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 | |
|---|---|---|---|---|---|---|
3701
CALL
AdaptHealth
AHCO
$1.53B
| $551K | ﹤0.01% |
61,600
-147,900
| -71% | -$1.37M |
|
|
HELP
3702
CALL
Cybin Inc
HELP
$471M
| $551K | ﹤0.01% |
93,600
+86,600
| +1,237% | +$614K |
|
|
EB
3703
PUT
DELISTED
Eventbrite
EB
| $551K | ﹤0.01% |
218,800
-47,600
| -18% | -$124K |
|
3704
PUT
Amcor
AMCR
$21.6B
| $549K | ﹤0.01% |
13,440
+8,920
| +197% | +$400K |
|
3705
CALL
Atour Lifestyle Holdings
ATAT
$4.77B
| $548K | ﹤0.01% |
14,600
+3,100
| +27% | +$113K |
|
3706
Synchrony
SYF
$25.1B
| $548K | ﹤0.01% |
+7,713
| New | +$559K |
|
3707
PTC Therapeutics
PTCT
$6.25B
| $547K | ﹤0.01% |
+8,926
| New | +$465K |
|
3708
CALL
PubMatic
PUBM
$605M
| $547K | ﹤0.01% |
66,100
+47,200
| +250% | +$481K |
|
3709
PUT
Sonoco
SON
$5.99B
| $547K | ﹤0.01% |
12,700
+11,600
| +1,055% | +$536K |
|
3710
PUT
Ashland
ASH
$3.11B
| $546K | ﹤0.01% |
11,400
-5,700
| -33% | -$300K |
|
3711
CALL
Universal Technical Institute
UTI
$2.15B
| $546K | ﹤0.01% |
16,800
+1,300
| +8% | +$38.2K |
|
|
ETHT
3712
ProShares Ultra Ether ETF
ETHT
$204M
| $546K | ﹤0.01% |
6,073
+1,188
| +24% | +$105K |
|
|
TGEN
3713
CALL
Tecogen Inc
TGEN
$92.7M
| $546K | ﹤0.01% |
+62,000
| New | +$497K |
|
3714
Ferguson
FERG
$45B
| $545K | ﹤0.01% |
2,431
-1,862
| -43% | -$422K |
|
3715
HEICO Corp
HEI
$50.8B
| $545K | ﹤0.01% |
1,689
-1,052
| -38% | -$335K |
|
3716
Apple Hospitality REIT
APLE
$3.97B
| $544K | ﹤0.01% |
45,311
+17,778
| +65% | +$220K |
|
|
BTM
3717
CALL
DELISTED
Bitcoin Depot
BTM
| $544K | ﹤0.01% |
23,171
-5,929
| -20% | -$186K |
|
3718
PUT
Iovance Biotherapeutics
IOVA
$2.1B
| $543K | ﹤0.01% |
250,400
+8,600
| +4% | +$20.3K |
|
3719
CALL
Leggett & Platt
LEG
$1.47B
| $543K | ﹤0.01% |
61,200
-2,100
| -3% | -$20K |
|
3720
PUT
RCI Hospitality Holdings
RICK
$203M
| $543K | ﹤0.01% |
17,800
+17,700
| +17,700% | +$634K |
|
3721
CALL
FT Vest Gold Strategy Target Income ETF
IGLD
$505M
| $542K | ﹤0.01% |
3,200
-12,600
| -80% | -$281K |
|
3722
PUT
Nano X Imaging
NNOX
$61.1M
| $542K | ﹤0.01% |
146,700
-46,300
| -24% | -$206K |
|
3723
CALL
Innoviz Technologies
INVZ
$99.5M
| $541K | ﹤0.01% |
265,600
-165,200
| -38% | -$281K |
|
3724
CALL
MillerKnoll
MLKN
$1.61B
| $541K | ﹤0.01% |
30,500
+30,400
| +30,400% | +$615K |
|
|
KLAR
3725
Klarna Group
KLAR
$7.07B
| $541K | ﹤0.01% |
+14,787
| New | +$633K |
|
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.