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 | |
|---|---|---|---|---|---|---|
3501
PUT
NOV
NOV
$7.18B
| $221K | ﹤0.01% |
83
-78
| -48% | -$2.21K |
|
|
SIX
3502
DELISTED
Six Flags Entertainment Corp.
SIX
| $221K | ﹤0.01% |
4,487
+2,541
| +131% | +$144K |
|
|
EMWP
3503
DELISTED
Eros Media World PLC
EMWP
| $221K | ﹤0.01% |
1,211
+1,057
| +686% | +$203K |
|
3504
CALL
Belden
BDC
$4.04B
| $220K | ﹤0.01% |
41
+35
| +583% | +$1.92K |
|
3505
VanEck Brazil Small-Cap ETF
BRF
$21.8M
| $220K | ﹤0.01% |
10,324
+4,695
| +83% | +$104K |
|
3506
CALL
Casella Waste Systems
CWST
$5.71B
| $220K | ﹤0.01% |
62
+27
| +77% | +$881 |
|
3507
PUT
The GEO Group
GEO
$4.13B
| $220K | ﹤0.01% |
115
+107
| +1,338% | +$2.3K |
|
|
HAPN
3508
PUT
Happen Inc
HAPN
$2.2B
| $220K | ﹤0.01% |
142
+125
| +735% | +$1.93K |
|
3509
OneSpan
OSPN
$575M
| $220K | ﹤0.01% |
+11,469
| New | +$195K |
|
|
CHUY
3510
PUT
DELISTED
Chuy's Holdings, Inc. Common Stock
CHUY
| $220K | ﹤0.01% |
97
+96
| +9,600% | +$2.1K |
|
3511
CALL
Alliance Resource Partners
ARLP
$3.35B
| $219K | ﹤0.01% |
108
+93
| +620% | +$1.8K |
|
3512
PUT
MacroGenics
MGNX
$243M
| $219K | ﹤0.01% |
+122
| New | +$2.11K |
|
3513
PUT
Magnachip Semiconductor
MX
$118M
| $219K | ﹤0.01% |
297
-4
| -1% | -$28 |
|
3514
PUT
Sonos
SONO
$1.91B
| $219K | ﹤0.01% |
213
-14
| -6% | -$152 |
|
|
MDSO
3515
CALL
DELISTED
Medidata Solutions, Inc.
MDSO
| $219K | ﹤0.01% |
+30
| New | +$2.17K |
|
|
LITS
3516
CALL
Lite Strategy Inc
LITS
$33.6M
| $218K | ﹤0.01% |
36
-2
| -5% | -$115 |
|
3517
MetLife
MET
$62.6B
| $218K | ﹤0.01% |
5,135
-45,759
| -90% | -$2.02M |
|
3518
PUT
PDF Solutions
PDFS
$1.87B
| $218K | ﹤0.01% |
177
-272
| -61% | -$3.01K |
|
3519
Vicor
VICR
$8.63B
| $218K | ﹤0.01% |
7,051
-1,568
| -18% | -$57.8K |
|
3520
PUT
Anika Therapeutics
ANIK
$203M
| $217K | ﹤0.01% |
72
+35
| +95% | +$1.2K |
|
3521
PUT
Natural Health Trends
NHTC
$15.9M
| $217K | ﹤0.01% |
168
+41
| +32% | +$612 |
|
3522
PUT
Oceaneering
OII
$4.78B
| $217K | ﹤0.01% |
+138
| New | +$2.14K |
|
3523
PUT
Skywest
SKYW
$4.51B
| $217K | ﹤0.01% |
+40
| New | +$2.05K |
|
3524
PUT
Travere Therapeutics
TVTX
$5.18B
| $217K | ﹤0.01% |
96
-116
| -55% | -$2.56K |
|
3525
Globant
GLOB
$1.53B
| $216K | ﹤0.01% |
+3,028
| New | +$204K |
|
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.