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 | |
|---|---|---|---|---|---|---|
1301
CALL
Corcept Therapeutics
CORT
$10.3B
| $7.31M | ﹤0.01% |
225,200
+209,100
| +1,299% | +$5.74M |
|
|
SWAV
1302
CALL
DELISTED
Shockwave Medical, Inc. Common Stock
SWAV
| $7.3M | ﹤0.01% |
38,300
+6,600
| +21% | +$1.25M |
|
1303
CALL
Penumbra
PEN
$12.5B
| $7.29M | ﹤0.01% |
29,000
-2,000
| -6% | -$442K |
|
1304
CALL
CoStar Group
CSGP
$11.3B
| $7.26M | ﹤0.01% |
83,100
+75,100
| +939% | +$6.08M |
|
1305
CALL
CDW
CDW
$16.9B
| $7.25M | ﹤0.01% |
31,900
+19,000
| +147% | +$4.03M |
|
1306
CALL
Carlisle Companies
CSL
$13.6B
| $7.25M | ﹤0.01% |
23,200
+9,400
| +68% | +$2.59M |
|
1307
Snap
SNAP
$7.39B
| $7.24M | ﹤0.01% |
427,917
-168,886
| -28% | -$2.07M |
|
1308
Halliburton
HAL
$27.9B
| $7.22M | ﹤0.01% |
199,746
-40,056
| -17% | -$1.54M |
|
1309
CALL
O'Reilly Automotive
ORLY
$71.9B
| $7.22M | ﹤0.01% |
114,000
+15,000
| +15% | +$948K |
|
1310
PUT
Public Service Enterprise Group
PEG
$40.1B
| $7.21M | ﹤0.01% |
118,000
+110,200
| +1,413% | +$6.77M |
|
|
CTRA
1311
PUT
DELISTED
Coterra Energy
CTRA
| $7.21M | ﹤0.01% |
282,600
+228,800
| +425% | +$6.13M |
|
1312
CALL
Steris
STE
$20.7B
| $7.21M | ﹤0.01% |
32,800
+24,300
| +286% | +$5.14M |
|
1313
CALL
Vanguard Short-Term Treasury ETF
VGSH
$29.3B
| $7.21M | ﹤0.01% |
105,300
+23,400
| +29% | +$1.35M |
|
1314
CALL
Jones Lang LaSalle
JLL
$15B
| $7.18M | ﹤0.01% |
38,000
+25,800
| +211% | +$3.9M |
|
1315
United States Oil Fund
USO
$2.45B
| $7.17M | ﹤0.01% |
107,529
+92,446
| +613% | +$6.7M |
|
1316
CALL
Iron Mountain
IRM
$38.9B
| $7.16M | ﹤0.01% |
102,300
+28,600
| +39% | +$1.79M |
|
1317
PUT
Vistra
VST
$56.7B
| $7.15M | ﹤0.01% |
185,700
-4,400
| -2% | -$153K |
|
1318
CALL
Allstate
ALL
$66.3B
| $7.15M | ﹤0.01% |
51,100
-84,000
| -62% | -$11M |
|
1319
PUT
CleanSpark
CLSK
$3.85B
| $7.14M | ﹤0.01% |
647,000
+471,500
| +269% | +$2.94M |
|
1320
CME Group
CME
$91.1B
| $7.12M | ﹤0.01% |
33,797
+25,584
| +312% | +$5.46M |
|
1321
PUT
Nu Holdings
NU
$68.3B
| $7.12M | ﹤0.01% |
854,500
-59,400
| -6% | -$480K |
|
1322
PUT
M&T Bank
MTB
$35.8B
| $7.11M | ﹤0.01% |
51,900
-25,300
| -33% | -$3.18M |
|
1323
Progressive
PGR
$123B
| $7.11M | ﹤0.01% |
44,641
+5,260
| +13% | +$824K |
|
1324
BILL Holdings
BILL
$4.21B
| $7.09M | ﹤0.01% |
+86,916
| New | +$7.14M |
|
1325
CALL
Welltower
WELL
$177B
| $7.08M | ﹤0.01% |
78,500
+200
| +0.3% | +$17.4K |
|
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.