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 | |
|---|---|---|---|---|---|---|
|
FDC
2476
DELISTED
First Data Corporation
FDC
| $601K | ﹤0.01% |
22,905
-49,339
| -68% | -$1.17M |
|
2477
OFG Bancorp
OFG
$2.21B
| $600K | ﹤0.01% |
+30,357
| New | +$588K |
|
2478
PUT
Alexandria Real Estate Equities
ARE
$8.88B
| $598K | ﹤0.01% |
42
+40
| +2,000% | +$5.27K |
|
2479
CALL
Novartis
NVS
$295B
| $598K | ﹤0.01% |
580
+295
| +104% | +$23.7K |
|
2480
CALL
Viper Energy
VNOM
$8.81B
| $596K | ﹤0.01% |
180
-341
| -65% | -$10.9K |
|
|
PTLA
2481
CALL
DELISTED
Portola Pharmaceuticals, Inc.
PTLA
| $596K | ﹤0.01% |
172
-769
| -82% | -$22.2K |
|
2482
PUT
Unilever
UL
$131B
| $594K | ﹤0.01% |
92
-23
| -20% | -$1.4K |
|
2483
Vail Resorts
MTN
$5.19B
| $593K | ﹤0.01% |
+2,729
| New | +$558K |
|
|
GWR
2484
PUT
DELISTED
Genesee & Wyoming Inc.
GWR
| $592K | ﹤0.01% |
68
-7
| -9% | -$568 |
|
2485
Indaptus Therapeutics
INDP
$348M
| $591K | ﹤0.01% |
36
+16
| +80% | +$280K |
|
2486
CALL
Teck Resources
TECK
$29.5B
| $591K | ﹤0.01% |
255
-275
| -52% | -$6.2K |
|
2487
Wolfspeed
WOLF
$1.2B
| $591K | ﹤0.01% |
10,329
-11,556
| -53% | -$593K |
|
|
PYX
2488
DELISTED
Pyxus International, Inc.
PYX
| $591K | ﹤0.01% |
24,746
+22,519
| +1,011% | +$470K |
|
2489
PUT
Sensata Technologies
ST
$6.65B
| $589K | ﹤0.01% |
131
+100
| +323% | +$4.74K |
|
2490
PUT
Trupanion
TRUP
$1.05B
| $589K | ﹤0.01% |
180
-1
| -0.6% | -$28 |
|
|
AERI
2491
PUT
DELISTED
Aerie Pharmaceuticals
AERI
| $589K | ﹤0.01% |
124
+84
| +210% | +$3.7K |
|
2492
PUT
National Beverage
FIZZ
$2.87B
| $588K | ﹤0.01% |
204
-2
| -1% | -$71 |
|
2493
CALL
Transocean
RIG
$5.92B
| $588K | ﹤0.01% |
676
-158
| -19% | -$1.35K |
|
2494
CALL
STMicroelectronics
STM
$46B
| $588K | ﹤0.01% |
396
-314
| -44% | -$4.87K |
|
2495
PUT
Extreme Networks
EXTR
$3.86B
| $587K | ﹤0.01% |
785
-1,575
| -67% | -$11.5K |
|
2496
PUT
Avnet
AVT
$7.33B
| $585K | ﹤0.01% |
135
+80
| +145% | +$3.38K |
|
2497
CALL
Black Stone Minerals
BSM
$3.11B
| $585K | ﹤0.01% |
332
+284
| +592% | +$4.88K |
|
2498
NRG Energy
NRG
$29.8B
| $585K | ﹤0.01% |
+13,794
| New | +$571K |
|
2499
Solid Biosciences
SLDB
$771M
| $585K | ﹤0.01% |
4,242
+3,676
| +649% | +$921K |
|
2500
CALL
Sunoco
SUN
$14.2B
| $585K | ﹤0.01% |
188
-136
| -42% | -$4.05K |
|
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.