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 | |
|---|---|---|---|---|---|---|
|
CIM
4376
CALL
Chimera Investment
CIM
$1.06B
| $95K | ﹤0.01% |
17
-74
| -81% | -$4.16K |
|
4377
PUT
Flowers Foods
FLO
$1.58B
| $95K | ﹤0.01% |
45
+37
| +463% | +$742 |
|
4378
Freshpet
FRPT
$3.04B
| $95K | ﹤0.01% |
+2,267
| New | +$87.3K |
|
4379
CALL
Lexicon Pharmaceuticals
LXRX
$1.03B
| $95K | ﹤0.01% |
172
+95
| +123% | +$577 |
|
4380
PUT
Impinj
PI
$4.24B
| $95K | ﹤0.01% |
57
-3
| -5% | -$50 |
|
4381
PUT
Scholastic
SCHL
$774M
| $95K | ﹤0.01% |
24
+23
| +2,300% | +$949 |
|
4382
CALL
Alaunos Therapeutics
TCRT
$4.64M
| $95K | ﹤0.01% |
2
-11
| -85% | -$4.6K |
|
4383
PUT
Tilly's
TLYS
$114M
| $95K | ﹤0.01% |
86
+8
| +10% | +$95 |
|
4384
Travelers Companies
TRV
$81.1B
| $95K | ﹤0.01% |
695
-21,735
| -97% | -$2.78M |
|
|
CSCI
4385
CALL
DELISTED
COSCIENS Biopharma Inc. Common Stock
CSCI
| $95K | ﹤0.01% |
+2
| New | +$777 |
|
|
MXIM
4386
PUT
DELISTED
Maxim Integrated Products
MXIM
| $95K | ﹤0.01% |
18
-258
| -93% | -$13.9K |
|
|
AMAG
4387
DELISTED
AMAG Pharmaceuticals
AMAG
| $95K | ﹤0.01% |
+7,400
| New | +$110K |
|
4388
PUT
Allison Transmission
ALSN
$9.51B
| $94K | ﹤0.01% |
21
+12
| +133% | +$570 |
|
4389
CALL
Axogen
AXGN
$2.2B
| $94K | ﹤0.01% |
45
-53
| -54% | -$968 |
|
4390
F5
FFIV
$22B
| $94K | ﹤0.01% |
+600
| New | +$96.6K |
|
4391
FMC
FMC
$1.25B
| $94K | ﹤0.01% |
1,225
-715
| -37% | -$52.5K |
|
4392
PUT
MannKind Corp
MNKD
$1.19B
| $94K | ﹤0.01% |
478
-397
| -45% | -$629 |
|
|
NOAH
4393
Noah Holdings
NOAH
$590M
| $94K | ﹤0.01% |
1,946
+1,492
| +329% | +$72.4K |
|
4394
NETGEAR
NTGR
$612M
| $94K | ﹤0.01% |
2,852
+2,485
| +677% | +$90.2K |
|
|
PCH
4395
CALL
DELISTED
PotlatchDeltic
PCH
| $94K | ﹤0.01% |
25
+16
| +178% | +$571 |
|
4396
PUT
SandRidge Energy
SD
$503M
| $94K | ﹤0.01% |
118
-600
| -84% | -$4.91K |
|
4397
CALL
SM Energy
SM
$7.6B
| $94K | ﹤0.01% |
54
-66
| -55% | -$1.17K |
|
4398
Schneider National
SNDR
$6.17B
| $94K | ﹤0.01% |
4,509
+3,016
| +202% | +$64.5K |
|
4399
CALL
Tactile Systems Technology
TCMD
$618M
| $94K | ﹤0.01% |
18
-13
| -42% | -$840 |
|
|
CDMO
4400
DELISTED
Avid Bioservices, Inc. Common Stock
CDMO
| $94K | ﹤0.01% |
22,244
+6,064
| +37% | +$24.7K |
|
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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.