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 | |
|---|---|---|---|---|---|---|
751
CALL
Martin Marietta Materials
MLM
$32.8B
| $4.49M | 0.01% |
223
-50
| -18% | -$9.33K |
|
752
CALL
Gen Digital
GEN
$15.1B
| $4.49M | 0.01% |
1,951
+187
| +11% | +$4.07K |
|
753
CALL
Keurig Dr Pepper
KDP
$40.4B
| $4.48M | 0.01% |
1,602
-415
| -21% | -$11.2K |
|
754
CALL
HP
HPQ
$22.4B
| $4.46M | 0.01% |
2,296
+1,485
| +183% | +$31.5K |
|
755
CALL
Cracker Barrel
CBRL
$1.16B
| $4.46M | 0.01% |
276
+202
| +273% | +$33.2K |
|
|
SCHW
756
PUT
Charles Schwab
SCHW
$177B
| $4.46M | 0.01% |
1,043
+33
| +3% | +$1.49K |
|
757
CALL
Genuine Parts
GPC
$16.6B
| $4.46M | 0.01% |
398
+55
| +16% | +$5.69K |
|
758
PUT
Trimble
TRMB
$11.7B
| $4.45M | 0.01% |
1,102
+1,085
| +6,382% | +$41.2K |
|
|
LKFT
759
CALL
Lakefront Biotherapeutics American Depositary Shares
LKFT
$1.84B
| $4.44M | 0.01% |
377
+376
| +37,600% | +$37.9K |
|
760
CALL
iShares Convertible Bond ETF
ICVT
$7.37B
| $4.43M | 0.01% |
1,336
+203
| +18% | +$11.5K |
|
761
CALL
Progressive
PGR
$120B
| $4.43M | 0.01% |
615
-134
| -18% | -$9.18K |
|
762
PUT
Ciena
CIEN
$57.7B
| $4.43M | 0.01% |
1,187
+574
| +94% | +$22.3K |
|
|
SPR
763
CALL
DELISTED
Spirit AeroSystems
SPR
| $4.43M | 0.01% |
484
+453
| +1,461% | +$40K |
|
764
PUT
Jacobs Solutions
J
$15.6B
| $4.42M | 0.01% |
711
+665
| +1,446% | +$37.5K |
|
765
PUT
Parker-Hannifin
PH
$124B
| $4.41M | 0.01% |
257
-132
| -34% | -$21.9K |
|
766
iShares MSCI EAFE ETF
EFA
$76.1B
| $4.41M | 0.01% |
67,982
+63,854
| +1,547% | +$4.02M |
|
767
PUT
Aptiv
APTV
$11.9B
| $4.4M | 0.01% |
554
+14
| +3% | +$1.07K |
|
768
PUT
Five Below
FIVE
$11.1B
| $4.4M | 0.01% |
354
+141
| +66% | +$17.1K |
|
769
SAP
SAP
$171B
| $4.39M | 0.01% |
38,058
+36,277
| +2,037% | +$3.86M |
|
770
CALL
ArcelorMittal
MT
$49.9B
| $4.39M | 0.01% |
2,155
+886
| +70% | +$19.6K |
|
771
PUT
TripAdvisor
TRIP
$1.57B
| $4.39M | 0.01% |
853
-144
| -14% | -$7.89K |
|
772
PUT
United States Natural Gas Fund
UNG
$473M
| $4.39M | 0.01% |
467
+104
| +29% | +$10.4K |
|
773
CALL
Skyworks Solutions
SWKS
$9.1B
| $4.38M | 0.01% |
531
+265
| +100% | +$20.5K |
|
774
PUT
PPG Industries
PPG
$25.4B
| $4.37M | 0.01% |
387
+171
| +79% | +$18.3K |
|
775
PUT
NCR Voyix
VYX
$1.05B
| $4.36M | 0.01% |
2,605
+2,455
| +1,637% | +$40.7K |
|
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.