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 | |
|---|---|---|---|---|---|---|
3551
Warrior Met Coal
HCC
$4.17B
| $135K | ﹤0.01% |
+5,626
| New | +$144K |
|
3552
PUT
MiMedx Group
MDXG
$660M
| $135K | ﹤0.01% |
759
-1,155
| -60% | -$6.41K |
|
|
SA
3553
Seabridge Gold
SA
$2.69B
| $135K | ﹤0.01% |
+10,238
| New | +$129K |
|
3554
Columbia Sportswear
COLM
$3.31B
| $134K | ﹤0.01% |
+1,600
| New | +$142K |
|
|
VISN
3555
PUT
Vistance Networks Inc
VISN
$2.62B
| $134K | ﹤0.01% |
82
+15
| +22% | +$318 |
|
3556
CALL
Healthpeak Properties
DOC
$15.8B
| $134K | ﹤0.01% |
48
| – | – |
|
3557
PUT
GrafTech
EAF
$198M
| $134K | ﹤0.01% |
12
| – | – |
|
3558
PUT
Mercury Insurance
MCY
$6.07B
| $134K | ﹤0.01% |
26
+22
| +550% | +$1.2K |
|
3559
E.W. Scripps
SSP
$278M
| $134K | ﹤0.01% |
8,570
-16,667
| -66% | -$278K |
|
|
VRN
3560
PUT
DELISTED
Veren
VRN
| $134K | ﹤0.01% |
447
+15
| +3% | +$64 |
|
3561
CALL
EyePoint Inc
EYPT
$1B
| $133K | ﹤0.01% |
71
+24
| +51% | +$581 |
|
3562
Hilltop Holdings
HTH
$2.27B
| $133K | ﹤0.01% |
7,514
+6,487
| +632% | +$123K |
|
3563
PUT
Karyopharm Therapeutics
KPTI
$158M
| $133K | ﹤0.01% |
10
+5
| +100% | +$843 |
|
3564
Lloyds Banking Group
LYG
$87.1B
| $133K | ﹤0.01% |
52,300
+47,414
| +970% | +$135K |
|
|
3565
PUT
Lloyds Banking Group
LYG
$87.1B
| $133K | ﹤0.01% |
+523
| New | +$1.49K |
|
3566
CALL
Murphy Oil
MUR
$5.25B
| $133K | ﹤0.01% |
57
-146
| -72% | -$4.47K |
|
3567
Gibraltar Industries
ROCK
$1.4B
| $133K | ﹤0.01% |
3,764
-1,613
| -30% | -$58.8K |
|
|
DOOR
3568
DELISTED
MASONITE INTERNATIONAL CORP
DOOR
| $133K | ﹤0.01% |
+2,972
| New | +$161K |
|
|
TGP
3569
PUT
DELISTED
Teekay LNG Partners L.P.
TGP
| $133K | ﹤0.01% |
121
+84
| +227% | +$1.18K |
|
3570
CALL
American Coastal Insurance
ACIC
$529M
| $132K | ﹤0.01% |
80
+51
| +176% | +$970 |
|
3571
Quest Diagnostics
DGX
$26B
| $132K | ﹤0.01% |
+1,593
| New | +$149K |
|
3572
PUT
Kforce
KFRC
$1.04B
| $132K | ﹤0.01% |
43
+41
| +2,050% | +$1.32K |
|
3573
CALL
Lattice Semiconductor
LSCC
$16.2B
| $132K | ﹤0.01% |
192
+117
| +156% | +$788 |
|
3574
MaxLinear
MXL
$5.34B
| $132K | ﹤0.01% |
7,510
-20,023
| -73% | -$367K |
|
3575
CALL
Shenandoah Telecom
SHEN
$671M
| $132K | ﹤0.01% |
30
-180
| -86% | -$7.68K |
|
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.