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 | |
|---|---|---|---|---|---|---|
651
Aon
AON
$75.2B
| $569K | 0.02% |
+4,249
| New | +$605K |
|
652
Conduent
CNDT
$234M
| $568K | 0.02% |
35,193
-6,585
| -16% | -$103K |
|
653
Cintas
CTAS
$80.6B
| $568K | 0.02% |
14,600
+10,452
| +252% | +$397K |
|
654
CALL
Johnson & Johnson
JNJ
$615B
| $568K | 0.02% |
2,148
-1,387
| -39% | -$193K |
|
655
Canadian Solar
CSIQ
$1.05B
| $567K | 0.02% |
33,649
+29,455
| +702% | +$506K |
|
656
Charles River Laboratories
CRL
$10.5B
| $563K | 0.02% |
5,150
+4,322
| +522% | +$470K |
|
|
DISH
657
PUT
DELISTED
DISH Network Corp.
DISH
| $563K | 0.02% |
1,800
+572
| +47% | +$28.5K |
|
658
Sony
SONY
$123B
| $561K | 0.02% |
62,450
+50,720
| +432% | +$436K |
|
659
Axogen
AXGN
$2.09B
| $560K | 0.02% |
+19,793
| New | +$467K |
|
660
CALL
Emerson Electric
EMR
$78.2B
| $560K | 0.02% |
917
-623
| -40% | -$40.4K |
|
|
LJPC
661
DELISTED
La Jolla Pharmaceutical Company
LJPC
| $560K | 0.02% |
17,421
+10,260
| +143% | +$335K |
|
662
PUT
Newell Brands
NWL
$2.29B
| $559K | 0.02% |
2,678
+1,544
| +136% | +$53.2K |
|
663
Assembly Biosciences
ASMB
$516M
| $558K | 0.02% |
1,029
+430
| +72% | +$195K |
|
664
CALL
NetApp
NTAP
$32.6B
| $557K | 0.02% |
619
+333
| +116% | +$16.7K |
|
665
PUT
AbbVie
ABBV
$448B
| $555K | 0.02% |
4,087
+1,702
| +71% | +$160K |
|
666
CALL
Ambarella
AMBA
$3.03B
| $555K | 0.02% |
946
+85
| +10% | +$4.72K |
|
|
VMW
667
CALL
DELISTED
VMware, Inc
VMW
| $555K | 0.02% |
579
-860
| -60% | -$103K |
|
668
Rithm Capital
RITM
$5.1B
| $553K | 0.02% |
30,981
+23,340
| +305% | +$411K |
|
669
CALL
Ulta Beauty
ULTA
$20.8B
| $548K | 0.02% |
758
-130
| -15% | -$27.5K |
|
|
NS
670
DELISTED
NuStar Energy L.P.
NS
| $548K | 0.02% |
18,322
+17,122
| +1,427% | +$555K |
|
671
Monro
MNRO
$526M
| $546K | 0.02% |
9,589
+8,865
| +1,224% | +$462K |
|
|
CLR
672
CALL
DELISTED
CONTINENTAL RESOURCES INC.
CLR
| $544K | 0.02% |
681
+111
| +19% | +$4.87K |
|
673
DXC Technology
DXC
$1.53B
| $543K | 0.02% |
6,617
-295
| -4% | -$23.8K |
|
674
PUT
Direxion Daily Technology Bull 3x ETF
TECL
$5.56B
| $541K | 0.02% |
67,020
+5,400
| +9% | +$57.5K |
|
675
The Greenbrier Companies
GBX
$1.58B
| $540K | 0.02% |
10,138
-2,261
| -18% | -$113K |
|
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.