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 | |
|---|---|---|---|---|---|---|
276
CoStar Group
CSGP
$11.4B
| $1.38M | 0.06% |
37,940
+36,150
| +2,020% | +$1.25M |
|
277
SolarEdge
SEDG
$3.01B
| $1.38M | 0.06% |
+26,147
| New | +$1.15M |
|
278
CALL
VanEck Gold Miners ETF
GDX
$23.5B
| $1.37M | 0.06% |
10,570
+49
| +0.5% | +$1.11K |
|
279
Simon Property Group
SPG
$73.5B
| $1.36M | 0.06% |
8,808
-3,460
| -28% | -$550K |
|
|
TWTR
280
CALL
DELISTED
Twitter, Inc.
TWTR
| $1.35M | 0.06% |
7,179
-2,618
| -27% | -$76.7K |
|
281
General Mills
GIS
$19.8B
| $1.35M | 0.06% |
29,931
+10,314
| +53% | +$559K |
|
282
CALL
Western Digital
WDC
$193B
| $1.35M | 0.06% |
2,867
-3,342
| -54% | -$225K |
|
|
ALXN
283
PUT
DELISTED
Alexion Pharmaceuticals
ALXN
| $1.35M | 0.06% |
1,092
+390
| +56% | +$46.6K |
|
|
CLDR
284
DELISTED
Cloudera, Inc.
CLDR
| $1.34M | 0.06% |
62,177
+38,344
| +161% | +$720K |
|
285
PUT
Johnson & Johnson
JNJ
$615B
| $1.34M | 0.06% |
2,148
-907
| -30% | -$123K |
|
286
CALL
Tapestry
TPR
$28.9B
| $1.34M | 0.06% |
24,610
+24,148
| +5,227% | +$1.19M |
|
287
CALL
Cars.com
CARS
$648M
| $1.33M | 0.06% |
46,270
+45,933
| +13,630% | +$1.34M |
|
288
TechnipFMC
FTI
$29.8B
| $1.33M | 0.06% |
60,733
+7,171
| +13% | +$166K |
|
|
PRMW
289
CALL
DELISTED
Primo Water Corporation
PRMW
| $1.33M | 0.06% |
113,587
+112,996
| +19,119% | +$1.4M |
|
290
Agios Pharmaceuticals
AGIO
$2.16B
| $1.33M | 0.06% |
16,234
+9,240
| +132% | +$714K |
|
|
NBIS
291
Nebius Group N.V.
NBIS
$57.2B
| $1.32M | 0.06% |
33,441
+7,837
| +31% | +$308K |
|
|
CXO
292
DELISTED
CONCHO RESOURCES INC.
CXO
| $1.32M | 0.06% |
+8,772
| New | +$1.34M |
|
293
CALL
W.W. Grainger
GWW
$63.7B
| $1.32M | 0.06% |
261
-170
| -39% | -$44.5K |
|
294
ProShares Ultra Bloomberg Crude Oil
UCO
$429M
| $1.31M | 0.06% |
+7,650
| New | +$1.23M |
|
295
CALL
Visa
V
$678B
| $1.31M | 0.06% |
5,375
+1,769
| +49% | +$214K |
|
296
Ciena
CIEN
$57.4B
| $1.31M | 0.06% |
50,693
-2,450
| -5% | -$57.7K |
|
297
State Street SPDR Bloomberg High Yield Bond ETF
JNK
$7.26B
| $1.31M | 0.06% |
12,172
+8,182
| +205% | +$891K |
|
298
State Street Materials Select Sector SPDR ETF
XLB
$8.43B
| $1.3M | 0.06% |
+45,850
| New | +$1.39M |
|
299
Banco Macro
BMA
$6.12B
| $1.3M | 0.06% |
12,046
+11,834
| +5,582% | +$1.28M |
|
300
Charles River Laboratories
CRL
$10.6B
| $1.3M | 0.06% |
12,178
+7,028
| +136% | +$758K |
|
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.