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 | |
|---|---|---|---|---|---|---|
3551
PUT
Beam Therapeutics
BEAM
$2.7B
| $628K | ﹤0.01% |
25,900
-62,100
| -71% | -$1.24M |
|
3552
PUT
Danaos Corp
DAC
$2.56B
| $628K | ﹤0.01% |
7,000
+1,600
| +30% | +$147K |
|
3553
Vertex Pharmaceuticals
VRTX
$124B
| $627K | ﹤0.01% |
+1,603
| New | +$670K |
|
3554
CALL
Xometry
XMTR
$4.58B
| $626K | ﹤0.01% |
11,500
+4,200
| +58% | +$182K |
|
3555
Lamb Weston
LW
$7.51B
| $624K | ﹤0.01% |
+10,748
| New | +$587K |
|
3556
Nokia
NOK
$49.9B
| $622K | ﹤0.01% |
+129,361
| New | +$585K |
|
3557
CALL
Getty Images
GETY
$171M
| $621K | ﹤0.01% |
314,100
-18,100
| -5% | -$33.5K |
|
3558
PUT
Structure Therapeutics
GPCR
$3.4B
| $621K | ﹤0.01% |
22,200
-14,400
| -39% | -$287K |
|
3559
Cardlytics
CDLX
$22.3M
| $620K | ﹤0.01% |
25,535
+18,280
| +252% | +$304K |
|
3560
CALL
Triple Flag Precious Metals
TFPM
$5.9B
| $620K | ﹤0.01% |
21,200
+10,200
| +93% | +$264K |
|
3561
CALL
Prothena Corp
PRTA
$448M
| $619K | ﹤0.01% |
63,500
-123,700
| -66% | -$951K |
|
3562
CALL
Portillo's
PTLO
$339M
| $619K | ﹤0.01% |
96,000
-51,000
| -35% | -$430K |
|
3563
CoinShares ETF Trust CoinShares Bitcoin Mining ETF
WGMI
$242M
| $619K | ﹤0.01% |
14,008
+13,981
| +51,781% | +$421K |
|
3564
Melco Resorts & Entertainment
MLCO
$2.19B
| $618K | ﹤0.01% |
67,421
+17,798
| +36% | +$163K |
|
|
SLI
3565
Standard Lithium
SLI
$493M
| $618K | ﹤0.01% |
+183,668
| New | +$513K |
|
3566
Ventas
VTR
$47.7B
| $618K | ﹤0.01% |
8,830
-128
| -1% | -$8.6K |
|
|
HTGCR
3567
PUT
DELISTED
HERCULES TECHNOLOGY GROWTH CAP INC TRANS RGTS TO PUR COM STK
HTGCR
| $618K | ﹤0.01% |
32,700
+13,100
| +67% | +$248K |
|
3568
Cerence
CRNC
$368M
| $617K | ﹤0.01% |
49,519
+19,804
| +67% | +$203K |
|
3569
CALL
Ring Energy
REI
$287M
| $616K | ﹤0.01% |
565,400
+401,900
| +246% | +$364K |
|
3570
Wabtec
WAB
$51.7B
| $616K | ﹤0.01% |
3,074
+2,879
| +1,476% | +$568K |
|
|
3571
Danaos Corp
DAC
$2.56B
| $615K | ﹤0.01% |
+6,848
| New | +$631K |
|
3572
PUT
Nordic American Tanker
NAT
$1.35B
| $615K | ﹤0.01% |
196,000
+11,000
| +6% | +$32.5K |
|
3573
CALL
ZTO Express
ZTO
$18.2B
| $614K | ﹤0.01% |
32,000
+1,100
| +4% | +$21.1K |
|
|
CUK
3574
CALL
DELISTED
Carnival PLC
CUK
| $613K | ﹤0.01% |
23,200
+22,900
| +7,633% | +$631K |
|
3575
CALL
Domo
DOMO
$170M
| $613K | ﹤0.01% |
38,700
+16,400
| +74% | +$254K |
|
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.