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 | |
|---|---|---|---|---|---|---|
2351
PUT
Aflac
AFL
$63.9B
| $670K | ﹤0.01% |
134
-324
| -71% | -$15.6K |
|
2352
RLJ Lodging Trust
RLJ
$1.87B
| $669K | ﹤0.01% |
38,123
-19,586
| -34% | -$357K |
|
2353
CALL
Wingstop
WING
$3.68B
| $669K | ﹤0.01% |
88
+81
| +1,157% | +$5.52K |
|
|
RDUS
2354
CALL
DELISTED
Radius Health, Inc.
RDUS
| $669K | ﹤0.01% |
336
-570
| -63% | -$10.4K |
|
|
AMED
2355
DELISTED
Amedisys
AMED
| $668K | ﹤0.01% |
+5,423
| New | +$681K |
|
2356
PUT
Rapid7
RPD
$634M
| $668K | ﹤0.01% |
132
+114
| +633% | +$4.88K |
|
2357
CALL
Carlyle Group
CG
$16.3B
| $667K | ﹤0.01% |
365
+330
| +943% | +$5.99K |
|
2358
PUT
Inogen
INGN
$167M
| $667K | ﹤0.01% |
70
+46
| +192% | +$5.74K |
|
2359
CALL
Wendy's
WEN
$1.33B
| $667K | ﹤0.01% |
373
+271
| +266% | +$4.61K |
|
|
AQUA
2360
PUT
DELISTED
Evoqua Water Technologies Corp. Common Stock
AQUA
| $667K | ﹤0.01% |
531
+520
| +4,727% | +$6.19K |
|
2361
Domo
DOMO
$166M
| $666K | ﹤0.01% |
16,528
+10,664
| +182% | +$327K |
|
|
RDFN
2362
CALL
DELISTED
Redfin
RDFN
| $666K | ﹤0.01% |
329
+226
| +219% | +$4.12K |
|
2363
PUT
Tanger
SKT
$4.82B
| $665K | ﹤0.01% |
317
-125
| -28% | -$2.69K |
|
2364
Bunge Global
BG
$23.6B
| $664K | ﹤0.01% |
12,530
-31,708
| -72% | -$1.68M |
|
2365
CALL
Equifax
EFX
$20.3B
| $663K | ﹤0.01% |
56
-63
| -53% | -$6.72K |
|
2366
CALL
Invesco CurrencyShares Japanese Yen Trust
FXY
$423M
| $663K | ﹤0.01% |
77
-316
| -80% | -$27.4K |
|
2367
CALL
Medifast
MED
$108M
| $663K | ﹤0.01% |
52
+41
| +373% | +$5.2K |
|
2368
PUT
Keurig Dr Pepper
KDP
$40.4B
| $662K | ﹤0.01% |
237
-14
| -6% | -$378 |
|
2369
Yext
YEXT
$501M
| $662K | ﹤0.01% |
+30,298
| New | +$550K |
|
|
SHLX
2370
CALL
DELISTED
Shell Midstream Partners, L.P.
SHLX
| $662K | ﹤0.01% |
324
+317
| +4,529% | +$6.08K |
|
2371
PUT
Semtech
SMTC
$11.7B
| $661K | ﹤0.01% |
130
+129
| +12,900% | +$6.66K |
|
2372
PUT
DMC Global
BOOM
$121M
| $660K | ﹤0.01% |
133
-18
| -12% | -$730 |
|
|
CIVI
2373
PUT
DELISTED
Civitas Resources
CIVI
| $660K | ﹤0.01% |
291
+276
| +1,840% | +$6.36K |
|
|
SKX
2374
DELISTED
Skechers
SKX
| $659K | ﹤0.01% |
+19,620
| New | +$586K |
|
|
WPX
2375
DELISTED
WPX Energy, Inc.
WPX
| $659K | ﹤0.01% |
50,282
+46,416
| +1,201% | +$583K |
|
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.