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 | |
|---|---|---|---|---|---|---|
5626
PUT
Banco Santander
SAN
$202B
| $78K | ﹤0.01% |
18,900
-22,700
| -55% | -$88.8K |
|
5627
Global X Artificial Intelligence & Technology ETF
AIQ
$9.35B
| $77K | ﹤0.01% |
2,497
-3,269
| -57% | -$93.5K |
|
5628
CALL
ANI Pharmaceuticals
ANIP
$1.8B
| $77K | ﹤0.01% |
1,400
-2,900
| -67% | -$160K |
|
5629
PUT
Badger Meter
BMI
$3.89B
| $77K | ﹤0.01% |
500
-200
| -29% | -$29.1K |
|
|
BRDG
5630
PUT
DELISTED
Bridge Investment Group
BRDG
| $77K | ﹤0.01% |
7,900
+7,700
| +3,850% | +$62.4K |
|
5631
PUT
Clover Health Investments
CLOV
$2.2B
| $77K | ﹤0.01% |
81,800
-62,800
| -43% | -$61.7K |
|
|
CVAC
5632
PUT
DELISTED
CureVac
CVAC
| $77K | ﹤0.01% |
18,500
+1,400
| +8% | +$7.59K |
|
5633
CEL-SCI Corp
CVM
$20.3M
| $77K | ﹤0.01% |
950
+296
| +45% | +$18.4K |
|
5634
PUT
Enova International
ENVA
$6.33B
| $77K | ﹤0.01% |
1,400
+100
| +8% | +$4.62K |
|
5635
PUT
Great Southern Bancorp
GSBC
$874M
| $77K | ﹤0.01% |
+1,300
| New | +$68.1K |
|
5636
CALL
Immunome
IMNM
$2.58B
| $77K | ﹤0.01% |
7,200
-700
| -9% | -$5.82K |
|
5637
CALL
inTEST
INTT
$155M
| $77K | ﹤0.01% |
5,700
+2,700
| +90% | +$35.8K |
|
|
ORC
5638
PUT
Orchid Island Capital
ORC
$1.3B
| $77K | ﹤0.01% |
9,200
+2,800
| +44% | +$20.9K |
|
|
PTN
5639
Palatin Technologies
PTN
$13.7M
| $77K | ﹤0.01% |
390
+358
| +1,119% | +$39.6K |
|
5640
CALL
Richardson Electronics
RELL
$267M
| $77K | ﹤0.01% |
5,800
+4,700
| +427% | +$56.2K |
|
|
RPTX
5641
DELISTED
Repare Therapeutics
RPTX
| $77K | ﹤0.01% |
10,553
-8,745
| -45% | -$48.9K |
|
|
SVM
5642
Silvercorp Metals
SVM
$2.07B
| $77K | ﹤0.01% |
29,342
-4,669
| -14% | -$11.4K |
|
|
INFN
5643
CALL
DELISTED
Infinera Corporation Common Stock
INFN
| $77K | ﹤0.01% |
16,400
-139,500
| -89% | -$549K |
|
5644
Bioventus
BVS
$892M
| $76K | ﹤0.01% |
14,547
+6,319
| +77% | +$25K |
|
5645
CALL
Broadwind
BWEN
$93.6M
| $76K | ﹤0.01% |
27,600
-10,000
| -27% | -$26.4K |
|
5646
CALL
Immersion
IMMR
$251M
| $76K | ﹤0.01% |
10,900
-9,700
| -47% | -$64.5K |
|
5647
CALL
Inovio Pharmaceuticals
INO
$55.7M
| $76K | ﹤0.01% |
12,450
-592
| -5% | -$2.92K |
|
|
MTA
5648
PUT
Metalla Royalty & Streaming
MTA
$688M
| $76K | ﹤0.01% |
+24,800
| New | +$73.9K |
|
5649
Pliant Therapeutics
PLRX
$64.4M
| $76K | ﹤0.01% |
4,197
-21,409
| -84% | -$326K |
|
5650
CALL
Pacer Trendpilot US Large Cap ETF
PTLC
$3.26B
| $76K | ﹤0.01% |
1,500
-2,400
| -62% | -$98.8K |
|
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.