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
|
+$148M |
| 2 |
Invesco QQQ Trust
QQQ
|
+$67.3M |
| 3 |
Meta Platforms (Facebook)
META
|
+$63.2M |
| 4 |
Goldman Sachs
GS
|
+$23.9M |
| 5 |
Citigroup
C
|
+$23.1M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Berkshire Hathaway Class B
BRK.B
|
+$47.5M |
| 2 |
Apple
AAPL
|
+$46M |
| 3 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$44.5M |
| 4 |
Micron Technology
MU
|
+$29.1M |
| 5 |
Adobe
ADBE
|
+$22.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Consumer Discretionary | 1.13% |
| 2 | Communication Services | 0.89% |
| 3 | Technology | 0.68% |
| 4 | Industrials | 0.51% |
| 5 | Healthcare | 0.44% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
CRZO
2526
CALL
DELISTED
Carrizo Oil & Gas Inc
CRZO
| $554K | ﹤0.01% |
220
-91
| -29% | -$2.35K |
|
|
ZEN
2527
PUT
DELISTED
ZENDESK INC
ZEN
| $553K | ﹤0.01% |
78
-60
| -43% | -$3.83K |
|
2528
WisdomTree India Earnings Fund ETF
EPI
$2.02B
| $552K | ﹤0.01% |
22,899
+3,716
| +19% | +$96.7K |
|
2529
CALL
Alarm.com
ALRM
$2.56B
| $551K | ﹤0.01% |
96
-21
| -18% | -$1.06K |
|
2530
PUT
BorgWarner
BWA
$13.2B
| $551K | ﹤0.01% |
147
+74
| +101% | +$2.91K |
|
|
ONC
2531
PUT
BeOne Medicines Ltd
ONC
$33.8B
| $551K | ﹤0.01% |
32
-15
| -32% | -$2.52K |
|
2532
PUT
Extreme Networks
EXTR
$3.86B
| $550K | ﹤0.01% |
1,005
+168
| +20% | +$1.19K |
|
2533
PUT
Chefs' Warehouse
CHEF
$3.87B
| $548K | ﹤0.01% |
+151
| New | +$4.66K |
|
|
TWOU
2534
CALL
DELISTED
2U Inc
TWOU
| $548K | ﹤0.01% |
2
| – | – |
|
2535
MaxLinear
MXL
$6.49B
| $547K | ﹤0.01% |
27,533
+24,978
| +978% | +$455K |
|
|
ULTI
2536
CALL
DELISTED
Ultimate Software Group Inc
ULTI
| $547K | ﹤0.01% |
17
+12
| +240% | +$3.55K |
|
2537
GameStop
GME
$9.5B
| $546K | ﹤0.01% |
+143,140
| New | +$549K |
|
|
THS
2538
DELISTED
Treehouse Foods
THS
| $546K | ﹤0.01% |
11,421
+10,776
| +1,671% | +$554K |
|
|
GTT
2539
CALL
DELISTED
GTT Communications, Inc.
GTT
| $546K | ﹤0.01% |
126
+73
| +138% | +$3.12K |
|
2540
Church & Dwight Co
CHD
$23.1B
| $545K | ﹤0.01% |
+9,181
| New | +$520K |
|
2541
PUT
Sturm, Ruger & Co
RGR
$610M
| $545K | ﹤0.01% |
79
-63
| -44% | -$3.81K |
|
2542
PUT
Brink's
BCO
$5.02B
| $544K | ﹤0.01% |
78
-99
| -56% | -$7.64K |
|
2543
CALL
Caesars Entertainment
CZR
$6.1B
| $544K | ﹤0.01% |
112
+107
| +2,140% | +$4.86K |
|
2544
PUT
Hewlett Packard
HPE
$63.2B
| $544K | ﹤0.01% |
352
-611
| -63% | -$9.79K |
|
|
SNV
2545
PUT
DELISTED
Synovus
SNV
| $544K | ﹤0.01% |
119
+118
| +11,800% | +$5.94K |
|
|
ASXC
2546
PUT
DELISTED
Asensus Surgical, Inc.
ASXC
| $544K | ﹤0.01% |
72
+2
| +3% | +$135 |
|
|
CJ
2547
CALL
DELISTED
C&J Energy Services, Inc.
CJ
| $544K | ﹤0.01% |
+262
| New | +$5.87K |
|
2548
CALL
Qualys
QLYS
$4.84B
| $543K | ﹤0.01% |
61
-219
| -78% | -$19.7K |
|
2549
CALL
Natural Health Trends
NHTC
$15.4M
| $542K | ﹤0.01% |
233
+228
| +4,560% | +$5.59K |
|
|
CTLT
2550
CALL
DELISTED
CATALENT, INC.
CTLT
| $542K | ﹤0.01% |
119
+86
| +261% | +$3.63K |
|
Similar funds
Simplex Trading's Q3 2018 Portfolio in Review
As of Q3 2018, Simplex Trading held 8,699 positions worth $31.1B, up 22% from $25.5B the previous quarter. Its ten largest holdings account for 34% of the portfolio.
Simplex Trading's Q3 2018 filing shows 1,336 new, 3,066 increased, 2,755 reduced and 1,315 closed positions. Its largest new stake was Invesco QQQ Trust: 371,806 shares worth $69.1M. The largest sale was Berkshire Hathaway Class B, an estimated $47.5M.
By sector, the portfolio is most concentrated in Consumer Discretionary at 1.1% of assets, up from 0.92% a quarter earlier, followed by Communication Services and Technology.
- Simplex Trading's largest Q3 2018 buy was Invesco QQQ Trust: 371,806 shares worth $69.1M.
- Simplex Trading added most to Amazon in Q3 2018, an estimated $148M increase.
- Simplex Trading's biggest Q3 2018 reduction was Apple, cutting an estimated $46M.
- Simplex Trading fully exited Berkshire Hathaway Class B in Q3 2018, selling an estimated $47.5M.
- Simplex Trading's ten largest holdings make up 34% of its $31.1B portfolio in Q3 2018.
- Simplex Trading opened 1,336 new positions and closed 1,315 in Q3 2018.
- Simplex Trading's portfolio value rose 22% quarter-over-quarter to $31.1B.
Based on Simplex Trading's 13F filing for Q3 2018, filed 23 Oct 2018.