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 | |
|---|---|---|---|---|---|---|
276
Trade Desk
TTD
$8.22B
| $1.38M | 0.06% |
+224,150
| New | +$1.21M |
|
277
Boston Scientific
BSX
$63.7B
| $1.38M | 0.06% |
47,170
+31,441
| +200% | +$868K |
|
278
PUT
Gilead Sciences
GILD
$162B
| $1.37M | 0.06% |
5,287
-2,360
| -31% | -$180K |
|
|
SAGE
279
DELISTED
Sage Therapeutics
SAGE
| $1.37M | 0.06% |
21,938
+12,680
| +137% | +$996K |
|
280
PUT
GE Aerospace
GE
$354B
| $1.36M | 0.06% |
1,282
-163
| -11% | -$19.7K |
|
281
Everest Group
EG
$14.8B
| $1.36M | 0.06% |
5,955
+3,751
| +170% | +$945K |
|
|
MXIM
282
DELISTED
Maxim Integrated Products
MXIM
| $1.36M | 0.06% |
28,487
+4,666
| +20% | +$214K |
|
283
CALL
General Motors
GM
$73.9B
| $1.35M | 0.06% |
5,368
+1,888
| +54% | +$69K |
|
284
Assured Guaranty
AGO
$3.73B
| $1.35M | 0.06% |
35,774
+27,890
| +354% | +$1.19M |
|
285
Pacira BioSciences
PCRX
$1B
| $1.35M | 0.06% |
+35,959
| New | +$1.45M |
|
286
Invesco DB US Dollar Index Bullish Fund
UUP
$433M
| $1.35M | 0.06% |
55,791
+53,164
| +2,024% | +$1.29M |
|
287
Thor Industries
THO
$4.02B
| $1.35M | 0.06% |
10,714
+7,900
| +281% | +$852K |
|
288
CALL
Weibo
WB
$1.93B
| $1.34M | 0.05% |
889
+19
| +2% | +$1.67K |
|
|
MOMO
289
PUT
Hello Group
MOMO
$879M
| $1.34M | 0.05% |
1,990
+777
| +64% | +$30.9K |
|
290
CALL
AutoZone
AZO
$48.4B
| $1.33M | 0.05% |
1,053
-99
| -9% | -$52.7K |
|
291
CALL
UnitedHealth
UNH
$391B
| $1.33M | 0.05% |
1,999
+713
| +55% | +$138K |
|
292
IPG Photonics
IPGP
$4.17B
| $1.33M | 0.05% |
7,187
+5,576
| +346% | +$926K |
|
293
Peabody Energy
BTU
$2.9B
| $1.32M | 0.05% |
45,584
+41,818
| +1,110% | +$1.18M |
|
294
CALL
Chipotle Mexican Grill
CMG
$41.3B
| $1.32M | 0.05% |
217,350
+2,900
| +1% | +$19.5K |
|
295
HF Sinclair
DINO
$16.5B
| $1.31M | 0.05% |
+36,460
| New | +$1.1M |
|
296
CALL
Western Digital
WDC
$192B
| $1.31M | 0.05% |
3,147
-347
| -10% | -$23K |
|
|
KANG
297
DELISTED
iKang Healthcare Group, Inc.
KANG
| $1.29M | 0.05% |
95,919
+26,665
| +39% | +$357K |
|
298
CALL
Costco
COST
$411B
| $1.29M | 0.05% |
2,780
-810
| -23% | -$127K |
|
299
PUT
Nike
NKE
$62.4B
| $1.28M | 0.05% |
4,530
-905
| -17% | -$50.8K |
|
|
PF
300
DELISTED
Pinnacle Foods, Inc.
PF
| $1.28M | 0.05% |
22,477
+4,786
| +27% | +$284K |
|
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.