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 | |
|---|---|---|---|---|---|---|
1476
PUT
Invesco CurrencyShares Euro Currency Trust
FXE
$331M
| $5.46M | ﹤0.01% |
53,500
-5,500
| -9% | -$546K |
|
|
JWN
1477
CALL
DELISTED
Nordstrom
JWN
| $5.46M | ﹤0.01% |
295,700
+64,000
| +28% | +$982K |
|
1478
PUT
Blackstone Mortgage Trust
BXMT
$2.82B
| $5.45M | ﹤0.01% |
256,000
+31,300
| +14% | +$675K |
|
1479
Direxion Daily Energy Bull 2X ETF
ERX
$249M
| $5.43M | ﹤0.01% |
+95,964
| New | +$5.67M |
|
1480
Trane Technologies
TT
$106B
| $5.43M | ﹤0.01% |
22,259
+8,683
| +64% | +$1.9M |
|
|
WW
1481
CALL
DELISTED
WW International
WW
| $5.42M | ﹤0.01% |
619,800
+353,100
| +132% | +$3M |
|
1482
PUT
Symbotic
SYM
$5.11B
| $5.41M | ﹤0.01% |
105,400
-24,900
| -19% | -$1.09M |
|
1483
CALL
Regal Rexnord
RRX
$14.2B
| $5.4M | ﹤0.01% |
36,500
+36,400
| +36,400% | +$4.59M |
|
1484
Williams Companies
WMB
$90.5B
| $5.39M | ﹤0.01% |
+154,923
| New | +$5.44M |
|
1485
Toyota
TM
$210B
| $5.39M | ﹤0.01% |
+29,382
| New | +$5.36M |
|
1486
CALL
Textron
TXT
$16.6B
| $5.39M | ﹤0.01% |
67,000
+27,700
| +70% | +$2.15M |
|
1487
PUT
2x Long VIX Futures ETF
UVIX
$286M
| $5.38M | ﹤0.01% |
1,162
+1,034
| +808% | +$5.25M |
|
1488
CALL
Doximity
DOCS
$3.67B
| $5.38M | ﹤0.01% |
191,700
+113,200
| +144% | +$2.67M |
|
1489
CALL
GlobalFoundries
GFS
$29.4B
| $5.38M | ﹤0.01% |
88,700
+200
| +0.2% | +$11.1K |
|
1490
CALL
Starwood Property Trust
STWD
$6.12B
| $5.36M | ﹤0.01% |
255,000
+24,600
| +11% | +$483K |
|
1491
PENN Entertainment
PENN
$2.74B
| $5.36M | ﹤0.01% |
205,989
-31,730
| -13% | -$736K |
|
1492
CALL
Targa Resources
TRGP
$60.4B
| $5.36M | ﹤0.01% |
61,700
+27,100
| +78% | +$2.33M |
|
1493
CALL
Teledyne Technologies
TDY
$30.4B
| $5.36M | ﹤0.01% |
12,000
+6,900
| +135% | +$2.77M |
|
1494
PUT
Bloom Energy
BE
$52.6B
| $5.35M | ﹤0.01% |
361,300
+117,200
| +48% | +$1.47M |
|
1495
CALL
Shake Shack
SHAK
$2.3B
| $5.33M | ﹤0.01% |
71,900
+22,000
| +44% | +$1.35M |
|
1496
PUT
WEC Energy
WEC
$37.7B
| $5.33M | ﹤0.01% |
63,300
+31,200
| +97% | +$2.57M |
|
1497
CALL
Fastly Inc
FSLY
$3.17B
| $5.32M | ﹤0.01% |
298,800
-19,600
| -6% | -$331K |
|
1498
PUT
Equifax
EFX
$20.3B
| $5.32M | ﹤0.01% |
21,500
+3,100
| +17% | +$629K |
|
1499
PUT
Trip.com Group
TCOM
$27.5B
| $5.3M | ﹤0.01% |
147,200
+45,800
| +45% | +$1.56M |
|
1500
PUT
Immunovant
IMVT
$8.09B
| $5.29M | ﹤0.01% |
125,500
-361,300
| -74% | -$13.3M |
|
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.