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 |
Invesco QQQ Trust
QQQ
|
+$86.9M |
| 2 |
Walt Disney
DIS
|
+$25.5M |
| 3 |
Baidu
BIDU
|
+$12.3M |
| 4 |
Alphabet (Google) Class A
GOOGL
|
+$12.3M |
| 5 |
RHT
Red Hat Inc
RHT
|
+$11.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Amazon
AMZN
|
+$66M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$60.3M |
| 3 |
Alphabet (Google) Class C
GOOG
|
+$33.9M |
| 4 |
Apple
AAPL
|
+$21.1M |
| 5 |
State Street Financial Select Sector SPDR ETF
XLF
|
+$18.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Communication Services | 0.58% |
| 2 | Technology | 0.42% |
| 3 | Healthcare | 0.34% |
| 4 | Consumer Discretionary | 0.29% |
| 5 | Industrials | 0.21% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
|
LTHM
2401
PUT
DELISTED
Livent Corporation
LTHM
| $644K | ﹤0.01% |
+525
| New | +$6.84K |
|
2402
PUT
Standard Motor Products
SMP
$861M
| $643K | ﹤0.01% |
131
+117
| +836% | +$5.78K |
|
2403
PUT
Paylocity
PCTY
$6.71B
| $642K | ﹤0.01% |
+72
| New | +$5.59K |
|
2404
PUT
Camping World
CWH
$363M
| $641K | ﹤0.01% |
461
+37
| +9% | +$518 |
|
2405
CALL
Nexstar Media Group
NXST
$5.6B
| $639K | ﹤0.01% |
59
-234
| -80% | -$21.6K |
|
2406
PUT
EPR Properties
EPR
$4.86B
| $638K | ﹤0.01% |
83
+56
| +207% | +$4.07K |
|
2407
PUT
Valvoline
VVV
$4.97B
| $638K | ﹤0.01% |
344
+342
| +17,100% | +$6.77K |
|
2408
PUT
Magna International
MGA
$17.9B
| $637K | ﹤0.01% |
131
+3
| +2% | +$151 |
|
2409
PUT
Eaton
ETN
$157B
| $636K | ﹤0.01% |
79
-99
| -56% | -$7.55K |
|
2410
Neurocrine Biosciences
NBIX
$17.7B
| $636K | ﹤0.01% |
+7,223
| New | +$604K |
|
2411
CALL
Goodyear
GT
$2.07B
| $635K | ﹤0.01% |
350
+227
| +185% | +$4.42K |
|
|
SGMO
2412
PUT
DELISTED
SANGAMO THERAPEUTICS INC
SGMO
| $635K | ﹤0.01% |
666
-65
| -9% | -$664 |
|
|
NSTG
2413
DELISTED
NanoString Technologies, Inc.
NSTG
| $635K | ﹤0.01% |
26,555
+15,615
| +143% | +$359K |
|
|
ENDP
2414
CALL
DELISTED
Endo International plc
ENDP
| $633K | ﹤0.01% |
789
+106
| +16% | +$997 |
|
|
PEGI
2415
PUT
DELISTED
Pattern Energy Group Inc. Class A
PEGI
| $633K | ﹤0.01% |
288
+280
| +3,500% | +$5.84K |
|
|
USG
2416
DELISTED
Usg
USG
| $631K | ﹤0.01% |
14,593
-14,650
| -50% | -$632K |
|
2417
CALL
Appian
APPN
$1.74B
| $630K | ﹤0.01% |
183
+66
| +56% | +$2.23K |
|
2418
PUT
Autohome
ATHM
$2.43B
| $630K | ﹤0.01% |
60
+19
| +46% | +$1.56K |
|
2419
PUT
Equitable Holdings
EQH
$13.1B
| $630K | ﹤0.01% |
313
+301
| +2,508% | +$5.75K |
|
2420
General Dynamics
GD
$105B
| $629K | ﹤0.01% |
+3,717
| New | +$626K |
|
2421
Regions Financial
RF
$26.3B
| $629K | ﹤0.01% |
44,502
+26,025
| +141% | +$399K |
|
2422
CALL
Aurinia Pharmaceuticals
AUPH
$1.97B
| $628K | ﹤0.01% |
967
+842
| +674% | +$5.59K |
|
2423
CALL
PTC Therapeutics
PTCT
$6.37B
| $628K | ﹤0.01% |
167
+114
| +215% | +$3.83K |
|
2424
CALL
Aldeyra Therapeutics
ALDX
$91.7M
| $626K | ﹤0.01% |
694
+690
| +17,250% | +$5.86K |
|
2425
CALL
ITT
ITT
$17.5B
| $626K | ﹤0.01% |
108
+60
| +125% | +$3.27K |
|
Similar funds
Simplex Trading's Q1 2019 Portfolio in Review
As of Q1 2019, Simplex Trading held 8,479 positions worth $36B, up 5.5% from $34.1B the previous quarter. Its ten largest holdings account for 35% of the portfolio.
Simplex Trading's Q1 2019 filing shows 1,472 new, 3,049 increased, 2,419 reduced and 1,324 closed positions. Its largest new stake was Walt Disney: 228,471 shares worth $25.4M. The largest sale was Amazon, an estimated $66M.
By sector, the portfolio is most concentrated in Communication Services at 0.58% of assets, up from 0.49% a quarter earlier, followed by Technology and Healthcare.
- Simplex Trading's largest Q1 2019 buy was Walt Disney: 228,471 shares worth $25.4M.
- Simplex Trading added most to Invesco QQQ Trust in Q1 2019, an estimated $86.9M increase.
- Simplex Trading's biggest Q1 2019 reduction was iShares Russell 2000 ETF, cutting an estimated $60.3M.
- Simplex Trading fully exited Amazon in Q1 2019, selling an estimated $66M.
- Simplex Trading's ten largest holdings make up 35% of its $36B portfolio in Q1 2019.
- Simplex Trading opened 1,472 new positions and closed 1,324 in Q1 2019.
- Simplex Trading's portfolio value rose 5.5% quarter-over-quarter to $36B.
Based on Simplex Trading's 13F filing for Q1 2019, filed 18 Apr 2019.