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 | |
|---|---|---|---|---|---|---|
3701
VanEck Brazil Small-Cap ETF
BRF
$21.5M
| $159K | ﹤0.01% |
6,615
-3,709
| -36% | -$81.2K |
|
|
MAG
3702
PUT
DELISTED
MAG Silver
MAG
| $159K | ﹤0.01% |
151
+82
| +119% | +$822 |
|
3703
CALL
Natural Resource Partners
NRP
$1.31B
| $159K | ﹤0.01% |
45
-83
| -65% | -$3.32K |
|
3704
PUT
Steven Madden
SHOO
$3.17B
| $159K | ﹤0.01% |
47
-461
| -91% | -$15.2K |
|
|
SNBR
3705
DELISTED
Sleep Number
SNBR
| $159K | ﹤0.01% |
3,951
-2,130
| -35% | -$82.3K |
|
3706
PUT
UFP Industries
UFPI
$4.95B
| $159K | ﹤0.01% |
42
-10
| -19% | -$347 |
|
3707
PUT
Universal Insurance Holdings
UVE
$1.26B
| $159K | ﹤0.01% |
57
+38
| +200% | +$1.11K |
|
3708
AeroVironment
AVAV
$7.19B
| $158K | ﹤0.01% |
+2,795
| New | +$184K |
|
3709
Microchip Technology
MCHP
$38.8B
| $158K | ﹤0.01% |
3,648
-66,696
| -95% | -$2.96M |
|
3710
CALL
Tronox
TROX
$967M
| $158K | ﹤0.01% |
124
+110
| +786% | +$1.35K |
|
3711
ProShares UltraShort Bloomberg Natural Gas
KOLD
$119M
| $157K | ﹤0.01% |
515
+236
| +85% | +$62.1K |
|
3712
Perrigo
PRGO
$1.44B
| $157K | ﹤0.01% |
+3,303
| New | +$157K |
|
3713
PUT
RadNet
RDNT
$4.98B
| $157K | ﹤0.01% |
114
+54
| +90% | +$693 |
|
3714
PUT
Atara Biotherapeutics
ATRA
$72.6M
| $156K | ﹤0.01% |
3
| – | – |
|
|
FISV
3715
Fiserv Inc
FISV
$29.7B
| $156K | ﹤0.01% |
1,720
-162
| -9% | -$14.2K |
|
3716
PUT
Frontdoor
FTDR
$5.27B
| $156K | ﹤0.01% |
36
-208
| -85% | -$7.99K |
|
3717
PUT
Gerdau
GGB
$9.54B
| $156K | ﹤0.01% |
507
-555
| -52% | -$1.63K |
|
3718
PUT
Jazz Pharmaceuticals
JAZZ
$16.1B
| $156K | ﹤0.01% |
11
-178
| -94% | -$23.9K |
|
3719
CALL
MakeMyTrip
MMYT
$5.38B
| $156K | ﹤0.01% |
63
+6
| +11% | +$152 |
|
|
3720
Steven Madden
SHOO
$3.17B
| $156K | ﹤0.01% |
4,600
-97
| -2% | -$3.19K |
|
|
ACC
3721
PUT
DELISTED
American Campus Communities, Inc.
ACC
| $156K | ﹤0.01% |
34
+28
| +467% | +$1.31K |
|
|
FLY
3722
PUT
DELISTED
Fly Leasing Limited
FLY
| $156K | ﹤0.01% |
90
+74
| +463% | +$1.16K |
|
3723
United States Brent Oil Fund
BNO
$782M
| $155K | ﹤0.01% |
8,202
+3,140
| +62% | +$61.7K |
|
3724
CALL
Genworth Financial
GNW
$3.86B
| $155K | ﹤0.01% |
419
-661
| -61% | -$2.34K |
|
3725
Halozyme
HALO
$9.88B
| $155K | ﹤0.01% |
9,071
-491
| -5% | -$7.92K |
|
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.