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 | |
|---|---|---|---|---|---|---|
576
PUT
NXP Semiconductors
NXPI
$69.4B
| $6.11M | 0.02% |
691
-1,924
| -74% | -$169K |
|
|
SPLK
577
CALL
DELISTED
Splunk Inc
SPLK
| $6.11M | 0.02% |
490
-247
| -34% | -$30.8K |
|
578
PUT
ASML
ASML
$689B
| $6.09M | 0.02% |
324
-5
| -2% | -$885 |
|
579
CALL
Kinder Morgan
KMI
$72.7B
| $6.08M | 0.02% |
3,036
-237
| -7% | -$4.42K |
|
580
PUT
First Trust Natural Gas ETF
FCG
$639M
| $6.06M | 0.02% |
510
+341
| +202% | +$5.74K |
|
581
PUT
Rio Tinto
RIO
$148B
| $6.05M | 0.02% |
1,029
-9
| -0.9% | -$495 |
|
582
CALL
Marriott International
MAR
$95.6B
| $6.03M | 0.02% |
482
+3
| +0.6% | +$353 |
|
583
PUT
Labcorp
LH
$23.9B
| $6.03M | 0.02% |
459
+452
| +6,457% | +$55.7K |
|
584
PUT
Ubiquiti
UI
$32B
| $6.02M | 0.02% |
402
+326
| +429% | +$41.1K |
|
585
CALL
Microchip Technology
MCHP
$44.1B
| $6.01M | 0.02% |
1,448
+592
| +69% | +$24.5K |
|
586
CALL
Okta
OKTA
$23.5B
| $5.99M | 0.02% |
724
+529
| +271% | +$41.9K |
|
587
CALL
Danaher
DHR
$134B
| $5.98M | 0.02% |
511
-61
| -11% | -$6.25K |
|
588
CALL
Centene
CNC
$31.4B
| $5.98M | 0.02% |
1,126
+498
| +79% | +$30.2K |
|
589
CALL
Bio-Rad Laboratories Class A
BIO
$8.39B
| $5.96M | 0.02% |
195
+170
| +680% | +$45.9K |
|
590
PUT
McKesson
MCK
$95.8B
| $5.96M | 0.02% |
509
-633
| -55% | -$78.1K |
|
591
PUT
Global Payments
GPN
$21.2B
| $5.95M | 0.02% |
436
+158
| +57% | +$19.2K |
|
592
PUT
Hilton Worldwide
HLT
$72.5B
| $5.94M | 0.02% |
715
+416
| +139% | +$32.6K |
|
593
Lumen
LUMN
$6.65B
| $5.86M | 0.02% |
+488,637
| New | +$6.79M |
|
594
CALL
Zoetis
ZTS
$30.9B
| $5.85M | 0.02% |
581
-9
| -2% | -$817 |
|
|
ARRY
595
CALL
DELISTED
Array Biopharma Inc
ARRY
| $5.84M | 0.02% |
2,395
+1,578
| +193% | +$32.9K |
|
596
CALL
Emerson Electric
EMR
$80.7B
| $5.83M | 0.02% |
852
-34
| -4% | -$2.24K |
|
|
LOGM
597
PUT
DELISTED
LogMein, Inc.
LOGM
| $5.83M | 0.02% |
728
+671
| +1,177% | +$57.3K |
|
|
FL
598
PUT
DELISTED
Foot Locker
FL
| $5.82M | 0.02% |
961
+627
| +188% | +$36.5K |
|
599
PUT
ProShares Ultra S&P500
SSO
$7.79B
| $5.82M | 0.02% |
4,904
-192
| -4% | -$2.62K |
|
|
ULTI
600
CALL
DELISTED
Ultimate Software Group Inc
ULTI
| $5.81M | 0.02% |
176
+135
| +329% | +$41.4K |
|
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.