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 | |
|---|---|---|---|---|---|---|
976
PUT
Range Resources
RRC
$9.08B
| $309K | 0.01% |
584
-512
| -47% | -$9.21K |
|
977
Boise Cascade
BCC
$2.69B
| $308K | 0.01% |
+7,744
| New | +$287K |
|
978
Exelon
EXC
$48.4B
| $308K | 0.01% |
+10,982
| New | +$316K |
|
|
PARA
979
PUT
DELISTED
Paramount Global Class B
PARA
| $308K | 0.01% |
2,892
+2,110
| +270% | +$121K |
|
980
Pediatrix Medical
MD
$2.1B
| $307K | 0.01% |
5,752
+4,969
| +635% | +$234K |
|
981
XPO
XPO
$25.1B
| $307K | 0.01% |
+9,692
| New | +$248K |
|
|
JNPR
982
CALL
DELISTED
Juniper Networks
JNPR
| $306K | 0.01% |
2,933
+2,531
| +630% | +$68.4K |
|
983
PUT
Lockheed Martin
LMT
$131B
| $306K | 0.01% |
1,078
+457
| +74% | +$144K |
|
|
SPLK
984
CALL
DELISTED
Splunk Inc
SPLK
| $306K | 0.01% |
386
+10
| +3% | +$734 |
|
|
XLNX
985
CALL
DELISTED
Xilinx Inc
XLNX
| $306K | 0.01% |
1,025
-331
| -24% | -$23.5K |
|
|
CPN
986
DELISTED
Calpine Corporation
CPN
| $306K | 0.01% |
+20,271
| New | +$304K |
|
987
Manitowoc
MTW
$503M
| $305K | 0.01% |
7,774
+2,936
| +61% | +$114K |
|
|
WP
988
DELISTED
Worldpay, Inc.
WP
| $305K | 0.01% |
4,158
+3,362
| +422% | +$240K |
|
989
Acadia Pharmaceuticals
ACAD
$4.25B
| $303K | 0.01% |
10,077
-11,149
| -53% | -$357K |
|
|
AVP
990
DELISTED
Avon Products, Inc.
AVP
| $303K | 0.01% |
141,079
+59,671
| +73% | +$128K |
|
|
FINL
991
CALL
DELISTED
Finish Line
FINL
| $303K | 0.01% |
1,157
+1,049
| +971% | +$11.3K |
|
992
First Trust Dow Jones Internet Index Fund ETF
FDN
$4.84B
| $302K | 0.01% |
+2,755
| New | +$296K |
|
993
PUT
ProShares UltraShort Industrials
SIJ
$5.78M
| $302K | 0.01% |
38
-55
| -59% | -$16K |
|
994
Corpay
CPAY
$23.8B
| $302K | 0.01% |
1,571
-7,849
| -83% | -$1.38M |
|
995
American Superconductor
AMSC
$1.6B
| $301K | 0.01% |
+83,094
| New | +$317K |
|
996
PUT
The Mosaic Company
MOS
$7.08B
| $301K | 0.01% |
1,148
-86
| -7% | -$1.98K |
|
997
PUT
TAL Education Group
TAL
$5.74B
| $301K | 0.01% |
1,631
+675
| +71% | +$20.5K |
|
|
LVNTA
998
DELISTED
Liberty Interactive Corporation Series A Liberty Ventures
LVNTA
| $301K | 0.01% |
+5,551
| New | +$316K |
|
999
CALL
General Mills
GIS
$19B
| $300K | 0.01% |
868
-444
| -34% | -$24K |
|
1000
National Healthcare
NHC
$3.46B
| $300K | 0.01% |
4,933
-10,595
| -68% | -$676K |
|
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.