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 | |
|---|---|---|---|---|---|---|
3526
CALL
AtriCure
ATRC
$2.02B
| $187K | ﹤0.01% |
+63
| New | +$1.84K |
|
3527
CALL
Ironwood Pharmaceuticals
IRWD
$626M
| $187K | ﹤0.01% |
172
-51
| -23% | -$571 |
|
3528
PUT
TG Therapeutics
TGTX
$8.4B
| $187K | ﹤0.01% |
217
-195
| -47% | -$1.47K |
|
3529
WD-40
WDFC
$3.08B
| $187K | ﹤0.01% |
1,182
+1,051
| +802% | +$172K |
|
|
AYR
3530
CALL
DELISTED
Aircastle Ltd
AYR
| $187K | ﹤0.01% |
88
-19
| -18% | -$383 |
|
|
CVM.WS
3531
CALL
DELISTED
Cel-Sci Corp Series S
CVM.WS
| $187K | ﹤0.01% |
224
+157
| +234% | +$131K |
|
|
AMWD
3532
PUT
DELISTED
American Woodmark
AMWD
| $186K | ﹤0.01% |
22
-48
| -69% | -$4.05K |
|
3533
Copa Holdings
CPA
$5.71B
| $186K | ﹤0.01% |
1,910
-607
| -24% | -$53.8K |
|
3534
Monster Beverage
MNST
$95.6B
| $186K | ﹤0.01% |
5,846
-30,846
| -84% | -$929K |
|
|
AGEN
3535
Agenus
AGEN
$275M
| $185K | ﹤0.01% |
3,155
-944
| -23% | -$51.6K |
|
3536
PUT
Carter's
CRI
$1.45B
| $185K | ﹤0.01% |
19
-35
| -65% | -$3.41K |
|
3537
CALL
IPG Photonics
IPGP
$3.57B
| $185K | ﹤0.01% |
12
-127
| -91% | -$19.2K |
|
3538
PUT
OneSpan
OSPN
$572M
| $185K | ﹤0.01% |
131
-154
| -54% | -$2.45K |
|
|
POLY
3539
CALL
DELISTED
Plantronics, Inc.
POLY
| $185K | ﹤0.01% |
50
+45
| +900% | +$2.09K |
|
|
LMRK
3540
CALL
DELISTED
Landmark Infrastructure Partners LP Common Units
LMRK
| $185K | ﹤0.01% |
110
-21
| -16% | -$333 |
|
|
AXE
3541
PUT
DELISTED
Anixter International Inc
AXE
| $185K | ﹤0.01% |
31
-173
| -85% | -$10.2K |
|
|
PCMI
3542
PUT
DELISTED
PCM, Inc
PCMI
| $185K | ﹤0.01% |
53
+52
| +5,200% | +$1.53K |
|
3543
PUT
CorMedix
CRMD
$577M
| $184K | ﹤0.01% |
206
+199
| +2,843% | +$1.56K |
|
3544
CryoPort
CYRX
$765M
| $184K | ﹤0.01% |
10,092
+6,095
| +152% | +$96.7K |
|
3545
PUT
Daktronics
DAKT
$953M
| $184K | ﹤0.01% |
299
-1,110
| -79% | -$7.73K |
|
|
AZUL
3546
PUT
DELISTED
Azul
AZUL
| $183K | ﹤0.01% |
55
+29
| +112% | +$841 |
|
3547
Compugen
CGEN
$214M
| $183K | ﹤0.01% |
47,750
+31,624
| +196% | +$112K |
|
|
SEE
3548
PUT
DELISTED
Sealed Air
SEE
| $183K | ﹤0.01% |
43
-396
| -90% | -$17.4K |
|
3549
CALL
Dycom Industries
DY
$12.1B
| $182K | ﹤0.01% |
31
-53
| -63% | -$2.71K |
|
3550
CALL
FMC
FMC
$1.37B
| $182K | ﹤0.01% |
65
-10
| -13% | -$785 |
|
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.