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 | |
|---|---|---|---|---|---|---|
626
PUT
TransDigm Group
TDG
$67.9B
| $5.45M | 0.02% |
120
+45
| +60% | +$18.3K |
|
627
Bristol-Myers Squibb
BMY
$126B
| $5.44M | 0.02% |
114,093
+9,772
| +9% | +$487K |
|
|
AMRN
628
PUT
Amarin Corp
AMRN
$285M
| $5.41M | 0.02% |
130
-313
| -71% | -$113K |
|
629
JD.com
JD
$40.6B
| $5.41M | 0.02% |
179,451
+2,398
| +1% | +$61K |
|
630
PUT
MSCI
MSCI
$40.2B
| $5.41M | 0.02% |
272
+71
| +35% | +$12.4K |
|
|
IRBT
631
CALL
DELISTED
iRobot
IRBT
| $5.38M | 0.02% |
457
+45
| +11% | +$4.79K |
|
632
CALL
GSK
GSK
$102B
| $5.37M | 0.01% |
1,029
+391
| +61% | +$19.5K |
|
633
CALL
Fastenal
FAST
$53B
| $5.37M | 0.01% |
3,340
-656
| -16% | -$9.87K |
|
634
PUT
Cardinal Health
CAH
$52.9B
| $5.36M | 0.01% |
1,113
+222
| +25% | +$11.1K |
|
635
PUT
Blackstone
BX
$152B
| $5.36M | 0.01% |
1,532
+116
| +8% | +$3.87K |
|
|
GAP
636
PUT
The Gap Inc
GAP
$6.8B
| $5.35M | 0.01% |
2,044
+987
| +93% | +$25.2K |
|
637
CALL
Planet Fitness
PLNT
$4.29B
| $5.35M | 0.01% |
778
+416
| +115% | +$25.2K |
|
638
PUT
TJX Companies
TJX
$170B
| $5.34M | 0.01% |
1,004
-739
| -42% | -$36.8K |
|
|
MLNX
639
PUT
DELISTED
Mellanox Technologies, Ltd.
MLNX
| $5.34M | 0.01% |
451
+374
| +486% | +$37.6K |
|
640
CALL
Weibo
WB
$1.92B
| $5.31M | 0.01% |
857
+526
| +159% | +$32.6K |
|
|
ETFC
641
PUT
DELISTED
E*Trade Financial Corporation
ETFC
| $5.3M | 0.01% |
1,141
-133
| -10% | -$6.33K |
|
642
PUT
IQVIA
IQV
$34.6B
| $5.29M | 0.01% |
368
+134
| +57% | +$17.9K |
|
|
FRC
643
PUT
DELISTED
First Republic Bank
FRC
| $5.27M | 0.01% |
525
+393
| +298% | +$38.7K |
|
644
CALL
Ford
F
$56.4B
| $5.26M | 0.01% |
5,993
+4,717
| +370% | +$40.5K |
|
645
CALL
Dominion Energy
D
$62.8B
| $5.25M | 0.01% |
685
+34
| +5% | +$2.48K |
|
646
PUT
Vulcan Materials
VMC
$35.7B
| $5.25M | 0.01% |
443
-20
| -4% | -$2.16K |
|
647
PUT
Huntington Ingalls Industries
HII
$11.3B
| $5.24M | 0.01% |
253
+155
| +158% | +$31.8K |
|
648
CALL
Nutanix
NTNX
$14.2B
| $5.24M | 0.01% |
1,388
+162
| +13% | +$7.41K |
|
|
SCHW
649
CALL
Charles Schwab
SCHW
$177B
| $5.24M | 0.01% |
1,225
-635
| -34% | -$28.7K |
|
650
CALL
Cheniere Energy
LNG
$57B
| $5.24M | 0.01% |
766
+444
| +138% | +$29.2K |
|
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.