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 |
NVIDIA
NVDA
|
+$29.6M |
| 2 |
State Street Industrial Select Sector SPDR ETF
XLI
|
+$22.6M |
| 3 |
iShares Russell 2000 ETF
IWM
|
+$17.9M |
| 4 |
Netflix
NFLX
|
+$17.1M |
| 5 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$13.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Invesco QQQ Trust
QQQ
|
+$123M |
| 2 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$40.6M |
| 3 |
Walt Disney
DIS
|
+$25.6M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$13.5M |
| 5 |
Johnson & Johnson
JNJ
|
+$11.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.5% |
| 2 | Communication Services | 0.5% |
| 3 | Healthcare | 0.35% |
| 4 | Industrials | 0.3% |
| 5 | Consumer Discretionary | 0.26% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
426
CALL
EOG Resources
EOG
$77.5B
| $9.2M | 0.03% |
988
-813
| -45% | -$75.6K |
|
427
PUT
SBA Communications
SBAC
$18.5B
| $9.2M | 0.03% |
409
-264
| -39% | -$55.7K |
|
428
PUT
Stryker
SYK
$122B
| $9.19M | 0.03% |
447
+425
| +1,932% | +$81.2K |
|
429
Bristol-Myers Squibb
BMY
$126B
| $9.15M | 0.03% |
201,734
+87,641
| +77% | +$4.08M |
|
430
CALL
State Street SPDR S&P MIDCAP 400 ETF Trust
MDY
$26.9B
| $9.08M | 0.02% |
256
+4
| +2% | +$1.4K |
|
|
ETFC
431
PUT
DELISTED
E*Trade Financial Corporation
ETFC
| $9.08M | 0.02% |
2,035
+894
| +78% | +$42.7K |
|
|
HES
432
CALL
DELISTED
Hess
HES
| $9.06M | 0.02% |
1,426
+837
| +142% | +$51.8K |
|
433
CALL
Fox Class B
FOX
$20.7B
| $9.06M | 0.02% |
+2,474
| New | +$89.8K |
|
434
CALL
Illumina
ILMN
$29.8B
| $9.06M | 0.02% |
253
-289
| -53% | -$91.3K |
|
435
PUT
McKesson
MCK
$96.5B
| $9.03M | 0.02% |
672
+163
| +32% | +$20.3K |
|
436
CALL
Baxter International
BAX
$11.2B
| $8.97M | 0.02% |
1,095
+570
| +109% | +$44.3K |
|
437
CALL
GE Aerospace
GE
$362B
| $8.96M | 0.02% |
1,713
-1,698
| -50% | -$83.6K |
|
438
CALL
D.R. Horton
DHI
$39.9B
| $8.94M | 0.02% |
2,073
+155
| +8% | +$6.86K |
|
439
CALL
Universal Display
OLED
$3.71B
| $8.93M | 0.02% |
475
-415
| -47% | -$69K |
|
440
CALL
Ecolab
ECL
$74.1B
| $8.87M | 0.02% |
449
+397
| +763% | +$73.8K |
|
|
LSI
441
PUT
DELISTED
Life Storage, Inc.
LSI
| $8.86M | 0.02% |
1,398
-219
| -14% | -$14.1K |
|
442
PUT
WisdomTree US Total Dividend Fund
DTD
$1.64B
| $8.86M | 0.02% |
5,548
+818
| +17% | +$39.2K |
|
443
CALL
General Dynamics
GD
$103B
| $8.85M | 0.02% |
487
+304
| +166% | +$52.3K |
|
444
CALL
WIX.com
WIX
$2.04B
| $8.85M | 0.02% |
623
+356
| +133% | +$48K |
|
445
PUT
CarMax
KMX
$8.29B
| $8.79M | 0.02% |
1,012
-922
| -48% | -$72.1K |
|
446
PUT
Equinix
EQIX
$102B
| $8.77M | 0.02% |
174
+30
| +21% | +$14.4K |
|
447
PUT
Etsy
ETSY
$7.68B
| $8.76M | 0.02% |
1,427
-210
| -13% | -$13.7K |
|
448
CALL
Kroger
KR
$34.2B
| $8.75M | 0.02% |
4,031
+2,090
| +108% | +$50.8K |
|
449
CALL
Prudential Financial
PRU
$40.9B
| $8.74M | 0.02% |
865
-196
| -18% | -$19.5K |
|
450
CALL
Illinois Tool Works
ITW
$79.7B
| $8.73M | 0.02% |
579
+248
| +75% | +$37.4K |
|
Similar funds
Simplex Trading's Q2 2019 Portfolio in Review
As of Q2 2019, Simplex Trading held 8,406 positions worth $36.6B, up 1.9% from $36B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q2 2019 filing shows 1,261 new, 2,604 increased, 3,015 reduced and 1,301 closed positions. Its largest new stake was iShares 20+ Year Treasury Bond ETF: 105,724 shares worth $14M. The largest sale was Invesco QQQ Trust, an estimated $123M.
By sector, the portfolio is most concentrated in Technology at 0.5% of assets, up from 0.42% a quarter earlier, followed by Communication Services and Healthcare.
- Simplex Trading's largest Q2 2019 buy was iShares 20+ Year Treasury Bond ETF: 105,724 shares worth $14M.
- Simplex Trading added most to NVIDIA in Q2 2019, an estimated $29.6M increase.
- Simplex Trading's biggest Q2 2019 reduction was State Street SPDR S&P 500 ETF Trust, cutting an estimated $40.6M.
- Simplex Trading fully exited Invesco QQQ Trust in Q2 2019, selling an estimated $123M.
- Simplex Trading's ten largest holdings make up 35% of its $36.6B portfolio in Q2 2019.
- Simplex Trading opened 1,261 new positions and closed 1,301 in Q2 2019.
- Simplex Trading's portfolio value rose 1.9% quarter-over-quarter to $36.6B.
Based on Simplex Trading's 13F filing for Q2 2019, filed 26 Jul 2019.