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
|
+$29.8M |
| 2 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$17.1M |
| 3 |
Walt Disney
DIS
|
+$14.8M |
| 4 |
Gilead Sciences
GILD
|
+$11.8M |
| 5 |
iShares MSCI Emerging Markets ETF
EEM
|
+$11.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Alphabet (Google) Class C
GOOG
|
+$92.9M |
| 2 |
Apple
AAPL
|
+$22.5M |
| 3 |
Meta Platforms (Facebook)
META
|
+$20.5M |
| 4 |
IBM
IBM
|
+$12.7M |
| 5 |
Baidu
BIDU
|
+$10M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Healthcare | 6.46% |
| 2 | Communication Services | 4.66% |
| 3 | Consumer Discretionary | 4.6% |
| 4 | Technology | 4.57% |
| 5 | Financials | 4.49% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
626
CALL
VanEck Gold Miners ETF
GDX
$23.4B
| $331K | 0.02% |
4,474
+3,403
| +318% | +$49.1K |
|
627
iShares S&P 100 ETF
OEF
$20.1B
| $331K | 0.02% |
3,916
+2,490
| +175% | +$223K |
|
|
QEP
628
DELISTED
QEP RESOURCES, INC.
QEP
| $331K | 0.02% |
26,433
+19,588
| +286% | +$270K |
|
|
VIAB
629
PUT
DELISTED
Viacom Inc. Class B
VIAB
| $331K | 0.02% |
765
+675
| +750% | +$33.4K |
|
|
KSU
630
DELISTED
Kansas City Southern
KSU
| $330K | 0.02% |
3,637
+786
| +28% | +$74.2K |
|
631
iShares China Large-Cap ETF
FXI
$4.29B
| $329K | 0.02% |
9,281
-55,116
| -86% | -$2.14M |
|
632
PUT
Novavax
NVAX
$1.3B
| $329K | 0.02% |
57
+40
| +235% | +$8.97K |
|
633
Vertex Pharmaceuticals
VRTX
$120B
| $329K | 0.02% |
3,163
-330
| -9% | -$42.4K |
|
|
BID
634
DELISTED
Sotheby's
BID
| $328K | 0.02% |
+10,281
| New | +$394K |
|
635
Sherwin-Williams
SHW
$78.9B
| $327K | 0.02% |
4,404
-417
| -9% | -$36.6K |
|
|
SWIR
636
DELISTED
Sierra Wireless
SWIR
| $327K | 0.02% |
15,499
+15,299
| +7,650% | +$354K |
|
637
PUT
BioMarin Pharmaceuticals
BMRN
$11.3B
| $326K | 0.02% |
134
+1
| +0.8% | +$134 |
|
638
iShares MSCI South Africa ETF
EZA
$542M
| $326K | 0.02% |
6,077
+5,327
| +710% | +$314K |
|
|
639
CALL
IBM
IBM
$193B
| $326K | 0.02% |
2,031
+54
| +3% | +$7.97K |
|
640
W.R. Berkley
WRB
$26.8B
| $326K | 0.02% |
+20,280
| New | +$332K |
|
641
PUT
Vodafone
VOD
$35.7B
| $325K | 0.02% |
460
+329
| +251% | +$11.7K |
|
642
PUT
Yum! Brands
YUM
$40.7B
| $325K | 0.02% |
2,334
+1,726
| +284% | +$104K |
|
643
Idexx Laboratories
IDXX
$43B
| $324K | 0.02% |
+4,368
| New | +$313K |
|
644
PUT
McDonald's
MCD
$187B
| $324K | 0.02% |
1,416
+473
| +50% | +$46.1K |
|
645
PUT
The Mosaic Company
MOS
$7.24B
| $323K | 0.02% |
500
+411
| +462% | +$17K |
|
646
PUT
Rio Tinto
RIO
$150B
| $323K | 0.02% |
442
-395
| -47% | -$14.8K |
|
647
PUT
Devon Energy
DVN
$51.8B
| $322K | 0.02% |
278
-14
| -5% | -$642 |
|
648
CALL
EOG Resources
EOG
$76.7B
| $322K | 0.02% |
2,599
+1,152
| +80% | +$89.5K |
|
649
CALL
GoPro
GPRO
$128M
| $322K | 0.02% |
4,925
+2,668
| +118% | +$131K |
|
650
SAP
SAP
$174B
| $322K | 0.02% |
+4,981
| New | +$344K |
|
Similar funds
Simplex Trading's Q3 2015 Portfolio in Review
As of Q3 2015, Simplex Trading held 7,014 positions worth $1.36B, up 14% from $1.19B the previous quarter. Its ten largest holdings account for 15% of the portfolio.
Simplex Trading's Q3 2015 filing shows 1,810 new, 2,203 increased, 1,391 reduced and 1,420 closed positions. Its largest new stake was iShares Russell 2000 ETF: 251,486 shares worth $27.5M. The largest sale was Alphabet (Google) Class C, an estimated $92.9M.
By sector, the portfolio is most concentrated in Healthcare at 6.5% of assets, down from 7.8% a quarter earlier, followed by Communication Services and Consumer Discretionary.
- Simplex Trading's largest Q3 2015 buy was iShares Russell 2000 ETF: 251,486 shares worth $27.5M.
- Simplex Trading added most to iShares MSCI Emerging Markets ETF in Q3 2015, an estimated $11.2M increase.
- Simplex Trading's biggest Q3 2015 reduction was Alphabet (Google) Class C, cutting an estimated $92.9M.
- Simplex Trading fully exited IBM in Q3 2015, selling an estimated $12.7M.
- Simplex Trading's ten largest holdings make up 15% of its $1.36B portfolio in Q3 2015.
- Simplex Trading opened 1,810 new positions and closed 1,420 in Q3 2015.
- Simplex Trading's portfolio value rose 14% quarter-over-quarter to $1.36B.
Based on Simplex Trading's 13F filing for Q3 2015, filed 8 Oct 2015.