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 |
CELG
Celgene Corp
CELG
|
+$31.6M |
| 2 |
Citigroup
C
|
+$19.5M |
| 3 |
AGN
Allergan plc
AGN
|
+$18.4M |
| 4 |
Baidu
BIDU
|
+$18M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$14.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$81.3M |
| 2 |
NVIDIA
NVDA
|
+$60.2M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$48.2M |
| 4 |
Apple
AAPL
|
+$48.2M |
| 5 |
Meta Platforms (Facebook)
META
|
+$31.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 11.27% |
| 2 | Technology | 10.64% |
| 3 | Healthcare | 7.06% |
| 4 | Communication Services | 6.92% |
| 5 | Industrials | 5.66% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
826
CALL
Ubiquiti
UI
$31.9B
| $409K | 0.02% |
385
-94
| -20% | -$6.02K |
|
827
Direxion Daily S&P Oil & Gas Exp. & Prod. Bull 2X ETF
GUSH
$258M
| $408K | 0.02% |
134
-51
| -28% | -$130K |
|
|
BID
828
DELISTED
Sotheby's
BID
| $405K | 0.02% |
+7,855
| New | +$392K |
|
829
PUT
Chevron
CVX
$391B
| $403K | 0.02% |
4,826
+1,029
| +27% | +$122K |
|
830
Jazz Pharmaceuticals
JAZZ
$15.9B
| $403K | 0.02% |
2,993
+2,320
| +345% | +$322K |
|
831
CALL
Altria Group
MO
$120B
| $402K | 0.02% |
2,174
-791
| -27% | -$53K |
|
832
CALL
Simon Property Group
SPG
$73.3B
| $402K | 0.02% |
556
-725
| -57% | -$118K |
|
833
PUT
Weibo
WB
$1.91B
| $402K | 0.02% |
887
+265
| +43% | +$27.4K |
|
|
SDRL
834
PUT
DELISTED
Seadrill Limited Common Stock
SDRL
| $400K | 0.02% |
9
| – | – |
|
835
Agios Pharmaceuticals
AGIO
$2.14B
| $399K | 0.02% |
6,994
+6,957
| +18,803% | +$438K |
|
836
Extreme Networks
EXTR
$3.86B
| $399K | 0.02% |
31,888
+23,460
| +278% | +$289K |
|
837
PUT
PayPal
PYPL
$49.2B
| $399K | 0.02% |
3,448
-2,822
| -45% | -$204K |
|
|
YELL
838
DELISTED
Yellow Corporation Common Stock
YELL
| $399K | 0.02% |
+27,758
| New | +$366K |
|
839
Brookdale Senior Living
BKD
$3.49B
| $398K | 0.02% |
41,121
+8,780
| +27% | +$89.5K |
|
840
iShares Russell 1000 ETF
IWB
$47.7B
| $398K | 0.02% |
+2,682
| New | +$388K |
|
841
uniQure
QURE
$2.71B
| $398K | 0.02% |
+20,321
| New | +$309K |
|
842
Advanced Energy
AEIS
$12.6B
| $397K | 0.02% |
5,888
-16,937
| -74% | -$1.36M |
|
843
BlackBerry
BB
$5.03B
| $397K | 0.02% |
35,591
-159,368
| -82% | -$1.74M |
|
844
Global X Silver Miners ETF NEW
SIL
$4.05B
| $395K | 0.02% |
12,116
+5,259
| +77% | +$168K |
|
|
CNH
845
CNH Industrial
CNH
$13.4B
| $395K | 0.02% |
+33,932
| New | +$375K |
|
846
Varex Imaging
VREX
$445M
| $394K | 0.02% |
9,829
+4,386
| +81% | +$158K |
|
|
DATA
847
CALL
DELISTED
Tableau Software, Inc.
DATA
| $394K | 0.02% |
263
+4
| +2% | +$294 |
|
848
CNX Resources
CNX
$4.93B
| $393K | 0.02% |
26,878
+3,225
| +14% | +$44.5K |
|
|
CLDR
849
DELISTED
Cloudera, Inc.
CLDR
| $393K | 0.02% |
+23,833
| New | +$384K |
|
850
ProShares UltraPro Short S&P 500
SPXU
$438M
| $392K | 0.02% |
86
+77
| +856% | +$384K |
|
Similar funds
Simplex Trading's Q4 2017 Portfolio in Review
As of Q4 2017, Simplex Trading held 7,407 positions worth $2.32B, down 5.1% from $2.45B the previous quarter. Its ten largest holdings account for 17% of the portfolio.
Simplex Trading withdrew a net $315M in Q4 2017, closing 1,460 positions and reducing 2,239 holdings. Its most notable exit was iShares 20+ Year Treasury Bond ETF, an estimated $21.1M position sold in full.
By sector, the portfolio is most concentrated in Consumer Discretionary at 11% of assets, down from 14% a quarter earlier, followed by Technology and Healthcare.
Against the trend, Simplex Trading opened a new position in Celgene Corp worth $29.2M.
- Simplex Trading's largest Q4 2017 buy was Celgene Corp: 280,194 shares worth $29.2M.
- Simplex Trading added most to Baidu in Q4 2017, an estimated $18M increase.
- Simplex Trading's biggest Q4 2017 reduction was Amazon, cutting an estimated $81.3M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q4 2017, selling an estimated $21.1M.
- Simplex Trading's ten largest holdings make up 17% of its $2.32B portfolio in Q4 2017.
- Simplex Trading opened 1,548 new positions and closed 1,460 in Q4 2017.
- Simplex Trading's portfolio value fell 5.1% quarter-over-quarter to $2.32B.
Based on Simplex Trading's 13F filing for Q4 2017, filed 10 Jan 2018.