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 | |
|---|---|---|---|---|---|---|
|
JWN
5251
DELISTED
Nordstrom
JWN
| $113K | ﹤0.01% |
6,141
-25,058
| -80% | -$385K |
|
5252
PUT
RXO
RXO
$3.34B
| $113K | ﹤0.01% |
4,900
-25,600
| -84% | -$515K |
|
5253
CALL
STAG Industrial
STAG
$7.38B
| $113K | ﹤0.01% |
2,900
-8,500
| -75% | -$302K |
|
|
BLD
5254
PUT
DELISTED
TopBuild
BLD
| $112K | ﹤0.01% |
300
-400
| -57% | -$115K |
|
5255
PUT
Dana Inc
DAN
$2.9B
| $112K | ﹤0.01% |
7,700
+5,500
| +250% | +$73K |
|
5256
PUT
Extra Space Storage
EXR
$31.3B
| $112K | ﹤0.01% |
700
-1,300
| -65% | -$165K |
|
5257
PUT
Fidelity National Financial
FNF
$13.9B
| $112K | ﹤0.01% |
2,200
-5,300
| -71% | -$231K |
|
5258
CALL
Genesco
GCO
$425M
| $112K | ﹤0.01% |
3,200
-2,100
| -40% | -$64.6K |
|
5259
PUT
Hudbay
HBM
$10.1B
| $112K | ﹤0.01% |
20,400
-22,600
| -53% | -$106K |
|
5260
CALL
Global X MSCI Norway ETF
NORW
$88M
| $112K | ﹤0.01% |
3,900
-5,000
| -56% | -$121K |
|
|
SUPV
5261
Grupo Supervielle
SUPV
$828M
| $112K | ﹤0.01% |
+27,748
| New | +$75.7K |
|
5262
PUT
Upbound Group
UPBD
$1.13B
| $112K | ﹤0.01% |
3,300
+3,200
| +3,200% | +$95.3K |
|
|
AY
5263
DELISTED
Atlantica Sustainable Infrastructure plc Ordinary Shares
AY
| $112K | ﹤0.01% |
5,229
-12,825
| -71% | -$244K |
|
|
GMDA
5264
CALL
DELISTED
Gamida Cell Ltd. Ordinary Shares
GMDA
| $112K | ﹤0.01% |
271,400
+258,500
| +2,004% | +$146K |
|
5265
PUT
Braze
BRZE
$2.81B
| $111K | ﹤0.01% |
2,100
+1,400
| +200% | +$69.2K |
|
5266
PUT
Cabaletta Bio
CABA
$437M
| $111K | ﹤0.01% |
4,900
+2,500
| +104% | +$42K |
|
|
DNB
5267
CALL
DELISTED
Dun & Bradstreet
DNB
| $111K | ﹤0.01% |
9,500
+2,200
| +30% | +$22.4K |
|
5268
CALL
EnerSys
ENS
$6.78B
| $111K | ﹤0.01% |
1,100
-3,300
| -75% | -$303K |
|
|
TDAY
5269
USA Today Co
TDAY
$1.27B
| $111K | ﹤0.01% |
48,520
+10,556
| +28% | +$23.5K |
|
5270
CALL
Newegg Commerce
NEGG
$279M
| $111K | ﹤0.01% |
4,415
-4,875
| -52% | -$88.5K |
|
5271
CALL
NerdWallet
NRDS
$592M
| $111K | ﹤0.01% |
7,600
+100
| +1% | +$1.1K |
|
|
OPRA
5272
PUT
Opera Ltd
OPRA
$1.69B
| $111K | ﹤0.01% |
8,400
-6,100
| -42% | -$72.1K |
|
5273
CALL
Webster Financial
WBS
$12.5B
| $111K | ﹤0.01% |
2,200
+700
| +47% | +$30.3K |
|
5274
PUT
West Fraser Timber
WFG
$5.08B
| $111K | ﹤0.01% |
1,300
+1,100
| +550% | +$81.4K |
|
|
SBDS
5275
CALL
DELISTED
Solo Brands Inc
SBDS
| $111K | ﹤0.01% |
453
-100
| -18% | -$19.5K |
|
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.