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 |
Microsoft
MSFT
|
+$234M |
| 2 |
iShares Russell 2000 ETF
IWM
|
+$97.5M |
| 3 |
Amazon
AMZN
|
+$96.8M |
| 4 |
iShares Bitcoin Trust
IBIT
|
+$80.6M |
| 5 |
Pinduoduo
PDD
|
+$54.9M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$129M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$92.9M |
| 3 |
Broadcom
AVGO
|
+$82.9M |
| 4 |
Alphabet (Google) Class C
GOOG
|
+$68.4M |
| 5 |
Meta Platforms (Facebook)
META
|
+$59.2M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.79% |
| 2 | Consumer Discretionary | 0.3% |
| 3 | Healthcare | 0.25% |
| 4 | Financials | 0.17% |
| 5 | Industrials | 0.09% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
2051
Eaton
ETN
$157B
| $2.62M | ﹤0.01% |
+7,000
| New | +$2.55M |
|
2052
CALL
GeneDx Holdings
WGS
$1.75B
| $2.62M | ﹤0.01% |
24,300
-81,000
| -77% | -$8.82M |
|
2053
CALL
Vermilion Energy
VET
$1.73B
| $2.62M | ﹤0.01% |
334,500
+137,800
| +70% | +$1.06M |
|
2054
CALL
Dave Inc
DAVE
$5.12B
| $2.61M | ﹤0.01% |
13,100
+3,700
| +39% | +$799K |
|
|
CYBR
2055
CALL
DELISTED
CyberArk
CYBR
| $2.61M | ﹤0.01% |
5,400
-20,300
| -79% | -$8.71M |
|
2056
D.R. Horton
DHI
$41B
| $2.61M | ﹤0.01% |
+15,400
| New | +$2.42M |
|
2057
Lemonade
LMND
$4.62B
| $2.61M | ﹤0.01% |
48,755
+19,931
| +69% | +$972K |
|
2058
CALL
Entegris
ENTG
$19.7B
| $2.61M | ﹤0.01% |
28,200
-14,600
| -34% | -$1.24M |
|
2059
CALL
SELLAS Life Sciences
SLS
$2.23B
| $2.6M | ﹤0.01% |
1,617,700
+782,700
| +94% | +$1.39M |
|
2060
Edison International
EIX
$30.7B
| $2.6M | ﹤0.01% |
47,022
+9,535
| +25% | +$514K |
|
2061
PUT
Viking Holdings
VIK
$44.9B
| $2.6M | ﹤0.01% |
41,800
+24,000
| +135% | +$1.43M |
|
2062
PUT
FS KKR Capital
FSK
$2.98B
| $2.6M | ﹤0.01% |
173,900
+69,500
| +67% | +$1.32M |
|
2063
PUT
Redwire
RDW
$2.08B
| $2.6M | ﹤0.01% |
288,800
+113,800
| +65% | +$1.33M |
|
2064
CALL
Freshpet
FRPT
$2.83B
| $2.6M | ﹤0.01% |
47,100
+2,000
| +4% | +$124K |
|
2065
Norwegian Cruise Line
NCLH
$8.89B
| $2.59M | ﹤0.01% |
105,268
-38,534
| -27% | -$936K |
|
|
PR
2066
PUT
Permian Resources
PR
$17.9B
| $2.59M | ﹤0.01% |
202,400
-52,800
| -21% | -$724K |
|
2067
CALL
Forward Air
FWRD
$482M
| $2.59M | ﹤0.01% |
101,000
+45,300
| +81% | +$1.3M |
|
2068
PUT
Prothena Corp
PRTA
$458M
| $2.59M | ﹤0.01% |
265,200
+103,700
| +64% | +$797K |
|
2069
PUT
Cinemark Holdings
CNK
$3.82B
| $2.59M | ﹤0.01% |
92,300
-122,700
| -57% | -$3.39M |
|
2070
CALL
Skyworks Solutions
SWKS
$9.06B
| $2.59M | ﹤0.01% |
33,600
-8,800
| -21% | -$655K |
|
2071
CALL
Fastly Inc
FSLY
$3.17B
| $2.58M | ﹤0.01% |
302,300
+139,200
| +85% | +$1.03M |
|
2072
CALL
TC Energy
TRP
$73.5B
| $2.57M | ﹤0.01% |
47,300
-1,600
| -3% | -$80.3K |
|
2073
PUT
Moody's
MCO
$81.7B
| $2.57M | ﹤0.01% |
5,400
-14,300
| -73% | -$7.21M |
|
2074
CALL
Biohaven
BHVN
$2.16B
| $2.57M | ﹤0.01% |
171,200
-11,000
| -6% | -$160K |
|
2075
PUT
Avantor
AVTR
$7.81B
| $2.56M | ﹤0.01% |
205,400
-155,000
| -43% | -$2M |
|
Similar funds
Simplex Trading's Q3 2025 Portfolio in Review
As of Q3 2025, Simplex Trading held 10,358 positions worth $195B, up 12% from $175B the previous quarter. Its ten largest holdings account for 46% of the portfolio.
Simplex Trading's Q3 2025 filing shows 1,743 new, 3,828 increased, 3,250 reduced and 1,308 closed positions. Its largest new stake was Microsoft: 458,309 shares worth $237M. The largest sale was iShares 20+ Year Treasury Bond ETF, an estimated $129M.
By sector, the portfolio is most concentrated in Technology at 0.79% of assets, up from 0.74% a quarter earlier, followed by Consumer Discretionary and Healthcare.
- Simplex Trading's largest Q3 2025 buy was Microsoft: 458,309 shares worth $237M.
- Simplex Trading added most to iShares Russell 2000 ETF in Q3 2025, an estimated $97.5M increase.
- Simplex Trading's biggest Q3 2025 reduction was Alphabet (Google) Class A, cutting an estimated $92.9M.
- Simplex Trading fully exited iShares 20+ Year Treasury Bond ETF in Q3 2025, selling an estimated $129M.
- Simplex Trading's ten largest holdings make up 46% of its $195B portfolio in Q3 2025.
- Simplex Trading opened 1,743 new positions and closed 1,308 in Q3 2025.
- Simplex Trading's portfolio value rose 12% quarter-over-quarter to $195B.
Based on Simplex Trading's 13F filing for Q3 2025, filed 12 Nov 2025.