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 | |
|---|---|---|---|---|---|---|
2751
CALL
Alaunos Therapeutics
TCRT
$4.71M
| $413K | ﹤0.01% |
5
+3
| +150% | +$2.06K |
|
2752
CALL
Domo
DOMO
$161M
| $412K | ﹤0.01% |
151
-105
| -41% | -$3.65K |
|
2753
PUT
First Financial Bankshares
FFIN
$4.94B
| $412K | ﹤0.01% |
134
-132
| -50% | -$3.97K |
|
2754
PUT
Inspire Medical Systems
INSP
$1.47B
| $412K | ﹤0.01% |
68
-59
| -46% | -$3.18K |
|
2755
PUT
Atmos Energy
ATO
$29.7B
| $411K | ﹤0.01% |
39
+35
| +875% | +$3.58K |
|
2756
CALL
Lincoln Electric
LECO
$14.1B
| $411K | ﹤0.01% |
50
-14
| -22% | -$1.16K |
|
|
HEXO
2757
CALL
DELISTED
HEXO Corp. Common Shares
HEXO
| $411K | ﹤0.01% |
14
-9
| -39% | -$3.33K |
|
|
TUFN
2758
PUT
DELISTED
Tufin Software Technologies Ltd.
TUFN
| $411K | ﹤0.01% |
+159
| New | +$3.6K |
|
2759
PUT
Autohome
ATHM
$2.46B
| $410K | ﹤0.01% |
48
-12
| -20% | -$1.2K |
|
2760
PUT
Tenaris
TS
$28.5B
| $410K | ﹤0.01% |
156
-20
| -11% | -$535 |
|
|
SRCL
2761
PUT
DELISTED
Stericycle Inc
SRCL
| $410K | ﹤0.01% |
86
+34
| +65% | +$1.73K |
|
|
LTHM
2762
DELISTED
Livent Corporation
LTHM
| $409K | ﹤0.01% |
+59,240
| New | +$532K |
|
|
LABL
2763
CALL
DELISTED
Multi-Color Corp
LABL
| $409K | ﹤0.01% |
82
-63
| -43% | -$3.15K |
|
2764
PUT
Acadia Healthcare
ACHC
$2.99B
| $408K | ﹤0.01% |
117
+14
| +14% | +$453 |
|
2765
CALL
Pinnacle Financial Partners Inc
PNFP
$15.6B
| $408K | ﹤0.01% |
71
-29
| -29% | -$1.63K |
|
2766
CALL
Sturm, Ruger & Co
RGR
$620M
| $408K | ﹤0.01% |
75
+48
| +178% | +$2.55K |
|
2767
CALL
LiveRamp
RAMP
$2.3B
| $407K | ﹤0.01% |
84
-67
| -44% | -$3.63K |
|
2768
CALL
Woodward
WWD
$25B
| $407K | ﹤0.01% |
36
+28
| +350% | +$3K |
|
|
SAGE
2769
DELISTED
Sage Therapeutics
SAGE
| $406K | ﹤0.01% |
+2,218
| New | +$378K |
|
2770
CALL
Saic
SAIC
$5.01B
| $406K | ﹤0.01% |
47
-66
| -58% | -$5.18K |
|
2771
Dropbox
DBX
$7.13B
| $405K | ﹤0.01% |
16,179
-13,980
| -46% | -$323K |
|
2772
CALL
Dick's Sporting Goods
DKS
$18.4B
| $405K | ﹤0.01% |
117
-467
| -80% | -$17.1K |
|
2773
CALL
Jacobs Solutions
J
$16B
| $405K | ﹤0.01% |
58
-311
| -84% | -$20.1K |
|
|
JKS
2774
CALL
JinkoSolar
JKS
$799M
| $405K | ﹤0.01% |
187
-247
| -57% | -$4.99K |
|
2775
PUT
UGI
UGI
$7.91B
| $405K | ﹤0.01% |
+76
| New | +$4.04K |
|
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.