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 | |
|---|---|---|---|---|---|---|
|
GRFS
6876
Grifois
GRFS
$5.42B
| $21K | ﹤0.01% |
1,847
-28,653
| -94% | -$267K |
|
6877
Werewolf Therapeutics
HOWL
$21.4M
| $21K | ﹤0.01% |
5,698
-257
| -4% | -$656 |
|
6878
CALL
Hawkins
HWKN
$2.96B
| $21K | ﹤0.01% |
300
+100
| +50% | +$6.22K |
|
6879
CALL
IDEX
IEX
$16.6B
| $21K | ﹤0.01% |
100
| – | – |
|
6880
CALL
LiveOne
LVO
$64.3M
| $21K | ﹤0.01% |
2,320
+1,500
| +183% | +$15.9K |
|
6881
PUT
LSB Industries
LXU
$833M
| $21K | ﹤0.01% |
2,300
-4,600
| -67% | -$42K |
|
6882
PUT
Merchants Bancorp
MBIN
$2.24B
| $21K | ﹤0.01% |
500
| – | – |
|
6883
PUT
MillerKnoll
MLKN
$1.6B
| $21K | ﹤0.01% |
800
-12,900
| -94% | -$329K |
|
|
NB
6884
NioCorp Developments
NB
$571M
| $21K | ﹤0.01% |
6,830
+5,776
| +548% | +$20.9K |
|
6885
Neonode
NEON
$12.9M
| $21K | ﹤0.01% |
9,178
+1,078
| +13% | +$1.58K |
|
6886
PUT
NextDecade
NEXT
$1.64B
| $21K | ﹤0.01% |
4,500
+1,300
| +41% | +$6.05K |
|
|
NFGC
6887
CALL
New Found Gold
NFGC
$534M
| $21K | ﹤0.01% |
+6,100
| New | +$23.1K |
|
6888
CALL
Nu Skin
NUS
$257M
| $21K | ﹤0.01% |
1,100
+900
| +450% | +$16.6K |
|
|
OLO
6889
DELISTED
Olo Inc
OLO
| $21K | ﹤0.01% |
3,766
-5,145
| -58% | -$28.3K |
|
6890
PUT
Offerpad Solutions
OPAD
$19.9M
| $21K | ﹤0.01% |
580
+90
| +18% | +$8.17K |
|
6891
OPAL Fuels
OPAL
$68.3M
| $21K | ﹤0.01% |
3,915
+2,212
| +130% | +$13.7K |
|
6892
PUT
Patria Investments
PAX
$1.76B
| $21K | ﹤0.01% |
1,400
-600
| -30% | -$8.51K |
|
|
PKST
6893
CALL
DELISTED
Peakstone Realty Trust
PKST
| $21K | ﹤0.01% |
1,100
+300
| +38% | +$4.89K |
|
|
BCIC
6894
CALL
BCP Investment Corp
BCIC
$88.1M
| $21K | ﹤0.01% |
1,200
+1,000
| +500% | +$17.5K |
|
|
SHOE
6895
PUT
Shoe Station Group
SHOE
$424M
| $21K | ﹤0.01% |
700
+600
| +600% | +$15.1K |
|
6896
PUT
SurgePays
SURG
$5.92M
| $21K | ﹤0.01% |
3,300
-1,400
| -30% | -$7.45K |
|
6897
Transmedics
TMDX
$2.57B
| $21K | ﹤0.01% |
267
-3,785
| -93% | -$228K |
|
6898
Tenaya Therapeutics
TNYA
$161M
| $21K | ﹤0.01% |
6,743
+6,279
| +1,353% | +$13.6K |
|
6899
CALL
Telesat
TSAT
$544M
| $21K | ﹤0.01% |
2,100
-14,700
| -88% | -$164K |
|
6900
CALL
Verrica Pharmaceuticals
VRCA
$96.7M
| $21K | ﹤0.01% |
290
-10
| -3% | -$411 |
|
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.