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 | |
|---|---|---|---|---|---|---|
3901
PUT
Flywire
FLYW
$2.04B
| $412K | ﹤0.01% |
17,800
+2,100
| +13% | +$53K |
|
3902
CALL
Invesco CurrencyShares Swiss Franc Trust
FXF
$409M
| $412K | ﹤0.01% |
3,900
+3,400
| +680% | +$341K |
|
3903
CALL
NuScale Power
SMR
$2.84B
| $412K | ﹤0.01% |
125,400
+33,100
| +36% | +$118K |
|
3904
CALL
Varonis Systems
VRNS
$5.13B
| $412K | ﹤0.01% |
9,100
+1,600
| +21% | +$60.2K |
|
|
MTTR
3905
DELISTED
Matterport, Inc. Class A Common Stock
MTTR
| $412K | ﹤0.01% |
153,333
+53,992
| +54% | +$130K |
|
|
CMRC
3906
CALL
Commerce.com Inc Series 1
CMRC
$264M
| $411K | ﹤0.01% |
42,300
-6,000
| -12% | -$55.8K |
|
3907
Global X Cybersecurity ETF
BUG
$1.26B
| $411K | ﹤0.01% |
14,047
+11,119
| +380% | +$287K |
|
|
NXDR
3908
CALL
Nextdoor Holdings
NXDR
$877M
| $411K | ﹤0.01% |
217,500
+171,200
| +370% | +$302K |
|
3909
PUT
Howard Hughes
HHH
$4B
| $410K | ﹤0.01% |
5,035
-2,728
| -35% | -$191K |
|
3910
PUT
Magnite
MGNI
$2.82B
| $410K | ﹤0.01% |
44,000
+4,000
| +10% | +$31.6K |
|
3911
PUT
Walker & Dunlop
WD
$1.75B
| $410K | ﹤0.01% |
3,700
+3,000
| +429% | +$246K |
|
3912
CALL
Acuity Brands
AYI
$10.3B
| $409K | ﹤0.01% |
2,000
-1,200
| -38% | -$217K |
|
3913
Atlanta Braves Holdings Series B
BATRK
$3.27B
| $409K | ﹤0.01% |
10,344
+9,349
| +940% | +$341K |
|
3914
CALL
Rogers Corp
ROG
$2.13B
| $409K | ﹤0.01% |
3,100
+3,000
| +3,000% | +$384K |
|
3915
PUT
NiSource
NI
$21.9B
| $408K | ﹤0.01% |
15,400
+10,500
| +214% | +$270K |
|
3916
CALL
Safe Bulkers
SB
$761M
| $408K | ﹤0.01% |
103,900
+42,000
| +68% | +$148K |
|
|
BLUE
3917
CALL
DELISTED
bluebird bio
BLUE
| $407K | ﹤0.01% |
14,945
+8,060
| +117% | +$491K |
|
|
MFA
3918
MFA Financial
MFA
$935M
| $407K | ﹤0.01% |
+36,169
| New | +$366K |
|
3919
Direxion Daily Real Estate Bull 3X ETF
DRN
$48.6M
| $406K | ﹤0.01% |
+38,230
| New | +$300K |
|
3920
CALL
Valvoline
VVV
$5.13B
| $405K | ﹤0.01% |
10,800
+9,300
| +620% | +$311K |
|
3921
CALL
Assured Guaranty
AGO
$3.79B
| $404K | ﹤0.01% |
5,400
-13,300
| -71% | -$879K |
|
3922
CALL
Cemex
CX
$17.3B
| $404K | ﹤0.01% |
52,200
-9,500
| -15% | -$64.6K |
|
3923
PUT
Honda
HMC
$39.3B
| $404K | ﹤0.01% |
13,100
+5,700
| +77% | +$180K |
|
3924
Zai Lab
ZLAB
$2.1B
| $404K | ﹤0.01% |
14,793
-1,483
| -9% | -$39.1K |
|
3925
CALL
Azenta
AZTA
$1.33B
| $403K | ﹤0.01% |
6,200
-2,700
| -30% | -$146K |
|
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.