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 |
Invesco QQQ Trust
QQQ
|
+$86.9M |
| 2 |
Walt Disney
DIS
|
+$25.5M |
| 3 |
Baidu
BIDU
|
+$12.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$12.3M |
| 5 |
RHT
Red Hat Inc
RHT
|
+$11.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$60.3M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$33.9M |
| 4 |
Apple
AAPL
|
+$21.1M |
| 5 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$18.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.58% |
| 2 | Technology | 0.42% |
| 3 | Healthcare | 0.34% |
| 4 | Consumer Discretionary | 0.29% |
| 5 | Industrials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1526
CALL
OSI Systems
OSIS
$3.57B
| $1.7M | ﹤0.01% |
194
-72
| -27% | -$6.03K |
|
1527
Royal Caribbean
RCL
$78.7B
| $1.7M | ﹤0.01% |
+14,831
| New | +$1.69M |
|
1528
Sea Limited
SE
$61.2B
| $1.7M | ﹤0.01% |
72,181
+52,602
| +269% | +$922K |
|
1529
PUT
Targa Resources
TRGP
$60.4B
| $1.69M | ﹤0.01% |
406
+393
| +3,023% | +$16.5K |
|
1530
Clean Harbors
CLH
$16.1B
| $1.68M | ﹤0.01% |
23,541
+22,258
| +1,735% | +$1.38M |
|
1531
CALL
T. Rowe Price
TROW
$25B
| $1.68M | ﹤0.01% |
168
-223
| -57% | -$21.5K |
|
1532
Western Digital
WDC
$179B
| $1.68M | ﹤0.01% |
46,264
-15,062
| -25% | -$516K |
|
|
CLVS
1533
PUT
DELISTED
Clovis Oncology, Inc.
CLVS
| $1.68M | ﹤0.01% |
676
-250
| -27% | -$6.27K |
|
1534
PUT
Cheesecake Factory
CAKE
$4.21B
| $1.67M | ﹤0.01% |
342
+273
| +396% | +$12.6K |
|
|
DATA
1535
DELISTED
Tableau Software, Inc.
DATA
| $1.67M | ﹤0.01% |
+13,126
| New | +$1.66M |
|
1536
PUT
GameStop
GME
$9.5B
| $1.67M | ﹤0.01% |
6,568
-452
| -6% | -$1.4K |
|
1537
Automatic Data Processing
ADP
$100B
| $1.67M | ﹤0.01% |
+10,436
| New | +$1.52M |
|
|
DAY
1538
PUT
DELISTED
Dayforce
DAY
| $1.67M | ﹤0.01% |
325
+310
| +2,067% | +$13.7K |
|
1539
CALL
United Therapeutics
UTHR
$26.3B
| $1.67M | ﹤0.01% |
142
+140
| +7,000% | +$16.3K |
|
|
PYX
1540
PUT
DELISTED
Pyxus International, Inc.
PYX
| $1.66M | ﹤0.01% |
695
+583
| +521% | +$12.2K |
|
1541
PUT
Broadridge
BR
$17.2B
| $1.66M | ﹤0.01% |
160
+124
| +344% | +$12.4K |
|
1542
PUT
Ambarella
AMBA
$2.99B
| $1.66M | ﹤0.01% |
384
+35
| +10% | +$1.39K |
|
1543
Direxion Daily Energy Bull 2X ETF
ERX
$249M
| $1.66M | ﹤0.01% |
7,295
+4,554
| +166% | +$954K |
|
1544
CALL
Sysco
SYY
$39.7B
| $1.66M | ﹤0.01% |
248
-437
| -64% | -$28.4K |
|
1545
PUT
First Solar
FSLR
$21.8B
| $1.65M | ﹤0.01% |
313
-240
| -43% | -$12.1K |
|
1546
CALL
British American Tobacco
BTI
$132B
| $1.65M | ﹤0.01% |
396
+229
| +137% | +$8.33K |
|
|
1547
PUT
T. Rowe Price
TROW
$25B
| $1.65M | ﹤0.01% |
165
-26
| -14% | -$2.51K |
|
1548
Invesco DB US Dollar Index Bullish Fund
UUP
$434M
| $1.65M | ﹤0.01% |
63,438
+57,922
| +1,050% | +$1.49M |
|
1549
CALL
Old National Bancorp
ONB
$10.1B
| $1.65M | ﹤0.01% |
+1,005
| New | +$16.8K |
|
1550
CALL
Regency Centers
REG
$15B
| $1.65M | ﹤0.01% |
244
+222
| +1,009% | +$14.2K |
|
Similar funds
Simplex Trading's Q1 2019 Portfolio in Review
As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
- Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
- Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
- Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
- Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
- Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.
Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.