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 | |
|---|---|---|---|---|---|---|
401
Jacobs Solutions
J
$15.6B
| $981K | 0.04% |
20,052
+8,457
| +73% | +$448K |
|
|
LOMA
402
Loma Negra
LOMA
$1.39B
| $979K | 0.04% |
+45,929
| New | +$1.04M |
|
403
CALL
Direxion Daily Technology Bull 3x ETF
TECL
$5.39B
| $979K | 0.04% |
38,760
+6,130
| +19% | +$78.1K |
|
404
PUT
Merck
MRK
$322B
| $971K | 0.04% |
3,459
+567
| +20% | +$30.6K |
|
405
CALL
IBM
IBM
$194B
| $966K | 0.04% |
4,840
+1,666
| +52% | +$252K |
|
406
CALL
Cencora
COR
$59.4B
| $965K | 0.04% |
11,045
+10,729
| +3,395% | +$1.03M |
|
|
XYZ
407
CALL
Block Inc
XYZ
$45.5B
| $965K | 0.04% |
4,377
+2,637
| +152% | +$121K |
|
408
iShares China Large-Cap ETF
FXI
$4.29B
| $964K | 0.04% |
+20,407
| New | +$1M |
|
|
SGMO
409
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $957K | 0.04% |
+50,400
| New | +$1.08M |
|
|
GLIBA
410
DELISTED
GCI Liberty, Inc. Class A Common Stock (DE)
GLIBA
| $956K | 0.04% |
+18,104
| New | +$949K |
|
411
EOG Resources
EOG
$77.5B
| $952K | 0.04% |
9,046
-870
| -9% | -$93.8K |
|
412
Cintas
CTAS
$81.3B
| $951K | 0.04% |
22,316
+7,716
| +53% | +$320K |
|
413
Freeport-McMoran
FCX
$91.3B
| $951K | 0.04% |
54,176
-118,574
| -69% | -$2.23M |
|
414
PUT
Home Depot
HD
$324B
| $950K | 0.04% |
3,439
-2,241
| -39% | -$420K |
|
|
QCP
415
DELISTED
Quality Care Properties, Inc.
QCP
| $949K | 0.04% |
48,858
+48,699
| +30,628% | +$727K |
|
|
JO
416
DELISTED
iPath Bloomberg Coffee Subindex Total Return ETN due June 24, 2038
JO
| $948K | 0.04% |
66,152
+57,880
| +700% | +$869K |
|
|
APC
417
DELISTED
Anadarko Petroleum
APC
| $944K | 0.04% |
15,639
-3,531
| -18% | -$207K |
|
418
Patterson-UTI
PTEN
$3.93B
| $937K | 0.04% |
+53,555
| New | +$1.12M |
|
|
ARNA
419
DELISTED
Arena Pharmaceuticals Inc
ARNA
| $935K | 0.04% |
23,682
+8,365
| +55% | +$325K |
|
420
CALL
SPX Corp
SPXC
$11B
| $926K | 0.04% |
28,535
+28,361
| +16,299% | +$898K |
|
421
PUT
Intel
INTC
$504B
| $925K | 0.04% |
5,034
-1,791
| -26% | -$85.1K |
|
422
PUT
Chipotle Mexican Grill
CMG
$41.1B
| $924K | 0.04% |
48,450
-96,200
| -67% | -$606K |
|
423
KKR & Co
KKR
$86.2B
| $924K | 0.04% |
+45,544
| New | +$1.01M |
|
424
PUT
Incyte
INCY
$23.3B
| $922K | 0.04% |
915
+259
| +39% | +$23.4K |
|
|
HOME
425
DELISTED
At Home Group Inc.
HOME
| $921K | 0.04% |
28,763
+28,725
| +75,592% | +$882K |
|
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.