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 | |
|---|---|---|---|---|---|---|
1551
Teck Resources
TECK
$29.5B
| $5.01M | ﹤0.01% |
+118,432
| New | +$4.55M |
|
1552
Zions Bancorporation
ZION
$10.1B
| $5M | ﹤0.01% |
114,089
+79,429
| +229% | +$2.87M |
|
1553
PUT
Inspire Medical Systems
INSP
$1.42B
| $5M | ﹤0.01% |
24,600
-14,800
| -38% | -$2.4M |
|
1554
PUT
FirstEnergy
FE
$28.9B
| $5M | ﹤0.01% |
136,400
-43,300
| -24% | -$1.57M |
|
|
MDC
1555
PUT
DELISTED
M.D.C. Holdings, Inc.
MDC
| $4.99M | ﹤0.01% |
90,300
+86,900
| +2,556% | +$3.85M |
|
|
SGI
1556
Somnigroup International
SGI
$15.1B
| $4.99M | ﹤0.01% |
97,818
+1,294
| +1% | +$54.9K |
|
1557
CALL
JPMorgan Inflation Managed Bond ETF
JCPI
$865M
| $4.97M | ﹤0.01% |
99,600
+46,100
| +86% | +$2.09M |
|
1558
CALL
PG&E
PCG
$47.8B
| $4.96M | ﹤0.01% |
275,400
-553,100
| -67% | -$9.34M |
|
1559
CALL
Bloom Energy
BE
$52.6B
| $4.96M | ﹤0.01% |
335,300
+101,800
| +44% | +$1.27M |
|
1560
CALL
PennyMac Financial
PFSI
$4.38B
| $4.96M | ﹤0.01% |
56,100
-25,700
| -31% | -$1.93M |
|
1561
PUT
Royalty Pharma
RPRX
$26.1B
| $4.93M | ﹤0.01% |
175,600
-7,000
| -4% | -$192K |
|
1562
CALL
BorgWarner
BWA
$13.2B
| $4.93M | ﹤0.01% |
138,300
+106,100
| +330% | +$3.79M |
|
1563
CALL
Raymond James Financial
RJF
$32.5B
| $4.93M | ﹤0.01% |
44,200
+27,100
| +158% | +$2.79M |
|
1564
Nutanix
NTNX
$14.9B
| $4.91M | ﹤0.01% |
+102,895
| New | +$4.16M |
|
1565
CALL
LyondellBasell Industries
LYB
$19.5B
| $4.9M | ﹤0.01% |
51,500
-62,000
| -55% | -$5.8M |
|
1566
CALL
Ciena
CIEN
$55.3B
| $4.89M | ﹤0.01% |
108,700
+46,100
| +74% | +$2.03M |
|
|
WBA
1567
DELISTED
Walgreens Boots Alliance
WBA
| $4.89M | ﹤0.01% |
187,375
+39,716
| +27% | +$888K |
|
1568
MasTec
MTZ
$26.7B
| $4.88M | ﹤0.01% |
64,523
+41,682
| +182% | +$2.61M |
|
1569
PUT
Coty
COTY
$2.33B
| $4.88M | ﹤0.01% |
393,300
-283,600
| -42% | -$3.06M |
|
1570
CALL
Cognex
CGNX
$10.3B
| $4.88M | ﹤0.01% |
116,900
+97,200
| +493% | +$3.73M |
|
1571
CALL
NOV
NOV
$7.45B
| $4.88M | ﹤0.01% |
240,500
+23,100
| +11% | +$454K |
|
1572
PUT
Pinnacle West Capital
PNW
$12.9B
| $4.87M | ﹤0.01% |
67,800
+36,000
| +113% | +$2.65M |
|
1573
Axos Financial
AX
$5.45B
| $4.86M | ﹤0.01% |
+88,943
| New | +$3.71M |
|
1574
CALL
Groupon
GRPN
$980M
| $4.86M | ﹤0.01% |
378,200
-5,300
| -1% | -$63.6K |
|
1575
CALL
TransDigm Group
TDG
$69.2B
| $4.86M | ﹤0.01% |
4,800
-3,400
| -41% | -$3.14M |
|
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.