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 | |
|---|---|---|---|---|---|---|
2326
PUT
DTE Energy
DTE
$31.1B
| $452K | ﹤0.01% |
48
+36
| +300% | +$3.52K |
|
2327
CALL
Galicia Financial Group
GGAL
$7.92B
| $452K | ﹤0.01% |
164
-2
| -1% | -$51 |
|
2328
Lennox International
LII
$18.8B
| $452K | ﹤0.01% |
2,066
+1,307
| +172% | +$276K |
|
2329
CALL
Abeona Therapeutics
ABEO
$345M
| $450K | ﹤0.01% |
25
+14
| +127% | +$3.05K |
|
|
AIV
2330
Aimco
AIV
$380M
| $450K | ﹤0.01% |
+77,065
| New | +$458K |
|
2331
Synchrony
SYF
$23.7B
| $450K | ﹤0.01% |
+19,219
| New | +$520K |
|
2332
CALL
Vipshop
VIPS
$6.84B
| $449K | ﹤0.01% |
824
-38
| -4% | -$205 |
|
|
ARQL
2333
CALL
DELISTED
Arqule Inc
ARQL
| $449K | ﹤0.01% |
1,623
+1,331
| +456% | +$5.08K |
|
2334
CALL
Griffon
GFF
$4.16B
| $447K | ﹤0.01% |
428
+397
| +1,281% | +$5.04K |
|
2335
PUT
LGI Homes
LGIH
$1.4B
| $447K | ﹤0.01% |
99
+37
| +60% | +$1.56K |
|
2336
CALL
Ligand Pharmaceuticals
LGND
$6.02B
| $447K | ﹤0.01% |
53
+3
| +6% | +$320 |
|
|
PRFT
2337
CALL
DELISTED
Perficient Inc
PRFT
| $447K | ﹤0.01% |
201
+119
| +145% | +$2.92K |
|
|
BLD
2338
CALL
DELISTED
TopBuild
BLD
| $445K | ﹤0.01% |
99
+89
| +890% | +$4.33K |
|
2339
PUT
Prothena Corp
PRTA
$458M
| $445K | ﹤0.01% |
433
-324
| -43% | -$3.85K |
|
2340
PUT
Zions Bancorporation
ZION
$10.1B
| $444K | ﹤0.01% |
109
-268
| -71% | -$12.5K |
|
|
MDSO
2341
DELISTED
Medidata Solutions, Inc.
MDSO
| $444K | ﹤0.01% |
6,590
+2,165
| +49% | +$153K |
|
2342
PUT
Golar LNG
GLNG
$4.95B
| $443K | ﹤0.01% |
204
-48
| -19% | -$1.24K |
|
2343
Nektar Therapeutics
NKTR
$2.39B
| $443K | ﹤0.01% |
899
-1,064
| -54% | -$642K |
|
|
CSOD
2344
PUT
DELISTED
Cornerstone OnDemand, Inc.
CSOD
| $443K | ﹤0.01% |
88
+33
| +60% | +$1.67K |
|
|
SPA
2345
PUT
DELISTED
Sparton
SPA
| $443K | ﹤0.01% |
244
+220
| +917% | +$3.23K |
|
|
NXTM
2346
PUT
DELISTED
NxStage Medical Inc.
NXTM
| $443K | ﹤0.01% |
155
+10
| +7% | +$284 |
|
2347
PUT
Vail Resorts
MTN
$5.19B
| $442K | ﹤0.01% |
21
-32
| -60% | -$7.91K |
|
|
OSG
2348
Octave Specialty Group
OSG
$252M
| $441K | ﹤0.01% |
25,584
-34,614
| -58% | -$635K |
|
2349
PUT
Regions Financial
RF
$26.3B
| $441K | ﹤0.01% |
330
+80
| +32% | +$1.28K |
|
2350
PUT
Alliant Energy
LNT
$19.4B
| $439K | ﹤0.01% |
104
-9
| -8% | -$396 |
|
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.