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 |
Alphabet (Google) Class C
GOOG
|
+$40.1M |
| 2 |
Berkshire Hathaway Class B
BRK.B
|
+$12.5M |
| 3 |
Alibaba
BABA
|
+$10.5M |
| 4 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$9.89M |
| 5 |
Intel
INTC
|
+$9.83M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$35.7M |
| 2 |
Gilead Sciences
GILD
|
+$32.3M |
| 3 |
Amazon
AMZN
|
+$29M |
| 4 |
Booking.com
BKNG
|
+$28.4M |
| 5 |
Baidu
BIDU
|
+$13.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 7.76% |
| 2 | Consumer Discretionary | 7.62% |
| 3 | Healthcare | 7.24% |
| 4 | Technology | 6.95% |
| 5 | Financials | 4.83% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3326
CALL
Cimpress
CMPR
$2.41B
| $6K | ﹤0.01% |
+15
| New | +$1.2K |
|
3327
CALL
CONMED
CNMD
$1.31B
| $6K | ﹤0.01% |
11
| – | – |
|
3328
PUT
Cohu
COHU
$2.26B
| $6K | ﹤0.01% |
30
-4
| -12% | -$45 |
|
3329
Curis
CRIS
$9.14M
| $6K | ﹤0.01% |
+1
| New | +$4.83K |
|
3330
CALL
Curtiss-Wright
CW
$27.5B
| $6K | ﹤0.01% |
+11
| New | +$769 |
|
3331
WisdomTree Emerging Markets SmallCap Dividend Fund
DGS
$1.71B
| $6K | ﹤0.01% |
+147
| New | +$6.45K |
|
3332
PUT
DNOW Inc
DNOW
$2.59B
| $6K | ﹤0.01% |
27
+14
| +108% | +$326 |
|
3333
PUT
Domino's
DPZ
$11.4B
| $6K | ﹤0.01% |
19
-89
| -82% | -$8.95K |
|
3334
CALL
Entegris
ENTG
$19.2B
| $6K | ﹤0.01% |
50
| – | – |
|
3335
CALL
Edwards Lifesciences
EW
$47.8B
| $6K | ﹤0.01% |
204
-354
| -63% | -$7.94K |
|
3336
CALL
Exelon
EXC
$48.2B
| $6K | ﹤0.01% |
105
+21
| +25% | +$520 |
|
3337
CALL
Five Below
FIVE
$11.5B
| $6K | ﹤0.01% |
57
+33
| +138% | +$1.1K |
|
3338
CALL
Fossil Group
FOSL
$249M
| $6K | ﹤0.01% |
71
+38
| +115% | +$3.5K |
|
3339
CALL
TechnipFMC
FTI
$29.9B
| $6K | ﹤0.01% |
153
+115
| +303% | +$3.37K |
|
3340
PUT
G-III Apparel Group
GIII
$1.52B
| $6K | ﹤0.01% |
48
+6
| +14% | +$309 |
|
3341
CALL
Globe Life
GL
$13.5B
| $6K | ﹤0.01% |
+49
| New | +$2.61K |
|
3342
CALL
Corning
GLW
$123B
| $6K | ﹤0.01% |
169
+116
| +219% | +$2.76K |
|
|
B
3343
CALL
Barrick Mining
B
$62.6B
| $6K | ﹤0.01% |
+30
| New | +$355 |
|
3344
CALL
Green Plains
GPRE
$1.15B
| $6K | ﹤0.01% |
63
+54
| +600% | +$1.35K |
|
|
GTLS
3345
PUT
DELISTED
Chart Industries
GTLS
| $6K | ﹤0.01% |
3
-20
| -87% | -$643 |
|
|
HI
3346
DELISTED
Hillenbrand
HI
| $6K | ﹤0.01% |
205
+149
| +266% | +$4.68K |
|
3347
Hercules Capital
HTGC
$2.95B
| $6K | ﹤0.01% |
482
-575
| -54% | -$8.43K |
|
3348
PUT
Idexx Laboratories
IDXX
$43.9B
| $6K | ﹤0.01% |
+58
| New | +$4.51K |
|
3349
IMAX
IMAX
$2.47B
| $6K | ﹤0.01% |
+198
| New | +$6.58K |
|
3350
CALL
Imperial Oil
IMO
$60.8B
| $6K | ﹤0.01% |
62
+43
| +226% | +$1.68K |
|
Similar funds
Simplex Trading's Q1 2015 Portfolio in Review
As of Q1 2015, Simplex Trading held 6,670 positions worth $860M, up 4.2% from $826M the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q1 2015 filing shows 1,973 new, 1,386 increased, 1,513 reduced and 1,643 closed positions. Its largest new stake was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M. The largest sale was Apple, an estimated $35.7M.
By sector, the portfolio is most concentrated in Communication Services at 7.8% of assets, up from 4.8% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q1 2015 buy was Alphabet (Google) Class C: 1,497,580 shares worth $41.4M.
- Simplex Trading added most to Alibaba in Q1 2015, an estimated $10.5M increase.
- Simplex Trading's biggest Q1 2015 reduction was Apple, cutting an estimated $35.7M.
- Simplex Trading fully exited Amazon in Q1 2015, selling an estimated $29M.
- Simplex Trading's ten largest holdings make up 15% of its $860M portfolio in Q1 2015.
- Simplex Trading opened 1,973 new positions and closed 1,643 in Q1 2015.
- Simplex Trading's portfolio value rose 4.2% quarter-over-quarter to $860M.
Based on Simplex Trading's 13F filing for Q1 2015, filed 21 Apr 2015.