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 | |
|---|---|---|---|---|---|---|
2351
CALL
3D Systems Corp
DDD
$420M
| $55K | ﹤0.01% |
1,384
+1,092
| +374% | +$11.2K |
|
2352
PUT
Fossil Group
FOSL
$239M
| $55K | ﹤0.01% |
212
-208
| -50% | -$1.61K |
|
2353
PUT
Kohl's
KSS
$2.03B
| $55K | ﹤0.01% |
756
-352
| -32% | -$16.2K |
|
2354
Lattice Semiconductor
LSCC
$17.6B
| $55K | ﹤0.01% |
9,577
+6,084
| +174% | +$35.7K |
|
2355
PUT
Mid-America Apartment Communities
MAA
$15.6B
| $55K | ﹤0.01% |
318
+170
| +115% | +$17.6K |
|
2356
MSCI
MSCI
$40B
| $55K | ﹤0.01% |
+441
| New | +$55K |
|
2357
NiSource
NI
$22.4B
| $55K | ﹤0.01% |
+2,144
| New | +$56.9K |
|
2358
PUT
Plains All American Pipeline
PAA
$17.4B
| $55K | ﹤0.01% |
512
+70
| +16% | +$1.43K |
|
2359
Pacific Biosciences
PACB
$422M
| $55K | ﹤0.01% |
+20,976
| New | +$73.4K |
|
2360
CALL
TransUnion
TRU
$14.8B
| $55K | ﹤0.01% |
148
-31
| -17% | -$1.65K |
|
2361
Vanguard Materials ETF
VAW
$3B
| $55K | ﹤0.01% |
+404
| New | +$53.7K |
|
|
VRNT
2362
DELISTED
Verint Systems
VRNT
| $55K | ﹤0.01% |
+2,613
| New | +$56.2K |
|
|
MODN
2363
DELISTED
MODEL N, INC.
MODN
| $55K | ﹤0.01% |
+3,516
| New | +$52.9K |
|
|
SIEN
2364
DELISTED
Sientra, Inc.
SIEN
| $55K | ﹤0.01% |
+397
| New | +$57.7K |
|
|
FLXN
2365
CALL
DELISTED
Flexion Therapeutics, Inc.
FLXN
| $55K | ﹤0.01% |
243
-196
| -45% | -$4.8K |
|
|
SIGM
2366
CALL
DELISTED
Sigma Designs Inc
SIGM
| $55K | ﹤0.01% |
550
+354
| +181% | +$2.22K |
|
2367
Baytex Energy
BTE
$3.08B
| $54K | ﹤0.01% |
18,152
+7,768
| +75% | +$22.9K |
|
2368
CALL
Centene
CNC
$31.3B
| $54K | ﹤0.01% |
270
-166
| -38% | -$8.04K |
|
2369
CALL
CNX Resources
CNX
$4.85B
| $54K | ﹤0.01% |
225
-14
| -6% | -$193 |
|
2370
PUT
WisdomTree US Total Dividend Fund
DTD
$1.65B
| $54K | ﹤0.01% |
3,572
-876
| -20% | -$39.6K |
|
2371
PUT
Duke Energy
DUK
$102B
| $54K | ﹤0.01% |
472
-183
| -28% | -$16K |
|
2372
CALL
Hewlett Packard
HPE
$63.2B
| $54K | ﹤0.01% |
195
-3
| -2% | -$43 |
|
|
JWN
2373
PUT
DELISTED
Nordstrom
JWN
| $54K | ﹤0.01% |
1,122
-253
| -18% | -$10.9K |
|
2374
Kayne Anderson Energy Infrastructure Fund
KYN
$2.52B
| $54K | ﹤0.01% |
+2,854
| New | +$46.9K |
|
2375
Sabra Healthcare REIT
SBRA
$5.64B
| $54K | ﹤0.01% |
2,930
-9,271
| -76% | -$184K |
|
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.