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 |
Apple
AAPL
|
+$552M |
| 2 |
Strategy Inc
MSTR
|
+$85.8M |
| 3 |
MSTX
Defiance Daily Target 2x Long MSTR ETF
MSTX
|
+$48.1M |
| 4 |
Intel
INTC
|
+$45.4M |
| 5 |
Uber
UBER
|
+$43M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
NVIDIA
NVDA
|
+$133M |
| 2 |
Pinduoduo
PDD
|
+$82.6M |
| 3 |
Boeing
BA
|
+$49.8M |
| 4 |
KraneShares CSI China Internet ETF
KWEB
|
+$45.1M |
| 5 |
Microsoft
MSFT
|
+$41M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.68% |
| 2 | Consumer Discretionary | 0.23% |
| 3 | Healthcare | 0.19% |
| 4 | Financials | 0.13% |
| 5 | Communication Services | 0.11% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2851
Telephone and Data Systems
TDS
$3.91B
| $987K | ﹤0.01% |
+28,952
| New | +$881K |
|
2852
CALL
Harrow
HROW
$1.43B
| $986K | ﹤0.01% |
29,400
+4,000
| +16% | +$177K |
|
2853
CALL
Republic Services
RSG
$66.7B
| $985K | ﹤0.01% |
4,900
-1,000
| -17% | -$207K |
|
2854
CALL
Conduent
CNDT
$230M
| $983K | ﹤0.01% |
243,500
+238,900
| +5,193% | +$950K |
|
2855
PUT
RingCentral
RNG
$4.05B
| $983K | ﹤0.01% |
28,100
-11,000
| -28% | -$395K |
|
2856
CALL
Arcutis Biotherapeutics
ARQT
$3.42B
| $982K | ﹤0.01% |
70,500
+14,800
| +27% | +$162K |
|
2857
CALL
BorgWarner
BWA
$13.2B
| $982K | ﹤0.01% |
30,900
-8,300
| -21% | -$283K |
|
2858
CALL
H&R Block
HRB
$5.18B
| $982K | ﹤0.01% |
18,600
-16,100
| -46% | -$946K |
|
|
KC
2859
Kingsoft Cloud Holdings
KC
$2.84B
| $981K | ﹤0.01% |
+93,606
| New | +$533K |
|
|
LX
2860
PUT
LexinFintech Holdings
LX
$244M
| $981K | ﹤0.01% |
169,200
+132,400
| +360% | +$556K |
|
2861
CALL
Amprius Technologies
AMPX
$1.31B
| $980K | ﹤0.01% |
350,300
+292,000
| +501% | +$510K |
|
|
GDEN
2862
CALL
DELISTED
Golden Entertainment
GDEN
| $979K | ﹤0.01% |
31,000
-6,200
| -17% | -$197K |
|
2863
PUT
BCE
BCE
$19.9B
| $978K | ﹤0.01% |
42,200
-36,100
| -46% | -$1.04M |
|
2864
GFL Environmental
GFL
$14.3B
| $978K | ﹤0.01% |
21,970
+20,768
| +1,728% | +$904K |
|
|
ESPR
2865
CALL
DELISTED
Esperion Therapeutics
ESPR
| $977K | ﹤0.01% |
444,300
+225,700
| +103% | +$527K |
|
|
DVAX
2866
CALL
DELISTED
Dynavax Technologies
DVAX
| $974K | ﹤0.01% |
76,300
+13,300
| +21% | +$161K |
|
2867
MicroSectors FANG+ ETNs due Jan 8 2038
FNGS
$542M
| $972K | ﹤0.01% |
16,956
+12,656
| +294% | +$680K |
|
2868
PUT
Torrid Holdings
CURV
$247M
| $971K | ﹤0.01% |
185,700
+172,800
| +1,340% | +$695K |
|
2869
CALL
Dorman Products
DORM
$4.01B
| $971K | ﹤0.01% |
7,500
-3,300
| -31% | -$423K |
|
2870
CALL
US Foods
USFD
$21.4B
| $971K | ﹤0.01% |
14,400
-41,100
| -74% | -$2.7M |
|
2871
Ryder
R
$10.3B
| $969K | ﹤0.01% |
+6,181
| New | +$966K |
|
2872
PUT
Equifax
EFX
$20.3B
| $968K | ﹤0.01% |
3,800
+1,800
| +90% | +$482K |
|
2873
Axos Financial
AX
$5.45B
| $967K | ﹤0.01% |
13,858
+11,378
| +459% | +$831K |
|
2874
PUT
Globus Medical
GMED
$10.4B
| $967K | ﹤0.01% |
+11,700
| New | +$923K |
|
2875
CALL
Wave Life Sciences
WVE
$1.12B
| $966K | ﹤0.01% |
78,100
+43,800
| +128% | +$585K |
|
Similar funds
Simplex Trading's Q4 2024 Portfolio in Review
As of Q4 2024, Simplex Trading held 10,008 positions worth $179B, up 4.8% from $170B the previous quarter. Its ten largest holdings account for 49% of the portfolio.
Simplex Trading's Q4 2024 filing shows 1,520 new, 3,222 increased, 3,616 reduced and 1,504 closed positions. Its largest new stake was Strategy Inc: 285,022 shares worth $82.5M. The largest sale was NVIDIA, an estimated $133M.
By sector, the portfolio is most concentrated in Technology at 0.68% of assets, up from 0.4% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q4 2024 buy was Strategy Inc: 285,022 shares worth $82.5M.
- Simplex Trading added most to Apple in Q4 2024, an estimated $552M increase.
- Simplex Trading's biggest Q4 2024 reduction was NVIDIA, cutting an estimated $133M.
- Simplex Trading fully exited Pinduoduo in Q4 2024, selling an estimated $82.6M.
- Simplex Trading's ten largest holdings make up 49% of its $179B portfolio in Q4 2024.
- Simplex Trading opened 1,520 new positions and closed 1,504 in Q4 2024.
- Simplex Trading's portfolio value rose 4.8% quarter-over-quarter to $179B.
Based on Simplex Trading's 13F filing for Q4 2024, filed 11 Feb 2025.