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 | |
|---|---|---|---|---|---|---|
251
iShares Select Dividend ETF
DVY
$23.8B
| $1.54M | 0.07% |
15,626
+1,971
| +14% | +$190K |
|
|
SAGE
252
CALL
DELISTED
Sage Therapeutics
SAGE
| $1.54M | 0.07% |
279
+125
| +81% | +$12.1K |
|
|
PPLI
253
People Inc
PPLI
$3.22B
| $1.54M | 0.07% |
70,396
+60,369
| +602% | +$1.35M |
|
|
ZAYO
254
DELISTED
Zayo Group Holdings, Inc.
ZAYO
| $1.53M | 0.07% |
41,628
+20,388
| +96% | +$721K |
|
255
CALL
United Rentals
URI
$64.9B
| $1.53M | 0.07% |
532
-1,267
| -70% | -$193K |
|
|
ULTI
256
DELISTED
Ultimate Software Group Inc
ULTI
| $1.53M | 0.07% |
+7,004
| New | +$1.42M |
|
257
CALL
Southwest Airlines
LUV
$23.3B
| $1.52M | 0.07% |
3,216
+32
| +1% | +$1.88K |
|
258
PUT
Microsoft
MSFT
$2.89T
| $1.5M | 0.06% |
9,604
+1,908
| +25% | +$157K |
|
259
CALL
Nektar Therapeutics
NKTR
$2.35B
| $1.5M | 0.06% |
33
+24
| +267% | +$14.2K |
|
260
CALL
Align Technology
ALGN
$12.4B
| $1.49M | 0.06% |
689
+169
| +33% | +$38.4K |
|
261
CALL
Direxion Daily Technology Bull 3x ETF
TECL
$5.57B
| $1.49M | 0.06% |
32,630
-4,300
| -12% | -$45.8K |
|
262
SiriusXM
SIRI
$10.1B
| $1.48M | 0.06% |
27,683
+22,656
| +451% | +$1.25M |
|
263
CALL
Weibo
WB
$1.93B
| $1.48M | 0.06% |
836
-53
| -6% | -$5.48K |
|
|
SAVE
264
DELISTED
Spirit Airlines, Inc.
SAVE
| $1.48M | 0.06% |
33,046
+30,527
| +1,212% | +$1.17M |
|
|
ATVI
265
CALL
DELISTED
Activision Blizzard
ATVI
| $1.48M | 0.06% |
2,548
+288
| +13% | +$18.2K |
|
266
New Oriental
EDU
$7.75B
| $1.48M | 0.06% |
15,757
+13,544
| +612% | +$1.2M |
|
267
Spectrum Brands
SPB
$2.04B
| $1.48M | 0.06% |
13,139
+8,268
| +170% | +$904K |
|
268
CALL
NXP Semiconductors
NXPI
$70.4B
| $1.47M | 0.06% |
1,413
-500
| -26% | -$57.8K |
|
269
CALL
Wells Fargo
WFC
$262B
| $1.47M | 0.06% |
6,759
+3,882
| +135% | +$219K |
|
270
PUT
Shopify
SHOP
$153B
| $1.45M | 0.06% |
17,410
-3,830
| -18% | -$39.2K |
|
271
CALL
Valero Energy
VLO
$92.5B
| $1.45M | 0.06% |
1,877
+23
| +1% | +$1.9K |
|
|
VXX
272
CALL
DELISTED
iPath S&P 500 VIX Short-Term Futures ETN due 1/30/2019
VXX
| $1.44M | 0.06% |
9,661
-4,688
| -33% | -$155K |
|
273
State Street SPDR EURO STOXX 50 ETF
FEZ
$4.33B
| $1.41M | 0.06% |
+34,692
| New | +$1.43M |
|
274
CALL
Cisco
CSCO
$443B
| $1.41M | 0.06% |
4,715
+2,001
| +74% | +$71.5K |
|
275
CALL
Capri Holdings
CPRI
$1.84B
| $1.4M | 0.06% |
1,311
-175
| -12% | -$9.59K |
|
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.