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 | |
|---|---|---|---|---|---|---|
|
DISCK
1276
CALL
DELISTED
Discovery, Inc. Series C Common Stock
DISCK
| $199K | 0.01% |
1,394
+984
| +240% | +$18.1K |
|
|
EFII
1277
DELISTED
Electronics for Imaging
EFII
| $199K | 0.01% |
+6,750
| New | +$226K |
|
1278
Franklin Resources
BEN
$16.8B
| $198K | 0.01% |
+4,577
| New | +$198K |
|
1279
PUT
Mattel
MAT
$4.14B
| $198K | 0.01% |
1,685
+747
| +80% | +$11.8K |
|
|
MRO
1280
CALL
DELISTED
Marathon Oil Corporation
MRO
| $198K | 0.01% |
1,027
+897
| +690% | +$13.3K |
|
1281
PUT
ASML
ASML
$693B
| $197K | 0.01% |
367
-68
| -16% | -$12K |
|
1282
Essex Property Trust
ESS
$18.8B
| $197K | 0.01% |
+819
| New | +$207K |
|
1283
CALL
STMicroelectronics
STM
$47.7B
| $197K | 0.01% |
427
-1,589
| -79% | -$35.2K |
|
1284
CALL
Vodafone
VOD
$35.1B
| $197K | 0.01% |
1,502
+129
| +9% | +$3.87K |
|
1285
Fox Factory Holding Corp
FOXF
$765M
| $196K | 0.01% |
5,063
+656
| +15% | +$26.5K |
|
1286
Huntington Bancshares
HBAN
$35.2B
| $196K | 0.01% |
13,526
-2,653
| -16% | -$37.3K |
|
1287
KB Home
KBH
$3.41B
| $196K | 0.01% |
6,159
-8,047
| -57% | -$231K |
|
|
LOGM
1288
DELISTED
LogMein, Inc.
LOGM
| $196K | 0.01% |
1,715
-2,269
| -57% | -$267K |
|
|
S
1289
PUT
DELISTED
Sprint Corporation
S
| $196K | 0.01% |
1,765
+1,609
| +1,031% | +$10.2K |
|
1290
CALL
Tapestry
TPR
$28.1B
| $195K | 0.01% |
462
+19
| +4% | +$783 |
|
|
CTLT
1291
DELISTED
CATALENT, INC.
CTLT
| $195K | 0.01% |
+4,752
| New | +$193K |
|
|
CONN
1292
CALL
DELISTED
Conn's Inc.
CONN
| $195K | 0.01% |
285
-263
| -48% | -$8.04K |
|
|
ONCE
1293
CALL
DELISTED
Spark Therapeutics, Inc. Common Stock
ONCE
| $195K | 0.01% |
375
+43
| +13% | +$3.09K |
|
1294
CALL
MGP Ingredients
MGPI
$377M
| $194K | 0.01% |
+188
| New | +$13.3K |
|
1295
CALL
T-Mobile US
TMUS
$183B
| $194K | 0.01% |
938
-269
| -22% | -$16.4K |
|
1296
PUT
Analog Devices
ADI
$185B
| $193K | 0.01% |
1,440
+873
| +154% | +$77.3K |
|
1297
PUT
Charter Communications
CHTR
$15.6B
| $193K | 0.01% |
476
-47
| -9% | -$16K |
|
1298
Cinemark Holdings
CNK
$3.82B
| $193K | 0.01% |
5,550
+5,163
| +1,334% | +$183K |
|
1299
CALL
Freshpet
FRPT
$2.78B
| $193K | 0.01% |
454
-5
| -1% | -$87 |
|
|
MASI
1300
DELISTED
Masimo
MASI
| $193K | 0.01% |
2,276
+1,467
| +181% | +$127K |
|
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.