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 |
iShares Russell 2000 ETF
IWM
|
+$58.5M |
| 2 |
Alphabet (Google) Class C
GOOG
|
+$56.5M |
| 3 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$44.1M |
| 4 |
Apple
AAPL
|
+$20.3M |
| 5 |
State Street SPDR S&P Oil & Gas Exploration & Production ETF
XOP
|
+$12.7M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$109M |
| 2 |
Meta Platforms (Facebook)
META
|
+$62.3M |
| 3 |
Invesco QQQ Trust
QQQ
|
+$36.2M |
| 4 |
Goldman Sachs
GS
|
+$27.1M |
| 5 |
Boeing
BA
|
+$24.7M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.49% |
| 2 | Consumer Discretionary | 0.48% |
| 3 | Technology | 0.4% |
| 4 | Financials | 0.25% |
| 5 | Industrials | 0.22% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
VG
2876
DELISTED
Vonage Holdings Corporation
VG
| $260K | ﹤0.01% |
29,874
+29,583
| +10,166% | +$339K |
|
2877
Global Payments
GPN
$23B
| $259K | ﹤0.01% |
2,516
+2,003
| +390% | +$221K |
|
2878
PUT
Vishay Intertechnology
VSH
$5.7B
| $259K | ﹤0.01% |
144
-31
| -18% | -$585 |
|
|
NS
2879
CALL
DELISTED
NuStar Energy L.P.
NS
| $259K | ﹤0.01% |
124
-43
| -26% | -$1.05K |
|
|
GRA
2880
PUT
DELISTED
W.R. Grace & Co.
GRA
| $259K | ﹤0.01% |
40
-81
| -67% | -$5.24K |
|
2881
PUT
Acacia Research
ACTG
$448M
| $258K | ﹤0.01% |
+868
| New | +$2.69K |
|
2882
Nokia
NOK
$51.8B
| $258K | ﹤0.01% |
44,401
+28,100
| +172% | +$158K |
|
2883
PUT
NovoCure
NVCR
$1.97B
| $257K | ﹤0.01% |
77
-14
| -15% | -$512 |
|
2884
Toll Brothers
TOL
$14.1B
| $257K | ﹤0.01% |
+7,821
| New | +$251K |
|
2885
Stoneridge
SRI
$210M
| $256K | ﹤0.01% |
10,425
+10,279
| +7,040% | +$261K |
|
2886
Whirlpool
WHR
$2.44B
| $256K | ﹤0.01% |
2,404
-11,257
| -82% | -$1.28M |
|
|
ACC
2887
CALL
DELISTED
American Campus Communities, Inc.
ACC
| $256K | ﹤0.01% |
62
+54
| +675% | +$2.24K |
|
|
JKS
2888
PUT
JinkoSolar
JKS
$799M
| $255K | ﹤0.01% |
258
-15
| -5% | -$148 |
|
|
SPTN
2889
DELISTED
SpartanNash
SPTN
| $255K | ﹤0.01% |
14,887
+14,377
| +2,819% | +$261K |
|
2890
PUT
SSR Mining
SSRM
$5.46B
| $255K | ﹤0.01% |
211
+5
| +2% | +$53 |
|
2891
PUT
Norwegian Cruise Line
NCLH
$9.2B
| $254K | ﹤0.01% |
60
-383
| -86% | -$18.6K |
|
2892
PUT
Veracyte
VCYT
$4.43B
| $254K | ﹤0.01% |
+202
| New | +$2.39K |
|
|
TTM.RT
2893
PUT
DELISTED
TATA MOTORS LIMITED RT PUR ADR
TTM.RT
| $254K | ﹤0.01% |
209
+106
| +103% | +$129K |
|
2894
PUT
Hartford Financial Services
HIG
$38.4B
| $253K | ﹤0.01% |
57
| – | – |
|
2895
NewMarket
NEU
$7.14B
| $253K | ﹤0.01% |
614
-618
| -50% | -$245K |
|
|
THS
2896
CALL
DELISTED
Treehouse Foods
THS
| $253K | ﹤0.01% |
50
-157
| -76% | -$7.74K |
|
2897
West Pharmaceutical
WST
$23.3B
| $253K | ﹤0.01% |
2,588
+2,361
| +1,040% | +$256K |
|
|
TGP
2898
CALL
DELISTED
Teekay LNG Partners L.P.
TGP
| $253K | ﹤0.01% |
230
+209
| +995% | +$2.95K |
|
2899
CALL
Bilibili
BILI
$7.47B
| $252K | ﹤0.01% |
173
-102
| -37% | -$1.43K |
|
2900
National Beverage
FIZZ
$2.93B
| $252K | ﹤0.01% |
+7,046
| New | +$325K |
|
Similar funds
Simplex Trading's Q4 2018 Portfolio in Review
As of Q4 2018, Simplex Trading held 8,576 positions worth $34.1B, up 9.5% from $31.1B the previous quarter. Its ten largest holdings account for 43% of the portfolio.
Simplex Trading's Q4 2018 filing shows 1,199 new, 2,701 increased, 2,877 reduced and 1,573 closed positions. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M. The largest sale was Amazon, an estimated $109M.
By sector, the portfolio is most concentrated in Communication Services at 0.49% of assets, down from 0.89% a quarter earlier, followed by Consumer Discretionary and Technology.
- Simplex Trading's largest Q4 2018 buy was State Street SPDR S&P 500 ETF Trust: 163,699 shares worth $40.9M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q4 2018, an estimated $58.5M increase.
- Simplex Trading's biggest Q4 2018 reduction was Amazon, cutting an estimated $109M.
- Simplex Trading fully exited Meta Platforms (Facebook) in Q4 2018, selling an estimated $62.3M.
- Simplex Trading's ten largest holdings make up 43% of its $34.1B portfolio in Q4 2018.
- Simplex Trading opened 1,199 new positions and closed 1,573 in Q4 2018.
- Simplex Trading's portfolio value rose 9.5% quarter-over-quarter to $34.1B.
Based on Simplex Trading's 13F filing for Q4 2018, filed 16 Jan 2019.