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 |
Amazon
AMZN
|
+$45.9M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$30.1M |
| 3 |
TWX
Time Warner Inc
TWX
|
+$25.8M |
| 4 |
Booking.com
BKNG
|
+$22.5M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$17.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$43.6M |
| 2 |
Amgen
AMGN
|
+$33.2M |
| 3 |
Baidu
BIDU
|
+$19.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$17.3M |
| 5 |
Micron Technology
MU
|
+$17.1M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 14.31% |
| 2 | Technology | 13.17% |
| 3 | Communication Services | 11.81% |
| 4 | Healthcare | 4.06% |
| 5 | Financials | 3.84% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
251
CALL
Insmed
INSM
$23.2B
| $1.54M | 0.06% |
1,347
+1,074
| +393% | +$20.5K |
|
|
LN
252
DELISTED
LINE Corporation
LN
| $1.53M | 0.06% |
42,427
+12,060
| +40% | +$424K |
|
253
Cummins
CMI
$91.6B
| $1.51M | 0.06% |
+9,010
| New | +$1.46M |
|
254
PUT
Ulta Beauty
ULTA
$20.8B
| $1.5M | 0.06% |
1,250
+631
| +102% | +$152K |
|
255
CALL
eBay
EBAY
$49.4B
| $1.47M | 0.06% |
2,781
+1,122
| +68% | +$40.8K |
|
256
CALL
CarMax
KMX
$8.19B
| $1.47M | 0.06% |
1,301
-585
| -31% | -$39K |
|
257
Kimberly-Clark
KMB
$36.3B
| $1.46M | 0.06% |
+12,405
| New | +$1.51M |
|
|
TTM
258
DELISTED
Tata Motors Limited
TTM
| $1.46M | 0.06% |
46,662
-14,757
| -24% | -$475K |
|
259
Corpay
CPAY
$23.7B
| $1.46M | 0.06% |
9,420
-7,777
| -45% | -$1.14M |
|
260
Alnylam Pharmaceuticals
ALNY
$35.6B
| $1.46M | 0.06% |
+12,394
| New | +$1.06M |
|
261
CALL
Norfolk Southern
NSC
$74.5B
| $1.46M | 0.06% |
1,162
-94
| -7% | -$11.4K |
|
262
PUT
SLB Ltd
SLB
$71.1B
| $1.45M | 0.06% |
5,112
-2,789
| -35% | -$184K |
|
|
ICPT
263
PUT
DELISTED
Intercept Pharmaceuticals, Inc.
ICPT
| $1.45M | 0.06% |
463
+183
| +65% | +$19.7K |
|
264
Travel + Leisure Co
TNL
$4.78B
| $1.45M | 0.06% |
+30,383
| New | +$1.39M |
|
265
PUT
Starbucks
SBUX
$119B
| $1.44M | 0.06% |
3,717
-910
| -20% | -$50.4K |
|
266
T. Rowe Price
TROW
$24.9B
| $1.44M | 0.06% |
+15,893
| New | +$1.31M |
|
267
CALL
Stellantis
STLA
$16.8B
| $1.42M | 0.06% |
2,386
+399
| +20% | +$5.52K |
|
268
CALL
SPDR Gold Trust
GLD
$133B
| $1.42M | 0.06% |
7,157
+62
| +0.9% | +$7.54K |
|
269
Microchip Technology
MCHP
$46.1B
| $1.41M | 0.06% |
31,398
-12,758
| -29% | -$535K |
|
270
VF Corp
VFC
$6.71B
| $1.41M | 0.06% |
+23,516
| New | +$1.36M |
|
|
IRBT
271
DELISTED
iRobot
IRBT
| $1.4M | 0.06% |
18,172
+17,972
| +8,986% | +$1.65M |
|
272
iShares Russell 1000 Value ETF
IWD
$81.7B
| $1.4M | 0.06% |
+11,801
| New | +$1.38M |
|
273
Watsco Inc
WSO
$14.7B
| $1.4M | 0.06% |
8,669
+8,555
| +7,504% | +$1.29M |
|
|
X
274
PUT
DELISTED
US Steel
X
| $1.39M | 0.06% |
6,623
-5,798
| -47% | -$142K |
|
|
VALE.P
275
PUT
DELISTED
Vale S A
VALE.P
| $1.38M | 0.06% |
4,274
+1,615
| +61% | +$15.2K |
|
Similar funds
Simplex Trading's Q3 2017 Portfolio in Review
As of Q3 2017, Simplex Trading held 7,357 positions worth $2.45B, up 6.4% from $2.3B the previous quarter. Its ten largest holdings account for 24% of the portfolio.
Simplex Trading's Q3 2017 filing shows 1,313 new, 2,078 increased, 2,339 reduced and 1,500 closed positions. Its largest new stake was iShares Russell 2000 ETF: 214,170 shares worth $31.7M. The largest sale was State Street SPDR S&P 500 ETF Trust, an estimated $43.6M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 14% of assets, up from 9.7% a quarter earlier, followed by Technology and Communication Services.
- Simplex Trading's largest Q3 2017 buy was iShares Russell 2000 ETF: 214,170 shares worth $31.7M.
- Simplex Trading added most to Amazon in Q3 2017, an estimated $45.9M increase.
- Simplex Trading's biggest Q3 2017 reduction was Baidu, cutting an estimated $19.3M.
- Simplex Trading fully exited State Street SPDR S&P 500 ETF Trust in Q3 2017, selling an estimated $43.6M.
- Simplex Trading's ten largest holdings make up 24% of its $2.45B portfolio in Q3 2017.
- Simplex Trading opened 1,313 new positions and closed 1,500 in Q3 2017.
- Simplex Trading's portfolio value rose 6.4% quarter-over-quarter to $2.45B.
Based on Simplex Trading's 13F filing for Q3 2017, filed 25 Oct 2017.