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 | |
|---|---|---|---|---|---|---|
4676
CALL
Euronet Worldwide
EEFT
$3.19B
| $202K | ﹤0.01% |
2,000
-9,800
| -83% | -$836K |
|
|
SAND
4677
PUT
DELISTED
Sandstorm Gold
SAND
| $202K | ﹤0.01% |
40,300
-4,600
| -10% | -$21.9K |
|
4678
CALL
Vital Farms
VITL
$586M
| $202K | ﹤0.01% |
12,900
-2,300
| -15% | -$29.1K |
|
4679
FTI Consulting
FCN
$5.14B
| $201K | ﹤0.01% |
1,012
+944
| +1,388% | +$195K |
|
4680
PUT
Rexford Industrial Realty
REXR
$8.63B
| $201K | ﹤0.01% |
3,600
| – | – |
|
4681
CALL
Hallador Energy
HNRG
$646M
| $200K | ﹤0.01% |
+22,700
| New | +$286K |
|
4682
CALL
Host Hotels & Resorts
HST
$17.5B
| $200K | ﹤0.01% |
10,300
+100
| +1% | +$1.72K |
|
4683
CALL
Methode Electronics
MEI
$458M
| $200K | ﹤0.01% |
8,800
+8,500
| +2,833% | +$199K |
|
|
MOMO
4684
Hello Group
MOMO
$867M
| $200K | ﹤0.01% |
28,884
-9,997
| -26% | -$69.6K |
|
|
MRUS
4685
DELISTED
Merus
MRUS
| $200K | ﹤0.01% |
7,299
+6,558
| +885% | +$153K |
|
4686
ProShares UltraPro Short 20+ Year Treasury
TTT
$19M
| $200K | ﹤0.01% |
+3,292
| New | +$305K |
|
4687
Biohaven
BHVN
$2.02B
| $199K | ﹤0.01% |
4,654
+364
| +8% | +$11.3K |
|
4688
PUT
Clearway Energy Class C
CWEN
$4.79B
| $199K | ﹤0.01% |
7,300
+6,700
| +1,117% | +$156K |
|
4689
CALL
Gulfport Energy Corp
GPOR
$2.82B
| $199K | ﹤0.01% |
1,500
-14,200
| -90% | -$1.83M |
|
4690
PUT
Varonis Systems
VRNS
$4.67B
| $199K | ﹤0.01% |
4,400
-15,600
| -78% | -$587K |
|
4691
VSE Corp
VSEC
$5.19B
| $199K | ﹤0.01% |
+3,091
| New | +$181K |
|
4692
iPath Series B S&P 500 VIX Mid-Term Futures ETN
VXZ
$31.6M
| $199K | ﹤0.01% |
+3,443
| New | +$220K |
|
4693
Axcelis
ACLS
$3.44B
| $198K | ﹤0.01% |
+1,529
| New | +$211K |
|
4694
PUT
Pampa Energía
PAM
$4.57B
| $198K | ﹤0.01% |
4,000
+3,500
| +700% | +$149K |
|
4695
CALL
F&G Annuities & Life
FG
$3.91B
| $197K | ﹤0.01% |
4,300
+3,800
| +760% | +$142K |
|
4696
PUT
Olema Pharmaceuticals
OLMA
$977M
| $197K | ﹤0.01% |
14,100
+7,000
| +99% | +$94.1K |
|
4697
PUT
Sonos
SONO
$2.09B
| $197K | ﹤0.01% |
11,500
+10,900
| +1,817% | +$147K |
|
4698
CALL
StepStone Group
STEP
$3.54B
| $197K | ﹤0.01% |
+6,200
| New | +$175K |
|
4699
PUT
Webster Financial
WBS
$12.3B
| $197K | ﹤0.01% |
3,900
+700
| +22% | +$30.3K |
|
4700
PUT
Alkermes
ALKS
$8.11B
| $196K | ﹤0.01% |
27,300
+23,900
| +703% | +$621K |
|
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.