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 |
Amazon
AMZN
|
+$45.9M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$30.1M |
| 3 |
TWX
Time Warner Inc
TWX
|
+$25.8M |
| 4 |
Booking.com
BKNG
|
+$22.5M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$17.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$43.6M |
| 2 |
Amgen
AMGN
|
+$33.2M |
| 3 |
Baidu
BIDU
|
+$19.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$17.3M |
| 5 |
Micron Technology
MU
|
+$17.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 14.31% |
| 2 | Technology | 13.17% |
| 3 | Communication Services | 11.81% |
| 4 | Healthcare | 4.06% |
| 5 | Financials | 3.84% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1426
CALL
Automatic Data Processing
ADP
$99.7B
| $145K | 0.01% |
321
-333
| -51% | -$35.7K |
|
1427
PUT
Dollar Tree
DLTR
$23.1B
| $145K | 0.01% |
807
-93
| -10% | -$7.1K |
|
|
BLCM
1428
DELISTED
Bellicum Pharmaceuticals, Inc.
BLCM
| $145K | 0.01% |
1,258
+838
| +200% | +$88.2K |
|
|
STMP
1429
DELISTED
Stamps.com, Inc.
STMP
| $145K | 0.01% |
+718
| New | +$132K |
|
|
QUOT
1430
CALL
DELISTED
Quotient Technology Inc
QUOT
| $144K | 0.01% |
600
+140
| +30% | +$1.93K |
|
|
XLNX
1431
PUT
DELISTED
Xilinx Inc
XLNX
| $144K | 0.01% |
497
-36
| -7% | -$2.35K |
|
|
CXO
1432
CALL
DELISTED
CONCHO RESOURCES INC.
CXO
| $144K | 0.01% |
261
+112
| +75% | +$13.5K |
|
1433
PUT
Lowe's Companies
LOW
$116B
| $143K | 0.01% |
2,430
-1,211
| -33% | -$92.7K |
|
1434
MaxLinear
MXL
$6.36B
| $143K | 0.01% |
6,022
+5,488
| +1,028% | +$132K |
|
1435
CALL
Packaging Corp of America
PKG
$22.2B
| $143K | 0.01% |
430
+338
| +367% | +$37.8K |
|
1436
CALL
Vulcan Materials
VMC
$36.3B
| $143K | 0.01% |
648
+511
| +373% | +$61.3K |
|
|
CZR
1437
CALL
DELISTED
Caesars Entertainment Corporation
CZR
| $143K | 0.01% |
2,385
+1,239
| +108% | +$15K |
|
1438
CALL
ATI
ATI
$27.3B
| $142K | 0.01% |
374
+49
| +15% | +$969 |
|
1439
AeroVironment
AVAV
$7.64B
| $142K | 0.01% |
+2,627
| New | +$112K |
|
1440
Insulet
PODD
$11.4B
| $142K | 0.01% |
2,593
+1,789
| +223% | +$97.7K |
|
|
TWTR
1441
CALL
DELISTED
Twitter, Inc.
TWTR
| $142K | 0.01% |
4,823
-1,954
| -29% | -$34.1K |
|
|
HNP
1442
PUT
DELISTED
Huaneng Power Intl, Inc.
HNP
| $142K | 0.01% |
181
+15
| +9% | +$397 |
|
1443
CALL
Cleveland-Cliffs
CLF
$6.84B
| $141K | 0.01% |
619
-209
| -25% | -$1.56K |
|
1444
Repligen
RGEN
$7.56B
| $141K | 0.01% |
+3,685
| New | +$154K |
|
1445
CALL
Delek US
DK
$3.91B
| $140K | 0.01% |
839
+215
| +34% | +$5.38K |
|
1446
PUT
W.W. Grainger
GWW
$65.1B
| $140K | 0.01% |
142
-52
| -27% | -$8.77K |
|
1447
PUT
Coca-Cola
KO
$353B
| $140K | 0.01% |
1,212
-1,968
| -62% | -$89.5K |
|
1448
CALL
Nucor
NUE
$56.6B
| $140K | 0.01% |
808
-71
| -8% | -$4.01K |
|
1449
CALL
Yum China
YUMC
$14.8B
| $140K | 0.01% |
468
-888
| -65% | -$33.1K |
|
|
CLVS
1450
PUT
DELISTED
Clovis Oncology, Inc.
CLVS
| $140K | 0.01% |
917
-322
| -26% | -$25.5K |
|
Similar funds
Simplex Trading's Q3 2017 Portfolio in Review
As of Q3 2017, Simplex Trading held 7,357 positions worth $2.45B, up 6.4% from $2.3B the previous quarter. Its ten largest holdings account for 24% of the portfolio.
Simplex Trading's Q3 2017 filing shows 1,313 new, 2,078 increased, 2,339 reduced and 1,500 closed positions. Its largest new stake was iShares Russell 2000 ETF: 214,170 shares worth $31.7M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $43.6M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, up from 9.7% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q3 2017 buy was iShares Russell 2000 ETF: 214,170 shares worth $31.7M.
- Simplex Trading added most to Amazon in Q3 2017, an estimated $45.9M increase.
- Simplex Trading's biggest Q3 2017 reduction was Baidu, cutting an estimated $19.3M.
- Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q3 2017, selling an estimated $43.6M.
- Simplex Trading's ten largest holdings make up 24% of its $2.45B portfolio in Q3 2017.
- Simplex Trading opened 1,313 new positions and closed 1,500 in Q3 2017.
- Simplex Trading's portfolio value rose 6.4% quarter-over-quarter to $2.45B.
Based on Simplex Trading's 13F filing for Q3 2017, filed 25 Oct 2017.