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 | |
|---|---|---|---|---|---|---|
|
GRMN
851
CALL
Garmin
GRMN
$46.3B
| $3.87M | 0.01% |
448
+25
| +6% | +$1.88K |
|
|
COUP
852
DELISTED
Coupa Software Incorporated
COUP
| $3.87M | 0.01% |
42,506
+22,952
| +117% | +$1.97M |
|
853
PUT
CF Industries
CF
$19.5B
| $3.86M | 0.01% |
945
+154
| +19% | +$6.53K |
|
854
CALL
Cummins
CMI
$91.8B
| $3.85M | 0.01% |
244
-291
| -54% | -$43.7K |
|
855
Medtronic
MDT
$105B
| $3.85M | 0.01% |
+42,293
| New | +$3.79M |
|
856
CALL
State Street SPDR Portfolio Europe ETF
SPEU
$707M
| $3.85M | 0.01% |
1,043
+915
| +715% | +$29.2K |
|
857
PUT
Monolithic Power Systems
MPWR
$68.6B
| $3.85M | 0.01% |
284
+247
| +668% | +$32.4K |
|
|
CYBR
858
CALL
DELISTED
CyberArk
CYBR
| $3.85M | 0.01% |
323
+6
| +2% | +$574 |
|
859
PUT
Agios Pharmaceuticals
AGIO
$2.16B
| $3.84M | 0.01% |
570
+72
| +14% | +$4.19K |
|
|
CTXS
860
DELISTED
Citrix Systems Inc
CTXS
| $3.84M | 0.01% |
38,528
-1,697
| -4% | -$176K |
|
|
TRHC
861
CALL
DELISTED
Tabula Rasa HealthCare, Inc. Common Stock
TRHC
| $3.84M | 0.01% |
680
+673
| +9,614% | +$40.1K |
|
862
PUT
BioMarin Pharmaceuticals
BMRN
$11.4B
| $3.81M | 0.01% |
429
+238
| +125% | +$22.1K |
|
863
CALL
Kohl's
KSS
$2.06B
| $3.81M | 0.01% |
554
-382
| -41% | -$25.9K |
|
|
ELLI
864
CALL
DELISTED
Ellie Mae Inc
ELLI
| $3.81M | 0.01% |
386
+324
| +523% | +$28.1K |
|
|
MLNX
865
DELISTED
Mellanox Technologies, Ltd.
MLNX
| $3.81M | 0.01% |
32,173
+24,944
| +345% | +$2.51M |
|
866
Humana
HUM
$47.4B
| $3.81M | 0.01% |
+14,307
| New | +$4.12M |
|
867
CALL
Exelixis
EXEL
$14B
| $3.8M | 0.01% |
1,595
+213
| +15% | +$4.86K |
|
868
PUT
Synchrony
SYF
$23.3B
| $3.8M | 0.01% |
1,190
-664
| -36% | -$20K |
|
869
PUT
KB Home
KBH
$3.41B
| $3.79M | 0.01% |
1,570
-22
| -1% | -$487 |
|
870
PUT
Gartner
IT
$8.95B
| $3.79M | 0.01% |
250
+8
| +3% | +$1.11K |
|
|
DATA
871
CALL
DELISTED
Tableau Software, Inc.
DATA
| $3.79M | 0.01% |
298
-378
| -56% | -$47.7K |
|
|
OPLN
872
CALL
Openlane
OPLN
$4.13B
| $3.79M | 0.01% |
1,952
-56
| -3% | -$1.06K |
|
873
CALL
Hilton Worldwide
HLT
$72.9B
| $3.79M | 0.01% |
456
+184
| +68% | +$14.4K |
|
874
CALL
NetApp
NTAP
$32.3B
| $3.77M | 0.01% |
544
-55
| -9% | -$3.55K |
|
875
Truist Financial
TFC
$62.5B
| $3.77M | 0.01% |
+81,067
| New | +$3.95M |
|
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.