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 |
Alibaba
BABA
|
+$120M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$93.9M |
| 3 |
Walt Disney
DIS
|
+$71.7M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$41.7M |
| 5 |
Citigroup
C
|
+$39.4M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$136M |
| 2 |
Amazon
AMZN
|
+$118M |
| 3 |
SPDR Gold Trust
GLD
|
+$56.2M |
| 4 |
Microsoft
MSFT
|
+$52.4M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$45.6M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.33% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Communication Services | 0.21% |
| 4 | Financials | 0.19% |
| 5 | Healthcare | 0.19% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
701
State Street Technology Select Sector SPDR ETF
XLK
$117B
| $21M | 0.01% |
218,614
+211,034
| +2,784% | +$18.8M |
|
702
CALL
Transocean
RIG
$5.87B
| $21M | 0.01% |
3,307,900
+733,000
| +28% | +$4.9M |
|
703
CALL
APA Corp
APA
$12.8B
| $21M | 0.01% |
584,300
-17,800
| -3% | -$672K |
|
704
CALL
AutoZone
AZO
$48.5B
| $20.9M | 0.01% |
8,100
-2,900
| -26% | -$7.52M |
|
705
PUT
Fortinet
FTNT
$114B
| $20.9M | 0.01% |
357,000
+89,800
| +34% | +$4.96M |
|
706
PUT
Deckers Outdoor
DECK
$14.2B
| $20.8M | 0.01% |
186,600
+132,000
| +242% | +$13.4M |
|
707
CALL
Synopsys
SNPS
$72.3B
| $20.7M | 0.01% |
40,200
+6,100
| +18% | +$3.12M |
|
708
CALL
Schwab US Broad Market ETF
SCHB
$43.3B
| $20.7M | 0.01% |
884,400
+307,200
| +53% | +$5.31M |
|
709
CALL
CF Industries
CF
$19.6B
| $20.7M | 0.01% |
260,200
+101,000
| +63% | +$8.04M |
|
710
PUT
Nucor
NUE
$53.7B
| $20.7M | 0.01% |
118,800
+7,200
| +6% | +$1.14M |
|
711
PUT
Petrobras
PBR
$122B
| $20.6M | 0.01% |
1,292,200
-412,600
| -24% | -$6.32M |
|
712
CALL
Invesco DB US Dollar Index Bullish Fund
UUP
$432M
| $20.5M | 0.01% |
951,300
-414,600
| -30% | -$12.1M |
|
713
PUT
American International
AIG
$41.5B
| $20.5M | 0.01% |
303,200
+37,700
| +14% | +$2.4M |
|
714
CALL
Edwards Lifesciences
EW
$48.6B
| $20.5M | 0.01% |
269,300
-83,700
| -24% | -$5.82M |
|
715
CALL
The Mosaic Company
MOS
$7.24B
| $20.5M | 0.01% |
573,800
-16,800
| -3% | -$593K |
|
|
PARA
716
CALL
DELISTED
Paramount Global Class B
PARA
| $20.5M | 0.01% |
1,383,800
+878,800
| +174% | +$11.8M |
|
717
TSMC
TSM
$2.18T
| $20.4M | 0.01% |
+196,626
| New | +$18.8M |
|
|
APLS
718
CALL
DELISTED
Apellis Pharmaceuticals
APLS
| $20.4M | 0.01% |
340,600
-178,600
| -34% | -$9.06M |
|
719
PUT
Vanguard ESG US Corporate Bond ETF
VCEB
$1.18B
| $20.4M | 0.01% |
103,600
+77,000
| +289% | +$4.65M |
|
|
720
SPDR Gold Trust
GLD
$133B
| $20.2M | 0.01% |
105,898
-306,498
| -74% | -$56.2M |
|
|
DFS
721
CALL
DELISTED
Discover Financial Services
DFS
| $20.2M | 0.01% |
179,800
-154,900
| -46% | -$14.3M |
|
|
TYNS
722
CALL
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $20.2M | 0.01% |
243,300
-100
| -0% | -$8.29K |
|
723
PUT
Lyft
LYFT
$5.57B
| $19.9M | 0.01% |
1,327,400
+500,100
| +60% | +$5.82M |
|
724
PUT
General Mills
GIS
$19.7B
| $19.8M | 0.01% |
304,000
+44,500
| +17% | +$2.87M |
|
725
CALL
iShares Gold Trust
IAU
$64.2B
| $19.8M | 0.01% |
507,000
+32,100
| +7% | +$1.2M |
|
Similar funds
Simplex Trading's Q4 2023 Portfolio in Review
As of Q4 2023, Simplex Trading held 10,333 positions worth $156B, up 23% from $127B the previous quarter. Its ten largest holdings account for 42% of the portfolio.
Simplex Trading deployed $15.1B of net new capital in Q4 2023, opening 1,639 new positions and adding to 3,920 existing holdings. Its largest new stake was Walt Disney: 812,984 shares worth $73.4M.
By sector, the portfolio is most concentrated in Technology at 0.33% of assets, down from 0.44% a quarter earlier, followed by Consumer Discretionary and Communication Services.
On the sell side, the largest reduction was iShares 20+ Year Treasury Bond ETF, an estimated $136M trimmed.
- Simplex Trading's largest Q4 2023 buy was Walt Disney: 812,984 shares worth $73.4M.
- Simplex Trading added most to Alibaba in Q4 2023, an estimated $120M increase.
- Simplex Trading's biggest Q4 2023 reduction was iShares 20+ Year Treasury Bond ETF, cutting an estimated $136M.
- Simplex Trading fully exited Amazon in Q4 2023, selling an estimated $118M.
- Simplex Trading's ten largest holdings make up 42% of its $156B portfolio in Q4 2023.
- Simplex Trading opened 1,639 new positions and closed 1,508 in Q4 2023.
- Simplex Trading's portfolio value rose 23% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q4 2023, filed 2 Feb 2024.