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 | |
|---|---|---|---|---|---|---|
651
PUT
LyondellBasell Industries
LYB
$20.1B
| $321K | 0.02% |
356
+43
| +14% | +$3.82K |
|
652
CALL
PayPal
PYPL
$49B
| $321K | 0.02% |
+2,157
| New | +$77.3K |
|
653
Akebia Therapeutics
AKBA
$338M
| $320K | 0.02% |
+33,148
| New | +$304K |
|
|
MRSH
654
Marsh
MRSH
$84B
| $320K | 0.02% |
6,142
+6,019
| +4,893% | +$336K |
|
655
PUT
Stratasys
SSYS
$713M
| $320K | 0.02% |
151
-63
| -29% | -$1.95K |
|
656
Alaunos Therapeutics
TCRT
$4.76M
| $320K | 0.02% |
237
+199
| +524% | +$328K |
|
|
BRCM
657
PUT
DELISTED
BROADCOM CORP CL-A
BRCM
| $320K | 0.02% |
691
-395
| -36% | -$20.3K |
|
|
SAFM
658
DELISTED
Sanderson Farms Inc
SAFM
| $318K | 0.02% |
+4,642
| New | +$325K |
|
|
SNDK
659
CALL
DELISTED
SANDISK CORP
SNDK
| $318K | 0.02% |
1,911
+1,083
| +131% | +$59.8K |
|
660
Devon Energy
DVN
$51.8B
| $317K | 0.02% |
8,562
-3,450
| -29% | -$158K |
|
661
Kimco Realty
KIM
$17.6B
| $317K | 0.02% |
+13,003
| New | +$312K |
|
662
PUT
Canadian Solar
CSIQ
$1.05B
| $316K | 0.02% |
606
+395
| +187% | +$8.78K |
|
|
THS
663
DELISTED
Treehouse Foods
THS
| $315K | 0.02% |
+4,053
| New | +$325K |
|
|
WIRE
664
DELISTED
Encore Wire Corp
WIRE
| $315K | 0.02% |
9,647
+7,186
| +292% | +$255K |
|
665
CALL
Humana
HUM
$47.7B
| $314K | 0.02% |
351
-1,412
| -80% | -$261K |
|
666
CALL
Acadia Pharmaceuticals
ACAD
$4.27B
| $312K | 0.02% |
290
+102
| +54% | +$4.24K |
|
667
Expeditors International
EXPD
$23.2B
| $312K | 0.02% |
+6,636
| New | +$314K |
|
668
CALL
Chevron
CVX
$384B
| $311K | 0.02% |
2,785
+1,774
| +175% | +$149K |
|
669
Stanley Black & Decker
SWK
$13.9B
| $311K | 0.02% |
3,209
+551
| +21% | +$56.7K |
|
670
CALL
Accenture
ACN
$85.7B
| $310K | 0.02% |
310
+19
| +7% | +$1.89K |
|
671
Novavax
NVAX
$1.3B
| $310K | 0.02% |
2,196
+1,033
| +89% | +$232K |
|
672
Robert Half
RHI
$4.16B
| $310K | 0.02% |
+6,069
| New | +$327K |
|
673
PUT
Trip.com Group
TCOM
$26.8B
| $309K | 0.02% |
2,278
+2,014
| +763% | +$70K |
|
|
JOYY
674
PUT
JOYY Inc
JOYY
$3.65B
| $309K | 0.02% |
497
+117
| +31% | +$6.75K |
|
|
CBI
675
CALL
DELISTED
Chicago Bridge & Iron Nv
CBI
| $309K | 0.02% |
1,432
+651
| +83% | +$30.1K |
|
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.