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 | |
|---|---|---|---|---|---|---|
|
AAWW
2401
DELISTED
Atlas Air Worldwide Holdings, Inc.
AAWW
| $19K | ﹤0.01% |
460
-168
| -27% | -$7.84K |
|
|
MDVN
2402
PUT
DELISTED
MEDIVATION, INC.
MDVN
| $19K | ﹤0.01% |
68
-454
| -87% | -$26K |
|
2403
CALL
Aflac
AFL
$63.9B
| $18K | ﹤0.01% |
+84
| New | +$2.56K |
|
2404
Argan
AGX
$7.98B
| $18K | ﹤0.01% |
+515
| New | +$16.8K |
|
2405
Avnet
AVT
$7.33B
| $18K | ﹤0.01% |
405
-1,762
| -81% | -$77.8K |
|
2406
Century Aluminum
CENX
$4.57B
| $18K | ﹤0.01% |
+1,308
| New | +$26.3K |
|
2407
PUT
Carlyle Group
CG
$16.3B
| $18K | ﹤0.01% |
+208
| New | +$5.53K |
|
2408
PUT
Canadian Natural Resources
CNQ
$96.9B
| $18K | ﹤0.01% |
300
+174
| +138% | +$2.49K |
|
2409
PUT
Civeo
CVEO
$379M
| $18K | ﹤0.01% |
6
-12
| -67% | -$470 |
|
2410
PUT
Dominion Energy
D
$62.5B
| $18K | ﹤0.01% |
56
-114
| -67% | -$8.46K |
|
2411
CALL
Dover
DOV
$27.2B
| $18K | ﹤0.01% |
+73
| New | +$4.2K |
|
2412
PUT
DexCom
DXCM
$27.6B
| $18K | ﹤0.01% |
404
+248
| +159% | +$3.75K |
|
2413
CALL
General Dynamics
GD
$105B
| $18K | ﹤0.01% |
71
+2
| +3% | +$274 |
|
2414
CALL
Geron
GERN
$911M
| $18K | ﹤0.01% |
261
+192
| +278% | +$652 |
|
2415
CALL
Murphy USA
MUSA
$11.3B
| $18K | ﹤0.01% |
15
+7
| +88% | +$492 |
|
2416
PUT
Myriad Genetics
MYGN
$530M
| $18K | ﹤0.01% |
93
+35
| +60% | +$1.25K |
|
2417
PUT
Post Holdings
POST
$4.12B
| $18K | ﹤0.01% |
47
-16
| -25% | -$489 |
|
2418
Radware
RDWR
$1.24B
| $18K | ﹤0.01% |
+871
| New | +$18.5K |
|
2419
CALL
Stratasys
SSYS
$697M
| $18K | ﹤0.01% |
+144
| New | +$9.54K |
|
2420
PUT
Stellantis
STLA
$16.5B
| $18K | ﹤0.01% |
+692
| New | +$6.47K |
|
2421
CALL
Stryker
SYK
$127B
| $18K | ﹤0.01% |
32
-16
| -33% | -$1.49K |
|
2422
CALL
Synaptics
SYNA
$4.41B
| $18K | ﹤0.01% |
34
-65
| -66% | -$4.91K |
|
2423
CALL
T. Rowe Price
TROW
$25B
| $18K | ﹤0.01% |
98
+82
| +513% | +$6.75K |
|
2424
PUT
Titan International
TWI
$516M
| $18K | ﹤0.01% |
53
+40
| +308% | +$389 |
|
2425
CALL
Texas Roadhouse
TXRH
$12.7B
| $18K | ﹤0.01% |
+163
| New | +$5.79K |
|
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.