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 | |
|---|---|---|---|---|---|---|
5626
CALL
Wabash National
WNC
$512M
| $111K | ﹤0.01% |
11,300
+10,200
| +927% | +$109K |
|
5627
YieldMax Universe Fund of Option Income ETFs
YMAX
$389M
| $111K | ﹤0.01% |
8,712
-3,955
| -31% | -$52.2K |
|
|
LENZ
5628
CALL
LENZ Therapeutics
LENZ
$166M
| $111K | ﹤0.01% |
2,400
+500
| +26% | +$18.4K |
|
|
YETH
5629
Roundhill Ether Covered Call Strategy ETF
YETH
$59.1M
| $111K | ﹤0.01% |
4,189
-4,877
| -54% | -$134K |
|
|
GMEU
5630
T-REX 2X Long GME Daily Target ETF
GMEU
$20.9M
| $111K | ﹤0.01% |
6,246
+2,253
| +56% | +$32.4K |
|
5631
PUT
Assured Guaranty
AGO
$3.66B
| $110K | ﹤0.01% |
+1,300
| New | +$108K |
|
5632
CALL
Archrock
AROC
$6.27B
| $110K | ﹤0.01% |
4,200
+300
| +8% | +$7.23K |
|
5633
Avient
AVNT
$3.33B
| $110K | ﹤0.01% |
+3,358
| New | +$117K |
|
5634
CALL
FirstCash
FCFS
$8.85B
| $110K | ﹤0.01% |
+700
| New | +$97.9K |
|
5635
PUT
Gevo
GEVO
$360M
| $110K | ﹤0.01% |
56,400
+36,700
| +186% | +$59.8K |
|
5636
ProShares Ultra Technology
ROM
$1.12B
| $110K | ﹤0.01% |
+1,197
| New | +$98.7K |
|
5637
CALL
Frontier Group Holdings
ULCC
$1.55B
| $110K | ﹤0.01% |
25,000
-64,000
| -72% | -$290K |
|
5638
CALL
Universal Insurance Holdings
UVE
$1.22B
| $110K | ﹤0.01% |
4,200
+2,500
| +147% | +$61.7K |
|
5639
CALL
Babcock & Wilcox
BW
$1.39B
| $109K | ﹤0.01% |
37,900
-12,900
| -25% | -$22.8K |
|
5640
Glaukos
GKOS
$9.83B
| $109K | ﹤0.01% |
1,339
+706
| +112% | +$64.8K |
|
5641
CALL
Navient
NAVI
$789M
| $109K | ﹤0.01% |
8,300
+4,600
| +124% | +$62.5K |
|
5642
NextDecade
NEXT
$1.79B
| $109K | ﹤0.01% |
16,101
-227,733
| -93% | -$2.2M |
|
5643
PUT
Pricesmart
PSMT
$5.98B
| $109K | ﹤0.01% |
900
| – | – |
|
5644
CALL
TTEC Holdings
TTEC
$121M
| $109K | ﹤0.01% |
32,500
+10,300
| +46% | +$42.2K |
|
5645
CALL
Metallus
MTUS
$838M
| $109K | ﹤0.01% |
6,600
+5,400
| +450% | +$88K |
|
5646
PUT
InfraCap MLP ETF
AMZA
$470M
| $108K | ﹤0.01% |
4,900
-3,900
| -44% | -$165K |
|
5647
PUT
Celcuity
CELC
$4.21B
| $108K | ﹤0.01% |
2,200
+1,800
| +450% | +$72K |
|
5648
PUT
Idaho Strategic Resources
IDR
$444M
| $108K | ﹤0.01% |
3,200
+2,300
| +256% | +$54.3K |
|
5649
Nordson
NDSN
$16.6B
| $108K | ﹤0.01% |
480
+253
| +111% | +$55.8K |
|
5650
SEI Investments
SEIC
$12.4B
| $108K | ﹤0.01% |
+1,281
| New | +$114K |
|
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.