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 | |
|---|---|---|---|---|---|---|
801
PUT
Vail Resorts
MTN
$5.13B
| $4.21M | 0.01% |
194
+173
| +824% | +$35.3K |
|
802
PUT
Archer Daniels Midland
ADM
$41.6B
| $4.21M | 0.01% |
976
+714
| +273% | +$30.5K |
|
803
CALL
Eastman Chemical
EMN
$7.77B
| $4.2M | 0.01% |
553
+339
| +158% | +$26.9K |
|
804
Southern Company
SO
$109B
| $4.19M | 0.01% |
+81,172
| New | +$3.98M |
|
805
PUT
United Therapeutics
UTHR
$26.4B
| $4.19M | 0.01% |
357
+243
| +213% | +$28.3K |
|
806
PUT
VF Corp
VFC
$6.49B
| $4.19M | 0.01% |
512
+389
| +316% | +$30.3K |
|
|
B
807
CALL
Barrick Mining
B
$62.3B
| $4.17M | 0.01% |
3,045
+141
| +5% | +$1.82K |
|
808
Nutanix
NTNX
$14.2B
| $4.17M | 0.01% |
110,476
+7,063
| +7% | +$323K |
|
|
TYNS
809
CALL
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $4.17M | 0.01% |
836
-146
| -15% | -$4.1K |
|
|
DISCK
810
PUT
DELISTED
Discovery, Inc. Series C Common Stock
DISCK
| $4.14M | 0.01% |
1,553
+528
| +52% | +$13.8K |
|
811
CALL
Invesco CurrencyShares British Pound Sterling Trust
FXB
$76.9M
| $4.14M | 0.01% |
328
-163
| -33% | -$20.6K |
|
812
PUT
Lear
LEA
$7.14B
| $4.13M | 0.01% |
304
-48
| -14% | -$7.04K |
|
813
PUT
Atlassian
TEAM
$20.3B
| $4.12M | 0.01% |
367
+153
| +71% | +$15.6K |
|
814
PUT
Alcoa
AA
$11.9B
| $4.12M | 0.01% |
1,464
+734
| +101% | +$21K |
|
|
CTLT
815
PUT
DELISTED
CATALENT, INC.
CTLT
| $4.11M | 0.01% |
1,012
+1,002
| +10,020% | +$39.2K |
|
|
BNY
816
PUT
Bank of New York Mellon
BNY
$109B
| $4.11M | 0.01% |
814
-448
| -35% | -$23.1K |
|
817
CALL
Eagle Materials
EXP
$6.4B
| $4.09M | 0.01% |
485
+267
| +122% | +$19.3K |
|
818
PG&E
PCG
$38.6B
| $4.08M | 0.01% |
229,224
+228,224
| +22,822% | +$3.69M |
|
|
819
CALL
Atlassian
TEAM
$20.3B
| $4.08M | 0.01% |
363
+200
| +123% | +$20.4K |
|
820
PUT
TE Connectivity
TEL
$58B
| $4.08M | 0.01% |
505
+295
| +140% | +$23.8K |
|
821
PUT
Advance Auto Parts
AAP
$3.22B
| $4.08M | 0.01% |
239
-273
| -53% | -$44.1K |
|
822
PUT
Quest Diagnostics
DGX
$25.2B
| $4.07M | 0.01% |
453
+414
| +1,062% | +$35.9K |
|
823
CALL
KLA
KLAC
$286B
| $4.07M | 0.01% |
3,410
+900
| +36% | +$9.68K |
|
|
RP
824
CALL
DELISTED
RealPage, Inc.
RP
| $4.07M | 0.01% |
670
+627
| +1,458% | +$35.9K |
|
825
PUT
Euronet Worldwide
EEFT
$2.94B
| $4.06M | 0.01% |
285
+240
| +533% | +$29.9K |
|
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.