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 | |
|---|---|---|---|---|---|---|
951
CALL
GE HealthCare
GEHC
$28.2B
| $10.3M | 0.01% |
137,300
-27,600
| -17% | -$2.06M |
|
952
PUT
Return Stacked Bonds & Managed Futures ETF
RSBT
$137M
| $10.3M | 0.01% |
1,083,500
+313,500
| +41% | +$5.17M |
|
953
PUT
PNC Financial Services
PNC
$99.5B
| $10.3M | 0.01% |
51,100
+22,600
| +79% | +$4.47M |
|
|
GAP
954
PUT
The Gap Inc
GAP
$6.8B
| $10.3M | 0.01% |
479,400
-112,900
| -19% | -$2.44M |
|
|
TYNS
955
CALL
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $10.2M | 0.01% |
58,900
-1,600
| -3% | -$278K |
|
956
CALL
Biogen
BIIB
$29.6B
| $10.2M | 0.01% |
73,000
-7,100
| -9% | -$960K |
|
957
CALL
Plug Power
PLUG
$3.06B
| $10.2M | 0.01% |
4,387,700
+1,357,500
| +45% | +$2.3M |
|
958
CALL
Emerson Electric
EMR
$81.2B
| $10.2M | 0.01% |
77,900
-17,000
| -18% | -$2.32M |
|
959
PUT
Allstate
ALL
$65.5B
| $10.2M | 0.01% |
47,600
-13,000
| -21% | -$2.62M |
|
960
CALL
American International
AIG
$41.4B
| $10.2M | 0.01% |
129,600
-28,500
| -18% | -$2.28M |
|
961
PUT
Realty Income
O
$60.4B
| $10.2M | 0.01% |
167,400
+13,000
| +8% | +$757K |
|
962
PUT
Coupang
CPNG
$28.1B
| $10.2M | 0.01% |
316,000
-72,000
| -19% | -$2.18M |
|
963
CALL
SSR Mining
SSRM
$5.64B
| $10.2M | 0.01% |
416,000
-62,700
| -13% | -$1.06M |
|
964
CALL
Quanta Services
PWR
$98.1B
| $10.2M | 0.01% |
24,500
-23,200
| -49% | -$9.02M |
|
965
CALL
HubSpot
HUBS
$9.73B
| $10.2M | 0.01% |
21,700
+6,000
| +38% | +$3.02M |
|
966
PUT
Ferrari
RACE
$63.2B
| $10.1M | 0.01% |
20,900
-6,100
| -23% | -$2.92M |
|
967
PUT
Akamai
AKAM
$17.1B
| $10.1M | 0.01% |
133,800
+26,400
| +25% | +$2.03M |
|
968
PUT
Pultegroup
PHM
$23.7B
| $10.1M | 0.01% |
76,500
-49,700
| -39% | -$6.17M |
|
969
CALL
AGNC Investment
AGNC
$12.3B
| $10.1M | 0.01% |
1,030,800
+406,400
| +65% | +$3.94M |
|
970
Invesco S&P 500 Equal Weight ETF
RSP
$95.3B
| $10.1M | 0.01% |
53,151
+14,252
| +37% | +$2.66M |
|
971
CALL
Dutch Bros
BROS
$8.78B
| $10M | 0.01% |
191,100
+75,900
| +66% | +$4.8M |
|
972
CALL
Lemonade
LMND
$4.66B
| $9.99M | 0.01% |
186,700
+38,300
| +26% | +$1.87M |
|
973
CALL
Nutrien
NTR
$32.9B
| $9.99M | 0.01% |
170,200
+40,500
| +31% | +$2.36M |
|
974
PUT
CRISPR Therapeutics
CRSP
$4.68B
| $9.97M | 0.01% |
153,900
+55,600
| +57% | +$3.19M |
|
975
CALL
Invesco Aerospace & Defense ETF
PPA
$8.22B
| $9.96M | 0.01% |
56,900
+11,900
| +26% | +$1.75M |
|
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.