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 | |
|---|---|---|---|---|---|---|
676
CALL
GoDaddy
GDDY
$11.8B
| $22M | 0.01% |
207,200
+134,300
| +184% | +$12M |
|
677
CALL
Boston Scientific
BSX
$63.9B
| $21.9M | 0.01% |
378,800
+32,000
| +9% | +$1.71M |
|
678
CALL
McKesson
MCK
$95.3B
| $21.9M | 0.01% |
47,300
+18,900
| +67% | +$8.59M |
|
679
CALL
Chewy
CHWY
$8.81B
| $21.9M | 0.01% |
925,600
-174,800
| -16% | -$3.45M |
|
680
CALL
Halliburton
HAL
$27.6B
| $21.8M | 0.01% |
603,600
-246,100
| -29% | -$9.46M |
|
681
CALL
AB InBev
BUD
$160B
| $21.8M | 0.01% |
337,500
+180,100
| +114% | +$10.6M |
|
682
CALL
GameStop
GME
$9.69B
| $21.8M | 0.01% |
1,242,800
+49,700
| +4% | +$730K |
|
683
CALL
Cadence Design Systems
CDNS
$93B
| $21.8M | 0.01% |
79,900
+31,800
| +66% | +$8.19M |
|
684
CALL
Intercontinental Exchange
ICE
$80.6B
| $21.7M | 0.01% |
168,700
+29,900
| +22% | +$3.39M |
|
685
CALL
Peabody Energy
BTU
$2.91B
| $21.6M | 0.01% |
889,000
+126,600
| +17% | +$3.05M |
|
686
Delta Air Lines
DAL
$54.9B
| $21.5M | 0.01% |
+534,529
| New | +$19.4M |
|
687
CALL
Realty Income
O
$60.6B
| $21.5M | 0.01% |
374,300
+224,400
| +150% | +$11.8M |
|
688
PUT
Tyson Foods
TSN
$20.1B
| $21.4M | 0.01% |
398,700
+96,100
| +32% | +$4.67M |
|
|
SPLK
689
PUT
DELISTED
Splunk Inc
SPLK
| $21.4M | 0.01% |
140,200
-213,100
| -60% | -$31.8M |
|
690
PUT
Agnico Eagle Mines
AEM
$73.5B
| $21.3M | 0.01% |
389,400
+15,800
| +4% | +$790K |
|
691
CALL
Warner Bros
WBD
$64.8B
| $21.3M | 0.01% |
1,875,700
-760,100
| -29% | -$8.2M |
|
692
CALL
C3.ai
AI
$1.27B
| $21.3M | 0.01% |
743,000
-491,100
| -40% | -$13.5M |
|
693
CALL
CarMax
KMX
$8.15B
| $21.3M | 0.01% |
277,400
+40,000
| +17% | +$2.69M |
|
694
CALL
Invesco S&P SmallCap Low Volatility ETF
XSLV
$247M
| $21.3M | 0.01% |
363,600
+189,900
| +109% | +$7.73M |
|
|
695
PUT
Chewy
CHWY
$8.81B
| $21.2M | 0.01% |
897,700
-288,500
| -24% | -$5.69M |
|
696
CALL
Williams Companies
WMB
$91.1B
| $21.2M | 0.01% |
609,000
+175,500
| +40% | +$6.16M |
|
697
CALL
DaVita
DVA
$14.9B
| $21.2M | 0.01% |
202,400
+170,300
| +531% | +$15.7M |
|
698
CALL
W.W. Grainger
GWW
$63.9B
| $21.1M | 0.01% |
25,500
+19,700
| +340% | +$15.2M |
|
699
CALL
Sysco
SYY
$39.3B
| $21.1M | 0.01% |
288,600
+65,900
| +30% | +$4.55M |
|
700
PUT
Logitech
LOGI
$15B
| $21.1M | 0.01% |
221,900
+92,200
| +71% | +$7.57M |
|
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.