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 | |
|---|---|---|---|---|---|---|
1701
CALL
Masco
MAS
$16B
| $114K | ﹤0.01% |
884
+383
| +76% | +$15.6K |
|
1702
Pitney Bowes
PBI
$2.42B
| $114K | ﹤0.01% |
10,212
-6,109
| -37% | -$72K |
|
1703
PUT
Royal Caribbean
RCL
$78.7B
| $114K | ﹤0.01% |
1,991
-30
| -1% | -$3.71K |
|
1704
CALL
YPF
YPF
$20.2B
| $114K | ﹤0.01% |
1,555
+283
| +22% | +$6.49K |
|
1705
PUT
Aptiv
APTV
$12B
| $113K | ﹤0.01% |
605
+283
| +88% | +$26.9K |
|
1706
PUT
Cleveland-Cliffs
CLF
$6.81B
| $113K | ﹤0.01% |
543
-1,329
| -71% | -$8.84K |
|
1707
PUT
Estee Lauder
EL
$29B
| $113K | ﹤0.01% |
573
-366
| -39% | -$44K |
|
1708
CALL
Fortinet
FTNT
$112B
| $113K | ﹤0.01% |
1,755
+15
| +0.9% | +$122 |
|
|
ADAM
1709
Adamas Trust
ADAM
$777M
| $113K | ﹤0.01% |
4,600
+4,465
| +3,307% | +$112K |
|
1710
PUT
OSI Systems
OSIS
$3.57B
| $113K | ﹤0.01% |
295
+81
| +38% | +$6.81K |
|
|
EMWP
1711
PUT
DELISTED
Eros Media World PLC
EMWP
| $113K | ﹤0.01% |
20
-7
| -26% | -$1.72K |
|
1712
Cameco
CCJ
$38.3B
| $112K | ﹤0.01% |
+12,223
| New | +$115K |
|
1713
Ironwood Pharmaceuticals
IRWD
$611M
| $112K | ﹤0.01% |
9,000
+5,818
| +183% | +$76K |
|
1714
PUT
Impinj
PI
$3.89B
| $112K | ﹤0.01% |
194
-390
| -67% | -$11.2K |
|
1715
PUT
Simon Property Group
SPG
$74.5B
| $112K | ﹤0.01% |
1,703
+381
| +29% | +$61.9K |
|
|
FMI
1716
CALL
DELISTED
Foundation Medicine, Inc.
FMI
| $112K | ﹤0.01% |
110
+52
| +90% | +$2.7K |
|
1717
Cal-Maine
CALM
$4.28B
| $111K | ﹤0.01% |
+2,509
| New | +$112K |
|
1718
CALL
Eaton
ETN
$157B
| $111K | ﹤0.01% |
383
-313
| -45% | -$24.3K |
|
1719
PUT
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$27B
| $111K | ﹤0.01% |
283
+11
| +4% | +$3.71K |
|
1720
PUT
SITE Centers
SITC
$230M
| $111K | ﹤0.01% |
790
+400
| +103% | +$4.26K |
|
1721
Suburban Propane Partners
SPH
$1.23B
| $111K | ﹤0.01% |
+4,606
| New | +$115K |
|
1722
CALL
Winnebago Industries
WGO
$870M
| $111K | ﹤0.01% |
210
+157
| +296% | +$7.88K |
|
1723
ZTO Express
ZTO
$18.2B
| $111K | ﹤0.01% |
+7,063
| New | +$111K |
|
|
NVTA
1724
CALL
DELISTED
Invitae Corporation
NVTA
| $111K | ﹤0.01% |
532
+506
| +1,946% | +$4.54K |
|
|
GHDX
1725
DELISTED
Genomic Health, Inc.
GHDX
| $111K | ﹤0.01% |
+3,259
| New | +$104K |
|
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.