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 | |
|---|---|---|---|---|---|---|
351
PUT
Qualcomm
QCOM
$186B
| $459K | 0.05% |
1,366
+55
| +4% | +$3.88K |
|
352
Ambarella
AMBA
$3B
| $457K | 0.05% |
+6,040
| New | +$367K |
|
|
FOLD
353
DELISTED
Amicus Therapeutics
FOLD
| $456K | 0.05% |
42,001
+28,561
| +213% | +$252K |
|
|
POM
354
DELISTED
PEPCO HOLDINGS, INC.
POM
| $456K | 0.05% |
+17,005
| New | +$461K |
|
355
Northern Trust
NTRS
$33B
| $455K | 0.05% |
6,545
+4,788
| +273% | +$327K |
|
356
AutoZone
AZO
$48.5B
| $453K | 0.05% |
+665
| New | +$418K |
|
357
CALL
Herbalife
HLF
$1.26B
| $453K | 0.05% |
3,472
-448
| -11% | -$7.65K |
|
|
MDVN
358
CALL
DELISTED
MEDIVATION, INC.
MDVN
| $452K | 0.05% |
222
-184
| -45% | -$10.5K |
|
|
359
Herbalife
HLF
$1.26B
| $450K | 0.05% |
21,072
+20,772
| +6,924% | +$355K |
|
360
iShares iBoxx $ Investment Grade Corporate Bond ETF
LQD
$34.8B
| $450K | 0.05% |
+3,700
| New | +$449K |
|
361
Restaurant Brands International
QSR
$25.4B
| $446K | 0.05% |
+11,621
| New | +$463K |
|
362
Toyota
TM
$213B
| $445K | 0.05% |
+3,185
| New | +$425K |
|
363
CALL
Chipotle Mexican Grill
CMG
$40.9B
| $444K | 0.05% |
18,550
-24,000
| -56% | -$328K |
|
364
CALL
EOG Resources
EOG
$77.3B
| $439K | 0.05% |
930
-79
| -8% | -$7.14K |
|
|
BHI
365
CALL
DELISTED
Baker Hughes
BHI
| $439K | 0.05% |
+549
| New | +$33.1K |
|
|
BITA
366
DELISTED
Bitauto Holdings Limited
BITA
| $435K | 0.05% |
8,550
+7,640
| +840% | +$467K |
|
|
LO
367
CALL
DELISTED
LORILLARD INC COM STK
LO
| $435K | 0.05% |
454
+142
| +46% | +$9.45K |
|
368
CF Industries
CF
$19.5B
| $433K | 0.05% |
7,640
-30,005
| -80% | -$1.79M |
|
369
Best Buy
BBY
$18.3B
| $429K | 0.05% |
11,377
+9,902
| +671% | +$379K |
|
|
DD
370
PUT
DELISTED
Du Pont De Nemours E I
DD
| $429K | 0.05% |
1,052
+739
| +236% | +$52.7K |
|
371
CALL
Citigroup
C
$223B
| $428K | 0.05% |
1,022
-639
| -38% | -$32.5K |
|
372
Middleby
MIDD
$5.92B
| $428K | 0.05% |
+4,177
| New | +$424K |
|
|
MCF
373
DELISTED
Contango Oil & Gas Co.
MCF
| $427K | 0.05% |
19,419
-1,493
| -7% | -$38.4K |
|
|
BHI
374
DELISTED
Baker Hughes
BHI
| $426K | 0.05% |
6,704
-5,953
| -47% | -$359K |
|
375
CALL
Valero Energy
VLO
$93B
| $425K | 0.05% |
625
-23
| -4% | -$1.28K |
|
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.