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 |
State Street SPDR S&P 500 ETF Trust
SPY
|
+$49.8M |
| 2 |
Apple
AAPL
|
+$24.5M |
| 3 |
Citigroup
C
|
+$23.5M |
| 4 |
Amazon
AMZN
|
+$22.7M |
| 5 |
Alphabet (Google) Class C
GOOG
|
+$18.5M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
LNKD
LinkedIn Corporation
LNKD
|
+$17.4M |
| 2 |
Wells Fargo
WFC
|
+$13.5M |
| 3 |
MDVN
MEDIVATION, INC.
MDVN
|
+$8.62M |
| 4 |
Goldman Sachs
GS
|
+$8.5M |
| 5 |
iShares iBoxx $ High Yield Corporate Bond ETF
HYG
|
+$8.15M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 8.76% |
| 2 | Technology | 7.19% |
| 3 | Healthcare | 6.91% |
| 4 | Consumer Discretionary | 6.53% |
| 5 | Financials | 5.37% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
3301
PUT
Coeur Mining
CDE
$15.8B
| $15K | ﹤0.01% |
65
-58
| -47% | -$596 |
|
3302
CALL
Cognex
CGNX
$10.2B
| $15K | ﹤0.01% |
54
-52
| -49% | -$1.49K |
|
3303
Commault Systems
CVLT
$6.19B
| $15K | ﹤0.01% |
+303
| New | +$16.2K |
|
3304
CALL
D.R. Horton
DHI
$41.3B
| $15K | ﹤0.01% |
538
+250
| +87% | +$7.14K |
|
3305
PUT
Digital Realty Trust
DLR
$72.4B
| $15K | ﹤0.01% |
142
-27
| -16% | -$2.51K |
|
3306
CALL
DexCom
DXCM
$28.3B
| $15K | ﹤0.01% |
800
-940
| -54% | -$16.7K |
|
3307
CALL
Essent Group
ESNT
$6.12B
| $15K | ﹤0.01% |
+105
| New | +$3.09K |
|
3308
CALL
Etsy
ETSY
$7.96B
| $15K | ﹤0.01% |
328
-3
| -0.9% | -$39 |
|
3309
CALL
Gray Television
GTN
$409M
| $15K | ﹤0.01% |
336
-4
| -1% | -$39 |
|
3310
PUT
Infosys
INFY
$47.4B
| $15K | ﹤0.01% |
976
-1,052
| -52% | -$7.9K |
|
3311
PUT
Lennox International
LII
$19B
| $15K | ﹤0.01% |
+125
| New | +$19.1K |
|
3312
PUT
Lumentum
LITE
$55.4B
| $15K | ﹤0.01% |
80
-22
| -22% | -$875 |
|
3313
CALL
ManpowerGroup
MAN
$2.5B
| $15K | ﹤0.01% |
22
-14
| -39% | -$1.15K |
|
3314
PUT
Nelnet
NNI
$4.81B
| $15K | ﹤0.01% |
62
| – | – |
|
3315
CALL
Enpro
NPO
$6.95B
| $15K | ﹤0.01% |
+58
| New | +$3.49K |
|
3316
CALL
Newell Brands
NWL
$2.2B
| $15K | ﹤0.01% |
606
+27
| +5% | +$1.31K |
|
3317
Otter Tail
OTTR
$3.87B
| $15K | ﹤0.01% |
392
-211
| -35% | -$7.84K |
|
3318
PUT
PNC Financial Services
PNC
$99.6B
| $15K | ﹤0.01% |
440
-98
| -18% | -$10.2K |
|
3319
PUT
Plus Therapeutics
PSTV
$25.7M
| – | – |
0
| – | – |
|
3320
uniQure
QURE
$2.63B
| $15K | ﹤0.01% |
2,686
+1,577
| +142% | +$10.6K |
|
3321
CALL
ALPS REIT Dividend Dogs ETF
RDOG
$11.6M
| $15K | ﹤0.01% |
346
-236
| -41% | -$9.87K |
|
3322
CALL
Robert Half
RHI
$4.07B
| $15K | ﹤0.01% |
30
-189
| -86% | -$8.1K |
|
3323
CALL
Shake Shack
SHAK
$2.48B
| $15K | ﹤0.01% |
212
+116
| +121% | +$4.07K |
|
3324
Amplify Junior Silver Miners ETF
SILJ
$3.29B
| $15K | ﹤0.01% |
1,252
-3,616
| -74% | -$48K |
|
3325
PUT
Sony
SONY
$131B
| $15K | ﹤0.01% |
995
-195
| -16% | -$1.19K |
|
Similar funds
Simplex Trading's Q4 2016 Portfolio in Review
As of Q4 2016, Simplex Trading held 7,301 positions worth $1.67B, up 13% from $1.48B the previous quarter. Its ten largest holdings account for 20% of the portfolio.
Simplex Trading deployed $181M of net new capital in Q4 2016, opening 1,543 new positions and adding to 2,137 existing holdings. Its largest new stake was State Street SPDR S&P 500 ETF Trust: 227,870 shares worth $50.9M.
By sector, the portfolio is most concentrated in Communication Services at 8.8% of assets, up from 8.4% a quarter earlier, followed by Technology and Healthcare.
On the sell side, the largest reduction was Goldman Sachs, an estimated $8.5M trimmed.
- Simplex Trading's largest Q4 2016 buy was State Street SPDR S&P 500 ETF Trust: 227,870 shares worth $50.9M.
- Simplex Trading added most to Apple in Q4 2016, an estimated $24.5M increase.
- Simplex Trading's biggest Q4 2016 reduction was Goldman Sachs, cutting an estimated $8.5M.
- Simplex Trading fully exited LinkedIn Corporation in Q4 2016, selling an estimated $17.4M.
- Simplex Trading's ten largest holdings make up 20% of its $1.67B portfolio in Q4 2016.
- Simplex Trading opened 1,543 new positions and closed 1,480 in Q4 2016.
- Simplex Trading's portfolio value rose 13% quarter-over-quarter to $1.67B.
Based on Simplex Trading's 13F filing for Q4 2016, filed 11 Jan 2017.