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 | |
|---|---|---|---|---|---|---|
|
SLAI
4551
PUT
DELISTED
SOLAI Ltd ADS
SLAI
| $69K | ﹤0.01% |
+1
| New | +$788 |
|
4552
Calix
CALX
$2.22B
| $69K | ﹤0.01% |
10,637
-21,681
| -67% | -$146K |
|
4553
CALL
Century Aluminum
CENX
$4.42B
| $69K | ﹤0.01% |
101
+74
| +274% | +$550 |
|
|
DVAX
4554
CALL
DELISTED
Dynavax Technologies
DVAX
| $69K | ﹤0.01% |
175
+31
| +22% | +$180 |
|
4555
CALL
Harmony Gold Mining
HMY
$9.77B
| $69K | ﹤0.01% |
304
-174
| -36% | -$321 |
|
4556
PUT
Huntsman Corp
HUN
$1.7B
| $69K | ﹤0.01% |
34
-144
| -81% | -$3.02K |
|
4557
PUT
Imperial Oil
IMO
$61.6B
| $69K | ﹤0.01% |
25
-62
| -71% | -$1.74K |
|
4558
Innospec
IOSP
$2.11B
| $69K | ﹤0.01% |
+757
| New | +$63.8K |
|
4559
CALL
Kodak
KODK
$803M
| $69K | ﹤0.01% |
290
-601
| -67% | -$1.49K |
|
4560
PUT
Insight Enterprises
NSIT
$3.86B
| $69K | ﹤0.01% |
12
+11
| +1,100% | +$613 |
|
4561
PetMed Express
PETS
$42.3M
| $69K | ﹤0.01% |
4,408
+1,950
| +79% | +$38.4K |
|
4562
Unifirst Corp
UNF
$5.29B
| $69K | ﹤0.01% |
+367
| New | +$59.4K |
|
|
BLCM
4563
DELISTED
Bellicum Pharmaceuticals, Inc.
BLCM
| $69K | ﹤0.01% |
4,103
+490
| +14% | +$13.3K |
|
|
LORL
4564
PUT
DELISTED
Loral Space and Communications, Inc.
LORL
| $69K | ﹤0.01% |
20
-1
| -5% | -$36 |
|
|
JCP
4565
PUT
DELISTED
J.C. Penney Company, Inc.
JCP
| $69K | ﹤0.01% |
609
+168
| +38% | +$200 |
|
4566
PUT
United States Brent Oil Fund
BNO
$779M
| $68K | ﹤0.01% |
36
+8
| +29% | +$157 |
|
|
4567
PUT
Calix
CALX
$2.22B
| $68K | ﹤0.01% |
105
-15
| -13% | -$101 |
|
4568
PUT
CareDx
CDNA
$2.21B
| $68K | ﹤0.01% |
19
-96
| -83% | -$3.07K |
|
4569
CALL
Conduent
CNDT
$240M
| $68K | ﹤0.01% |
71
+20
| +39% | +$216 |
|
|
GMS
4570
PUT
DELISTED
GMS Inc
GMS
| $68K | ﹤0.01% |
31
+10
| +48% | +$179 |
|
4571
iShares Russell 3000 ETF
IWV
$19.5B
| $68K | ﹤0.01% |
396
-1,524
| -79% | -$258K |
|
4572
Lazard
LAZ
$4.13B
| $68K | ﹤0.01% |
1,994
-6,275
| -76% | -$225K |
|
4573
PRA Group
PRAA
$653M
| $68K | ﹤0.01% |
2,427
+1,237
| +104% | +$35K |
|
4574
CALL
Wolverine World Wide
WWW
$1.59B
| $68K | ﹤0.01% |
25
-32
| -56% | -$1.02K |
|
4575
PUT
Yext
YEXT
$537M
| $68K | ﹤0.01% |
34
-13
| -28% | -$268 |
|
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.