNOW Inc
DNOW
$2.44B
| $18K | ﹤0.01% |
+274
| New | +$2.99K |
|
3458
iShares MSCI Chile ETF
ECH
$1.01B
| $18K | ﹤0.01% |
+355
| New | +$19.2K |
|
3459
Enerpac Tool Group
EPAC
$1.85B
| $18K | ﹤0.01% |
786
+126
| +19% | +$3.04K |
|
3460
Energy Recovery
ERII
$415M
| $18K | ﹤0.01% |
2,241
-4,178
| -65% | -$33.8K |
|
3461
PUT
Essex Property Trust
ESS
$19B
| $18K | ﹤0.01% |
281
+56
| +25% | +$12.9K |
|
3462
PUT
Exelon
EXC
$47.9B
| $18K | ﹤0.01% |
383
-235
| -38% | -$6.35K |
|
3463
PUT
Fossil Group
FOSL
$257M
| $18K | ﹤0.01% |
412
+200
| +94% | +$2.21K |
|
3464
CALL
Invesco CurrencyShares British Pound Sterling Trust
FXB
$77.1M
| $18K | ﹤0.01% |
63
-97
| -61% | -$13.1K |
|
3465
PUT
Galicia Financial Group
GGAL
$7.99B
| $18K | ﹤0.01% |
327
-9
| -3% | -$591 |
|
3466
Integra LifeSciences
IART
$1.33B
| $18K | ﹤0.01% |
342
+7
| +2% | +$367 |
|
3467
CALL
KKR & Co
KKR
$90.3B
| $18K | ﹤0.01% |
612
+231
| +61% | +$5.13K |
|
|
MAG
3468
PUT
DELISTED
MAG Silver
MAG
| $18K | ﹤0.01% |
92
-12
| -12% | -$131 |
|
3469
PUT
Mercury Systems
MRCY
$5.6B
| $18K | ﹤0.01% |
262
+242
| +1,210% | +$11.5K |
|
3470
NiSource
NI
$21.6B
| $18K | ﹤0.01% |
763
-1,381
| -64% | -$32.7K |
|
3471
PUT
OraSure Technologies
OSUR
$274M
| $18K | ﹤0.01% |
107
+8
| +8% | +$152 |
|
3472
PUT
Regions Financial
RF
$26.5B
| $18K | ﹤0.01% |
110
-137
| -55% | -$2.6K |
|
3473
CALL
Texas Capital Bancshares
TCBI
$4.3B
| $18K | ﹤0.01% |
91
-150
| -62% | -$14.1K |
|
|
TGNA
3474
DELISTED
TEGNA Inc
TGNA
| $18K | ﹤0.01% |
+1,659
| New | +$22.7K |
|
|
UCTT
3475
CALL
Ultra Clean Holdings
UCTT
$3.24B
| $18K | ﹤0.01% |
132
-343
| -72% | -$7.23K |
|
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.