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 | |
|---|---|---|---|---|---|---|
3276
CALL
CNX Resources
CNX
$4.77B
| $768K | ﹤0.01% |
38,400
+13,700
| +55% | +$292K |
|
3277
CALL
Quaker Houghton
KWR
$2.63B
| $768K | ﹤0.01% |
3,600
+2,300
| +177% | +$396K |
|
3278
State Street Real Estate Select Sector SPDR ETF
XLRE
$8.69B
| $768K | ﹤0.01% |
+19,178
| New | +$689K |
|
3279
PUT
BJ's Restaurants
BJRI
$1.45B
| $767K | ﹤0.01% |
21,300
+20,200
| +1,836% | +$575K |
|
3280
CALL
Materion
MTRN
$5.03B
| $767K | ﹤0.01% |
5,900
+2,300
| +64% | +$252K |
|
3281
PUT
Medpace
MEDP
$16.5B
| $766K | ﹤0.01% |
+2,500
| New | +$675K |
|
3282
PUT
Post Holdings
POST
$4.14B
| $766K | ﹤0.01% |
8,700
-56,400
| -87% | -$4.79M |
|
3283
CALL
Prospect Capital
PSEC
$1.12B
| $766K | ﹤0.01% |
127,900
-87,400
| -41% | -$503K |
|
3284
CALL
Sweetgreen
SG
$733M
| $766K | ﹤0.01% |
67,800
+3,800
| +6% | +$40K |
|
|
SA
3285
PUT
Seabridge Gold
SA
$2.82B
| $764K | ﹤0.01% |
63,000
+17,600
| +39% | +$202K |
|
3286
Boise Cascade
BCC
$2.75B
| $763K | ﹤0.01% |
+5,904
| New | +$633K |
|
3287
PUT
Eastman Chemical
EMN
$7.74B
| $763K | ﹤0.01% |
8,500
+2,700
| +47% | +$215K |
|
3288
PUT
PagerDuty
PD
$753M
| $763K | ﹤0.01% |
33,000
+24,300
| +279% | +$526K |
|
3289
CALL
Brighthouse Financial
BHF
$3.63B
| $762K | ﹤0.01% |
14,400
+4,900
| +52% | +$243K |
|
3290
SiriusXM
SIRI
$10.5B
| $762K | ﹤0.01% |
+13,945
| New | +$670K |
|
3291
CALL
Sonos
SONO
$1.87B
| $762K | ﹤0.01% |
44,500
+14,700
| +49% | +$198K |
|
3292
CALL
US Foods
USFD
$21.9B
| $762K | ﹤0.01% |
16,800
-1,800
| -10% | -$74.4K |
|
3293
CALL
W.P. Carey
WPC
$17B
| $762K | ﹤0.01% |
167,600
-61,104
| -27% | -$3.52M |
|
3294
PUT
Viasat
VSAT
$10.2B
| $760K | ﹤0.01% |
27,200
+12,900
| +90% | +$270K |
|
|
AMPS
3295
CALL
DELISTED
Altus Power
AMPS
| $760K | ﹤0.01% |
111,300
+100,500
| +931% | +$544K |
|
|
OLK
3296
PUT
DELISTED
Olink Holding AB (publ) American Depositary Shares
OLK
| $759K | ﹤0.01% |
30,200
+7,300
| +32% | +$172K |
|
|
SP
3297
CALL
DELISTED
SP Plus Corporation
SP
| $758K | ﹤0.01% |
14,800
+5,500
| +59% | +$276K |
|
3298
CALL
Spectrum Brands
SPB
$2.04B
| $757K | ﹤0.01% |
9,500
-25,800
| -73% | -$1.94M |
|
3299
CALL
Bally's
BALY
$686M
| $756K | ﹤0.01% |
54,300
+26,200
| +93% | +$294K |
|
3300
PUT
Biomea Fusion
BMEA
$91.1M
| $756K | ﹤0.01% |
52,100
+14,800
| +40% | +$180K |
|
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.