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 | |
|---|---|---|---|---|---|---|
5076
YieldMax NVDA Option Income Strategy ETF
NVDY
$1.31B
| $179K | ﹤0.01% |
10,673
-4,713
| -31% | -$79.5K |
|
5077
PUT
Royalty Pharma
RPRX
$26.2B
| $179K | ﹤0.01% |
5,100
-25,600
| -83% | -$927K |
|
5078
PUT
WillScot Mobile Mini Holdings
WSC
$4.35B
| $179K | ﹤0.01% |
8,500
-39,900
| -82% | -$1.03M |
|
|
CCCX
5079
DELISTED
Churchill Capital Corp X
CCCX
| $179K | ﹤0.01% |
+13,961
| New | +$147K |
|
5080
Celcuity
CELC
$4.27B
| $178K | ﹤0.01% |
3,614
-13,028
| -78% | -$521K |
|
5081
CALL
ITT
ITT
$17.3B
| $178K | ﹤0.01% |
1,000
-1,900
| -66% | -$319K |
|
5082
Nu Skin
NUS
$254M
| $178K | ﹤0.01% |
14,649
+1,156
| +9% | +$12.1K |
|
5083
PUT
Stratasys
SSYS
$697M
| $178K | ﹤0.01% |
15,900
-212,500
| -93% | -$2.29M |
|
5084
Equinix
EQIX
$103B
| $177K | ﹤0.01% |
227
+180
| +383% | +$141K |
|
5085
CALL
Rekor Systems
REKR
$84.6M
| $177K | ﹤0.01% |
113,100
-27,100
| -19% | -$34.3K |
|
5086
Triple Flag Precious Metals
TFPM
$6.12B
| $177K | ﹤0.01% |
6,082
+1
| +0% | +$26 |
|
5087
PUT
Atlas Energy Solutions
AESI
$1.29B
| $176K | ﹤0.01% |
15,500
-8,700
| -36% | -$107K |
|
5088
ChargePoint
CHPT
$142M
| $176K | ﹤0.01% |
16,122
-2,009
| -11% | -$23K |
|
5089
Inseego
INSG
$111M
| $176K | ﹤0.01% |
+11,782
| New | +$119K |
|
5090
CALL
Trinity Capital Inc.
TRIN
$1.56B
| $176K | ﹤0.01% |
11,400
-53,000
| -82% | -$821K |
|
5091
PUT
TETRA Technologies
TTI
$1.13B
| $176K | ﹤0.01% |
30,700
+23,700
| +339% | +$101K |
|
5092
PUT
Woodward
WWD
$21.2B
| $176K | ﹤0.01% |
700
| – | – |
|
|
ZK
5093
PUT
DELISTED
Zeekr
ZK
| $176K | ﹤0.01% |
5,800
+500
| +9% | +$14.5K |
|
|
CONI
5094
GraniteShares 2x Short COIN Daily ETF
CONI
$10.8M
| $176K | ﹤0.01% |
4,246
+4,235
| +38,500% | +$198K |
|
5095
AGNC Investment
AGNC
$12.7B
| $175K | ﹤0.01% |
17,970
-407,675
| -96% | -$3.95M |
|
5096
CALL
Cirrus Logic
CRUS
$6.65B
| $175K | ﹤0.01% |
1,400
-800
| -36% | -$89.1K |
|
5097
FormFactor
FORM
$8.21B
| $175K | ﹤0.01% |
+4,823
| New | +$155K |
|
5098
CALL
Griffon
GFF
$4.03B
| $175K | ﹤0.01% |
2,300
+1,100
| +92% | +$84.8K |
|
5099
Icon
ICLR
$12.8B
| $175K | ﹤0.01% |
1,000
+796
| +390% | +$133K |
|
5100
PUT
Lightwave Logic
LWLG
$931M
| $175K | ﹤0.01% |
47,400
+38,500
| +433% | +$99.3K |
|
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.