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 | |
|---|---|---|---|---|---|---|
|
SRCL
3251
PUT
DELISTED
Stericycle Inc
SRCL
| $282K | ﹤0.01% |
52
+46
| +767% | +$2.08K |
|
3252
PUT
Apogee Enterprises
APOG
$855M
| $281K | ﹤0.01% |
75
+62
| +477% | +$2.15K |
|
3253
CALL
Guidewire Software
GWRE
$12.4B
| $281K | ﹤0.01% |
29
-185
| -86% | -$16.5K |
|
3254
CALL
Hormel Foods
HRL
$14.3B
| $281K | ﹤0.01% |
63
-118
| -65% | -$5.05K |
|
3255
PUT
Southern Copper
SCCO
$141B
| $281K | ﹤0.01% |
77
-11
| -13% | -$351 |
|
|
PVG
3256
DELISTED
PRETIUM RESOURCES INC.
PVG
| $281K | ﹤0.01% |
+32,917
| New | +$262K |
|
|
CBIO
3257
Crescent Biopharma
CBIO
$626M
| $280K | ﹤0.01% |
225
+181
| +411% | +$207K |
|
3258
PagSeguro Digital
PAGS
$2.62B
| $280K | ﹤0.01% |
9,399
-26,257
| -74% | -$655K |
|
3259
Brown-Forman Class B
BF.B
$12.6B
| $279K | ﹤0.01% |
+5,296
| New | +$257K |
|
|
EMBJ
3260
Embraer S.A. ADS
EMBJ
$12.1B
| $279K | ﹤0.01% |
14,714
+4,268
| +41% | +$88.8K |
|
3261
PUT
MakeMyTrip
MMYT
$4.97B
| $278K | ﹤0.01% |
101
+26
| +35% | +$709 |
|
|
BPL
3262
PUT
DELISTED
Buckeye Partners, L.P.
BPL
| $278K | ﹤0.01% |
82
-553
| -87% | -$17.9K |
|
3263
AerCap
AER
$23.9B
| $277K | ﹤0.01% |
5,956
-6,952
| -54% | -$314K |
|
|
ASXC
3264
PUT
DELISTED
Asensus Surgical, Inc.
ASXC
| $277K | ﹤0.01% |
90
+1
| +1% | +$34 |
|
|
AMRS
3265
PUT
DELISTED
Amyris Inc.
AMRS
| $277K | ﹤0.01% |
1,329
+849
| +177% | +$3.35K |
|
3266
CALL
Braskem
BAK
$972M
| $276K | ﹤0.01% |
107
+76
| +245% | +$2.1K |
|
3267
CALL
SK Telecom
SKM
$13.5B
| $276K | ﹤0.01% |
69
+67
| +3,350% | +$2.83K |
|
3268
CALL
Gerdau
GGB
$9.48B
| $275K | ﹤0.01% |
896
+887
| +9,856% | +$2.88K |
|
3269
PUT
Masco
MAS
$16.4B
| $275K | ﹤0.01% |
70
-4
| -5% | -$143 |
|
|
ITCI
3270
PUT
DELISTED
Intra-Cellular Therapies Inc.
ITCI
| $275K | ﹤0.01% |
226
+61
| +37% | +$779 |
|
|
PLAN
3271
PUT
DELISTED
Anaplan, Inc.
PLAN
| $275K | ﹤0.01% |
70
+66
| +1,650% | +$2.22K |
|
|
ZGNX
3272
CALL
DELISTED
Zogenix, Inc.
ZGNX
| $275K | ﹤0.01% |
50
-307
| -86% | -$14.6K |
|
3273
CALL
Ingevity
NGVT
$2.59B
| $274K | ﹤0.01% |
26
+20
| +333% | +$2.01K |
|
3274
CALL
Old Republic International
ORI
$10.5B
| $274K | ﹤0.01% |
131
+12
| +10% | +$249 |
|
|
SPTN
3275
PUT
DELISTED
SpartanNash
SPTN
| $274K | ﹤0.01% |
173
-137
| -44% | -$2.63K |
|
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.