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 | |
|---|---|---|---|---|---|---|
3551
PUT
Green Brick Partners
GRBK
$3.12B
| $571K | ﹤0.01% |
11,000
+3,400
| +45% | +$155K |
|
3552
CALL
Credicorp
BAP
$31.1B
| $569K | ﹤0.01% |
3,800
+3,000
| +375% | +$389K |
|
3553
CALL
PagerDuty
PD
$753M
| $569K | ﹤0.01% |
24,600
+10,700
| +77% | +$232K |
|
|
TGI
3554
DELISTED
Triumph Group
TGI
| $569K | ﹤0.01% |
+34,367
| New | +$348K |
|
|
HAPN
3555
PUT
Happen Inc
HAPN
$2.16B
| $568K | ﹤0.01% |
65,100
-49,700
| -43% | -$312K |
|
3556
PUT
Companhia Siderúrgica Nacional
SID
$1.49B
| $568K | ﹤0.01% |
144,600
-98,700
| -41% | -$286K |
|
3557
CALL
Transmedics
TMDX
$2.57B
| $568K | ﹤0.01% |
7,200
-31,100
| -81% | -$1.88M |
|
3558
PUT
Tetra Tech
TTEK
$8.28B
| $567K | ﹤0.01% |
17,000
+11,500
| +209% | +$367K |
|
3559
CALL
iShares 0-5 Year Investment Grade Corporate Bond ETF
SLQD
$2.37B
| $566K | ﹤0.01% |
10,700
-2,200
| -17% | -$106K |
|
3560
EyePoint Inc
EYPT
$1.04B
| $565K | ﹤0.01% |
+24,450
| New | +$273K |
|
3561
CALL
FIGS
FIGS
$1.66B
| $565K | ﹤0.01% |
81,300
+51,000
| +168% | +$337K |
|
3562
O-I Glass
OI
$1.41B
| $564K | ﹤0.01% |
34,443
+33,913
| +6,399% | +$523K |
|
3563
CALL
New York Times
NYT
$11.7B
| $563K | ﹤0.01% |
11,500
-16,800
| -59% | -$741K |
|
3564
Direxion Daily S&P 500 Bear 3x ETF
SPXS
$348M
| $563K | ﹤0.01% |
4,879
-13,798
| -74% | -$1.96M |
|
|
FLNA
3565
PUT
Filana Therapeutics
FLNA
$43.5M
| $562K | ﹤0.01% |
135,100
+48,500
| +56% | +$1.02M |
|
3566
CALL
SharkNinja
SN
$21.7B
| $562K | ﹤0.01% |
+11,000
| New | +$503K |
|
3567
CALL
Amplify Energy
AMPY
$155M
| $561K | ﹤0.01% |
94,700
+22,200
| +31% | +$143K |
|
|
BLD
3568
CALL
DELISTED
TopBuild
BLD
| $561K | ﹤0.01% |
1,500
-13,300
| -90% | -$3.81M |
|
3569
PUT
NeoGenomics
NEO
$1.71B
| $561K | ﹤0.01% |
34,700
-28,900
| -45% | -$473K |
|
3570
Fabrinet
FN
$16.9B
| $560K | ﹤0.01% |
+2,944
| New | +$505K |
|
3571
Invesco QQQ Trust
QQQ
$449B
| $560K | ﹤0.01% |
+1,368
| New | +$519K |
|
3572
Deutsche Bank
DB
$67.9B
| $559K | ﹤0.01% |
+41,272
| New | +$486K |
|
3573
PUT
NerdWallet
NRDS
$613M
| $559K | ﹤0.01% |
38,000
+33,000
| +660% | +$364K |
|
3574
Alnylam Pharmaceuticals
ALNY
$37.2B
| $558K | ﹤0.01% |
2,916
-3,929
| -57% | -$669K |
|
3575
CALL
Arlo Technologies
ARLO
$1.51B
| $558K | ﹤0.01% |
58,700
+48,200
| +459% | +$440K |
|
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.